QUANTUM CORP /DE/
S-4, 1998-08-18
COMPUTER STORAGE DEVICES
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<PAGE>
 
    AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON AUGUST 18, 1998
                                                      REGISTRATION NO. 333-
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
 
                                ---------------
 
                                    FORM S-4
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933
 
                                ---------------
 
                              QUANTUM CORPORATION
             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)

       DELAWARE                          3572                      94-2665054
(STATE OR OTHER JURISDICTION  (PRIMARY STANDARD INDUSTRIAL     (I.R.S. EMPLOYER
 OF INCORPORATION OR           CLASSIFICATION CODE NO.)          IDENTIFICATION
  ORGANIZATION)                                                      NUMBER)

                           500 MCCARTHY BOULEVARD 
                          MILPITAS, CALIFORNIA 95035
                                (408) 894-4000
 
  (ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER, INCLUDING AREA CODE, OF
                   REGISTRANT'S PRINCIPAL EXECUTIVE OFFICES)
 
                                ---------------
                               RICHARD L. CLEMMER
                           CHIEF FINANCIAL OFFICER
                             QUANTUM CORPORATION
                           500 MCCARTHY BOULEVARD 
                         MILPITAS, CALIFORNIA 95035 
                                (408) 894-4000
 (NAME, ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER, INCLUDING AREA CODE,
                             OF AGENT FOR SERVICE)
 
                                ---------------
 
                                   COPIES TO:
      STEVEN E. BOCHNER, ESQ.                   PATRICK ARRINGTON, ESQ. 
      JEFFREY A. HERBST, ESQ.                   STEVE L. CAMAHORT, ESQ. 
 WILSON SONSINI GOODRICH & ROSATI           BROBECK, PHLEGER & HARRISON LLP  
     PROFESSIONAL CORPORATION                    38 TECHNOLOGY DRIVE 
       650 PAGE MILL ROAD                      IRVINE, CALIFORNIA 92618 
 PALO ALTO, CALIFORNIA 94304-1050                  (949) 790-6300
        (650) 493-9300 
                                ---------------
 
  APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC: As soon as
practicable after the effective date of this Registration Statement and the
satisfaction or waiver of certain conditions to the merger (the "Merger") of
Quick Acquisition Corporation, a wholly-owned subsidiary of Quantum
Corporation, with and into ATL Products, Inc. ("ATL") pursuant to the Agreement
and Plan of Reorganization described herein.
 
  If the securities being registered on this Form are being offered in
connection with the formation of a holding company and there is compliance with
General Instruction G, check the following box. [_]
 
  If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act of 1933, as amended (the
"Securities Act"), check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. [_]
 
  If this Form is a post-effective amendment filed pursuant to Rule 462(d)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. [_]
 
                                ---------------
 
                        CALCULATION OF REGISTRATION FEE
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                                  PROPOSED        PROPOSED
                                  AMOUNT          MAXIMUM          MAXIMUM       AMOUNT OF
  TITLE OF EACH CLASS OF           TO BE       OFFERING PRICE     AGGREGATE     REGISTRATION
SECURITIES TO BE REGISTERED    REGISTERED(1)    PER UNIT(2)   OFFERING PRICE(2)    FEE(3)
- --------------------------------------------------------------------------------------------
<S>                          <C>               <C>            <C>               <C>
 Common Stock, $0.01 par
  value per share(4)....     18,000,000 shares     $26.25       $253,452,491      $74,768
</TABLE>
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
(1) Represents the estimated maximum number of shares of Quantum Common Stock
    which are issuable upon consummation of the Merger, computed based on the
    estimated maximum number of shares of ATL Class A Common Stock (9,655,000)
    and ATL Class B Common Stock (333) that may be converted into shares of
    Quantum Common Stock to be registered.
(2) Pursuant to Rule 457(f)(1) promulgated under the Securities Act, the
    registration fee is based on the market value of the Common Stock of ATL as
    of August 11, 1998, using a per share price of $26.25 (the average of the
    high and low sales prices of ATL Class A Common Stock on such date) and
    9,655,333 shares (the aggregate number of shares of ATL Class A Common
    Stock and Class B Common Stock outstanding on such date).
(3) The amount of the registration fee includes $66,544.75 previously paid
    pursuant to Section 14(g) of the Securities Exchange Act of 1934, as
    amended, in connection with the filing by ATL of a preliminary Proxy
    Statement/Prospectus related to the proposed Merger.
(4) Includes associated Preferred Share Purchase Rights, which initially are
    attached to and trade with the shares of Quantum Common Stock being
    registered hereby. Value attributable to such Preferred Share Purchase
    Rights, if any, is reflected in the market price of Quantum Common Stock.
 
                                ---------------
 
  THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT
SHALL FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION
STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(A) OF
THE SECURITIES ACT OF 1933 OR UNTIL THE REGISTRATION STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID SECTION 8(A),
MAY DETERMINE.
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>
 
                               ATL PRODUCTS, INC
                              2801 KELVIN AVENUE
                           IRVINE, CALIFORNIA 92614
 
                                AUGUST 18, 1998
 
TO: THE STOCKHOLDERS OF ATL PRODUCTS, INC.
 
Dear Stockholder:
 
  You are cordially invited to attend a special meeting of the stockholders of
ATL Products, Inc., a Delaware corporation ("ATL") to be held at 2:00 p.m.
Pacific Time, on September 24, 1998, at the Hyatt Regency Irvine, located at
17900 Jamboree Road, Irvine, California 92614 (the "ATL Special Meeting").
 
  At the ATL Special Meeting you will be asked to consider and vote on the
following proposals:
 
  1. To approve and adopt the Agreement and Plan of Reorganization (the
"Merger Agreement"), dated as of May 18, 1998, by and among Quantum
Corporation, a Delaware corporation ("Quantum"), Quick Acquisition
Corporation, a Delaware corporation and wholly-owned subsidiary of Quantum
("Merger Sub"), and ATL, and to approve the merger (the "Merger") of Merger
Sub with and into ATL pursuant to the Merger Agreement. As a result of the
Merger, ATL will become a wholly owned subsidiary of Quantum and each share of
Class A Common Stock and Class B Common Stock of ATL (collectively, the "ATL
Common Stock") will be converted into and exchanged for that number of shares
of Common Stock of Quantum (the "Quantum Common Stock") equal to the quotient
(the "Exchange Ratio") determined by dividing (i) $29.00 by (ii) the Quantum
Deemed Value (as defined in the attached Proxy Statement/Prospectus and
subject to adjustment).
 
  2. To transact such other business as may properly come before the ATL
Special Meeting or any postponements or adjournments thereof.
 
  NationsBanc Montgomery Securities LLC ("NationsBanc Montgomery"), ATL's
financial advisor, has delivered to the Board of Directors of ATL its written
opinion dated as of May 18, 1998 to the effect that, based upon and subject to
the various considerations set forth in such opinion, as of the date of such
opinion, the Exchange Ratio is fair from a financial point of view to the
holders of ATL Common Stock.
 
  AFTER CAREFUL CONSIDERATION, ATL'S BOARD OF DIRECTORS HAS UNANIMOUSLY
APPROVED THE MERGER AGREEMENT AND HAS DETERMINED THAT THE MERGER IS IN THE
BEST INTERESTS OF ATL AND ITS STOCKHOLDERS. THE BOARD OF DIRECTORS UNANIMOUSLY
RECOMMENDS A VOTE FOR THE APPROVAL AND ADOPTION OF THE MERGER AGREEMENT AND
APPROVAL OF THE MERGER.
 
  Details of the proposed Merger and other important information concerning
Quantum and ATL are more fully described in the accompanying Proxy
Statement/Prospectus. Please review this material carefully.
 
  Whether or not you plan to attend the ATL Special Meeting, please complete,
sign and date the accompanying proxy card and return it in the enclosed
postage prepaid envelope. You may revoke your proxy in the manner described in
the accompanying Proxy Statement/Prospectus at any time before it has been
voted at the ATL Special Meeting. If you attend the ATL Special Meeting, you
may vote in person even if you have previously returned your proxy card. Your
prompt cooperation will be greatly appreciated.
 
                                          Sincerely,
 

                                          /s/ Kevin C. Daly 
                                          Kevin C. Daly, Ph.D.
                                          CHIEF EXECUTIVE OFFICER,
                                          PRESIDENT AND CHAIRMAN
                                          OF THE BOARD
 
           YOUR VOTE IS IMPORTANT--PLEASE RETURN YOUR PROXY PROMPTLY
<PAGE>
 
                              ATL PRODUCTS, INC.
                              2801 KELVIN AVENUE
                           IRVINE, CALIFORNIA 92614
 
                               ----------------
 
                   NOTICE OF SPECIAL MEETING OF STOCKHOLDERS
 
TO: THE STOCKHOLDERS OF ATL PRODUCTS, INC.
 
  NOTICE IS HEREBY GIVEN that a special meeting of the stockholders of ATL
PRODUCTS, INC., a Delaware corporation ("ATL"), will be held at 2:00 p.m.
Pacific Time, on September 24, 1998, at the Hyatt Regency Irvine, located at
17900 Jamboree Road, Irvine, California 92614 (the "ATL Special Meeting"), to
consider and vote upon the following proposals:
 
  1. To approve and adopt the Agreement and Plan of Reorganization (the
"Merger Agreement"), dated as of May 18, 1998, by and among Quantum
Corporation, a Delaware corporation ("Quantum"), Quick Acquisition
Corporation, a Delaware corporation and wholly-owned subsidiary of Quantum
("Merger Sub"), and ATL, and to approve the merger (the "Merger") of Merger
Sub with and into ATL pursuant to the Merger Agreement. As a result of the
Merger, ATL will become a wholly owned subsidiary of Quantum and each share of
Class A Common Stock and Class B Common Stock of ATL (collectively, the "ATL
Common Stock") will be converted into and exchanged for that number of shares
of Common Stock of Quantum (the "Quantum Common Stock") equal to the quotient
(the "Exchange Ratio") determined by dividing (i) $29.00 by (ii) the Quantum
Deemed Value (as defined in the attached Proxy Statement/Prospectus and
subject to adjustment). A copy of the Merger Agreement is attached as Appendix
A to the Proxy Statement/Prospectus accompanying this Notice.
 
  2. To transact such other business as may properly come before the ATL
Special Meeting or any postponements or adjournments thereof.
 
  The Board of Directors has fixed the close of business on August 10, 1998 as
the record date for the determination of the holders of ATL Common Stock
entitled to notice of, and to vote at, the ATL Special Meeting. Accordingly,
only stockholders of record at the close of business on such date are entitled
to notice of and to vote at the ATL Special Meeting and any adjournment or
postponement thereof. The affirmative vote of a majority of the outstanding
shares of ATL Common Stock entitled to vote thereon is necessary for approval
and adoption of the Merger Agreement and approval of the Merger.
 
  Details of the proposed Merger and other important information concerning
Quantum and ATL are more fully described in the accompanying Proxy
Statement/Prospectus. Please review this material carefully.
 
  All stockholders are cordially invited to attend the ATL Special Meeting in
person; however, to ensure your representation at the ATL Special Meeting you
are urged to mark, sign, date and return the enclosed proxy card as promptly
as possible in the postage prepaid envelope enclosed for that purpose.
 
  YOU MAY REVOKE YOUR PROXY IN THE MANNER DESCRIBED IN THE ACCOMPANYING PROXY
STATEMENT/PROSPECTUS AT ANY TIME BEFORE IT HAS BEEN VOTED AT THE SPECIAL
MEETING. ANY STOCKHOLDER ATTENDING THE ATL SPECIAL MEETING MAY VOTE IN PERSON
EVEN IF HE OR SHE HAS RETURNED A PROXY.
 
                                          Sincerely,
 
                                          /s/ Kevin C. Daly 
                                          Kevin C. Daly, Ph.D.
                                          CHIEF EXECUTIVE OFFICER,
                                          PRESIDENT AND CHAIRMAN
                                          OF THE BOARD
 
Irvine, California
August 18, 1998
<PAGE>
 
    QUANTUM CORPORATION                           ATL PRODUCTS, INC.
   500 MCCARTHY BOULEVARD                         2801 KELVIN AVENUE
 MILPITAS, CALIFORNIA 95035                    IRVINE, CALIFORNIA 92614
 
                          PROXY STATEMENT/PROSPECTUS
                                --------------
 
  Quantum Corporation, a Delaware corporation ("Quantum"), and ATL Products,
Inc., a Delaware corporation ("ATL"), have entered into an Agreement and Plan
of Reorganization, dated as of May 18, 1998, (the "Merger Agreement"), among
Quantum, Quick Acquisition Corporation, a Delaware corporation and wholly-
owned subsidiary of Quantum ("Merger Sub"), and ATL. Pursuant to the Merger
Agreement, Merger Sub will merge with and into ATL, ATL will continue as the
surviving corporation and will become a wholly-owned subsidiary of Quantum,
and each outstanding share of Class A Common Stock, $0.0001 par value, and
Class B Common Stock, $0.0001 par value, of ATL (collectively, the "ATL Common
Stock"), will be converted into the right to receive that number of shares of
the Common Stock of Quantum, $0.01 par value per share (the "Quantum Common
Stock"), equal to the quotient (the "Exchange Ratio") determined by dividing
(i) $29.00 by (ii) the Quantum Deemed Value (as defined herein and subject to
adjustment) (all such actions collectively, the "Merger").
 
  This Proxy Statement/Prospectus is being furnished to stockholders of ATL in
connection with the solicitation of proxies by the ATL Board of Directors (the
"ATL Board") for use at a special meeting of ATL stockholders (the "ATL
Special Meeting") to be held on September 24, 1998, at the Hyatt Regency
Irvine, located at 17900 Jamboree Road, Irvine, California 92614, commencing
at 2:00 p.m. Pacific Time, and at any adjournment or postponement thereof, for
the purpose of considering and voting upon the Merger. This Proxy
Statement/Prospectus also constitutes the Prospectus of Quantum with respect
to the Quantum Common Stock to be issued in the Merger in exchange for
outstanding shares of ATL Common Stock.
 
  The consummation of the Merger is subject, among other things, (i) to the
approval and adoption of the Merger Agreement by a majority of the outstanding
shares entitled to vote thereon at the ATL Special Meeting, provided that a
quorum is present and (ii) to the receipt of certain regulatory approvals.
Concurrent with the Merger Agreement, Quantum has entered into a voting
agreement with one ATL stockholder who is deemed to beneficially hold
approximately 1.9% of the outstanding shares of ATL Common Stock, pursuant to
which such stockholder has agreed to vote in favor of the Merger and has
granted the Board of Directors of Quantum an irrevocable proxy and power of
attorney to vote his shares in favor of the merger. SEE "RISK FACTORS"
COMMENCING ON PAGE 11 FOR A DESCRIPTION OF CERTAIN MATTERS THAT SHOULD BE
CONSIDERED BY STOCKHOLDERS BEFORE VOTING. A conformed copy of the Merger
Agreement is attached hereto as Appendix A.
 
  The Quantum Common Stock is listed for trading on the Nasdaq National Market
("Nasdaq") under the symbol "QNTM." It is a condition of the obligations of
Quantum and ATL to the consummation of the Merger that the shares of Quantum
Common Stock to be issued in the Merger be approved for quotation on Nasdaq.
The ATL Class A Common Stock is listed for trading on Nasdaq under the symbol
"ATLPA." The ATL Class B Common Stock is not currently listed on any exchange.
Following consummation of the Merger, ATL Class A Common Stock will be removed
from registration under the Securities Exchange Act of 1934, as amended (the
"Exchange Act"), and will no longer be listed for quotation on Nasdaq. On May
18, 1998, the last full trading day prior to the public announcement of the
execution and delivery of the Merger Agreement, the closing sale prices of the
Quantum Common Stock and ATL Class A Common Stock on Nasdaq were $22.25 per
share and $26.75 per share, respectively. On July 31, 1998, the last
practicable trading day for which information is available before the printing
of this Proxy Statement/Prospectus, the closing sale prices of the Quantum
Common Stock and ATL Class A Common Stock were $17.50 per share and $27.3125
per share, respectively.
 
  NO PERSON HAS BEEN AUTHORIZED TO GIVE ANY INFORMATION OR TO MAKE ANY
REPRESENTATION OTHER THAN THOSE CONTAINED IN THIS PROXY STATEMENT/PROSPECTUS
IN CONNECTION WITH THE SOLICITATION OF PROXIES OR THE OFFERING OF SECURITIES
MADE HEREBY, AND, IF GIVEN, ANY SUCH INFORMATION OR REPRESENTATION MUST NOT BE
RELIED UPON AS HAVING BEEN AUTHORIZED BY QUANTUM, ATL OR ANY OTHER PERSON.
THIS PROXY STATEMENT/PROSPECTUS DOES NOT CONSTITUTE AN OFFER TO SELL OR A
SOLICITATION OF AN OFFER TO BUY ANY SECURITIES OR THE SOLICITATION OF A PROXY,
IN ANY JURISDICTION TO OR FROM ANY PERSON TO WHOM IT IS NOT LAWFUL TO MAKE ANY
SUCH OFFER OR SOLICITATION IN SUCH JURISDICTION. NEITHER THE DELIVERY OF THIS
PROXY STATEMENT/PROSPECTUS NOR ANY DISTRIBUTION OF SECURITIES HEREUNDER SHALL
UNDER ANY CIRCUMSTANCES CREATE ANY IMPLICATION THAT THERE HAS BEEN NO CHANGE
IN THE AFFAIRS OF QUANTUM OR ATL SINCE THE DATE HEREOF, OR THAT INFORMATION
HEREIN IS CORRECT AS OF ANY TIME SUBSEQUENT TO ITS DATE.
 
                                --------------
 
THE  SECURITIES TO BE ISSUED PURSUANT TO THIS PROXY STATEMENT/PROSPECTUS  HAVE
 NOT BEEN  APPROVED OR DISAPPROVED BY THE SECURITIES AND  EXCHANGE COMMISSION
  OR ANY  STATE SECURITIES COMMISSION, NOR  HAS THE COMMISSION OR  ANY STATE
   SECURITIES  COMMISSION PASSED  UPON  THE ACCURACY  OR  ADEQUACY OF  THIS
    PROXY STATEMENT/PROSPECTUS.  ANY REPRESENTATION  TO THE CONTRARY  IS A
     CRIMINAL OFFENSE.
 
                                --------------
 
        THE DATE OF THIS PROXY STATEMENT/PROSPECTUS IS AUGUST 18, 1998.
<PAGE>
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                                            PAGE
                                                                            ----
<S>                                                                         <C>
AVAILABLE INFORMATION......................................................   1
INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE............................   1
TRADEMARKS.................................................................   2
FORWARD-LOOKING STATEMENTS.................................................   2
SUMMARY....................................................................   3
SELECTED FINANCIAL INFORMATION.............................................  10
RISK FACTORS...............................................................  11
  Risks Related to Merger..................................................  11
  Risks Related to Quantum.................................................  13
  Risks Related to ATL.....................................................  19
COMPARATIVE PER SHARE DATA.................................................  24
MARKET PRICE INFORMATION...................................................  25
THE ATL SPECIAL MEETING....................................................  27
  Date, Time, Place and Purpose............................................  27
  Matters to Be Considered at the ATL Special Meeting......................  27
  Record Date; Voting at the ATL Special Meeting; Vote Required............  27
  Abstentions; Broker Non-Votes............................................  27
  Solicitation of Proxies and Expenses.....................................  28
THE MERGER.................................................................  29
  Background of the Merger.................................................  29
  Recommendation of the ATL Board..........................................  31
  Interests of Certain Persons in the Merger...............................  31
  Reasons for the Merger...................................................  33
  Opinion of ATL's Financial Advisor.......................................  34
  Certain Federal Income Tax Considerations................................  38
  Appraisal Rights.........................................................  39
TERMS OF THE MERGER AGREEMENT..............................................  43
  The Merger...............................................................  43
  Effective Time...........................................................  43
  Conversion of Shares in the Merger; Assumption of Options................  43
  Adjustment of Exchange Ratio.............................................  44
  No Fractional Shares.....................................................  44
  Exchange Agent; Procedures For Exchange of Certificates..................  44
  Operations Following the Merger..........................................  46
  Representations and Warranties...........................................  46
  Conduct of Quantum's and ATL's Business Prior to the Merger..............  46
  No Solicitation..........................................................  48
  Conditions to the Merger.................................................  50
  Termination of the Merger Agreement......................................  51
  Break Up Fee.............................................................  52
  Fees and Expenses........................................................  53
  Amendment................................................................  53
  Waiver...................................................................  53
  Related Agreements.......................................................  53
</TABLE>
 
 
                                       i
<PAGE>
 
<TABLE>
<CAPTION>
                                                                          PAGE
                                                                          ----
<S>                                                                       <C>
OTHER RELATED MATTERS....................................................  55
  Regulatory Matters.....................................................  55
  Accounting Treatment...................................................  55
  Nasdaq Listing.........................................................  55
  Resales of Quantum Common Stock........................................  55
COMPARISON OF RIGHTS OF STOCKHOLDERS OF QUANTUM AND ATL..................  56
CERTAIN INFORMATION CONCERNING QUANTUM...................................  59
CERTAIN INFORMATION CONCERNING ATL.......................................  60
ATL BUSINESS.............................................................  60
ATL MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND
 RESULTS OF OPERATIONS...................................................  67
ATL MANAGEMENT...........................................................  75
  Directors and Executive Officers.......................................  75
  Compensation of Directors..............................................  76
  Board Meetings and Committees..........................................  77
  Section 16(a) Beneficial Ownership Reporting Compliance................  77
ATL EXECUTIVE COMPENSATION...............................................  78
  Summary Compensation Table.............................................  78
  Aggregated Options Exercised in Last Fiscal Year and Fiscal Year-End
   Option Values.........................................................  79
  Employment Contracts, Termination of Employment and Change in Control
   Arrangements..........................................................  79
  Indemnification Of Directors And Officers..............................  79
  1997 Stock Incentive Plan..............................................  80
SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT OF ATL....  82
CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS OF ATL....................  83
DESCRIPTION OF ATL CAPITAL STOCK.........................................  85
LEGAL MATTERS............................................................  86
EXPERTS..................................................................  87
INDEX TO ATL CONSOLIDATED AND COMBINED FINANCIAL STATEMENTS.............. F-1
APPENDICES
 APPENDIX A--AGREEMENT AND PLAN OF REORGANIZATION........................ A-1
 APPENDIX B--OPINION OF NATIONSBANC MONTGOMERY SECURITIES LLC............ B-1
 APPENDIX C--SECTION 262 OF DELAWARE GENERAL CORPORATION LAW............. C-1
</TABLE>
 
                                       ii
<PAGE>
 
                             AVAILABLE INFORMATION
 
  Quantum and ATL are subject to the information reporting requirements of the
Exchange Act, and in accordance therewith file reports, proxy statements and
other information with the Securities and Exchange Commission (the "SEC").
Such reports, proxy statements and other information may be inspected and
copied at the public reference facilities maintained by the SEC at Room 1024,
Judiciary Plaza, 450 Fifth Street, N.W., Washington, D.C. 20549, and at the
SEC's regional offices located at Seven World Trade Center, Suite 1300, New
York, New York 10048, and at Northwestern Atrium Center, 500 West Madison
Street, Suite 1400, Chicago, Illinois 60611-2511. Copies of such material may
be obtained by mail from the Public Reference Section of the SEC at Judiciary
Plaza, 450 Fifth Street, N.W., Washington, D.C. 20549, at prescribed rates.
The SEC also maintains a Web site that contains reports, proxy and information
statements and other information regarding registrants that file
electronically with the SEC at http://www.sec.gov. After the consummation of
the Merger, ATL will no longer file reports, proxy statements or other
information with the SEC. Instead, such information will be provided, to the
extent required, in filings made by Quantum.
 
  Under the rules and regulations of the SEC, the solicitation of proxies from
stockholders of ATL to approve and adopt the Merger Agreement and to approve
the Merger constitutes an offering of Quantum Common Stock to be issued in
connection with the Merger. Accordingly, Quantum has filed with the SEC a
registration statement on Form S-4 (herein, together with all amendments and
exhibits, referred to as the "Registration Statement") under the Securities
Act of 1933, as amended (the "Securities Act"). This Proxy
Statement/Prospectus does not contain all of the information set forth in the
Registration Statement, certain parts of which are omitted in accordance with
the rules and regulations of the SEC. For further information, reference is
hereby made to the Registration Statement and the exhibits thereto. Copies of
the Registration Statement and the exhibits and schedules thereto may be
inspected, without charge, at the offices of the SEC or through the
Commission's Electronic Data Gathering and Retrieval System ("EDGAR") at
http://www.sec.gov, or obtained at prescribed rates from the Public Reference
Section of the SEC at Judiciary Plaza, 450 Fifth Street, N.W., Washington,
D.C. 20549.
 
  All information contained or incorporated by reference in this Proxy
Statement/Prospectus relating to Quantum and Merger Sub has been supplied by
Quantum and all such information relating to ATL has been supplied by ATL.
 
                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE
 
  The following documents previously filed with the SEC by Quantum (File No.
000-12390) pursuant to the Exchange Act are incorporated by reference in this
Proxy Statement/Prospectus:
 
  1. Quantum's Annual Report on Form 10-K for the fiscal year ended March 31,
1998;
 
  2. Quantum's Quarterly Report on Form 10-Q for the quarter ended June 28,
1998;
 
  3. The description of Quantum's Common Stock set forth in Quantum's
Registration Statement on Form 8-A filed with the SEC on August 1, 1983, and
any amendment or report filed for the purpose of updating any such
description; and
 
  4. Quantum's Registration Statement on Form 8-A filed with the SEC on August
4, 1998, relating to Quantum's Preferred Share Purchase Rights, and any
amendment or report filed for the purpose of updating any such description.
 
  All documents and reports subsequently filed by Quantum pursuant to Section
13(a), 13(c), 14 or 15(d) of the Exchange Act after the date of this Proxy
Statement/Prospectus prior to the date of the ATL Special Meeting shall be
deemed to be incorporated by reference in this Proxy Statement/Prospectus and
to be part hereof from the dates of filing of such documents and reports. Any
statement contained in a document incorporated or deemed to be incorporated by
reference herein shall be deemed to be modified or superseded for purposes
hereof to the

<PAGE>
 
extent that a statement contained herein (or in any other subsequently filed
document that is or is deemed to be incorporated by reference herein) modifies
or supersedes such previous statement. Any statement so modified or superseded
shall not be deemed to constitute a part hereof except as so modified or
superseded.
 
  THIS PROXY STATEMENT/PROSPECTUS INCORPORATES DOCUMENTS BY REFERENCE WHICH
ARE NOT PRESENTED HEREIN OR DELIVERED HEREWITH. THESE DOCUMENTS (OTHER THAN
EXHIBITS TO SUCH DOCUMENTS, UNLESS SUCH EXHIBITS ARE SPECIFICALLY INCORPORATED
BY REFERENCE HEREIN) ARE AVAILABLE, WITHOUT CHARGE, UPON ORAL OR WRITTEN
REQUEST BY ANY PERSON TO WHOM THIS PROXY STATEMENT/PROSPECTUS HAS BEEN
DELIVERED, IN THE CASE OF DOCUMENTS RELATING TO QUANTUM, FROM QUANTUM
CORPORATION, 500 MCCARTHY BOULEVARD, MILPITAS, CALIFORNIA 95035, ATTENTION:
INVESTOR RELATIONS; TELEPHONE NUMBER: (408) 894-4000, AND IN THE CASE OF
DOCUMENTS RELATING TO ATL, FROM ATL PRODUCTS, INC., 2801 KELVIN AVENUE,
IRVINE, CALIFORNIA 92614, ATTENTION: SECRETARY; TELEPHONE NUMBER: (714) 774-
6900. IN ORDER TO ENSURE TIMELY DELIVERY OF THE DOCUMENTS PRIOR TO THE ATL
SPECIAL MEETING, ANY SUCH REQUEST SHOULD BE MADE BY SEPTEMBER 17, 1998.
 
                                  TRADEMARKS
 
  This Proxy Statement/Prospectus contains trademarks of Quantum (including
AIRLOCK(R), Defect Free Interface(R), Quantum(R), the Quantum logo,
WriteCache(R), AT-Bus Cable Select(TM), ASABET(TM), Atlas(TM), Bigfoot(TM),
Capacity for the Extraordinary(R), DLT(TM), DLTStor(R), DLTtape(TM),
Fireball(R), Pioneer(TM), Quantum Fireball(TM), Quantum Trailblazer(TM),
Quantum Viking(R), Rushmore(TM), Sirocco(TM) and SPR(TM)) and ATL (including
P1000(TM), Series 520(TM), StorLink(TM), IntelliGrip(TM), Data Storm(TM),
Prism(TM), ATL 2/28(TM), ATL 4/52(TM), ATL 520(TM), ATL 6/176(TM), ATL
9/88(TM), ATL 2640(TM), ATL 7100(TM)) and may contain trademarks of others.
 
                          FORWARD-LOOKING STATEMENTS
 
  THIS PROXY STATEMENT/PROSPECTUS INCLUDES FORWARD-LOOKING STATEMENTS WITHIN
THE MEANING OF SECTION 27A OF THE SECURITIES ACT AND SECTION 21E OF THE
EXCHANGE ACT, WHICH CAN BE IDENTIFIED BY THE USE OF FORWARD-LOOKING
TERMINOLOGY, SUCH AS "MAY," "WILL," "EXPECT," "ANTICIPATE," "ESTIMATE,"
"PROJECT," "CONTINUE," "POTENTIAL" OR "OPPORTUNITY" OR THE NEGATIVE THEREOF OR
OTHER VARIATIONS THEREON OR COMPARABLE TERMINOLOGY. SUCH STATEMENTS INCLUDE,
BUT ARE NOT LIMITED TO, STATEMENTS AS TO THE BENEFITS EXPECTED TO RESULT FROM
THE MERGER, THE FUTURE PERFORMANCE OF THE SURVIVING CORPORATION, THE EXPECTED
PRODUCT INTRODUCTION DATES, PLANNED RESEARCH AND DEVELOPMENT, AND OTHER
STATEMENTS CONTAINED IN "RISK FACTORS," "REASONS FOR THE MERGER" AND "ATL
BUSINESS." THE MATTERS SET FORTH UNDER THE CAPTION "RISK FACTORS" IN THIS
PROXY STATEMENT/PROSPECTUS, WHICH ATL STOCKHOLDERS SHOULD CAREFULLY REVIEW,
CONSTITUTE CAUTIONARY STATEMENTS IDENTIFYING IMPORTANT FACTORS WITH RESPECT TO
SUCH FORWARD-LOOKING STATEMENTS, INCLUDING CERTAIN RISKS AND UNCERTAINTIES
THAT COULD CAUSE ACTUAL RESULTS TO DIFFER MATERIALLY FROM THOSE ANTICIPATED IN
SUCH FORWARD-LOOKING STATEMENTS.
 
  As used herein, unless the context otherwise clearly indicates "Quantum"
refers to Quantum Corporation and its consolidated subsidiaries and "ATL"
refers to ATL Products, Inc. and its consolidated subsidiaries. Capitalized
terms not defined in this Proxy Statement/Prospectus have the respective
meanings specified in the Merger Agreement.
 
                                       2
<PAGE>
 
                                    SUMMARY
 
  The following is a summary of certain information contained elsewhere in this
Proxy Statement/Prospectus. This summary does not contain a complete
description of the Merger Agreement, a copy of which is attached hereto as
Appendix A. Reference is made to, and this summary is qualified in its entirety
by, the more detailed information contained in this Proxy Statement/Prospectus
and the Appendices hereto. Unless otherwise defined herein, capitalized terms
used in this summary have the respective meanings ascribed to them elsewhere in
this Proxy Statement/Prospectus. Stockholders of ATL are urged to read
carefully this Proxy Statement/Prospectus and the Annexes in their entirety.
 
INTRODUCTION
 
  This Proxy Statement/Prospectus is furnished in connection with the
solicitation by the ATL Board of proxies from holders of ATL Common Stock for
use at the ATL Special Meeting. At the ATL Special Meeting, the holders of ATL
Common Stock will be asked to approve and adopt the Merger Agreement by and
among Quantum, ATL and Merger Sub and to approve the Merger. As a result of the
Merger, ATL will become a wholly-owned subsidiary of Quantum.
 
THE COMPANIES
 
  Quantum Corporation. Quantum designs, develops and markets information
storage products, including high-performance, high quality half-inch cartridge
tape drives, tape media, tape autoloaders and libraries, hard disk drives and
solid state disk drives. The half-inch cartridge tape drives and solid state
disk drives are manufactured by Quantum. Quantum combines its engineering and
design expertise with the high-volume manufacturing capabilities of its
exclusive manufacturing partner, Matsushita-Kotobuki Electronics Industries,
Ltd. ("MKE") of Japan, a subsidiary of Matsushita Electric Industrial Co.,
Ltd., to produce high-quality hard disk drives. MKE manufactures all of
Quantum's hard disk drives. Quantum was incorporated as a California
corporation in February 1980, and reincorporated as a Delaware corporation in
April 1987. Quantum's principal executive offices are located at 500 McCarthy
Boulevard, Milpitas, California 95035, and its telephone number at that
location is (408) 894-4000.
 
  ATL Products, Inc. ATL designs, manufactures, markets and services automated
magnetic tape libraries used to manage, store and transfer data in networked
computing environments. ATL is a leading provider of Digital Linear Tape
("DLT") automated tape libraries for the high end of the networked computing
market (one terabyte capacity and above). ATL was established in 1990 as a
division of Odetics, Inc., a Delaware corporation ("Odetics"), was incorporated
in California in February 1993 as a wholly-owned subsidiary of Odetics and was
reincorporated in Delaware in December 1996. In October 1997, Odetics completed
a tax-free distribution of its remaining interest in ATL by payment of a
dividend of its ATL Class A Common Stock to Odetics' stockholders. ATL's
executive offices are located at 2801 Kelvin Avenue, Irvine, California 92614,
and its telephone number at that location is (949) 477-7800.
 
  Quick Acquisition Corporation. Merger Sub is a newly-formed, wholly-owned
Delaware subsidiary of Quantum formed solely for the purpose of the Merger.
Merger Sub has no material assets or liabilities and has not engaged in any
material operations since its incorporation. Merger Sub's principal executive
offices are located at Quantum, 500 McCarthy Boulevard, Milpitas, California
95035. Merger Sub's telephone number at that location is (408) 894-4000.
 
ATL SPECIAL MEETING
 
  Date, Time, Place and Purpose. The ATL Special Meeting will be held at the
Hyatt Regency Irvine located at 17900 Jamboree Road, Irvine, California 92614
on September 24, 1998 at 2:00 p.m., Pacific Time. The purpose of the ATL
Special Meeting is to consider and vote upon a proposal to approve and adopt
the
 
                                       3
<PAGE>
 
Merger Agreement and to approve the Merger. See "THE ATL SPECIAL MEETING--Date,
Time, Place and Purpose."
 
  Stockholders Entitled to Vote. The close of business on August 10, 1998 is
the record date for determination of holders of ATL Common Stock entitled to
vote at the ATL Special Meeting. At that date, 9,655,000 shares of ATL Class A
Common Stock were outstanding, held by approximately 736 holders of record, and
333 shares of ATL Class B Common Stock were outstanding held by one holder of
record. As of such date, directors and executive officers of ATL and their
affiliates may be deemed to be the beneficial owners of shares of ATL Common
Stock representing approximately 10.6% of the outstanding voting power of ATL.
See "THE ATL SPECIAL MEETING--Record Date; Voting at the Special Meeting; Vote
Required."
 
  The directors and executive officers of ATL have indicated that they intend
to vote the shares of ATL Common Stock held by them for approval and adoption
of the Merger Agreement and approval of the Merger.
 
  Vote Required. Approval and adoption of the Merger Agreement and approval of
the Merger will require the affirmative vote of the holders of a majority of
the outstanding shares of ATL Common Stock entitled to vote thereon. See "THE
ATL SPECIAL MEETING--Record Date; Voting at the Special Meeting; Vote
Required."
 
APPRAISAL RIGHTS
 
  Both Quantum and ATL are incorporated in the State of Delaware, and,
accordingly, are governed by the provisions of the Delaware General Corporation
Law ("DGCL"). Pursuant to Section 262(b) of the DGCL, the holders of ATL Class
A Common Stock are not entitled to appraisal rights in connection with the
Merger because ATL Class A Common Stock is designated as a national market
system security on an interdealer quotations system by the National Association
of Securities Dealers, Inc. (the "NASD"). Accordingly, holders of ATL Class A
Common stock who do not wish to receive Quantum Common Stock in exchange for
their shares of ATL Class A Common Stock must liquidate their investment by
selling their shares prior to the consummation of the Merger. Because the ATL
Class B Common Stock is not listed on a national securities exchange or
designated as a national market system security on an interdealer quotations
system by the NASD, holders of ATL Class B Common Stock are entitled to
appraisal rights in connection with the Merger. Subject to compliance with the
procedures set forth in Section 262 of the DGCL, holders of ATL Class B Common
Stock may be entitled to receive the fair value (exclusive of any element of
value arising from the accomplishment or expectation of the Merger) of such
holder's shares of ATL Class B Common Stock. See "THE MERGER--Appraisal Rights"
and Appendix C hereto.
 
SURRENDER OF CERTIFICATES
 
  If the Merger becomes effective, Quantum will mail a letter of transmittal
with instructions to all holders of record of ATL Common Stock as of the
Effective Time for use in surrendering their stock certificates in exchange for
certificates representing Quantum Common Stock and a cash payment in lieu of
fractional shares. CERTIFICATES SHOULD NOT BE SURRENDERED UNTIL THE LETTER OF
TRANSMITTAL IS RECEIVED.
 
INTERESTS OF CERTAIN PERSONS IN THE MERGER
 
  In considering the recommendation of the ATL Board with respect to the Merger
Agreement and the Merger, holders of ATL Common Stock should be aware that
certain directors and executive officers of the ATL have certain interests in
the Merger that are in addition to the interests of holders of ATL Common Stock
generally. See "THE MERGER--Interests of Certain Persons in the Merger."
 
                                       4
<PAGE>
 
 
ATL BOARD RECOMMENDATION; FAIRNESS OPINION
 
  THE BOARD OF DIRECTORS OF ATL HAS APPROVED THE MERGER AND THE MERGER
AGREEMENT AND RECOMMENDS THAT THE HOLDERS OF ATL COMMON STOCK VOTE FOR THE
APPROVAL AND ADOPTION OF THE MERGER AGREEMENT AND APPROVAL OF THE MERGER.
NATIONSBANC MONTGOMERY SECURITIES LLC ("NATIONSBANC MONTGOMERY"), ATL'S
FINANCIAL ADVISOR, HAS DELIVERED TO THE ATL BOARD ITS WRITTEN OPINION DATED AS
OF MAY 18, 1998 TO THE EFFECT THAT, BASED UPON AND SUBJECT TO THE VARIOUS
CONSIDERATIONS SET FORTH IN SUCH OPINION, AS OF THE DATE OF SUCH OPINION, THE
EXCHANGE RATIO IS FAIR FROM A FINANCIAL POINT OF VIEW TO THE HOLDERS OF ATL
COMMON STOCK.
 
  Copies of the opinion of NationsBanc Montgomery, which set forth the
assumptions made, procedures followed, matters considered and scope of review,
are attached to this Proxy Statement/Prospectus as Appendix B and should be
read carefully in its entirety. See "THE MERGER--Opinion of ATL's Financial
Advisor," which contains a discussion of the fees to be paid to NationsBanc
Montgomery and the conditions under which such fees are payable. Certain
portions of the fees to be paid to NationsBanc Montgomery are contingent upon
consummation of the Merger.
 
QUANTUM'S REASONS FOR THE MERGER
 
  The Board of Directors of Quantum has approved the Merger Agreement and has
identified several potential benefits of the Merger that they believe will
contribute to the success of the combined companies. These potential benefits
include the opportunity to (i) combine Quantum's autoloader products with ATL's
tape library products to offer one of the industry's most comprehensive lines
of tape automation products and (ii) leverage the combined marketing, product
development and distribution capabilities of the two companies. For these and
other reasons, Quantum believes that the Merger will help it to enhance its
market position with respect to a broad range of storage devices. See "THE
MERGER--Background of the Merger" and "--Reasons for the Merger."
 
ATL'S REASONS FOR THE MERGER
 
  The ATL Board believes that the Merger with Quantum will be beneficial to ATL
stockholders for the following reasons: (i) the combination of Quantum's and
ATL's tape automation systems businesses would allow the combined company to
offer one of the broadest and most comprehensive tape automation product line
in the industry; (ii) the integration of highly complementary technical
resources and personnel would enable the combined company to leverage sales,
marketing, product development, distribution and support efforts; and (iii)
combination with Quantum would create a combined company with significantly
greater resources, a more diversified product line and greater financial and
marketing resources than those of ATL alone, and would enhance the competitive
position of the combined company. The ATL Board also considered the probable
adverse impact on ATL's prospects as an independent company in light of
Quantum's expressed intention to enter the high performance automated tape
library business, either by acquisition or internal development. Even though
the ATL Board believes that its automated tape library business is media
independent and that its products could be modified to incorporate tape drive
components other than the DLT drives manufactured exclusively by Quantum, the
ATL Board believed that some degree of uncertainty existed concerning that
product strategy, particularly when redesign and modification would be
conducted under potentially adverse circumstances, such as potentially reduced
access to Quantum's DLT drives, and with Quantum as a possible new competitor,
either directly or by virtue of Quantum's acquisition of one of ATL's existing
competitors. Against these considerations the ATL Board weighed, among other
things, the fact that the Exchange Ratio offered a premium to ATL stockholders
and, because the consideration was stock in the continuing enterprise combining
ATL and Quantum, that ATL's stockholders will have the opportunity to benefit,
on a tax deferred basis, from any growth to be
 
                                       5
<PAGE>
 
achieved by such combination, and participation in the execution of Quantum's
strategy to build an integrated storage systems enterprise.
 
  A more complete description of the primary factors considered and relied upon
by the ATL Board in reaching its recommendation are referred to in "THE
MERGER--Background of the Merger," "--Interests of Certain Persons in the
Merger" and "--Reasons for the Merger."
 
RISK FACTORS
 
  See "RISK FACTORS" for a discussion of certain factors that should be
considered pertaining to the Merger and the combined businesses of Quantum and
ATL.
 
CERTAIN FEDERAL INCOME TAX CONSIDERATIONS
 
  The Merger is intended to qualify as a reorganization under Section 368(a) of
the Internal Revenue Code of 1986, as amended (the "Code"). Assuming the Merger
so qualifies, no gain or loss generally should be recognized by the holders of
shares of ATL Common Stock on the exchange of their shares of ATL Common Stock
solely for shares of Quantum Common Stock. As a condition to the consummation
of the Merger, each of Quantum and ATL will have received an opinion from its
respective tax counsel to the effect that the Merger will constitute a
reorganization under Section 368(a) of the Code. However, all ATL stockholders
are urged to consult their own tax advisors regarding the tax consequences of
the Merger. See "THE MERGER--Certain Federal Income Tax Considerations."
 
REGULATORY MATTERS
 
  Consummation of the Merger is subject to compliance with the Hart-Scott-
Rodino Antitrust Improvement Act of 1976, as amended (the "HSR Act"). On June
15, 1998, Quantum and ATL filed the notifications required under the HSR Act,
as well as certain information required to be furnished to the Federal Trade
Commission (the "FTC") and the Antitrust Division of the Department of Justice
(the "Antitrust Division"). The waiting period applicable to the Merger under
the HSR Act expired on July 15, 1998. The Merger is also subject to
satisfaction of the requirements of federal securities laws and applicable
securities and "blue sky" laws of the various states.
 
ACCOUNTING TREATMENT
 
  The Merger is intended to qualify as a purchase for financial reporting
purposes in accordance with generally accepted accounting principles. See
"OTHER RELATED MATTERS--Accounting Treatment."
 
THE MERGER
 
  Terms of the Merger; Exchange Ratio. At the Effective Time (as defined below)
of the Merger and subject to and upon the terms and conditions of the Merger
Agreement, Merger Sub will merge with and into ATL and ATL will become a
wholly-owned subsidiary of Quantum. Once the Merger is consummated, Merger Sub
will cease to exist as a corporation and all of the business, assets,
liabilities and obligations of Merger Sub will be merged with and into ATL with
ATL remaining as the surviving corporation (ATL as the surviving corporation
after the Merger is hereinafter sometimes referred to as the "Surviving
Corporation"). As a result of the Merger, each outstanding share of ATL Common
Stock, other than shares owned by Merger Sub, Quantum or any wholly-owned
subsidiary of Quantum, will be converted into the right to receive that number
of shares of Quantum Common Stock equal to the quotient determined by dividing
(i) $29.00 by (ii) the Quantum Deemed Value (as defined herein and subject to
adjustment), and each outstanding option to purchase ATL Common Stock under
ATL's stock option plans (each, an "ATL Stock Option") will be assumed by
Quantum (each, an "Assumed Option") and will become an option to purchase that
number of shares of Quantum Common Stock
 
                                       6
<PAGE>
 
as is equal (subject to rounding) to the number of shares of ATL Common Stock
that were subject to such option immediately prior to the Merger, multiplied by
the Exchange Ratio. The exercise price of each Assumed Option will be equal to
the quotient determined by dividing the exercise price per share of ATL Common
Stock at which such Assumed Option was exercisable immediately prior to the
effective time of the Merger by the Exchange Ratio, rounded up to the nearest
whole cent.
 
  Effective Time of the Merger. The Merger will become effective upon the
filing of a Certificate of Merger (the "Certificate of Merger") with the
Secretary of State of the State of Delaware or at such later time as may be
agreed in writing by Quantum and ATL and specified in the Certificate of Merger
(the "Effective Time"). Assuming all conditions to the Merger are met or waived
prior thereto, it is anticipated that the Closing Date of the Merger (the
"Closing Date") and Effective Time will be on or about September 30, 1998. See
"TERMS OF THE MERGER AGREEMENT--Effective Time."
 
  Exchange of ATL Stock Certificates; Assumption of ATL Stock Options. Promptly
after the Effective Time, Quantum, acting through Harris Trust Company of
California as its exchange agent (the "Exchange Agent"), will deliver to each
ATL stockholder of record a letter of transmittal with instructions to be used
by such stockholder in surrendering certificates which, prior to the Merger,
represented shares of ATL Common Stock. CERTIFICATES SHOULD NOT BE SURRENDERED
BY THE HOLDERS OF ATL COMMON STOCK UNTIL SUCH HOLDERS RECEIVE THE LETTER OF
TRANSMITTAL FROM THE EXCHANGE AGENT. At the Effective Time, each outstanding
ATL Stock Option will be assumed by Quantum as described above. OPTION
AGREEMENTS NEED NOT BE SURRENDERED. See "TERMS OF THE MERGER AGREEMENT--
Conversion of Shares in the Merger, Assumption of Options."
 
  Form S-8 Registration Statement. Within five days after the Effective Date,
Quantum will file a registration statement on Form S-8 under the Securities Act
with the SEC covering the shares of Quantum Common Stock issuable with respect
to the Assumed Options.
 
  Stock Ownership Following the Merger. Based upon the number of shares of ATL
Common Stock outstanding as of July 31, 1998 and the closing price of Quantum
Common Stock on July 31, 1998, an aggregate of approximately 16,000,266 shares
of Quantum Common Stock will be issued to ATL stockholders in the Merger, and
Quantum will assume all ATL Stock Options in exchange for options to purchase
up to approximately 1,773,834 additional shares of Quantum Common Stock. Based
upon the number of shares of Quantum Common Stock issued and outstanding as of
July 20, 1998, and after giving effect to the issuance of Quantum Common Stock
as described in the previous sentence, the ATL Common Stock outstanding
immediately prior to the Merger would be converted into, and have voting power
with respect to, approximately 10.6% of Quantum's total issued and outstanding
shares, and the holders of Assumed Options would hold options exercisable for
less than 1.2% of Quantum's total issued and outstanding shares (assuming the
exercise of only such Assumed Options). The foregoing numbers of shares and
percentages are subject to change in the event that the capitalization of
either Quantum or ATL changes subsequent to July 31, 1998 and prior to the
Effective Time and in the event that the public trading price of Quantum Common
Stock changes prior to the Effective Time. There can be no assurance as to the
trading price of Quantum Common Stock during the pricing period or the actual
number of outstanding shares of capital stock of Quantum or ATL at the
Effective Time or of Quantum at any time following the Effective Time.
 
  Conduct of Business Prior to the Merger. Pursuant to the Merger Agreement,
until the earlier of the termination of the Merger Agreement pursuant to its
terms or the Effective Time, ATL has agreed, except (i) as indicated in the
disclosure schedule delivered by ATL to Quantum in connection with the Merger
Agreement or (ii) to the extent that Quantum shall otherwise consent in
writing, to conduct its business in the usual, regular and ordinary course, in
substantially the same manner as previously conducted and in compliance with
all applicable laws and regulations, to pay its debts and taxes when due
subject to good faith disputes over such debts or taxes, to pay or perform
other material obligations when due, and use its commercially reasonable
efforts
 
                                       7
<PAGE>
 
consistent with past practices and policies to preserve intact its present
business organization, keep available the services of its present officers and
employees and preserve its relationships with customers, suppliers,
distributors, licensors, licensees and others with which it has business
dealings. ATL has agreed to promptly notify Quantum of any material event
involving its business or operations. Furthermore, except as provided in its
disclosure schedules, ATL has agreed that it will not, without the prior
written consent of Quantum, perform or engage in certain activities in the
conduct of its business and the business of its subsidiaries. Quantum has
agreed that, among other things, it will not, without the prior consent of ATL,
perform or engage in certain activities in the conduct of its business and the
business of its subsidiaries. See "TERMS OF THE MERGER AGREEMENT--Conduct of
ATL's and Quantum's Business Prior to the Merger."
 
  No Solicitation. Under the terms of the Merger Agreement, ATL has agreed that
it will not engage in certain activities relating to, or which could result in,
an acquisition proposal from a third party. See "TERMS OF THE MERGER
AGREEMENT--No Solicitation."
 
  Termination; Fees. The Merger Agreement may be terminated by either party
under certain circumstances. ATL has agreed that if the Merger is not
consummated as a result of certain specified events, it will pay to Quantum a
termination fee of $6.0 million. See "TERMS OF THE MERGER AGREEMENT--
Termination of the Merger Agreement" and "--Break Up Fee."
 
  Conditions to the Merger. Consummation of the Merger is subject to certain
conditions, including: (i) certain approvals by the stockholders of ATL in
connection with the Merger; (ii) declaration by the SEC of the effectiveness of
the Registration Statement; (iii) absence of any law or order prohibiting
consummation of the Merger; (iv) receipt by Quantum and ATL of opinions of
their respective tax counsel that the Merger will constitute a reorganization
within the meaning of Section 368(a) of the Code; (v) approval for listing on
Nasdaq of the shares of Quantum Common Stock to be issued to ATL stockholders
pursuant to the Merger; (vi) the continued accuracy in all material respects of
the representations and warranties given by each party in the Merger Agreement
except as does not constitute a Material Adverse Effect (as defined in the
Merger Agreement) with regard to such party; (vii) performance in all material
respects of all covenants required by the Merger Agreement; (viii) the absence
of a material adverse change or event with regard to either Quantum or ATL; and
(ix) receipt by ATL of certain consents, waivers or approvals from third
parties as set forth in the disclosure schedules of ATL. See "TERMS OF THE
MERGER AGREEMENT--Conditions to the Merger."
 
RELATED AGREEMENTS
 
  Affiliate Agreements. ATL has agreed to use its best efforts to ensure that
each affiliate of ATL will have entered into an agreement restricting sales,
dispositions or other transactions reducing their risk of investment in respect
of the shares of ATL Common Stock held by him or her prior to the Merger and
the shares of Quantum Common Stock received by him in the Merger so as to
comply with the requirements of applicable federal securities laws. See "TERMS
OF THE MERGER AGREEMENT--Related Agreements."
 
  Voting Agreement.  Kevin C. Daly, Ph.D., ATL's Chief Executive Officer,
President and Chairman of the Board, has entered into an irrevocable Voting
Agreement, pursuant to which Dr. Daly has agreed, among other things, to vote
all shares of ATL Common Stock of which he has beneficial ownership or acquires
beneficial ownership prior to the termination of the Voting Agreement (i) in
favor of approval and adoption of the Merger Agreement and approval of the
Merger and (ii) against approval of any proposal made in opposition to or in
competition with the consummation of the Merger or certain actions which may
impede, delay, discourage or adversely affect the Merger and the transactions
contemplated thereby. In addition, Dr. Daly has granted an irrevocable proxy to
the Quantum Board of Directors to vote his shares in favor of approval of the
Merger Agreement and the Merger. See "TERMS OF THE MERGER AGREEMENT--Related
Agreements."
 
                                       8
<PAGE>
 
 
  Noncompetition Agreements. As a condition to the consummation of the Merger,
eight employees of ATL, including Dr. Daly, must enter into Noncompetition
Agreements with Quantum providing that, for the period of the shorter of (i)
thirty-six (36) months from the Effective Time and (ii) twelve (12) months
after the termination of any employment arrangement with Quantum or any
subsidiary after the Closing Date, such employee will not, directly or
indirectly, engage or invest in, own, manage, operate, finance, control or
participate in the ownership, management, operation, financing or control of,
be employed by, associated with, or in any manner connected with, lend his name
or any similar name to, lend his credit to, or render services or advice to,
any business whose products, product development, services or other activities
compete in any respect with the products, product development, services or
other activities of or offered by ATL, as such existed at or before the
Effective Date; provided, however, that nothing in the Noncompetition
Agreements shall prevent any such employee from owning as a passive investment
less than 3% of the outstanding shares of the capital stock of any publicly-
held company if such shares are actively traded on an established national
securities market in the United States. See "TERMS OF THE MERGER AGREEMENT--
Related Agreements."
 
MARKET AND PRICE DATA
 
  The Quantum Common Stock is traded on Nasdaq under the symbol "QNTM." On May
18, 1998, the last trading day before public announcement of the execution of
the Merger Agreement, the closing price of Quantum Common Stock as reported on
Nasdaq was $22.25 per share. On July 31, 1998, the closing price of Quantum
Common Stock as reported on Nasdaq was $17.50 per share. There can be no
assurance as to the actual price of Quantum Common Stock prior to, at or at any
time following the Effective Time of the Merger, or in the event the Merger is
not consummated.
 
  There is no established trading market for the ATL Class B Common Stock. The
ATL Class A Common Stock is traded on Nasdaq under the symbol "ATLPA." On May
18, 1998, the last trading day before public announcement of the execution of
the Merger Agreement, the closing price of ATL Class A Common Stock as reported
on Nasdaq was $26.75 per share. On July 31, 1998, the closing price of ATL
Class A Common Stock as reported on Nasdaq was $27.3125 per share. There can be
no assurance as to the actual price of ATL Class A Common Stock prior to, or at
the Effective Time of the Merger, or in the event the Merger is not
consummated. Following the Merger, ATL Class A Common Stock will no longer be
traded on Nasdaq. See "RISK FACTORS."
 
                                       9
<PAGE>
 
                         SELECTED FINANCIAL INFORMATION
 
  The following selected historical financial information of Quantum and ATL
has been derived from their respective consolidated historical financial
statements and should be read in conjunction with such consolidated financial
statements and notes thereto. The selected financial information for Quantum
set forth in the table below for each of the five years in the period ended
March 31, 1998 and for the quarter ended June 28, 1998 has been derived from,
and is qualified by reference to, the audited and unaudited, respectively,
consolidated financial statements and notes thereto previously filed with the
Securities and Exchange Commission (Quantum's Annual Report on Form 10-K for
the fiscal year ended March 31, 1998 and its Quarterly Report on Form 10-Q for
the quarter ended June 28, 1998 are incorporated by reference in this Proxy
Statement/Prospectus). The audited consolidated and combined financial
statements and notes thereto for each of the fiscal years ended March 31, 1997
and 1998 and the unaudited consolidated and combined financial statements and
notes thereto of ATL for the quarter ended June 30, 1998 are filed herewith.
 
              QUANTUM SELECTED CONSOLIDATED FINANCIAL INFORMATION
                    (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
 
<TABLE>
<CAPTION>
                                     FISCAL YEAR ENDED MARCH 31,(/1/)              QUARTER ENDED(/1/)
                          ------------------------------------------------------- ---------------------
                                                                                   JUNE 29,   JUNE 28,
                             1994    1995(/2/)  1996(/3/)      1997    1998(/4/)     1997       1998
                          ---------- ---------- ----------  ---------- ---------- ---------- ----------
<S>                       <C>        <C>        <C>         <C>        <C>        <C>        <C>        <C>
INCOME STATEMENT DATA:
 Sales..................  $2,131,054 $3,367,984 $4,422,726  $5,319,457 $5,805,235 $1,446,144 $1,103,023
 Research and develop-
  ment expense..........      89,837    169,282    239,116     291,332    321,741     74,029     84,298
 Net income (loss)......       2,674     81,591    (90,456)    148,515    170,801     96,514      3,010
 Net income (loss) per
  share(/5/)
 Basic..................         .03        .90       (.87)       1.27       1.25        .74        .02
 Diluted................         .03        .76       (.87)       1.04       1.07        .61        .02

BALANCE SHEET DATA:
 Property, plant and
  equipment, net........  $   85,874 $  280,099 $  364,111  $  407,206 $  285,159              $  287,445
 Total assets...........     997,438  1,481,028  1,975,355   2,158,263  2,438,411              2,153,016
 Total long-term debt
  and redeemable pre-
  ferred stock..........     212,500    327,500    598,158     422,906    327,485                327,238
 Return on average
  stockholders' equity..        0.7%      17.7%    (17.2)%       20.8%      15.1%                  0.2%
</TABLE>
 
          ATL SELECTED CONSOLIDATED AND COMBINED FINANCIAL INFORMATION
                    (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
 
<TABLE>
<CAPTION>
                               FISCAL YEAR ENDED MARCH 31,             QUARTER ENDED
                         ------------------------------------------- -----------------
                                                                     JUNE 30, JUNE 30,
                          1994     1995      1996     1997    1998     1997     1998
                         -------  -------  --------  ------- ------- -------- --------
<S>                      <C>      <C>      <C>       <C>     <C>     <C>      <C>
INCOME STATEMENT DATA:
 Net sales.............. $20,506  $22,641  $ 29,410  $60,028 $97,627 $18,567  $32,989
 Net income (loss) .....  (1,895)  (7,515)   (1,189)   3,931   8,370   1,761    2,658
 Diluted earnings (loss)
  per share(/5/)........    (.24)    (.94)     (.15)     .48     .83     .12      .19
 Shares used in per
  share computa-
  tions(/5/)............   8,005    8,005     8,005    8,158   9,765   9,655   10,258

BALANCE SHEET DATA:
 Working capital........ $(2,875) $(9,990) $(11,313) $15,894 $21,121          $29,044
 Total assets...........  13,195   11,253    16,748   37,925  55,029           57,490
 Total long term debt
  (less current por-
  tion).................     --       --        --     9,748   9,582           15,637
 Stockholders' equity
  (deficit) ............  (1,548)  (8,838)  (10,113)   8,865  16,957           18,856
</TABLE>
- --------
(1) No cash dividends were paid for the years or quarters presented.
(2) On October 13, 1994, Quantum acquired portions of Digital Equipment
    Corporation's business. The acquisition is not reflected in the financial
    statements prior to fiscal year 1995, thus the results for fiscal year 1995
    are not comparable to the results prior to fiscal year 1995.
(3) Quantum's results of operations for fiscal year 1996 include the effect of
    a $209 million charge related to the transition of manufacturing of
    Quantum's high-capacity products to MKE. See Note 12 of Notes to Quantum's
    Consolidated Financial Statements.
(4) Quantum's results of operations for fiscal year 1998 include the effect of
    a $103 million special charge related to Quantum's high-end hard disk drive
    products.
(5) Net income (loss) per share amounts have been calculated and, where
    necessary, restated in accordance with Statement of Financial Accounting
    Standards No. 128, "Earnings per Share."
 
 
                                       10
<PAGE>
 
                                 RISK FACTORS
 
  The following factors should be considered carefully by holders of ATL
Common Stock in evaluating whether to approve and adopt the Merger Agreement
and to approve the Merger. These factors should be considered in conjunction
with the other information included or incorporated by reference in this Proxy
Statement/Prospectus. The matters set forth below constitute cautionary
statements identifying important factors with respect to such forward-looking
statements, including certain risks and uncertainties, that could cause actual
results to differ materially from those in such forward-looking statements.
See "FORWARD-LOOKING STATEMENTS."
 
RISKS RELATED TO MERGER
 
  Difficulties of Integrating Two Companies. The successful combination of
Quantum and ATL will require substantial attention from management. The
anticipated benefits of the Merger will not be achieved unless the operations
of ATL are successfully combined with those of Quantum in a timely manner. The
difficulties of assimilation may be increased by the need to integrate
personnel and to combine different corporate cultures, and by Quantum's and
ATL's limited personnel, management and other resources. The successful
combination of the two companies will also require integration of the
companies' product offerings and the coordination of their research and
development and sales and marketing efforts. In addition, the process of
combining the two organizations could cause the interruption of, or a loss of
momentum in, the activities of either or both of the companies' businesses and
could lead certain customers to defer purchasing decisions. The diversion of
the attention of management from the day-to-day operations of Quantum or ATL,
or difficulties encountered in the transition and integration process, could
have a material adverse effect on the business, financial condition and
results of operations of Quantum or ATL.
 
  Risks Associated with Floating Exchange Ratio. As a result of the Merger,
each outstanding share of ATL Common Stock other than shares owned by Merger
Sub, Quantum or any wholly-owned subsidiary of Quantum, will be converted into
the right to receive that number of shares of Quantum Common Stock equal to
the quotient determined by dividing (i) $29.00 by (ii) the Quantum Deemed
Value (subject to adjustment), and each Assumed Option will become an option
to purchase that number of shares of Quantum Common Stock as is equal (subject
to rounding) to the number of shares of ATL Common Stock that were subject to
such option immediately prior to the Merger, multiplied by the Exchange Ratio.
Because the Exchange Ratio is not fixed, it will increase or decrease due to
fluctuations in the market price of Quantum Common Stock up to and including
the fourth trading day prior to the ATL Special Meeting. The specific number
of shares of Quantum Common Stock to be received by ATL stockholders in the
Merger will, therefore, depend on the market price of Quantum Common Stock
during the pricing period prior to the Effective Time. In the event that the
market price of Quantum Common Stock decreases or increases prior to the
Effective Time, the number of shares of Quantum Common Stock to be received by
ATL stockholders in the Merger would correspondingly increase or decrease. The
market prices of Quantum Common Stock and ATL Common Stock as of a recent date
are set forth herein. ATL stockholders are advised to obtain recent market
quotations for Quantum Common Stock and ATL Class A Common Stock. Quantum
Common Stock and ATL Class A Common Stock historically have been subject to
substantial price volatility. No assurance can be given as to the ultimate
Exchange Ratio at the Effective Time.
 
  Tax Risks Associated With the Merger. The Merger Agreement provides that
Merger Sub will be merged with and into ATL, and ATL will be the surviving
corporation and a wholly-owned subsidiary of Quantum. Although the parties
intend the Merger to constitute a tax-free reorganization, neither Quantum nor
ATL has sought or obtained a ruling from the Internal Revenue Service (the
"IRS"). There is therefore a risk that all the gain or loss realized by an ATL
stockholder as a result of the Merger will be subject to tax. However, even if
the Merger does not constitute a tax-free reorganization, neither Quantum nor
its stockholders, as such, will realize taxable income or loss in the Merger.
See "THE MERGER-- Certain Federal Income Tax Considerations."
 
  In addition, on account of the Merger or otherwise, the IRS may assert that
the spin-off of ATL from Odetics in October 1997 (see "CERTAIN RELATIONSHIPS
AND RELATED TRANSACTIONS OF ATL")
 
                                      11
<PAGE>
 
was a taxable transaction. For example, under recently enacted Section 355(e)
of the Code, if the spin-off were considered part of a plan (or series of
related transactions) in which a 50% or greater interest in ATL was acquired
by one or more persons after the spin-off, the IRS would assess a tax on the
spin-off to the extent of the excess of the then fair market value of the
distributed ATL stock over its tax basis. Under the Code, there is a
rebuttable presumption that any acquisition of a spun-off corporation within
two years after a spin-off is pursuant to a proscribed "plan." Counsel for
Quantum and ATL have rendered no opinion as to whether the Merger will be
deemed to have occurred pursuant to such a "plan." If the IRS were successful
in challenging the tax-free nature of the spin-off, ATL could be liable for
the resulting tax as a result of its prior affiliation with Odetics. In
addition, state and local income and franchise taxes could result for which
ATL could similarly be liable. See "THE MERGER--Background of the Merger" and
"--Certain Federal Income Tax Considerations" and "CERTAIN RELATIONSHIPS AND
RELATED TRANSACTIONS OF ATL."
 
  Substantial Expenses Resulting from the Merger. The negotiation and
implementation of the Merger will result in significant pre-tax expenses to
Quantum and ATL, primarily consisting of fees for investment bankers,
attorneys, accountants, financial printing and other related charges. There
can be no assurance as to the aggregate amount of such expenses or that
unanticipated contingencies will not occur that will substantially increase
the costs of combining the operations of the two companies. In any event,
costs associated with the Merger are expected to negatively impact results of
operations in the quarter ended June 30, 1998 and possibly the quarter ending
September 30, 1998.
 
  Dependence on Retention and Integration of Key Employees. The success of
Quantum and ATL after the Merger is dependent, in part, on the retention and
integration of key management, technical, marketing, sales and customer
support personnel of ATL, in particular its President and Chief Executive
Officer, Kevin C. Daly, Ph.D. ATL has entered into separation arrangements
with Dr. Daly and certain other members of senior management. Quantum and ATL
believe that the success of the Merger will depend, in part, upon the
retention of these executives during the transitional period following the
Merger. There can be no assurance that such executives will remain with
Quantum prior to or for any specified period after the Merger. Quantum's
success following the Merger will also depend in large part upon its ability
to attract, retain and motivate highly skilled employees. Competition for such
employees, particularly development engineers and experienced senior
management, is intense, and there can be no assurance that Quantum will be
able to continue to attract and retain sufficient numbers of such highly
skilled employees. Quantum's inability to attract and retain additional key
employees or the loss of one or more of its current key employees could have a
material adverse effect upon Quantum's business, financial condition and
results of operations following the Merger. See "TERMS OF THE MERGER--
Interests of Certain Persons in the Merger."
 
  Conflicts of Interest. In considering the recommendation to adopt and
approve the Merger by the ATL Board, the stockholders of ATL should be aware
that certain officers and directors of ATL may be deemed to have conflicts of
interest with respect to the Merger; such interests, together with other
relevant factors, were considered by the ATL Board in recommending the Merger
to the stockholders of ATL and approving the Merger Agreement. See "THE
MERGER--Interests of Certain Persons in the Merger."
 
  Necessity of Receiving Governmental Approvals Prior to the Merger. The
consummation of the Merger is subject to compliance with the HSR Act. On June
15, 1998, Quantum and ATL filed the notifications required under the HSR Act.
The waiting period applicable to the Merger under the HSR Act expired on July
15, 1998. The Merger is also subject to the satisfaction of the requirements
of Federal Securities laws and the applicable securities and "blue sky" laws
of the various states. See "OTHER RELATED MATTERS--Regulatory Matters."
 
                                      12
<PAGE>
 
RISKS RELATED TO QUANTUM
 
  Intensely Competitive Industry. To compete within the information storage
industry, Quantum frequently introduces new products and transitions to newer
versions of existing products. Product introductions and transitions are
significant to the operating results of Quantum, and if they are not
successful, Quantum is materially adversely affected. The hard disk drive
market, in particular, also tends to experience periods of excess product
inventory and intense price competition. If price competition intensifies,
Quantum may be forced to lower prices more than expected and transition
products sooner than expected, which can materially adversely affect Quantum.
For example, in the first quarter of fiscal year 1999 and the second half of
fiscal year 1998, excess inventory in the desktop hard disk drive market,
aggressive pricing and corresponding margin reduction adversely impacted
Quantum's operating results during the periods. As a result of these
conditions, Quantum had diminished profitability, at near breakeven, in the
first quarter of fiscal year 1999 and the fourth quarter of fiscal year 1998.
Furthermore, losses in the third quarter of fiscal year 1998 were largely
attributable to a $103 million special charge primarily for inventory write-
offs and firm inventory purchase commitments. If competition and aggressive
pricing further intensifies, Quantum's operating results could be further
adversely affected.
 
  Another competitive risk is that Quantum's customers could commence the
manufacture of disk and tape drives for their own use or for sale to others.
Any such loss of customers could have a material adverse effect on Quantum.
 
  Quantum faces direct competition from a number of companies, including
Exabyte, Fujitsu, Hewlett Packard, IBM, Maxtor, Seagate, Sony and Western
Digital. In the event that Quantum is unable to compete effectively with these
companies, any other company, or any collaboration of companies, Quantum would
be materially adversely affected. Quantum's information storage product
competition can be further broken down as follows:
 
    Specialty Storage Products. In the market for tape drives, Quantum
  competes with other companies that have tape drive product offerings and
  alternative formats, including Exabyte, Hewlett-Packard, Sony and Storage
  Technology. In addition, Hewlett-Packard, IBM and Seagate formed a
  consortium to develop two tape drive products, one of which targets high
  capacity data storage. Quantum targets and has the market leadership
  position in the storage product market that provides mission critical
  backup systems, archiving, and disaster recovery for mid-range servers.
  Quantum has achieved market leadership and competes in this segment based
  on the reliability, data integrity, performance, capacity and scalability
  of its tape drives. Although Quantum has experienced excellent market
  acceptance and conditions for its tape drive products, the market would
  become more competitive if other companies individually or collaboratively
  broaden their product lines in this market. As a result, Quantum could
  experience increased price and performance competition. If price or
  performance competition increases, Quantum could be required to lower
  prices, resulting in decreased margins that could materially adversely
  affect Quantum's operating results.
 
    Hard Disk Drive Products. In the market for desktop products, Quantum
  competes primarily with Fujitsu, IBM, Maxtor, Seagate, Samsung and Western
  Digital. Quantum and its competitors have developed and continue to develop
  a number of products targeted at particular segments of this market, such
  as business users and home PC buyers, and factors such as time-to-market,
  cost, product performance, quality and reliability have a significant
  effect on the success of any particular product. The desktop market is
  characterized by more competitiveness and shorter product life cycles than
  the information storage industry in general. This competitiveness, which
  intensified in the second half of fiscal year 1998 and continued in the
  first quarter of fiscal year 1999, has resulted in a significant downward
  trend in gross profit margins on desktop disk drive products during these
  periods.
 
    Quantum faces competition in the high-end hard disk drive market
  primarily from Fujitsu, Hitachi, IBM, and Seagate. Seagate and IBM have the
  largest share of the market for high-end hard disk drives. Although the
  same competitive factors identified above as being generally applicable to
  the overall disk drive industry apply to high-end disk drives, Quantum
  believes that performance, quality and reliability are
 
                                      13
<PAGE>
 
  even more important to the users of high-end products than to users in the
  desktop market. However, this does not lessen the intensely competitive
  nature of the high-end of the hard disk drive market. For example, intense
  competition has led to the trend of losses on Quantum's high-end hard disk
  drive products over the past four quarters, although with decreased losses
  in the first quarter of fiscal year 1999. Quantum does not anticipate that
  the high-end hard disk drive products will return to profitability without
  substantial high-volume shipping of these products with less rapid price
  erosion. However, there can be no assurance as to the profitability of
  these products. Quantum's gross margins on its high-end products during the
  foreseeable future are dependent on the successful development, timely
  introduction, market acceptance and product transition of new products, as
  to which there can be no positive assurance.
 
  Rapid Technological Change, New Product Development and Qualification. In
the hard disk drive market, the combination of an environment of increasingly
rapid technological changes, short product life cycles and intense competitive
pressures results in rapidly decreasing gross margins on specific products.
Accordingly, any delay in the introduction of more advanced and more cost-
effective products can result in significantly lower sales and gross margins.
Quantum's future is therefore dependent on its ability to anticipate what
customers will demand and to develop the new products that meet this demand
and effectively compete with the products of competitors.
 
  For example, magnetoresistive ("MR") recording heads represent an important
technology and component related to the performance and competitiveness of
Quantum's products. In particular, MR recording heads have been important to
achieving competitive storage density for the Company's products. The
anticipated next generation of MR recording heads is referred to as Giant MR
("GMR") recording heads. Quantum expects industry-wide time to market
competition in calendar year 1999 using GMR technology to have an impact on
technology leadership and competitiveness. In this regard, the recent alliance
between IBM and Western Digital that includes a purchasing agreement and
technology licensing involving GMR recording heads is expected to increase the
competition in GMR recording head time-to-market. Quantum can make no
assurance regarding its ability to incorporate GMR recording heads into its
products and, if successful, the competitiveness of Quantum's products.
Quantum's future is also dependent on its ability to qualify new products with
customers, to successfully introduce these products to the market on a timely
basis, and to commence and achieve volume production that meets customer
demand. Because of these factors, Quantum expects sales of new products to
continue to account for a significant portion of its future hard disk drive
sales and that sales of older products will decline rapidly.
 
  Quantum is frequently in the process of qualifying new products with its
customers. The customer qualification process for disk drive products,
particularly high-capacity products, can be lengthy, complex, and difficult.
Quantum would be materially adversely affected if it were unable to achieve
customer qualifications for new products in a timely manner, or at all, or if
MKE were unable to continue to manufacture qualified products in volume with
consistent high quality. See "--Dependence on MKE Relationship."
 
  In the mid-range tape drive market, Quantum has experienced less rapid
technological change, as well as less technology and performance based
competition as compared with the hard disk drive market. This has resulted in
favorable gross margins on sales of Quantum's DLTtape brand products. Higher
margins on DLTtape products, as compared with the eroded gross margins on hard
disk drives, have resulted in tape drive and related media products becoming
the primary source of Quantum's operating income in the first quarter of
fiscal year 1999 and the second half of fiscal year 1998. Given the favorable
tape drive market conditions that Quantum has experienced, competitors are
aggressively trying to make technological advances and take other steps in
order to more successfully compete with Quantum's DLTtape products. Successful
competitor product offerings, which target the market in which Quantum's
DLTtape products compete, could have a material adverse effect on Quantum. In
addition, ,in the event that Quantum is not able to maintain DLTtape
technology competitiveness based on its performance, quality, reliability and
scalability or otherwise not meet the requirements of the market, it could
lose market share and experience declining sales and gross margins which would
have a material adverse effect on Quantum.
 
                                      14
<PAGE>
 
  In the information storage industry in general, there can be no assurance
that Quantum will be successful in the development and marketing of any new
products and components in response to technological change or evolving
industry standards, or that Quantum will not experience difficulties that
could delay or prevent the successful development, introduction and marketing
of these products and components, or that Quantum's new products and
components will adequately meet the requirements of the marketplace or achieve
market acceptance. These significant risks apply to all new products,
including those expected to be based on optical and Super DLTtape technology.
In addition, technological advances in magnetic, optical or other
technologies, or the development of new technologies, could result in the
introduction of competitive products with superior performance and
substantially lower prices than Quantum's products. Furthermore, Quantum's new
products and components are subject to significant technological risks. If
Quantum experiences delays in the commencement of commercial shipments of new
products or components, Quantum could experience delays or loss of product
sales. If, for technological or other reasons, Quantum is unable to develop
and introduce new products in a timely manner in response to changing market
conditions or customer requirements, Quantum would be materially adversely
affected.
 
  Quantum owns 49% of MKE-Quantum Components LLC ("MKQC"), a joint venture
with MKE, that researches, develops, and manufactures magnetoresistive
recording heads for computer disk drives. Quantum uses these recording heads
in its disk drive products. As part of Quantum's strategy to remain
technologically competitive, Quantum has invested in technologies, such as in
optical technology through its strategic alliance with and investment in
TeraStor Corporation and its investment in MR recording heads through the MKQC
joint venture. There can be no assurance that the technologies, companies and
ventures in which Quantum has invested will be profitable in the information
storage industry. Adverse technological or operating outcomes could result in
impairment and write-down of associated investments which could have a
material adverse effect on Quantum.
 
  Customer Concentration. In addition to the concentration of the information
storage industry and Quantum's customer base, the customers are generally not
obligated to purchase any minimum volume of Quantum's products, and Quantum's
relationships with its customers are generally terminable at will. In June
1998, two Quantum customers, Compaq Computer, Inc. and Digital Equipment
Corporation merged, thereby increasing the Company's customer concentration
and associated risk.
 
  Sales of Quantum's desktop and tape products, which together comprise a
majority of its overall sales, were concentrated with several key customers in
the first quarter of fiscal year 1999 and in fiscal year 1998. Sales to
Quantum's top five customers in the first quarter of fiscal year 1999 and
fiscal year 1998 represented 44% of sales (percentage of sales reflects a
retroactive combination of the sales to Compaq Computer, Inc. and Digital
Equipment Corporation as a result of their merger in June 1998). Because of
the rapid and unpredictable changes in market conditions, and the short
product life cycles for its customers' products, Quantum is unable to predict
whether there will be any significant change in demand for any of its
customers' products in the future. In the event that any such changes result
in decreased demand for Quantum's products, whether by loss of or delays in
orders, Quantum could be materially adversely affected. In addition, the loss
of one or more key customers could materially adversely affect Quantum.
 
  Fluctuation in Product Demand. Fluctuation in demand for Quantum's products
results in fluctuations in operating results. Demand for the computer systems
in which Quantum's storage products are used have historically been subject to
significant fluctuations. Such fluctuations in end-user demand have in the
past, and may in the future, result in the deferral or cancellation of orders
for Quantum's products, either of which could have a material adverse effect
on Quantum. During the past several years, there has been significant growth
in the demand for PCs, a portion of which represented sales of PCs for use in
the home. However, many analysts predict that future growth will be at a
slower rate than the rate experienced in recent years.
 
  Sales of DLTtape drives and media have tended to be more stable and were a
significant component of sales for Quantum. In addition, Quantum has
experienced longer product cycles for its tape drives and tape drive-related
products compared with the short product cycles of disk drive products.
However, there can be no assurance that this trend will continue. Beginning in
the third quarter of fiscal year 1998, sales of tape drives and
 
                                      15
<PAGE>
 
media achieved gross margins that significantly exceeded gross margins from
the sale of Quantum's hard drive products. In this regard Quantum expects
sales of DLTtape products, which represented 23% of its sales and the only
profitable major product family in the first quarter of fiscal year 1999, and
21% of sales and a majority of operating profits in fiscal year 1998, will
continue to represent a major portion of Quantum's operating profits in the
future. Quantum expects the rate of sales growth to lessen in fiscal year 1999
compared with the rate of growth achieved in fiscal year 1998. However, there
can be no assurance that any growth expectations will be achieved or that
current market conditions will continue.
 
  Quantum's shipments tend to be highest in the third month of each quarter.
Failure by Quantum to complete shipments in the final month of a quarter
resulting from a decline in customer demand, manufacturing problems or other
factors would adversely affect Quantum's operating results for that quarter.
 
  Because Quantum has no long-term purchase commitments from its customers,
future demand is difficult to predict. Quantum could experience decreases in
demand for any of its products in the future, which could have a material
adverse effect on Quantum.
 
  Intellectual Property Matters. From time to time, Quantum is approached by
companies and individuals alleging Quantum's infringement of and need for a
license under patented or proprietary third party technology that Quantum
assertedly uses. On August 7, 1998, Quantum was named as one of several
defendants in a patent infringement lawsuit filed in the U.S. District Court
for the Northern District of Illinois, Eastern Division. The plaintiff, Papst
Licensing GmbH, owns at least 24 U.S. patents which it asserts that Quantum
has infringed. Quantum has studied many of these patents and analyzed Papst's
claims of infringement and, with respect to the patents it has studied,
Quantum believes that defenses of patent invalidity and non-infringement can
be made. However, Quantum has not had sufficient time to conduct a complete
study of all the patents cited by Papst and there can be no assurance that
Quantum has not infringed these or other patents owned by Papst. If required,
there can be no assurance that licenses to any technology owned by Papst or by
any other third party alleging infringement could be obtained on commercially
reasonable terms or at all. Adverse resolution of the Papst litigation or any
other intellectual property litigation could subject Quantum to substantial
liabilities and require it to refrain from manufacturing certain products
which would have a material adverse effect on Quantum's business, financial
condition or results of operations. In addition, the costs of engaging in the
Papst litigation or other intellectual property litigation could be
substantial, regardless of the outcome.
 
  Inventory Risk. Quantum's customers generally are not obligated to purchase
any minimum volume of Quantum's products and fluctuations in end-user demand
may result in the deferral or cancellation of orders for Quantum's products.
These risk factors, when combined with the OEM trend toward carrying minimal
inventory levels related to just-in-time and build-to-order type manufacturing
processes, increase the risk that Quantum, as a supplier, will manufacture and
custom configure too much or too little inventory in support of OEM
manufacturing processes. Significant excess inventory conditions could result
in inventory write-downs and losses that could adversely impact Quantum's
results of operations, whereas inventory shortages could adversely impact
Quantum's relationship with its customers and Quantum's results of operations.
 
  Dependence on MKE Relationship. Quantum is dependent on MKE for the
manufacture of all of its hard disk drive products. Approximately 77% and 79%
of Quantum's sales in the first quarter of fiscal year 1999 and in fiscal year
1998, respectively, were derived from products manufactured by MKE. In
addition, the MKQC joint venture with MKE to develop and produce recording
heads used in disk drive production represents additional dependence on MKE.
Quantum's relationship with MKE is therefore critical to Quantum's business
and financial performance.
 
  Quantum's master agreement with MKE, which covers the general terms of the
business relationship, is effective through May 2007. The agreement may be
terminated sooner as a result of certain specified events including a change-
in-control of either Quantum or MKE. Quantum's relationship with MKE, which
dates from 1984, is built on Quantum's engineering and design expertise and
MKE's high-volume, high-quality manufacturing expertise.
 
                                      16
<PAGE>
 
  Quantum's dependence on MKE entails, among others, the following principal
risks:
 
    Quality and Delivery. Quantum relies on MKE's ability to bring new
  products rapidly to volume production at low cost to meet Quantum's
  stringent quality requirements, and to respond quickly to changing product
  delivery schedules from Quantum. This requires, among other things, close
  and continuous collaboration between Quantum and MKE in all phases of
  design, engineering, and production. Quantum's business and financial
  results would be adversely affected if products manufactured by MKE fail to
  satisfy Quantum's quality requirements or if MKE is unable to meet
  Quantum's delivery commitments. In the event MKE is unable to satisfy
  Quantum's production requirements, Quantum would not have an alternative
  manufacturing source to meet the demand without substantial delay and
  disruption to Quantum's operations. As a result, Quantum would be
  materially adversely affected.
 
    Volume and Pricing. MKE's production schedule is based on Quantum's
  forecasts of its product purchase requirements, and Quantum has limited
  contractual rights to modify short-term purchase orders issued to MKE.
  Further, the demand in the disk drive business is inherently volatile, and
  there is no assurance that Quantum's forecasts are accurate. In addition,
  Quantum periodically negotiates pricing arrangements with MKE. The failure
  of Quantum to accurately forecast its requirements or successfully adjust
  MKE's production schedule, which could lead to inventory shortages or
  surpluses, or the failure to reach pricing agreements reasonable to Quantum
  would have a material adverse effect on Quantum. For example, a portion of
  the $103 million special charge recorded in the third quarter of fiscal
  year 1998 reflected losses on firm inventory commitments associated with
  high-end disk drive production at MKE.
 
    Manufacturing Capacity and Capital Commitment. Quantum believes that
  MKE's current and committed manufacturing capacity should be adequate to
  meet Quantum's requirements at least through the end of fiscal year 1999.
  Quantum's future growth will require, however, that MKE continue to devote
  substantial financial resources to property, plant, and equipment and
  working capital to support manufacture of Quantum's products, as to which
  there can be no assurance. In the event that MKE is unable or unwilling to
  meet Quantum's manufacturing requirements, there can be no assurance that
  Quantum would be able to obtain an alternate source of supply. Any such
  failure to obtain an alternative source would have a material adverse
  effect on Quantum.
 
  MKQC--Joint Venture for MR Recording Heads Development and
Manufacturing. Since the fiscal year 1995 acquisition of MR recording heads
technology as part of the acquisition of certain businesses of the Storage
Business Unit of Digital Equipment Corporation, Quantum has made significant
efforts to advance the development of its MR recording heads capability. To
further this effort, MKE and Quantum formed a joint venture, MKQC, in the
first quarter of fiscal year 1998 to partner in the research, development, and
production of MR recording heads and technology. However, MR technology is
complex and, to date, Quantum and MKQC's MR recording head manufacturing
yields have been lower than was necessary for cost-effective production.
Quantum does not expect cost-effective production of MR recording heads to be
realized in the near term. Until that time, Quantum will incur losses based on
its pro rata ownership interest in the joint venture. However, there can be no
assurance that the anticipated benefits of the joint venture will be realized
on a timely basis or at all. Quantum's current target is to obtain 15% to 20%
of the MR recording heads used in its products from MKQC.
 
  Dependence on Suppliers of Components and Subassemblies; Component
Shortages. Both Quantum and its manufacturing partner, MKE, are dependent on
qualified suppliers for components and subassemblies, including recording
heads, media and integrated circuits, which are essential to the manufacture
of Quantum's disk drive and tape drive products. In connection with certain
products, Quantum and MKE qualify only a single source for certain components
and subassemblies, which can magnify the risk of shortages. Component
shortages have constrained Quantum's sales growth in the past, and Quantum
believes that the industry will periodically experience component shortages.
If component shortages occur, or if Quantum experiences quality problems with
component suppliers, shipments of products could be significantly delayed or
costs significantly increased, which would have a material adverse effect on
Quantum.
 
                                      17
<PAGE>
 
  Future Capital Needs. The information storage industry is capital, research
and development intensive and Quantum will need to maintain adequate financial
resources for capital expenditures, working capital, research and development
in order to remain competitive in the information storage business. Quantum
believes that it will be able to fund these capital requirements over the next
12 months. However, if Quantum decides to increase its capital expenditures
further, or sooner than presently contemplated, or if results of operations do
not meet Quantum's expectations, Quantum could require additional debt or
equity financing. There can be no assurance that such additional funds will be
available to Quantum or will be available on favorable terms. Quantum may also
require additional capital for other purposes not presently contemplated. If
Quantum is unable to obtain sufficient capital, it could be required to
curtail its capital equipment, research and development expenditures, which
could adversely affect Quantum.
 
  Warranty. Quantum generally warrants its products against defects for a
period of three to five years. A provision for estimated future costs relating
to warranty expense is recorded when products are shipped. Actual warranty
costs could have a material unfavorable impact on Quantum if the actual rate
of unit failure or the cost to repair a unit is greater than what Quantum used
to estimate the warranty expense accrual.
 
  Risks Associated with Foreign Manufacturing and Sales. Many of Quantum's
products and product components are currently manufactured outside the United
States. In addition, close to half of Quantum's revenue comes from sales
outside the United States, including sales to the overseas operations of
domestic companies. As a result, Quantum is subject to certain risks
associated with contracting with foreign manufacturers, including obtaining
requisite United States and foreign governmental permits and approvals,
currency exchange fluctuations, currency restrictions, political instability,
labor problems, trade restrictions, and changes in tariff and freight rates.
In addition, several Asian countries have recently experienced significant
economic downturns and significant declines in the value of their currencies
relative to the U.S. dollar. In the last four quarters, including the first
quarter of fiscal year 1999, Quantum experienced a year-over-year reduction in
sales to certain Asian countries due, in part, to the effects of these
factors. With most of Quantum's non-US sales being denominated in U.S.
dollars, Quantum is unable to predict what effect, if any, these factors will
have on its ability to maintain or increase its sales in these markets,
general economic conditions, and Quantum's customers.
 
  Foreign Exchange Contracts. Quantum manages the impact of foreign currency
exchange rate changes on certain foreign currency receivables and payables
using foreign currency forward exchange contracts. With this approach Quantum
expects to minimize the impact of changing foreign exchange rates on Quantum's
net income. However, there can be no assurance that all foreign currency
exposures will be adequately managed, and Quantum could incur material charges
as a result of changing foreign exchange rates.
 
  Volatility of Stock Price. The market price of Quantum's common stock has
been, and may continue to be extremely volatile. Factors such as new product
announcements by Quantum or its competitors; quarterly fluctuations in the
operating results of Quantum, its competitors, and other technology companies;
and general conditions in the information storage and computer market may have
a significant impact on the market price of the common stock. In particular,
when Quantum reports operating results that are less than the expectations of
analysts, the market price of the common stock can be materially adversely
affected.
 
  Litigation. Quantum and certain of its current and former officers and
directors have been named as defendants in two class-action lawsuits, one
filed on August 28, 1996 in the Superior Court of Santa Clara County,
California, and one filed on August 30, 1996 in the U.S. District Court of the
Northern District of California. The plaintiff in both class actions purports
to represent a class of all persons who purchased Quantum Common Stock between
February 26, 1996 and June 13, 1996. The complaints allege that the defendants
violated various federal securities laws and California statutes by concealing
and/or misrepresenting material adverse information about Quantum, and that
individual defendants sold shares of Quantum Common Stock based on material
nonpublic information. On February 25, 1997, in the Santa Clara County action,
the court sustained defendants' demurrer to most of the causes of action in
the complaint, with leave to amend. At a June 12, 1997 demurrer hearing in
state court, the judge dismissed the action as to four of the individual
defendants with prejudice and as to three of the individual defendants without
prejudice. The demurrer as to Quantum was
 
                                      18
<PAGE>
 
overruled. With respect to the federal action, on April 16, 1998, the court
granted defendants' motion to dismiss plaintiff's amended complaint with
prejudice. On May 19, 1998, plaintiff filed a notice of appeal of the District
Court's dismissal in the United States Court of Appeals for the Ninth Circuit.
 
  Certain of Quantum's current and former officers and directors were also
named as defendants in a derivative lawsuit which was filed on November 8,
1996 in the Superior Court of Santa Clara County. The derivative complaint was
based on factual allegations substantially similar to those alleged in the
class-action lawsuits. Defendants' demurrer to the derivative complaint was
sustained without prejudice on April 14, 1997. On August 7, 1997, the court
issued an order of dismissal and entered into final judgement dismissing the
complaint.
 
  Quantum is also subject to other legal proceedings and claims that arise in
the ordinary course of its business. While management currently believes the
amount of ultimate liability, if any, with respect to these actions will not
materially affect the financial position, results of operations, or liquidity
of Quantum, the ultimate outcome of any litigation is uncertain. In the event
of an unfavorable outcome of such litigation, Quantum's business and financial
condition could be materially adversely affected.
 
  Year 2000 Compliance. Many current computer systems and software products
may not correctly distinguish 21st century dates from 20th century dates. As a
result, computer systems and/or software used by many companies may need to be
upgraded to comply with such "Year 2000" requirements. Significant uncertainty
exists in the hardware and software industry concerning the potential effects
associated with such compliance. Quantum is developing and is in the process
of implementing plans to deal with identified Year 2000 information technology
issues. The plans include the implementation of significant system upgrades in
the first half of fiscal year 1999 intended to address Year 2000 information
technology issues. The upgrade effort involves both internal and external
resources, and depending on the results of Quantum's risk assessment, could
require Quantum to expend additional resources not reserved in its current
operating plan. In July 1998, certain significant information technology
systems upgrades were substantially completed. The incremental expenses
incurred to be in compliance with Year 2000 requirements during the first
quarters of fiscal year 1999 or 1998 were not material. In addition, Quantum
is in the process of performing a company-wide Year 2000 risk assessment.
Quantum plans to address significant risks that are identified as a result of
such risk assessment. The risk assessment includes addressing the Year 2000
readiness of its customers and key suppliers, including MKE. Quantum's
reliance on key suppliers, and therefore, Quantum's reliance on the proper
functioning of their information systems and software, means that their
failure to address Year 2000 issues could have a material adverse impact on
Quantum's financial results. While Quantum is taking all steps it believes are
appropriate and necessary to identify and resolve any Year 2000 issues, there
can be no assurance that Quantum will be able to identify and resolve such
issues in a timely or successful manner. The foregoing statements regarding
Quantum's Year 2000 plans and Quantum's expectations for resolving these
issues are forward-looking statements and actual results could vary. Quantum's
success in addressing Year 2000 issues could be impacted by the severity of
the problems encountered and to be resolved within Quantum, by its suppliers
and the amount to be expended on third party consultants and software.
 
RISKS RELATED TO ATL
 
  Fluctuations in Quarterly Operating Results. ATL's quarterly operating
results have fluctuated in the past and may continue to fluctuate in the
future based on a number of factors, not all of which are in ATL's control.
These factors include, without limitation, the size and timing of significant
customer orders; the introduction of new products by competitors; the
availability of components used in the manufacture of ATL's products; changes
in pricing policies by ATL, its suppliers or its competitors; the ability of
ATL to develop, introduce, market and gain market acceptance of new products,
applications and product enhancements in a timely manner and to control costs;
ATL's success in expanding and implementing its sales and marketing programs;
technological changes in the distributed computing markets; the Asian economic
crisis; the mix of sales among ATL's channels; deferrals of customer orders in
anticipation of new products, applications or product enhancements; currency
fluctuations; and general economic and market conditions. Moreover, ATL's
sales in any quarter typically consist of a relatively small number of large
original equipment manufacturer ("OEM") and value-
 
                                      19
<PAGE>
 
added reseller ("VAR") customer orders, and the timing of a small number of
orders can impact quarter to quarter results. The loss of or a substantial
reduction in orders from any significant customer could have a material
adverse effect on ATL's business, financial condition and results of
operations. Since ATL's sales are primarily made through OEMs and VARs who
typically provide ATL with relatively short lead times, it is often difficult
for ATL to forecast the timing and quantity of orders accurately. ATL's
expense levels and its purchases of parts, components and subassemblies are
based in part upon its expectations concerning future revenues. Accordingly,
if revenue levels are below expectations, whether as a result of product
transition or otherwise, operating results are likely to be adversely
affected. Due to all of the foregoing factors and other risks discussed below,
it is possible that in some future period ATL's operating results may be below
the expectations of analysts and investors.
 
  Dependence on DLT Technology. ATL currently derives substantially all of its
revenues from the sale of its DLT based products and related services. Even
though ATL believes that its automated tape library business is media
independent and that its products could be modified to incorporate tape drive
components other than the DLT drives, ATL expects that revenues from its DLT-
based products will continue to account for substantially all of ATL's
revenues for the foreseeable future. Accordingly, ATL's operating results for
the foreseeable future will be substantially dependent on the continued market
acceptance of DLT technology and growth of the DLT library market. The DLT
market is relatively new, and there can be no assurance that another
technology will not replace or adversely affect DLT technology as a widely
accepted data storage medium. In addition, due to the relatively recent
emergence of the DLT market, ATL expects that additional companies may
introduce products incorporating DLT technology competing directly with ATL.
Any decline in the rate of growth of the DLT market or failure of the market
to sustain acceptance of DLT technology, or any decline in unit prices of
ATL's products as a result of increased competition, technological change or
otherwise, would have a material adverse effect on the business, operating
results and financial condition of ATL.
 
  Dependence on Quantum Corporation. ATL's success depends, in large part,
upon its relationship with Quantum, who has the exclusive worldwide
manufacturing rights for the DLT technology and is the sole supplier of DLT
drives. In the event that the Merger is not completed, ATL will remain highly
dependent upon Quantum to obtain the DLT7000 drives, and could face increased
competition from Quantum, either directly, as a result of Quantum's
development of its own automated tape library business, or by virtue of
Quantum's acquisition of one of ATL's existing competitors. Quantum has also
historically sold DLTStor, a competing tape library addressing the lower end
of the distributed computing market, and may introduce other storage libraries
in the future either directly or through acquisition of one of ATL's existing
competitors. The existence of products which compete directly with ATL's
products could effect ATL's business, operating results and financial
condition. Moreover, since Quantum has only one manufacturing facility for DLT
drives located in Colorado Springs, Colorado, any disruption in Quantum's
ability to continue to manufacture and supply ATL with DLT tape drives,
whether as a result of a natural disaster or otherwise, would have a material
adverse effect on ATL's business, financial condition and results of
operations, regardless of whether or not the Merger is consummated.
 
  Effect of New Product Introductions. ATL's future operating results will
depend significantly on the degree and timing of market acceptance of ATL's
P1000 Series (which commenced volume shipments in the fourth quarter of fiscal
1998), the continued acceptance of ATL's 7100 Series (first volume shipment
commenced in the first quarter of fiscal 1998), ATL's P3000 Series (scheduled
for introduction in the third quarter of fiscal 1999) and other new products.
It is difficult to predict the effect that the announcement of these or other
new products (or enhancements to existing products) will have on sales of
current products pending the full availability of the new products, or the
rate at which such products will be accepted by the market, if at all. For
example, the P1000 may result in a reduction in the sales of ATL's 520 Series
products as customers re-evaluate their automated solutions requirements given
ATL's expanded product line. In addition, manufacturing defects or other
operational problems commonly associated with new product introductions could
adversely affect the successful introduction of such new products. There can
be no assurance that ATL will be able to introduce new products or
enhancements to existing products on a timely basis, if at all, or the effect
such introductions will have on sales of existing products.
 
  Competition. The data storage market is intensely competitive, highly
fragmented and characterized by rapidly changing technology and evolving
standards. Competitors vary in the number, scope and breadth of the
 
                                      20
<PAGE>
 
products and services offered. ATL's principal competitors include the
following manufacturers of DLT based products: ADIC, Breece Hill Technologies,
Hewlett-Packard, Overland Data and StorageTek. ATL also competes indirectly
with a large number of manufacturers offering tape storage systems using
formats other than DLT, including 8mm, 4mm (DAT), half inch format (3480) and
QIC. Many of these indirect competitors have larger installed bases and may be
expected to continue to provide intense competition for the DLT format. These
competitors include ADIC, Exabyte, Fujitsu, Hitachi, IBM, Spectra Logic and
StorageTek. ATL also competes with suppliers of other removable storage media
such as optical storage systems and cartridge disks. These competitors are
expected to expand the functionality and performance of their selected storage
technologies which may render such technologies even more competitive as
compared to DLT. ATL also expects additional competition from large integrated
computer equipment companies, many of whom have historically incorporated
their own tape storage products into their mainframe systems, and are
broadening their focus to include the distributed computing markets. In
addition, because there are relatively low barriers to entrance into the tape
library market, ATL anticipates increased competition from other established
and emerging companies. Increased competition is likely to result in price
reductions, reduced gross margins and loss of market share, any of which could
have a material adverse affect upon ATL's business, operating results and
financial condition. Many of ATL's current and potential competitors have
significantly greater financial, technical, manufacturing, marketing and other
resources than ATL, and may be able to respond more quickly to new or emerging
technologies and changes in customer requirements, or to devote greater
resources to the development, promotion, sale and support of their products
than ATL. Accordingly, there can be no assurance that ATL will be able to
continue to compete effectively.
 
  Reliance on OEMs and VARs; Concentration of Sales. ATL relies heavily upon
its relationships with selected OEMs who sell and support ATL's products as
part of their comprehensive data storage systems. Sales through OEMs accounted
for approximately 50% and 33% of ATL's total net sales in fiscal 1998 and
1997, respectively. ATL is currently investing, and intends to continue to
invest, significant resources to develop and expand these OEM relationships.
These expenditures could materially and adversely affect ATL's operating
margins unless ATL is able to achieve commensurate growth in sales to OEMs.
 
  ATL also relies heavily on selected VARs who integrate ATL's products with
storage management software to provide comprehensive storage solutions. Most
of ATL's VARs carry product lines that are competitive with those of ATL, and
there can be no assurance that they will give the marketing of ATL's products
high priority, or that they will continue to carry ATL's products. ATL's
agreements with VARs and OEMs are generally not required to be exclusive, and
in many cases may be terminated by either party at any time with limited
notice and without cause.
 
  A small number of customers has historically accounted for a substantial
portion of ATL's net sales and the identity of ATL's significant customers has
historically varied from period to period. Sales to EMC, DEC and Sun
Microsystems accounted for approximately 8.2%, 13.2% and 16.3%, respectively,
of ATL's total net sales for the fiscal year ended March 31, 1998. No other
customer accounted for 10% or more of ATL's total net sales during these
periods. The loss of any key OEM or VAR, such OEM's or VAR's reduced focus on
ATL's products, or the inability to obtain additional OEMs as the market
evolves could materially and adversely affect ATL's business, financial
condition and results of operations.
 
  Management of Expanding Operations. ATL is currently experiencing a period
of rapid growth which has placed and is expected to continue to place a
considerable strain on ATL's management and its administrative, sales and
marketing, financial, information systems and operational resources. From
April 1, 1997 to June 30, 1998, the size of ATL's staff increased from 176 to
385 employees and further increases in the number of employees are anticipated
during fiscal 1999. ATL believes its success will depend, in part, on its
ability to integrate these and additional new employees into ATL rapidly to
respond to the anticipated growth of ATL. ATL's ability to manage growth
effectively will require it to install its own operational, financial and
management controls, reporting systems and procedures independent from
Odetics, to establish new management information and control systems and to
train, motivate and manage its employees. There can be no assurance that ATL
will be able to install such operational, financial and management information
and control systems in
 
                                      21
<PAGE>
 
an efficient and timely manner or that the new structures, systems and
controls will be adequate to support ATL's operations and prevent the
occurrence of unforeseen management or financial issues. Continued growth will
also require ATL to recruit additional key management personnel to expand its
engineering and product development capabilities, expand its sales and
marketing capabilities, improve its customer service and support functions and
to train, motivate and manage additional employees. There can be no assurance
that ATL will be able to manage these changes and implement the required
programs successfully, and its failure to do so could have a material adverse
effect upon ATL's business, financial condition and operating results.
 
  Rapid Technological Change. The distributed computing market and the related
data storage market are characterized by rapid technological change, frequent
new product introductions and enhancements, and evolving industry standards.
This industry has been subject to fundamental changes reflecting the migration
from mainframe based systems to distributed computing environments, the
significant increase in the amount of data generated and stored in such
environments and end users' increasing dependence on near online access to
such data. ATL's ability to remain competitive will depend in part on its
ability to develop new and enhanced automated tape libraries in a timely and
cost effective manner in order to integrate the latest technological
advancements in storage media and to accommodate changes in the evolving
distributed computing networks. Since all of ATL's products are currently
based on DLT technology, any change in DLT technology or the emergence and
acceptance of any new technologies may require ATL to incur substantial
unanticipated costs to incorporate such changes, and there can be no assurance
that ATL will be able to complete such changes on a timely basis, if at all.
ATL's inability to incorporate advances or fundamental changes in storage
media could materially and adversely affect ATL's business, financial
condition and results of operations.
 
  Risks Associated with International Sales. International product sales
represented approximately 25% and 21% of ATL's total net sales during fiscal
1998 and 1997, respectively. ATL maintains sales and support offices in
England, Germany, Australia, Japan and Taiwan. ATL believes that international
sales will continue to represent a significant portion of its revenues, and
that continued growth and profitability will require further expansion of its
international operations. ATL's international sales are currently denominated
in U.S. dollars, and an increase in the relative value of the dollar could
make ATL's products more expensive and, therefore, potentially less price
competitive in international markets. Additional risks inherent in
international business activities generally include unexpected changes in
regulatory requirements, tariffs and other trade barriers, longer accounts
receivable payment cycles, difficulties in managing and staffing international
operations, potentially adverse tax consequences including restrictions on the
repatriation of earnings, the burdens of compliance with a wide variety of
foreign laws, currency fluctuations and devaluations and political and
economical instability. There can be no assurance that such factors will not
have a material adverse effect on ATL's future international sales and,
consequently, ATL's business, operating results and financial condition.
Furthermore, as ATL increases its international sales, its total revenues may
also be affected to a greater extent by seasonal fluctuations resulting from
lower sales that typically occur during the summer months in Europe and other
parts of the world.
 
  Dependence on Proprietary Technology; Risks of Infringement. ATL's ability
to compete effectively depends in part on its ability to develop and maintain
the proprietary aspects of its technology. There can be no assurance, however,
that any future patents will be granted or that any issued patents or other
intellectual property rights of ATL will provide meaningful protection for
ATL's product innovations. Moreover, such rights may not preclude competitors
from developing substantially equivalent or superior products to ATL's
products. In addition, the laws of some foreign countries do not protect ATL's
proprietary rights as fully as do the laws of the United States. There can be
no assurance that ATL's means of protecting its proprietary rights in the
United States or abroad will be adequate, or that competitors will not
independently develop technologies that are similar or superior to ATL's
technology, duplicate ATL's technology, or design around any patent of ATL.
Litigation may be necessary in the future to enforce ATL's intellectual
property rights, to determine the validity and scope of the proprietary rights
of others, or to defend ATL against claims of infringement or invalidity by
others. An adverse outcome in such litigation or similar proceedings could
subject ATL to significant liabilities to third parties, require disputed
rights to be licensed from others or require ATL to cease marketing or using
certain products, any of which could have a material adverse effect on ATL's
business, financial condition and results
 
                                      22
<PAGE>
 
of operations. If ATL is required to obtain licenses under patents or
proprietary rights of others, there can be no assurance that any required
licenses would be made available on terms acceptable to ATL, if at all. In
addition, the cost of addressing any intellectual property litigation claim,
both in legal fees and expenses and the diversion of management resources,
regardless of whether the claim is valid, could be significant and could have
a material adverse effect on ATL's results of operations.
 
  Future Capital Requirements. On March 25, 1998, ATL obtained a $20.0 million
revolving working capital facility through January 2000 and a $6.5 million
term loan also due in January 2000, which was increased to $10.5 million in
July 1998. While ATL believes that these facilities should be sufficient to
meet its current obligations, ATL does continue to operate in a high growth
market with limited capital resources. ATL believes that in order to remain
competitive, it may require additional financial resources over the next year
for working capital, research and development, and the expansion of sales,
marketing and general and administrative functions.
 
  Anti-Takeover Effect of Stockholder Rights Plan. On March 12, 1998, the ATL
Board adopted a Stockholder Rights Plan (the "ATL Rights Plan"). Under terms
of the ATL Rights Plan, preferred stock purchase rights ("Rights") were
distributed to ATL's stockholders as a dividend at the rate of one Right for
each share of ATL Class A Common Stock held as of the close of business on
March 23, 1998. The Rights are designed to guard against partial tender offers
and other abusive and coercive tactics that might be used in an attempt to
gain control of ATL without paying all stockholders a fair price for their
shares. Each Right entitles stockholders to buy one one-thousandth of a share
of Series A Preferred Stock of ATL at an exercise price of $60.00. In general,
the Rights will be exercisable only if a person or group acquire 15% of more
of ATL's Common Stock. Although these Rights are not intended to prevent a
takeover, any Rights Plan could be considered to delay or make a merger,
tender offer, or proxy contest more difficult thereby potentially adversely
affecting the market price of the ATL Class A Common Stock. On May 18, 1998,
ATL amended the Rights Plan to permit Quantum to acquire an interest in ATL
without triggering a distribution or exercise of Rights.
 
  Year 2000 Compliance. Many current computer systems and software products
may not correctly distinguish 21st century dates from 20th century dates. As a
result, computer systems and/or software used by many companies may need to be
upgraded to comply with such "Year 2000" requirements. Significant uncertainty
exists in the hardware and software industry concerning the potential effects
associated with such compliance. All of ATL's core products have been designed
to be Year 2000 compliant. ATL has scheduled a change to its MRP system for
the fourth quarter of 1998 to utilize a version of the system which is
expected to be Year 2000 compliant. ATL believes that all of its other
business systems will be Year 2000 compliant, but will continue to pursue
certification of compliance for all critical business systems. ATL has made
Year 2000 compliance a requirement for all purchases of its business systems.
ATL may be required to expend additional resources to make Year 2000
compliance corrections to its information systems, which corrections may not
be able to be made in a timely basis, if at all. ATL believes that the Year
2000 issues may affect purchasing patterns of customers and potential
customers in a variety of ways. Many companies are expending significant
resources to correct their current systems for Year 2000 compliance. These
expenditures may result in reduced funds available to purchase products such
as those offered by ATL. Many potential customers may also choose to defer
purchasing Year 2000 compliant products until they believe it is absolutely
necessary, thus resulting in potentially stalled market sales within the
industry. In addition, Year 2000 issues could cause a significant number of
companies, including current customers of ATL, to reevaluate their current
systems needs, and, as a result consider switching to other systems or
suppliers. Any of the foregoing could have a material adverse effect on ATL's
business, financial condition and results of operations. ATL also relies,
directly and indirectly, on the external systems of business enterprises such
as customers, suppliers, creditors and financial organizations for accurate
exchange of data. Even if ATL's products or its internal systems are not
materially affected by the Year 2000 issue, the Company could be affected
through disruptions in the operations of the enterprises with which ATL
interacts. Despite ATL's efforts to address the impact of the Year 2000 issue
on its internal systems and business operations, there can be no assurance
that such impact will not result in a material disruption of its business or
have a material adverse effect on ATL's business, financial condition or
results of operations.
 
                                      23
<PAGE>
 
                          COMPARATIVE PER SHARE DATA
 
  The following table sets forth certain historical per share data of Quantum
and ATL for the fiscal year ended March 31, 1998 and combined per share data
for such period on an unaudited pro forma basis after giving effect to the
Merger on a purchase basis of accounting. This data should be read in
conjunction with the selected financial data and the historical consolidated
financial statements and notes thereto of Quantum and ATL incorporated by
reference and included elsewhere herein, respectively. The pro forma combined
financial data is not necessarily indicative of the operating results that
would have been achieved had the Merger been consummated as of the beginning
of the period presented nor is such data necessarily indicative of future
financial condition or results of operations.
 
<TABLE>
<CAPTION>
                                                                 PRO FORMA
                                                 HISTORICAL       COMBINED
                                                ------------- ----------------
                                                QUANTUM  ATL  QUANTUM ATL(/3/)
                                                ------- ----- ------- --------
<S>                                             <C>     <C>   <C>     <C>
YEAR ENDED MARCH 31, 1998
Diluted earnings per share(/1/)................  $1.07  $ .83  $ .95   $ 1.57
Historical book value per share(/1/)(/2/)......   8.53   1.76   8.59    14.23
QUARTER ENDED JUNE 30, 1998 (ATL) AND JUNE 28,
 1998 (QUANTUM)
Diluted earnings per share(/1/)................    .02    .19    .01      .02
Historical book value per share(/1/)(/2/)......   7.82   1.95   7.96    13.19
</TABLE>

- --------
(1) On a preliminary basis, Quantum estimates goodwill and other intangibles
    of approximately $130 million will result from the Merger, which will
    result in annual amortization expense of approximately $13 million
    (assuming an average life of ten years). Quantum expects to recognize a
    significant charge upon the closing of the Merger for acquired in-process
    research and development.
 
(2) Historical book value per share is computed by dividing stockholders'
    equity by the number of shares of Common Stock outstanding at March 31,
    1998. The pro forma combined book value for Quantum is computed by
    dividing the pro forma combined stockholders' equity by the pro forma
    number of shares of Quantum Common Stock outstanding at March 31, 1998.
 
(3) The ATL equivalent pro forma combined per share amounts are calculated by
    multiplying the Quantum pro forma combined amounts by 1.657, which is the
    Exchange Ratio assuming the per share Quantum Deemed Value is $17.50. For
    each $1.00 per share change in the Quantum Deemed Value, the pro forma
    combined diluted earnings for the year ended March 31, 1998 and the three
    months ended June 30, 1998, and the book value per ATL equivalent share at
    June 30, 1998 is expected to change by approximately $.09, $.01, and $.69,
    respectively. See "THE MERGER--Conversion of Shares in the Merger;
    Assumption of Options."
 
PRO FORMA FINANCIAL INFORMATION
 
  Pro forma financial information of the combined entities has not been
included because ATL and Quantum believe such information is not materially
different from Quantum's historical financial information.
 
                                      24
<PAGE>
 
                           MARKET PRICE INFORMATION
 
HISTORICAL PRICE DATA
 
  The table below sets forth, for the fiscal quarters indicated, the reported
high and low closing prices during such quarters of Quantum Common Stock
(adjusted to reflect a two-for-one stock split in May 1997) and ATL Class A
Common Stock, as reported on Nasdaq.
 
<TABLE>
<CAPTION>
                                                   QUANTUM        ATL CLASS A
                                                COMMON STOCK    COMMON STOCK(1)
                                              ----------------- ----------------
                                                HIGH     LOW     HIGH     LOW
                                              -------- -------- ----------------
<S>                                           <C>      <C>      <C>     <C>
FISCAL 1996
  First Quarter.............................. 13 5/32   7 1/2   *       *
  Second Quarter............................. 13 25/32  10 7/16 *       *
  Third Quarter.............................. 10 7/16   8 1/16  *       *
  Fourth Quarter............................. 9 15/16   8 5/16  *       *
FISCAL 1997
  First Quarter.............................. 13        7 1/32  *       *
  Second Quarter.............................  9 3/16   5 1/2   *       *
  Third Quarter.............................. 14 7/8    8 21/32 *       *
  Fourth Quarter............................. 22 17/32 13 3/4   12 7/8  8
FISCAL 1998
  First Quarter.............................. 24 9/16  17 7/8   11 1/4  7 1/2
  Second Quarter............................. 42 7/16  20 5/16  13 1/2  8 5/8
  Third Quarter.............................. 42 7/16  18 15/16 15 1/8  9 1/8
  Fourth Quarter............................. 26 1/2   18 7/16  16 1/2  9 1/8
FISCAL 1999
  First Quarter.............................. 25 3/4   18       26 3/4  16 3/16
  Second Quarter (through August 17, 1998)... 22 1/8   15       28 5/8  25 5/8
</TABLE>

- --------
*  The ATL Class A Common Stock began trading on Nasdaq on March 7, 1997.
   Prior to such date, there was no established trading market for ATL Class A
   Common Stock.
 
RECENT PRICE DATA
 
  The table below sets forth the closing prices per share of Quantum Common
Stock and ATL Class A Common Stock on Nasdaq on May 18, 1998, the last full
trading date prior to the public announcement of the signing of Merger
Agreement, and on July 31, 1998, the last practicable trading date for which
information is available before the printing of the Proxy
Statement/Prospectus; and the equivalent per share prices for ATL Common Stock
based on the Quantum Common Stock prices multiplied by the Exchange Ratio of
1.3034 and 1.657 shares of Quantum Common Stock for each share of ATL Common
Stock outstanding calculated as of May 18, 1998 and July 31, 1998,
respectively (estimated based on an assumed Quantum Deemed Value equal to the
closing price of Quantum Common Stock on such dates).
 
<TABLE>
<CAPTION>
                                                     ATL
                                      QUANTUM      CLASS A       ATL
                                    COMMON STOCK COMMON STOCK EQUIVALENT
                                    ------------ ------------ ----------
<S>                                 <C>          <C>          <C>        
May 18, 1998.......................   $ 22.25     $ 26.75      $ 29.00
July 31, 1998......................     17.50       27.3125      29.00
</TABLE>
 
                                      25
<PAGE>
 
  Because the Quantum Deemed Value will not be determined until the Effective
Time, the Exchange Ratio is floating, and accordingly, changes in the market
price of Quantum Common Stock will affect the number of shares of Quantum
Common Stock to be received by stockholders of ATL in the Merger. ATL
stockholders are urged to obtain current market quotations for Quantum Common
Stock and ATL Class A Common Stock prior to the ATL Special Meeting.
 
DIVIDENDS
 
  Historically, neither Quantum nor ATL has declared or paid cash dividends on
its capital stock. The Board of Directors of Quantum presently intends to
retain all earnings for use in Quantum's business and therefore does not
anticipate declaring or paying any cash dividends in the foreseeable future.
 
 
                                      26
<PAGE>
 
                            THE ATL SPECIAL MEETING
 
DATE, TIME, PLACE AND PURPOSE
 
  This Proxy Statement/Prospectus is being furnished to holders of ATL Common
Stock in connection with the solicitation of proxies by the Board of Directors
of ATL for use at the ATL Special Meeting to be held at the Hyatt Regency
Irvine, located at 17900 Jamboree Road, Irvine, California 92614 at 2:00 p.m.,
Pacific Time, on September 24, 1998 or at any adjournments or postponements
thereof, for the purposes set forth herein and in the accompanying Notice of
Special Meeting of Stockholders.
 
MATTERS TO BE CONSIDERED AT THE ATL SPECIAL MEETING
 
  At the ATL Special Meeting, stockholders of record of ATL as of the close of
business on August 10, 1998 will be asked to consider and vote upon proposals
(i) to approve and adopt the Merger Agreement and to approve the Merger and
(ii) to transact such other business as may properly come before the ATL
Special Meeting or any postponements or adjournments thereof.
 
  THE BOARD OF DIRECTORS OF ATL HAS DETERMINED THAT THE MERGER IS ADVISABLE
AND IN THE BEST INTERESTS OF ATL AND ITS STOCKHOLDERS, HAS UNANIMOUSLY
APPROVED THE MERGER AGREEMENT AND THE MERGER, AND RECOMMENDS A VOTE BY THE
STOCKHOLDERS OF ATL FOR APPROVAL AND ADOPTION OF THE MERGER AGREEMENT AND
APPROVAL OF THE MERGER.
 
RECORD DATE; VOTING AT THE ATL SPECIAL MEETING; VOTE REQUIRED
 
  The Board of Directors of ATL has fixed August 10, 1998 as the record date
for the determination of the stockholders of ATL entitled to notice of and to
vote at the ATL Special Meeting. Only holders of record of ATL Common Stock on
the record date will be entitled to notice of and to vote at the ATL Special
Meeting. As of the record date, 9,655,000 shares of ATL Class A Common Stock
were outstanding and 333 shares of ATL Class B Common Stock were outstanding.
Each record holder of ATL Class A Common Stock and Class B Common Stock on the
record date is entitled to cast one vote per share and one-twentieth of one
vote per share, respectively, exercisable in person or by properly executed
proxy, on each matter properly submitted for the vote of the stockholders of
ATL at the ATL Special Meeting.
 
  The presence, in person or by properly executed proxy, of the holders of a
majority of the outstanding shares of ATL Common Stock entitled to vote at the
ATL Special Meeting is necessary to constitute a quorum at the ATL Special
Meeting. The approval of the Merger Agreement and the Merger will require the
affirmative vote of the holders of at least a majority of the outstanding
shares of ATL Common Stock entitled to vote thereon.
 
  As of the record date, directors, executive officers and affiliates of ATL
may be deemed to be the beneficial owners of approximately 10.6% of the
outstanding shares of ATL Common Stock. Each of the directors and executive
officers of ATL plans to vote or direct the vote of all shares of ATL Common
Stock over which he has voting control in favor of the Merger Agreement and
the Merger.
 
ABSTENTIONS; BROKER NON-VOTES
 
  If an executed ATL proxy is returned and the stockholder has specifically
abstained from voting on any matter, the shares represented by such proxy will
be considered present at the ATL Special Meeting for the purpose of
determining a quorum. If an executed proxy is returned by a broker holding
shares in street name which indicates that the broker does not have
discretionary authority as to certain shares to vote on one or more matters,
such shares will be considered present at the meeting for purposes of
determining a quorum. Since the required vote of the stockholders of ATL is
based on the number of outstanding shares of ATL Common Stock, abstentions and
broker non-votes will have the same effect as a vote against approval and
adoption of the Merger Agreement.
 
                                      27
<PAGE>
 
SOLICITATION OF PROXIES AND EXPENSES
 
  This Proxy Statement/Prospectus is being furnished to holders of ATL Common
Stock in connection with the solicitation of proxies by and on behalf of the
Board of Directors of ATL for use at the ATL Special Meeting. All shares of
ATL Common Stock that are entitled to vote and are represented at the ATL
Special Meeting by properly executed proxies received prior to or at the ATL
Special Meeting and not duly and timely revoked, will be voted at the ATL
Special Meeting in accordance with the instructions indicated on such proxies.
If no instructions are indicated, such proxies will be voted FOR approval and
adoption of the Merger Agreement and approval of the Merger.
 
  If any other matters are properly presented for consideration at the ATL
Special Meeting (or any adjournments or postponements thereof), including,
among other things, consideration of a motion to adjourn or postpone the ATL
Special Meeting to another time and/or place (including, without limitation,
for the purpose of soliciting additional proxies), the persons named in the
enclosed forms of proxy and voting thereunder will have discretion to vote on
such matters in accordance with their best judgment.
 
  Any proxy given pursuant to this solicitation may be revoked by the person
giving it at any time before it is voted. Proxies may be revoked by (i) filing
with the Secretary of ATL at or before the taking of the vote at the ATL
Special Meeting, a written notice of revocation bearing a later date than the
proxy, (ii) duly executing a later dated proxy relating to the same shares and
delivering it to the Secretary of ATL before taking the vote at the ATL
Special Meeting or (iii) attending the ATL Special Meeting and voting in
person (although attendance at the ATL Special Meeting will not in and of
itself constitute a revocation of a proxy). Any written notice of revocation
or subsequent proxy should be sent so as to be delivered to ATL Products,
Inc., 2801 Kelvin Avenue, Irvine, California 92614, Attention: Secretary, or
hand-delivered to the Secretary of ATL at or before taking the vote at the ATL
Special Meeting.
 
  In addition to solicitation by use of the mails, proxies may be solicited by
directors, officers and employees of ATL in person or by telephone, facsimile
or other means of communication. Such directors, officers and employees will
not be additionally compensated, but may be reimbursed for reasonable out-of-
pocket expenses in connection with such solicitation. ATL has retained
Georgesen & Company, Inc. at an estimated cost of approximately $10,000 plus
reimbursement of expenses, to assist in their solicitations of proxies from
brokers, nominees, institutions and individuals. Arrangements will also be
made with custodians, nominees and fiduciaries for forwarding proxy
solicitation materials to beneficial owners of shares held of record by such
custodians, nominees and fiduciaries, and ATL will reimburse such custodians,
nominees and fiduciaries for reasonable expenses incurred in connection
therewith.
 
  STOCKHOLDERS SHOULD NOT SEND ANY STOCK CERTIFICATES WITH THEIR PROXY CARDS.
 
                                      28
<PAGE>
 
                                  THE MERGER
 
  This section of the Proxy Statement/Prospectus describes certain aspects of
the proposed Merger. The following description does not purport to be
complete. The discussion of the Merger in this Proxy Statement/Prospectus and
the description of the principal terms of the Merger Agreement are subject to
and qualified in their entirety by reference to the Merger Agreement, a copy
of which is attached to this Proxy Statement/Prospectus as Appendix A. ALL
HOLDERS OF ATL COMMON STOCK ARE ENCOURAGED TO READ THE MERGER AGREEMENT AND
THE OTHER APPENDICES IN THEIR ENTIRETY.
 
BACKGROUND OF THE MERGER
 
  In 1992, ATL chose DLT drives as the medium of choice in its new generation
of automated tape libraries. At that time, Digital Equipment Corporation
("DEC") and ATL entered into a joint development agreement to develop and
market automated DLT libraries to the networked computer market. DEC was the
developer and the sole source provider of DLT technology. This arrangement
resulted in several successful products which are still being sold by both DEC
and ATL. In 1994, DEC sold its interest in several storage technologies and
products, including DLT, to Quantum, thus making Quantum the sole source for
DLT tape drives. By this time, over 80% of ATL's products utilized the DLT
technology. ATL entered into an OEM supply agreement with Quantum for DLT
drives and has engaged in various arms length business arrangements with
Quantum in the ordinary course of business since that time.
 
  Quantum has been ATL's sole source of tape drives and its most strategically
important single supplier since 1994. ATL has been Quantum's largest single
tape library OEM customer for successive generations of DLT drives. The
parties have worked closely together in the development of Quantum's DLT
drives, in the introduction of successive generations of the technology and in
the integration of the DLT drives with ATL's automation technology.
 
  In November 1997, representatives of Quantum initiated contact with ATL and
expressed Quantum's interest in taking a "significant position" in ATL. At a
meeting held on November 11, 1997, Peter van Cuylenburg, President of
Quantum's Specialty Storage Products Group ("SSPG"), suggested to ATL that
Quantum's tape automation business, which offers entry level tape automation
systems and tape autoloaders, be combined with ATL's high end and mid-range
tape automation libraries in an independent company partially owned by
Quantum, but operated by existing ATL management as an independent and
substantially autonomous public company. On November 21, 1997, the two
companies exchanged, subject to a mutual nondisclosure and standstill
agreement, certain nonpublic information concerning their respective
businesses for the purpose of considering such a business relationship.
 
   After substantial review and analysis, the ATL Board concluded that,
although there were significant synergistic opportunities in combining the two
businesses, ATL lacked sufficient resources to manage its own rapidly
expanding tape automation business while coordinating the integration of
Quantum's entry level tape automation business which had revenues almost equal
to those of ATL. When this determination was communicated to representatives
of Quantum in December 1997, Quantum indicated that it wished to continue and
to expand discussions concerning a business combination with ATL, and stated
that it would be enthusiastic about a cash merger and the formation of a
wholly-owned subsidiary of Quantum managed by ATL to pursue the combined
business opportunity on an "arms length" basis with the rest of Quantum--in
particular with the DLT drive business which was also part of Quantum's SSPG.
ATL engaged NationsBanc Montgomery as its financial advisor in connection with
a possible business combination with Quantum on December 4, 1997.
 
  ATL and Quantum assessed the strategic opportunity of the business
combination and the financial implications of a merger upon both companies
during January 1998. The companies met in January 1998 to consider the
implications of a business combination. Although there was a range of
perspectives on valuation, the companies determined that there was sufficient
common ground to continue the discussions.
 
 
                                      29
<PAGE>
 
  During February 1998, both companies, in coordination with their financial
advisors, assessed various alternatives to the original structure of the
merger as proposed by Quantum. Among the alternatives considered was the
inclusion of a stock component in the Quantum offer. During the same period,
the companies addressed issues relating to the technical independence of ATL
and the impact of a merger on both ATL and Quantum OEM customers.
 
  By March 1998, the companies had determined that there was sufficient common
ground to proceed with a formal due diligence investigation on the part of
Quantum. The ATL Board concurred with the decision to proceed with the due
diligence. Quantum assembled a team to conduct the due diligence and met with
appropriate ATL individuals on March 3, 1998. ATL responded to a number of
action items generated during the due diligence over the subsequent several
weeks. The feedback from Quantum at the end of March was that the due
diligence results were generally favorable and that Quantum was proceeding
internally to construct a formal offer for ATL and to have that offer approved
at the staff and Board level.
 
  Kevin Daly, Ph.D., Chairman of the Board, Chief Executive Officer and
President of ATL, met with Peter van Cuylenburg on April 6, 1998 to review the
findings of the due diligence team and to assess the situation. The Quantum
perspective, after the due diligence, was positive but there was still a
material range between the parties' respective valuation analyses. The ATL
Board took the position that it would approve a request from Quantum to submit
an offer for ATL if the valuation range for ATL to be proposed by Quantum and
that is potentially acceptable to ATL had reasonable common ground. On April
10, 1998, Mr. Cuylenburg, on behalf of Quantum formally requested ATL's
permission to submit an offer for ATL as required by the terms of the
standstill agreement. Dr. Daly granted that permission. On April 14, 1998,
Rick Clemmer, Chief Financial Officer of Quantum, came to ATL and presented an
informal offer for ATL. After some discussion it was determined that a
variation of that offer would meet the criteria which the ATL Board set for
submission of a formal offer. Quantum's formal offer for ATL was submitted to
Dr. Daly by a letter dated April 16, 1998. Quantum requested permission to
present the offer to the ATL Board at the Board's earliest convenience. The
offer was submitted to the ATL Board, and the ATL Board met on April 30, 1998
to consider the offer, among other business.
 
  Quantum formally presented its offer for ATL to the ATL Board on May 1,
1998, at a meeting which was also attended by ATL's counsel and financial
advisors. This offer was consistent with the offer contained in Quantum's
April 16, 1998 letter. The Board met with its advisors to consider the offer
and, during the day of May 1, met several times with Quantum to consider
various aspects of the offer and to address modifications in the offer
required by the Board. By the end of the day on May 1, 1998, the ATL Board and
Quantum agreed that there existed an acceptable basis for a combination of the
two companies, subject to agreement between the parties concerning the terms
of a definitive agreement.
 
  During the following ten days, the parties and their respective counsel and
financial advisors conferred on a daily basis concerning open issues
pertaining to the definitive agreement. The ATL Board met by teleconference on
May 11, 1998 to assess the progress of the formulation of the definitive
agreement and to discuss open issues with regard to the merger. ATL management
and Quantum management, and their advisors, conducted several teleconferences
on May 11 and May 12, 1998 to resolve open issues. On the evening of May 12,
1998, the ATL Board held a teleconference to review the status of the
definitive agreement and determined that there were still several open issues.
ATL management and Quantum management continued to work on the definitive
agreement through May 15. On May 15, 1998 ATL and its advisors held a
teleconference with Quantum and Salomon Smith Barney, Quantum's financial
advisors for this transaction, to conduct financial due diligence regarding
Quantum financial performance. In the afternoon of May 15, 1998, the ATL Board
conducted a teleconference to review the open issues associated with the
merger. Discussions with Quantum continued through the morning of May 18,
1998.
 
  On May 18, 1998, the ATL Board met by teleconference and discussed with its
advisors the final changes to the definitive agreement, the status of the
negotiations with Quantum and the terms of the proposed Merger Agreement.
NationsBanc Montgomery presented to the ATL Board its analysis of the fairness
of the proposed Merger transaction and indicated that it was prepared to
deliver its opinion to the effect that the Merger was fair
 
                                      30
<PAGE>
 
from a financial point of view to ATL stockholders. Following the discussions,
the ATL Board voted unanimously to approve the definitive agreement with
Quantum, and each company executed and delivered the Merger Agreement and
related documents. The Merger Agreement was announced immediately thereafter
by the issuance of a joint press release.
 
RECOMMENDATION OF THE ATL BOARD
 
  THE ATL BOARD HAS APPROVED THE MERGER AGREEMENT AND THE MERGER, AND BELIEVES
THAT THE TERMS OF THE MERGER AGREEMENT ARE FAIR TO, AND THAT THE MERGER IS IN
THE BEST INTERESTS OF, ATL AND ITS STOCKHOLDERS AND THEREFORE RECOMMENDS THAT
THE HOLDERS OF ATL COMMON STOCK VOTE FOR APPROVAL AND ADOPTION OF THE MERGER
AGREEMENT AND APPROVAL OF THE MERGER. See "--Reasons for the Merger." Certain
members of the ATL Board may be deemed to have a conflict of interest in
recommending stockholder approval of the Merger. See "--Interests of Certain
Persons in the Merger."
 
INTERESTS OF CERTAIN PERSONS IN THE MERGER
 
  In considering the recommendation of the ATL Board with respect to the
Merger Agreement, holders of ATL Common Stock should be aware that members of
the ATL Board and the executive officers of ATL have certain interests in the
Merger that are in addition to the interests of holders of ATL Common Stock
generally. These interests are more fully described below and include the
acceleration of the vesting of certain ATL Stock Options and certain rights of
indemnification.
 
  Stock and Option Holdings of Directors and Officers. Under the Merger
Agreement, at the Effective Time, each outstanding ATL Stock Option will be
assumed by Quantum. Each Assumed Option will continue to have, and be subject
to, the same terms and conditions set forth in the applicable ATL stock option
plan, except that (i) each Assumed Option will be exercisable (or will become
exercisable in accordance with its terms) for the number of whole shares of
Quantum Common Stock equal to the product of the number of shares of ATL
Common Stock that were issuable upon exercise of such ATL Stock Option
immediately prior to the Effective Time multiplied by the Exchange Ratio; (ii)
the per share exercise price for the shares of Quantum Common Stock issuable
upon exercise of such assumed ATL Stock Option will be equal to the quotient
determined by dividing the exercise price per share of ATL Common Stock at
which such ATL Stock Option was exercisable immediately prior to the Effective
Time by the Exchange Ratio; and (iii) 50% of the unvested ATL Stock Options
held by persons other than certain executive officers named in the Merger
Agreement shall immediately vest at the Effective Time; provided that no
additional vesting of ATL Stock Options held by such person shall occur until
such time as vesting would have occurred with respect to the accelerated
portion of such person's ATL Stock Options under the vesting schedule existing
immediately prior to the Effective Time.
 
                                      31
<PAGE>
 
  The chart below indicates as to the specified individuals (i) the number of
ATL Stock Options held by such individuals and (ii) the exercise price of such
ATL Stock Options:
 
<TABLE>
<CAPTION>
                             NUMBER OF CLASS A NUMBER OF CLASS B EXERCISE PRICE
  OPTION HOLDER                OPTION SHARES     OPTION SHARES     PER SHARE
  -------------              ----------------- ----------------- --------------
<S>                          <C>               <C>               <C>
Kevin C. Daly, Ph.D.........          --            250,000          $ 5.00
Mark P. de Raad.............      50,000                 --           9.125
Chester Baffa...............          --             50,000            5.00
Todd Kreter.................          --             50,000            5.00
Gregory A. Miner(1).........          --                 --              --
Steve Morihiro..............          --             50,000            5.00
Mark P. Spowart.............          --             50,000            5.00
Crandall Gudmundson(2)......      10,000                 --           9.125
Joel Slutzky(2).............      10,000                 --           9.125
Thomas L. Thomas(2).........      20,000                 --           9.125
Paul E. Wright(2)...........      20,000                 --           9.125
</TABLE>
- --------
(1) Mr. Miner served as Chief Financial Officer of ATL from January 1994 until
    September 1997.
(2) Options held by members of the Board of Directors who are not officers
    will accelerate in accordance with their terms at the Effective Time.
 
  ATL Severance Plan. The executive officers of ATL are participants in the
ATL Severance Plan (the "Severance Plan"), adopted by the ATL Board effective
April 1, 1998, which provides for the payment of certain separation benefits
to officers and other employees of ATL in the event of termination, other than
for cause, following a change in control of ATL. The Severance Plan defines a
"change in control" of ATL generally as any of the following transactions: (a)
the acquisition by an unrelated third party of beneficial ownership of more
than 50% of the voting securities of ATL by a tender or exchange offer made
directly to ATL's stockholders, (b) a merger or consolidation in which
securities possessing more than 50% of the total combined voting power of
ATL's securities are transferred to persons different than those holding such
securities immediately prior to the transaction, or (c) the sale, transfer or
other disposition of all or substantially all of ATL's assets in a complete
liquidation or dissolution of ATL.
 
  Under the Severance Plan, certain officers of ATL are entitled to receive
twice their annual compensation (then current base salary and management bonus
plan) for a period of two years following termination. Benefits will also be
provided for the same period, and the acquiror will provide executive
outplacement, financial counseling and gross-up payments for any excise taxes
imposed on any parachute payments and any income taxes or excise taxes
relating to the gross-up payment. There is no requirement of mitigation and
payments are not reduced if the participant finds employment during the payout
period; provided, however, that the recipient may not render services for any
competitive organization or engage in any business competitive with ATL.
 
  In addition to actual termination, officers may terminate their employment
and be entitled to separation benefits if at any time during the two year
period following the closing of a change of control transaction (the
"Closing") (i) the officer's annual compensation (including average annual
bonus during the preceding three years or such shorter term as the officer has
been employed) is reduced below the highest amount such officer has earned
from and including the date of the Closing, (ii) the officer's duties,
responsibilities (including title and reporting requirements) and perquisites
are diminished in comparison to his or her duties, responsibilities and
perquisites immediately prior to the Closing, or (iii) the officer is required
to be based at a location more than 25 miles from the location where his or
her services were performed on the date of the Closing or is required to
travel materially more often or for materially longer periods than required
prior to the Closing.
 
  Indemnification and Insurance. The Merger Agreement provides that, from and
after the Effective Time, Quantum will cause the surviving corporation to
fulfill and honor in all respects the obligations of ATL pursuant to any
indemnification agreements between ATL and its directors and officers as of
the Effective Time (the
 
                                      32
<PAGE>
 
"Indemnified Parties") and any indemnification provisions under ATL's
Certificate of Incorporation or Bylaws as in effect on the date of the Merger
Agreement. The Certificate of Incorporation and Bylaws of the surviving
corporation will contain provisions with respect to exculpation and
indemnification that are at least as favorable to the Indemnified Parties as
those contained in the Certificate of Incorporation and Bylaws of ATL as in
effect on the date of the Merger Agreement, which provisions will not be
amended, repealed or otherwise modified for a period of six (6) years from the
Effective Time in any manner that would adversely affect the rights thereunder
of individuals who, immediately prior to the Effective Time, were directors,
officers, employees or agents of ATL, unless such modification is required by
law.
 
  For a period of six (6) years after the Effective Time, Quantum will cause
the surviving corporation in the Merger to maintain in effect, if available,
directors' and officers' liability insurance covering those persons who are
currently covered by ATL's directors' and officers' liability insurance policy
on terms comparable to those applicable to the directors and officers of ATL
as of the date of the Merger Agreement; provided, however, that (i) the
surviving corporation may substitute for the existing policy a policy or
policies of comparable coverage, and (ii) in no event will Quantum or the
surviving corporation be required to expend in excess of 150% of the annual
premium currently paid by ATL for such coverage (or such coverage as is
available for 150% of such annual premium).
 
  The foregoing interests of the directors and certain members of management
of ATL in the Merger may mean that such persons have personal interests in the
Merger which may not be identical to the interests of other stockholders of
ATL.
 
REASONS FOR THE MERGER
 
  Certain statements made in the following paragraphs regarding the potential
benefits that could result from the Merger are forward-looking statements
based on current expectations, and entail various risks and uncertainties that
could cause actual results to differ materially from those expressed in such
forward-looking statements. The potential benefits of the Merger may not be
realized. Such risks and uncertainties are set forth under "RISK FACTORS" and
elsewhere in this Proxy Statement/Prospectus. See "FORWARD-LOOKING
STATEMENTS."
 
  Quantum's Reasons for the Merger. The Board of Directors of Quantum has
unanimously approved the Merger and the Merger Agreement and has identified
several potential benefits of the Merger that they believe will contribute to
the success of the combined companies. These potential benefits include the
opportunity to (i) combine Quantum's autoloader products with ATL's tape
library products to offer one of the industry's most comprehensive lines of
tape automation products and (ii) leverage the combined marketing, product
development and distribution capabilities of the two companies. For these and
other reasons, Quantum believes that the Merger will help it to enhance its
market position with respect to a broad range of storage devices. See "THE
MERGER--Background of the Merger."
 
  ATL's Reasons for the Merger. The ATL Board has unanimously approved the
Merger Agreement and the Merger, and recommends that holders of shares of ATL
Common Stock vote for approval and adoption of the Agreement and Plan of
Reorganization and the Merger.
 
  The ATL Board believes that the Merger with Quantum will be beneficial to
ATL stockholders for the following reasons: (i) the combination of Quantum's
and ATL's tape automation systems businesses would allow the combined company
to offer one of the broadest and most comprehensive tape automation product
line in the industry; (ii) the integration of highly complementary technical
resources and personnel would enable the combined company to leverage
marketing, product development, distribution and support efforts; and
(iii) the combination with Quantum would create a combined company with
significantly greater resources, a more diversified product line and greater
financial and marketing resources than those of ATL alone, and would enhance
the competitive position of the combined company. The ATL Board also
considered the probable adverse impact on ATL's prospects as an independent
company in light of Quantum's expressed intention to enter the high
performance automated tape library business, either by acquisition or internal
development. Even
 
                                      33
<PAGE>
 
though the ATL Board believes that its automated tape library business is
media independent and that its products could be modified to incorporate tape
drive components other than the DLT drives manufactured exclusively by
Quantum, the ATL Board believed that some degree of uncertainty existed
concerning that product strategy. In particular, redesign and modification
would probably be conducted under potentially adverse circumstances, such as
potentially reduced access to Quantum's DLT drives, and with Quantum as a
possible new competitor, either directly or by virtue of Quantum's acquisition
of one of ATL's existing competitors. Against these considerations the ATL
Board weighed, among other things, the fact that the Exchange Ratio offered a
premium to ATL stockholders and, because the consideration was stock in the
continuing enterprise combining ATL and Quantum, that ATL's stockholders would
have the opportunity to benefit, on a tax deferred basis, from any growth to
be achieved by such combination, and participation in the execution of
Quantum's strategy to build an integrated storage systems enterprise.
 
  The ATL Board also considered, among other matters: (i) information
concerning Quantum's and ATL's respective businesses, prospects, financial
performance and condition, operations, technology, management and competitive
position; (ii) current financial market conditions and historical market
prices, volatility and trading information with respect to Quantum Common
Stock and ATL Common Stock; (iii) the consideration to be received by ATL
stockholders in the Merger and the relationship between the market value of
Quantum Common Stock to be issued in exchange for ATL Common Stock and ATL's
business, prospects, operations and financial condition; (iv) its belief that
the terms of the Agreement, including the parties' representations, warranties
and covenants, and the conditions to their respective obligations are
reasonable; (v) ATL's prospects as an independent company in a highly volatile
competitive environment; (vi) the potential for other third parties to enter
into strategic relationships with or to acquire ATL; (vii) the ability of ATL,
after receiving the advice of counsel that its fiduciary duties require it to
do so, to consider and negotiate other unsolicited, bona fide, superior
acquisition proposals and, in such event, to terminate the Agreement subject
to a payment of a fee to Quantum; and (viii) the financial presentations by
NationsBanc Montgomery, including its opinion (which concluded that the
Exchange Ratio is fair from a financial point of view to ATL's stockholders).
 
  In view of the variety of factors considered in connection with its
evaluation of the merger, the ATL Board did not find it practicable to and did
not quantify or otherwise assign relative weight to the specific factors
considered in reaching its determination. Individual members of the ATL Board
may have given different weight to different factors.
 
OPINION OF ATL'S FINANCIAL ADVISOR
 
  Pursuant to an engagement letter executed December 4, 1997 (the "Engagement
Letter"), the ATL Board retained NationsBanc Montgomery to act as its
financial advisor in connection with the Merger pursuant to the terms and
conditions of the Merger Agreement. NationsBanc Montgomery is a nationally
recognized investment banking firm and, as part of its activities, is
regularly engaged in the valuation of businesses and their securities in
connection with mergers and acquisitions, negotiated underwritings, secondary
distributions of listed and unlisted securities, private placements and
valuations for corporate and other purposes. ATL selected NationsBanc
Montgomery as its financial advisor on the basis of NationsBanc Montgomery's
experience and expertise in transactions similar to the Merger, its reputation
in the investment community and its historical investment banking relationship
with ATL.
 
  On May 18, 1998, NationsBanc Montgomery delivered to the ATL Board its oral
opinion, subsequently confirmed in writing as of the same date, that the
Exchange Ratio is fair, from a financial point of view as of that date, to the
holders of ATL's Common Stock pursuant to the Merger. The Exchange Ratio was
determined pursuant to negotiations between ATL and Quantum and not pursuant
to recommendations from NationsBanc Montgomery. No limitations were imposed by
the ATL Board on NationsBanc Montgomery with respect to the investigations
made or procedures followed in rendering its opinion. NationsBanc Montgomery
was not requested to, nor did it, assist ATL in soliciting indications of
interest from third parties for the acquisition of all or any part of ATL.
 
 
                                      34
<PAGE>
 
  THE FULL TEXT OF NATIONSBANC MONTGOMERY'S WRITTEN OPINION TO THE ATL BOARD
IS ATTACHED HERETO AS APPENDIX B AND IS INCORPORATED HEREIN BY REFERENCE AND
SHOULD BE READ CAREFULLY AND IN ITS ENTIRETY IN CONNECTION WITH THIS PROXY
STATEMENT/PROSPECTUS. THE FOLLOWING SUMMARY OF NATIONSBANC MONTGOMERY'S
OPINION IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO THE FULL TEXT OF THE
OPINION. NATIONSBANC MONTGOMERY'S OPINION IS DIRECTED TO THE ATL BOARD AND
DOES NOT CONSTITUTE A RECOMMENDATION TO ANY STOCKHOLDER AS TO HOW SUCH
STOCKHOLDER SHOULD VOTE WITH RESPECT TO THE MERGER. NATIONSBANC MONTGOMERY'S
OPINION ADDRESSES ONLY THE FINANCIAL FAIRNESS OF THE EXCHANGE RATIO PURSUANT
TO THE MERGER AND DOES NOT ADDRESS THE RELATIVE MERITS OF THE MERGER OR ANY
ALTERNATIVES TO THE MERGER, THE UNDERLYING DECISION OF THE ATL BOARD TO
PROCEED WITH OR EFFECT THE MERGER OR ANY OTHER ASPECT OF THE MERGER. IN
FURNISHING ITS OPINION, NATIONSBANC MONTGOMERY DID NOT ADMIT THAT IT IS AN
EXPERT WITHIN THE MEANING OF THE TERM "EXPERT" AS USED IN THE SECURITIES ACT,
NOR DID IT ADMIT THAT ITS OPINION CONSTITUTES A REPORT OR VALUATION WITHIN THE
MEANING OF THE SECURITIES ACT, AND STATEMENTS TO SUCH EFFECT ARE INCLUDED IN
THE NATIONSBANC MONTGOMERY OPINION.
 
  In connection with its opinion, NationsBanc Montgomery, among other things:
(i) reviewed certain publicly available financial and other data with respect
to ATL and Quantum, including the consolidated financial statements for recent
years and interim periods to June 30, 1997, interim unaudited financial
statements for the period to December 31, 1997 in respect of ATL and December
28, 1997 in respect of Quantum, and certain other relevant financial and
operating data relating to ATL made available to NationsBanc Montgomery from
published sources and from the internal records of ATL; (ii) reviewed the
financial terms and conditions of the Merger Agreement; (iii) reviewed certain
publicly available information concerning the trading of, and the trading
market for, the ATL Class A Common Stock and the Quantum Common Stock; (iv)
compared ATL from a financial point of view with certain other companies in
the storage component and system technology industries which NationsBanc
Montgomery deemed to be relevant; (v) considered the financial terms, to the
extent publicly available, of selected recent business combinations of
companies in the technology manufacturing, communications, network management,
semiconductor capital equipment and semiconductor device industries which
NationsBanc Montgomery deemed to be comparable, in whole or in part, to the
Merger; (vi) considered the premiums paid in comparable public market
acquisitions of selected businesses within the technology industry; (vii)
reviewed and discussed with representatives of the management of ATL certain
information of a business and financial nature regarding ATL, furnished to
NationsBanc Montgomery by them, including financial forecasts and related
assumptions of ATL; (viii) made inquiries regarding and discussed the Merger
and the Merger Agreement and other matters related thereto with ATL's counsel;
and (ix) performed such other analyses and examinations as NationsBanc
Montgomery deemed appropriate.
 
  In connection with its review, NationsBanc Montgomery did not assume any
obligation independently to verify the foregoing information and relied on its
being accurate and complete in all material respects. With respect to the
financial forecasts for ATL provided to NationsBanc Montgomery by ATL's
management, upon its advice and with the consent of the ATL Board, NationsBanc
Montgomery assumed for purposes of its opinion that the forecasts were
reasonably prepared on bases reflecting the best available estimates and
judgments of ATL's management at the time of preparation as to the future
financial performance of ATL and that they provide a reasonable basis upon
which NationsBanc Montgomery could form its opinion. ATL does not publicly
disclose internal management forecasts of the type provided to NationsBanc
Montgomery by the management of ATL in connection with its review of the
Merger. Such forecasts were not prepared with a view toward public disclosure.
In addition, such forecasts were based upon numerous variables and assumptions
that are inherently uncertain including, without limitation, factors related
to general economic and competitive conditions. Accordingly, actual results
could vary significantly from those set forth in such forecasts. NationsBanc
Montgomery has assumed no liability for such forecasts. NationsBanc Montgomery
also assumed that there have been no material changes in ATL's or Quantum's
assets, financial condition, results of operations, business or prospects
since the respective dates of their last financial statements made available
to NationsBanc Montgomery. NationsBanc Montgomery relied on advice of counsel
and independent accountants to ATL as to all legal and financial reporting
matters with respect to ATL, the Merger and the Merger Agreement. NationsBanc
Montgomery assumed that the Merger will be consummated in a manner that
complies in all respects with the
 
                                      35
<PAGE>
 
applicable provisions of the Securities Act, the Exchange Act and all other
applicable federal and state statutes, rules and regulations. In addition,
NationsBanc Montgomery did not assume responsibility for making an independent
evaluation, appraisal or physical inspection of any of the assets or
liabilities (contingent or otherwise) of ATL or Quantum; nor has NationsBanc
Montgomery been furnished with any such appraisals. The Board informed
NationsBanc Montgomery, and NationsBanc Montgomery has assumed, that the
Merger will be accounted for as a purchase transaction under generally
accepted accounting principles ("GAAP"). Finally, NationsBanc Montgomery's
opinion is based on economic, monetary and market and other conditions as in
effect on, and the information made available to NationsBanc Montgomery as of,
the date of the opinion. Accordingly, although subsequent developments may
affect its opinion, NationsBanc Montgomery has not assumed any obligation to
update, revise or reaffirm its opinion.
 
  Set forth below is a brief summary of the report presented by NationsBanc
Montgomery to the ATL Board on May 18, 1998 in connection with its opinion.
The Exchange Ratio in connection with the Merger was expected to yield an
acquisition price for ATL's Common Stock of $29.00 per share, subject to
measurement and adjustment as described in Section 1.6 of Article I of the
Merger Agreement.
 
  Comparable Company Analysis. Based on public and other available
information, NationsBanc Montgomery calculated the multiples of equity value
to estimated next twelve months ("NTM") net income for seven (7) companies in
the storage component and system technology industries. Such analysis
indicated a mean and median of NTM equity value to net income multiples of
22.2x and 17.5x, respectively. NationsBanc Montgomery noted that the Exchange
Ratio in connection with the Merger implied an equity value to net income
multiple of ATL Common Stock of 25.8x based on ATL's fiscal year 1999
estimated net income.
 
  Comparable Transactions Analysis. Based on public and other available
information, NationsBanc Montgomery calculated, to the extent possible, the
multiples of aggregate value to last twelve months ("LTM") revenues and equity
value to LTM net income for the target company implied in 22 acquisitions of
selected comparable companies in the technology manufacturing, communications,
network management, semiconductor capital equipment and semiconductor device
industries that have been announced since March 12, 1992. Such analysis
yielded the following multiples: a range of 1.1x to 35.1x LTM revenues, with a
mean of 5.7x and a median of 3.0x; and a range of 18.6x to 56.7x LTM net
income, with a mean of 36.2x and a median of 33.7x. NationsBanc Montgomery
noted that the equity value of ATL implied by the Exchange Ratio in connection
with the Merger yielded a multiple of 46.0x LTM net income, excluding non-
recurring items.
 
  No other company or merger used in the comparable company or comparable
transactions analysis as a comparison is identical to ATL or the Merger.
Accordingly, an analysis of the results of the foregoing is not mathematical;
rather, it involves complex considerations and judgments concerning
differences in financial and operating characteristics of the companies and
other factors that could affect the public trading value of the companies to
which ATL and the Merger are being compared.
 
  Discounted Cash Flow Analysis. NationsBanc Montgomery applied a discounted
cash flow analysis to the financial cash flow forecasts for ATL for five
fiscal years ending March 30, from fiscal year 1999 through fiscal year 2003,
as estimated by ATL's management. In conducting this analysis, NationsBanc
Montgomery first calculated the present values of the forecasted cash flows
through March 30, 2002. Second, NationsBanc Montgomery estimated the present
value of the terminal value of ATL at the end of fiscal year 2002 by applying
multiples to ATL's projected NTM net income at that time, which multiples
ranged from 15.0x to 19.0x. Such cash flows and terminal values were
discounted to present values using discount rates ranging from 20% to 40%,
chosen to reflect the opportunity costs and the risks inherent in the
technology industry. This analysis indicated a range of imputed equity values
of ATL of from $18.00 to $43.00 per share.
 
  Premiums Paid Analysis. Based on public and other available information,
NationsBanc Montgomery reviewed the consideration paid in 186 U.S.
acquisitions in the technology industry announced since June 28, 1990, with
particular emphasis on stock-for-stock transactions. NationsBanc Montgomery
calculated the premiums paid or offered in these stock-for-stock transactions
over the applicable stock price of the target
 
                                      36
<PAGE>
 
company one day, one week and four weeks prior to the announcement of the
acquisition offer. Such analysis indicated mean and median premiums,
respectively, of 30.0% and 28.3% for one day, 37.7% and 36.1% for one week,
and 43.5% and 43.2% for four weeks prior to the announcement of the
acquisition offer. NationsBanc Montgomery noted that the premiums implied by
the Merger were 49.6%, 47.7% and 60.0% for the period one day, one week and
four weeks prior to April 30, 1998, the last trading day prior to significant
increases both in the price of ATL Class A Common Stock and in its daily
trading volume. NationsBanc Montgomery believes that the increases might have
resulted from rumors regarding a possible transaction including ATL.
 
  Contribution Analysis. Using estimates and forecasts prepared by ATL with
respect to ATL, and based upon publicly available research reports with
respect to Quantum, NationsBanc Montgomery reviewed the estimated contribution
of each of ATL and Quantum to estimated fiscal years 1999 and 2000 revenue,
earnings before interest and taxes ("EBIT") and net income for the combined
company. NationsBanc Montgomery then compared such contributions to the pro
forma share ownership of the combined company to be owned by each of ATL and
Quantum, assuming consummation of the Merger as described in the Merger
Agreement. Such analysis indicated that ATL's stockholders would own
approximately 8.1% of the combined company on a pro forma basis. Such analysis
also indicated that, based on such estimates, ATL would contribute
approximately 3.0%, 6.9% and 6.7% of the combined company's estimated fiscal
1999 revenue, EBIT and net income, respectively, and 3.8%, 7.6% and 6.5% of
the combined company's estimated fiscal 2000 revenue, EBIT and net income,
respectively.
 
  Pro Forma Merger Analysis. Using estimates and forecasts prepared by ATL
with respect to ATL, and based upon publicly available research reports with
respect to Quantum, NationsBanc Montgomery compiled and reviewed pro forma
financial information of Quantum, assuming consummation of the Merger as
described in the Merger Agreement. Such analysis indicated that if Quantum
executed its announced stock repurchase plan at the then current price and
then purchased ATL's Common Stock at the Exchange Ratio, the Merger would
result in an earnings dilution of 11.5% to Quantum for fiscal year 1999.
 
  While the foregoing summary describes all analyses and examinations that
NationsBanc Montgomery deems material to its opinion, it is not a
comprehensive description of all analyses and examinations actually conducted
by NationsBanc Montgomery. The preparation of a fairness opinion necessarily
is not susceptible to partial analysis or summary description. NationsBanc
Montgomery believes that its analyses and the summary set forth above must be
considered as a whole and that selecting portions of its analyses and of the
factors considered, without considering all analyses and factors, would create
an incomplete view of the process underlying the analyses set forth in its
presentation to the ATL Board. In addition, NationsBanc Montgomery may have
given various analyses more or less weight than other analyses, and may have
deemed various assumptions more or less probable than other assumptions. The
fact that any specific analysis has been referred to in the summary above is
not meant to indicate that such analysis was given greater weight than any
other analysis. Accordingly, the ranges of valuations resulting from any
particular analysis described above should not be taken to be NationsBanc
Montgomery's view of the actual value of ATL.
 
  In performing its analyses, NationsBanc Montgomery made numerous assumptions
with respect to industry performance, general business and economic conditions
and other matters, many of which are beyond the control of ATL and Quantum.
The analyses performed by NationsBanc Montgomery are not necessarily
indicative of actual values or actual future results, which may be
significantly more or less favorable than those suggested by such analyses.
Such analyses were prepared solely as part of NationsBanc Montgomery's
analysis of the financial fairness of the Exchange Ratio pursuant to the
Merger and were provided to the ATL Board in connection with the delivery of
NationsBanc Montgomery's opinion. The analyses do not purport to be appraisals
or to reflect the prices at which a company might actually be sold or the
prices at which any securities may trade at any time in the future.
 
  As described above, NationsBanc Montgomery's opinion and presentation to the
ATL Board were among the many factors taken into consideration by the ATL
Board in making its determination to approve, and to recommend that ATL's
stockholders approve, the Merger.
 
                                      37
<PAGE>
 
  Upon execution of the Engagement Letter, ATL agreed to pay NationsBanc
Montgomery a retainer fee together with fee of between 0.8% and 2.0% of the
total consideration involved in the Merger, one-half of which was contingent
upon and to be paid upon the earlier of (i) the delivery by NationsBanc
Montgomery of its opinion or (ii) the execution of the Merger Agreement, with
the second half of the fee to be contingent on the consummation of the Merger.
The ATL Board was aware of this fee structure and took it into account in
considering NationsBanc Montgomery's opinion and in approving the Merger. The
Engagement Letter also calls for ATL to reimburse NationsBanc Montgomery for
its reasonable out-of-pocket expenses. Pursuant to a separate letter
agreement, ATL has agreed to indemnify NationsBanc Montgomery, its affiliates,
and their respective partners, directors, officers, agents, consultants,
employees and controlling persons against certain liabilities, including
liabilities under the federal securities laws.
 
  In the ordinary course of its business, NationsBanc Montgomery actively
trades the equity securities of ATL and Quantum for its own account and for
the accounts of customers and, accordingly, may at any time hold a long or
short position in such securities. NationsBanc Montgomery also acted as
underwriter in connection with the initial public offering of ATL's Class A
Common Stock and has performed various investment banking services for ATL.
 
CERTAIN FEDERAL INCOME TAX CONSIDERATIONS
 
  The following discussion addresses the material federal income tax
considerations of the Merger that are generally applicable to holders of ATL
Common Stock exchanging their ATL Common Stock for Quantum Common Stock.
Stockholders of ATL should be aware that the following discussion does not
deal with all federal income tax considerations that may be relevant to
particular ATL stockholders in light of their particular circumstances, such
as stockholders who are dealers in securities, who are foreign persons or who
acquired their ATL Common Stock through stock option or stock purchase
programs or in other compensatory transactions. In addition, the following
discussion does not address the foreign, state or local tax laws or tax
consequences of transactions effectuated prior to or after the Merger (whether
or not such transactions are in connection with the Merger) including, without
limitation, the exercise of options or rights to purchase ATL Common Stock in
anticipation of the Merger. ACCORDINGLY, ATL STOCKHOLDERS ARE URGED TO CONSULT
THEIR OWN TAX ADVISORS AS TO THE SPECIFIC TAX CONSEQUENCES TO THEM OF THE
MERGER, INCLUDING THE APPLICABLE FEDERAL, STATE, LOCAL AND FOREIGN TAX
CONSEQUENCES TO THEM OF THE MERGER.
 
  The following discussion is based on the Code, applicable Treasury
Regulations, judicial authority and administrative rulings and practice, all
as of the date hereof. The IRS is not precluded from adopting a contrary
position. In addition, there can be no assurance that future legislative,
judicial or administrative changes or interpretations will not adversely
affect the accuracy of the statements and conclusions set forth herein. Any
such changes or interpretations could be applied retroactively and could
affect the tax consequences of the Merger to Quantum, Merger Sub, ATL and/or
their respective stockholders.
 
  The Merger is intended to qualify as a reorganization under Section 368(a)
of the Code (a "Reorganization"). In the event the Merger so qualifies,
subject to the limitations and qualifications referred to herein:
 
    (a) No gain or loss will be recognized by the holders of ATL Common Stock
  upon the receipt of Quantum Common Stock solely in exchange for such ATL
  Common Stock in the Merger (except to the extent of cash received in lieu
  of fractional shares);
 
    (b) The aggregate tax basis of the Quantum Common Stock so received by
  stockholders of ATL in the Merger (including any fractional share of
  Quantum Common Stock not actually received) will be the same as the
  aggregate tax basis of the ATL Common Stock surrendered in exchange
  therefor;
 
    (c) The holding period of the Quantum Common Stock so received by each
  stockholder of ATL in the Merger will include the period for which the ATL
  Common Stock surrendered in exchange therefor was
 
                                      38
<PAGE>
 
  considered to be held, provided that the ATL Common Stock so surrendered is
  held as a capital asset at the Effective Time;
 
    (d) Cash payments received by holders of ATL Common Stock in lieu of
  receipt of a fractional share of Quantum Common Stock will be treated as if
  such fractional share of Quantum Common Stock had been issued in the Merger
  and then redeemed by Quantum, and a stockholder of ATL receiving such cash
  will generally recognize gain or loss upon such payment, measured by the
  difference (if any) between the amount of cash received and the basis in
  such fractional share; and
 
    (e) None of Quantum, Merger Sub or ATL will recognize gain or loss solely
  as a result of the Merger.
 
  Neither Quantum nor ATL has requested a ruling from the IRS in connection
with the Merger. As a condition to the consummation of the Merger, Quantum and
ATL will receive opinions from their respective counsel, Wilson Sonsini
Goodrich & Rosati, Professional Corporation, and Brobeck, Phleger & Harrison
LLP (the "Tax Opinions"), to the effect that, for federal income tax purposes,
the Merger will constitute a reorganization within the meaning of Section
368(a) of the Code. The Tax Opinions neither bind the IRS nor preclude the IRS
from adopting a contrary position. The Tax Opinions are subject to certain
assumptions and qualifications and will be based in part on the truth and
accuracy of certain representations of Quantum, ATL and Merger Sub.
 
  A successful IRS challenge to the Reorganization status of the Merger would
result in an ATL stockholder recognizing gain or loss with respect to each
share of ATL Common Stock surrendered equal to the difference between the
stockholder's basis in such share and the fair market value, as of the
Effective Time, of the Quantum Common Stock received in exchange therefor. In
such event, an ATL stockholder's aggregate basis in the Quantum Common Stock
so received would equal its fair market value, and the stockholder's holding
period for such stock would begin the day after the Merger.
 
  Even if the Merger qualifies as a Reorganization, a recipient of shares of
Quantum Common Stock would recognize gain to the extent that such shares were
considered to be received in exchange for services or property (other than
solely ATL Common Stock). All or a portion of such gain may be taxable as
ordinary income. Gain would also have to be recognized to the extent that an
ATL stockholder was treated as receiving (directly or indirectly)
consideration other than Quantum Common Stock in exchange for the ATL Common
Stock.
 
APPRAISAL RIGHTS
 
  Class A Common Stock. Both ATL and Quantum are incorporated in the State of
Delaware, and, accordingly, are governed by the provisions of the DGCL.
Pursuant to Section 262(b) of the DGCL, the holders of ATL Class A Common
Stock are not entitled to appraisal rights in connection with the Merger
because ATL Class A Common Stock is designated as a national market system
security on an interdealer quotation system by the NASD and such stockholders
will receive as consideration in the Merger only shares of Quantum Common
Stock (which shares will be designated as a national market system security on
an interdealer quotation system by the NASD at the closing of the Merger) and
cash in lieu of fractional shares. Accordingly, ATL stockholders who do not
wish to receive Quantum Common Stock in exchange for their shares of ATL Class
A Common Stock must liquidate their investment by selling their ATL Class A
Common Stock prior to the consummation of the Merger.
 
  Class B Common Stock. Holders of record of ATL Class B Common Stock who do
not vote in favor of the Merger and who otherwise comply with the procedures
set forth in Section 262 of the DGCL, and summarized herein, will be entitled
to have their shares of ATL Class B Common Stock appraised (the "Appraisal
Shares") and will receive a payment in cash for such shares ("Appraisal
Rights"). The failure of an ATL Class B stockholder to follow the appropriate
procedures set forth in Section 262 will result in the termination or waiver
of the stockholder's Appraisal Rights. A person having a beneficial interest
in shares of ATL Class B Common Stock held of record in the name of another
person, such as a broker or nominee, must
 
                                      39
<PAGE>
 
act promptly to cause the record holder to follow the steps summarized below
properly and in a timely manner to perfect Appraisal Rights.
 
  THE FOLLOWING DISCUSSION IS NOT A COMPLETE STATEMENT OF THE LAW PERTAINING
TO APPRAISAL RIGHTS UNDER THE DGCL AND IS QUALIFIED IN ITS ENTIRETY BY THE
FULL TEXT OF SECTION 262 WHICH IS REPRINTED IN ITS ENTIRETY AS APPENDIX C. ALL
REFERENCES IN SECTION 262 AND THIS SUMMARY TO A "STOCKHOLDER" OR "HOLDER" ARE
TO THE RECORD HOLDER OF THE SHARES OF ATL CLASS B COMMON STOCK AS TO WHICH
APPRAISAL RIGHTS ARE ASSERTED.
 
  Under the DGCL, holders of shares of ATL Class B Common Stock who follow the
procedures set forth in Section 262 will be entitled to have their Appraisal
Shares appraised by the Delaware Chancery Court and to receive payment in cash
of the "fair value" of such Appraisal Shares, exclusive of any element of
value arising from the accomplishment or expectation of the Merger, together
with a fair rate of interest, if any, as determined by such court.
 
  Under Section 262, where a proposed merger (like the Merger) is to be
submitted for approval at a meeting of stockholders, the corporation, must
notify each of its stockholders, as determined on the record date for such
meeting, not less than twenty (20) days prior to the meeting that appraisal
rights are available. The corporation must also include a copy of Section 262
in such notice.
 
  This Proxy Statement/Prospectus constitutes notice to the holders of ATL
Class B Common Stock of their Appraisal Rights as required by Section 262.
Section 262 is attached to this Proxy Statement/Prospectus as Appendix C. Any
ATL Class B stockholder who wishes to exercise his, her or its Appraisal
Rights, or who wishes to preserve his, her or its right to do so, should
review the following discussion and Appendix C carefully. Failure to comply
timely and properly with the procedures specified in Section 262 will result
in the loss of Appraisal Rights.
 
  A HOLDER OF APPRAISAL SHARES WISHING TO EXERCISE SUCH HOLDER'S APPRAISAL
RIGHTS MUST (i) NOT VOTE IN FAVOR OF THE MERGER AND (ii) DELIVER TO ATL PRIOR
TO THE VOTE ON THE MERGER AGREEMENT AT THE ATL SPECIAL MEETING TO BE HELD ON
SEPTEMBER 24, 1998, A WRITTEN DEMAND FOR APPRAISAL. A HOLDER OF APPRAISAL
SHARES WISHING TO EXERCISE SUCH HOLDER'S APPRAISAL RIGHTS MUST BE THE RECORD
HOLDER OF SUCH APPRAISAL SHARES ON THE DATE THE WRITTEN DEMAND FOR APPRAISAL
IS MADE AND MUST CONTINUE TO HOLD SUCH APPRAISAL SHARES OF RECORD UNTIL THE
CONSUMMATION OF THE MERGER. ACCORDINGLY, A HOLDER OF APPRAISAL SHARES WHO IS
THE RECORD HOLDER OF APPRAISAL SHARES ON THE DATE THE WRITTEN DEMAND FOR
APPRAISAL IS MADE, BUT WHO THEREAFTER TRANSFERS SUCH APPRAISAL SHARES PRIOR TO
THE CONSUMMATION OF THE MERGER, WILL LOSE ANY RIGHT TO APPRAISAL IN RESPECT OF
SUCH APPRAISAL SHARES. A PROXY OR VOTE AGAINST THE APPROVAL OF THE MERGER DOES
NOT IN ITSELF CONSTITUTE A DEMAND FOR APPRAISAL.
 
  Only a holder of record of Appraisal Shares is entitled to assert Appraisal
Rights for the Appraisal Shares registered in that holder's name. A demand for
appraisal should be executed by or on behalf of the holder of record, fully
and correctly, as such holder's name appears on such holder's stock
certificate. If the Appraisal Shares are owned of record in a fiduciary
capacity, such as by a trustee, guardian or custodian, execution of the demand
should be made in that capacity, and if the Appraisal Shares are owned of
record by more than one person as in a joint tenancy or tenancy in common, the
demand should be executed by or on behalf of all joint owners. An authorized
agent, including one or more joint owners, may execute a demand for appraisal
on behalf of a holder of record; however, the agent must identify the record
owner or owners and expressly disclose the fact that, in executing the demand,
the agent is agent for such owner or owners. A record holder such as a broker
who holds Appraisal Shares as a nominee for several beneficial owners may
exercise appraisal rights with respect to the Appraisal Shares held for one or
more beneficial owners while not exercising
 
                                      40
<PAGE>
 
such rights with respect to the Appraisal Shares held for other beneficial
owners; in such case, the written demand should set forth the number of
Appraisal Shares as to which appraisal is sought. When no number of Appraisal
Shares is expressly mentioned, the demand will be presumed to cover all
Appraisal Shares held in the name of the record owner. Stockholders who hold
their Appraisal Shares in brokerage accounts or other nominee forms and who
wish to exercise Appraisal Rights are urged to consult with their brokers to
determine the appropriate procedures for the making of a demand for appraisal
by such a nominee.
 
  ALL WRITTEN DEMANDS FOR APPRAISAL SHOULD BE SENT OR DELIVERED TO
ATL PRODUCTS, INC., 2801 KELVIN AVENUE, IRVINE, CALIFORNIA 92614, ATTENTION:
SECRETARY.
 
  Within ten (10) days after the consummation of the Merger, the Surviving
Corporation will provide notice of the date on which the Merger was
consummated to each stockholder who has properly asserted Appraisal Rights
under Section 262 and has not voted in favor of the Merger.
 
  Within 120 days after the consummation of the Merger but not thereafter, the
Surviving Corporation or any stockholder who has complied with the statutory
requirements summarized above may file a petition in the Delaware Chancery
Court demanding a determination of the fair value of the Appraisal Shares.
Accordingly, it is the obligation of the stockholders to initiate all
necessary action to perfect their Appraisal Rights within the time prescribed
in Section 262. At any time within sixty (60) days from the consummation of
the Merger, a stockholder may withdraw his, her or its demand for appraisal,
and accept the terms offered under the Merger Agreement.
 
  Within 120 days after the consummation of the Merger, any stockholder who
has complied with the requirements for exercise of Appraisal Rights will be
entitled, upon written request, to receive from the Surviving Corporation a
statement setting forth the aggregate number of Appraisal Shares and the
aggregate number of holders of such Appraisal Shares not voted in favor of the
Merger and with respect to which demands for appraisal have been received. The
Surviving Corporation must mail the statement within ten (10) days after it
has received a written request.
 
  If a petition for an appraisal is timely filed, after a hearing on such
petition, the Delaware Chancery Court will determine the stockholders entitled
to Appraisal Rights and will appraise the fair value of their Appraisal
Shares, exclusive of any element of value arising from the accomplishment or
expectation of the merge, together with a fair rate of interest, if any, to be
paid upon the amount determined to be the fair value. Stockholders considering
whether to seek appraisal should be aware that the fair value of their
Appraisal Shares as determined under Section 262 could be more than, the same
as or less than the value of the consideration they would receive pursuant to
the Merger Agreement if they did not seek appraisal of their Appraisal Shares.
Investment banking opinions as to fairness from a financial point of view are
not necessarily opinions as to fair value under Section 262. The Delaware
Supreme Court has stated that proof of value by any techniques or methods
which are generally considered acceptable in the financial community and
otherwise admissible in court should be considered in the appraisal
proceedings.
 
  The Delaware Chancery Court will determine the amount of interest, if any,
to be paid upon the amounts to be received by persons whose Appraisal Shares
have been appraised. The costs of the action may be determined by the Delaware
Chancery Court and taxed upon the parties as the Delaware Chancery Court deems
equitable. The Delaware Chancery Court may also order that all or a portion of
the expenses incurred by any stockholder in connection with an appraisal,
including, without limitation, reasonable attorneys' fees and the fees and
expenses of experts utilized in the appraisal proceeding, be changed pro rata
against the value of all the Appraisal Shares entitled to appraisal.
 
  Any holder of Appraisal Shares who had duly demanded an appraisal in
compliance with Section 262 will not, after the consummation of the Merger, be
entitled to vote the Appraisal Shares subject to such demand for any purpose
or be entitled to the payment of dividends or other distributions on those
Appraisal Shares (except
 
                                      41
<PAGE>
 
dividends or other distributions payable to holders of record of Appraisal
Shares as of a record date prior to the consummation of the Merger).
 
  If any stockholder who properly demands appraisal of his Appraisal Shares
under Section 262 fails to perfect, or effectively withdraws or loses, his,
her or its Appraisal Rights, the Appraisal Shares of such stockholder will be
converted into the right to receive the consideration receivable with respect
to such Appraisal Shares in accordance with the Merger Agreement. A
stockholder will fail to perfect, or effectively lose or withdraw his, her or
its right to appraisal if, among other things, no petition for appraisal is
filed within 120 days after the consummation of the Merger, or if the
stockholder delivers to the Surviving Corporation a written withdrawal of his,
her or its demand for appraisal. Any such attempt to withdraw an appraisal
demand more than sixty (60) days after the consummation of the Merger will
require the written approval of the Surviving Corporation.
 
  FAILURE TO FOLLOW THE STEPS REQUIRED BY SECTION 262 FOR PERFECTING APPRAISAL
RIGHTS MAY RESULT IN THE LOSS OF SUCH RIGHTS (IN WHICH EVENT A STOCKHOLDER
WILL BE ENTITLED TO RECEIVE THE CONSIDERATION RECEIVABLE WITH RESPECT TO SUCH
APPRAISAL SHARES IN ACCORDANCE WITH THE MERGER AGREEMENT). IN VIEW OF THE
COMPLEXITY OF THE PROVISIONS OF SECTION 262, ATL CLASS B STOCKHOLDERS WHO ARE
CONSIDERING OBJECTING TO THE MERGER SHOULD CONSULT THEIR OWN LEGAL ADVISORS.
 
                                      42
<PAGE>
 
                         TERMS OF THE MERGER AGREEMENT
 
  The following is a brief summary of certain provisions of the Merger
Agreement, a copy of which is attached as Appendix A to this Proxy
Statement/Prospectus and incorporated herein by reference. Such summary is
qualified in its entirety by reference to the Merger Agreement. Stockholders
of ATL are urged to read the Merger Agreement in its entirety for a more
complete description of the Merger. In case of any conflict between the Merger
Agreement and the summary set forth herein, the Merger Agreement will control.
 
THE MERGER
 
  The Merger Agreement provides that, following the approval and adoption of
the Merger Agreement by the stockholders of ATL and the satisfaction or waiver
of the other conditions to the Merger, Merger Sub will be merged with and into
ATL, with ATL continuing as the surviving corporation and becoming a wholly-
owned subsidiary of Quantum.
 
EFFECTIVE TIME
 
  Subject to the provisions of the Merger Agreement, Quantum, ATL and Merger
Sub shall cause the Merger to be consummated by the filing, as soon as
practicable on or after the Closing Date, of the Certificate of Merger with
the Secretary of State of the State of Delaware in accordance with the
relevant provisions of Delaware law. The Closing of the Merger shall take
place at the offices of Wilson Sonsini Goodrich & Rosati, Professional
Corporation, at a time and date to be specified by the parties, which shall be
no later than the second business day after the satisfaction or waiver of the
conditions set forth in the Merger Agreement, or at such other time, date and
location as the parties hereto agree in writing. The Closing is anticipated to
occur on or about September 30, 1998.
 
CONVERSION OF SHARES IN THE MERGER; ASSUMPTION OF OPTIONS
 
  Each share of ATL Common Stock issued and outstanding immediately prior to
the Effective Time, other than shares owned by Merger Sub, Quantum or any
wholly owned subsidiary of Quantum, will be canceled and extinguished and
automatically converted into the right to receive that number of shares of
Quantum Common Stock equal to the Exchange Ratio determined by dividing (i)
$29.00 by (ii) the Quantum Deemed Value (as defined below) (subject to
adjustment as described below) upon surrender of the certificate representing
such share of ATL Common Stock in the manner provided in the Merger Agreement
(or in the case of a lost, stolen or destroyed certificate, upon delivery of
an affidavit (and bond, if required)). However, each share of ATL Common Stock
held by ATL or owned by Merger Sub, Quantum or any direct or indirect wholly-
owned subsidiary of ATL or Quantum immediately prior to the Effective Time
shall be canceled and extinguished without any conversion thereof. For
purposes of the Merger Agreement, "Quantum Deemed Value" shall mean the
average closing price of Quantum Common Stock as reported on Nasdaq for the
period consisting of the 45 trading days ending on and including the fourth
trading day prior to the date of the ATL Special Meeting at which the Merger
is approved (such 45-day period to be referred to hereinafter as the "Pricing
Period"); provided, however, that the Quantum Deemed Value shall be subject to
adjustment as discussed below.
 
  Subject to the provisions below, the Quantum Deemed Value shall be reduced
(and the Exchange Ratio correspondingly increased) by an amount equal to 50%
of the excess, if any, of the Interim Price over the Adjusted Base Price
where, for purposes of such calculation, (i) the Interim Price shall be equal
to the average closing price of Quantum Common Stock as reported on Nasdaq for
the five (5) trading days beginning upon the commencement of the Pricing
Period (the "Interim Period") and (ii) the Adjusted Base Price shall be equal
to the average closing price of Quantum Common Stock as reported on Nasdaq for
the five (5) trading days ending on and including May 18, 1998 (such average
closing price to be referred to hereinafter as the "Unadjusted Base Price,"
and such five-day period referred to hereinafter as the "Base Period")
increased by the greater of (a) the percentage by which the average HDD Index
(as defined below) for the Interim Period exceeds the average of the HDD Index
for the Base Period or (b) the percentage by which the average of the Nasdaq
Composite Index
 
                                      43
<PAGE>
 
for the Interim Period exceeds the average of the Nasdaq Composite Index for
the Base Period; provided, however, that notwithstanding the foregoing, no
adjustment shall be made to the Quantum Deemed Value (c) if the Adjusted Base
Price is greater than or equal to the Interim Price, (d) if the Unadjusted
Base Price is greater than or equal to the Quantum Deemed Value (as calculated
prior to any adjustment pursuant to this paragraph) or (e) to the extent that
any adjustment to the Quantum Deemed Value pursuant to this paragraph would
cause such Quantum Deemed Value to be lower than the Unadjusted Base Price.
The "HDD Index" for any period shall equal the sum of the daily closing sale
prices per share of Seagate Technology Inc. and Western Digital Corp.
 
  Under the Merger Agreement, at the Effective Time, each ATL Stock Option
will be assumed by Quantum. Each Assumed Option will continue to have, and be
subject to, the same terms and conditions set forth in the applicable ATL
stock option plan, except that (i) each ATL Stock Option will be exercisable
(or will become exercisable in accordance with its terms) for the number of
whole shares of Quantum Common Stock equal to the product of the number of
shares of ATL Common Stock that were issuable upon exercise of such ATL Stock
Option immediately prior to the Effective Time multiplied by the Exchange
Ratio; (ii) the per share exercise price for the shares of Quantum Common
Stock issuable upon exercise of such assumed ATL Stock Option will be equal to
the quotient determined by dividing the exercise price per share of ATL Common
Stock at which such ATL Stock Option was exercisable immediately prior to the
Effective Time by the Exchange Ratio; and (iii) 50% of the unvested ATL Stock
Options held by persons other than certain executive officers named in the
Merger Agreement shall immediately vest at the Effective Time. The balance of
the unvested ATL Stock Options held by such person shall vest according to
such options' vesting schedule existing immediately prior to the Effective
Time.
 
  Each share of Common Stock, $0.0001 par value per share, of Merger Sub (the
"Merger Sub Common Stock") issued and outstanding immediately prior to the
Effective Time, shall be converted into one validly issued, fully paid and
nonassessable share of Common Stock, $0.0001 par value per share, of the
Surviving Corporation. Each certificate evidencing ownership of shares of
Merger Sub Common Stock shall continue to evidence ownership of such shares of
capital stock of the Surviving Corporation.
 
ADJUSTMENT OF EXCHANGE RATIO
 
  The Exchange Ratio shall be adjusted to reflect appropriately the effect of
any stock split, reverse stock split, stock dividend (including any dividend
or distribution of securities convertible into Quantum Common Stock or ATL
Common Stock), reorganization, recapitalization, reclassification or other
like change with respect to Quantum Common Stock or ATL Common Stock occurring
on or after the date hereof and prior to the Effective Time.
 
NO FRACTIONAL SHARES
 
  No fraction of a share of Quantum Common Stock will be issued by virtue of
the Merger, but in lieu thereof, each holder of shares of ATL Common Stock who
would otherwise be entitled to a fraction of a share of Quantum Common Stock
(after aggregating all fractional shares of Quantum Common Stock that
otherwise would be received by such holder) shall be entitled to receive from
Quantum an amount of cash (rounded to the nearest whole cent) equal to the
product of (i) such fraction and (ii) the Quantum Deemed Value.
 
  No later than five (5) days after the Closing, Quantum will file a
registration statement on Form S-8 to register the shares of Quantum Common
Stock issuable with respect to the Assumed Options.
 
EXCHANGE AGENT; PROCEDURES FOR EXCHANGE OF CERTIFICATES
 
  Quantum has designated Harris Trust Company of California to act as the
Exchange Agent under the Merger Agreement. As of the Effective Time, Quantum
will deposit with the Exchange Agent for the benefit of the
 
                                      44
<PAGE>
 
holders of shares of ATL Common Stock, certificates representing shares of the
Quantum Common Stock to be issued pursuant to the Merger in accordance with
the Merger Agreement.
 
  Promptly after the Effective Time, the Exchange Agent will send to each
person or entity who was, at the Effective Time, a holder of record of
certificates the shares represented by which were converted into the right to
receive Quantum Common Stock, a letter of transmittal which (a) will specify
that delivery of Quantum Common Stock will be effected and risk of loss and
title to such certificates will pass, only upon actual delivery of such
certificates to the Exchange Agent and (b) will contain instructions for use
in effecting the surrender of the certificates. Upon surrender to the Exchange
Agent of certificates for cancellation, together with such letter of
transmittal duly executed, such holder will be entitled to receive in exchange
(i) a certificate representing the number of whole shares of Quantum Common
Stock into which the ATL Common Stock represented by the surrendered
certificate was converted at the Effective Time, (ii) cash in lieu of any
fractional share of Quantum Common Stock and (iii) certain dividends and
distributions described in the next paragraph, and the certificates so
surrendered will then be canceled.
 
  No dividends or other distributions declared or made after the Effective
Time with respect to the Quantum Common Stock with a record date after the
Effective Time will be paid to any holder entitled by reason of the Merger to
receive Quantum Common Stock and no cash payment in lieu of a fractional share
of Quantum Common Stock will be paid to any such holder until such holder has
surrendered its certificates as described above. Subject to applicable law,
following surrender of any such certificate, such holder will be paid, in each
case, without interest, (a) the amount of any dividends or other distributions
previously paid with respect to the shares of Quantum Common Stock represented
by the Quantum certificate received by such holder and having a record date on
or after the Effective Time and a payment date prior to such surrender and (b)
at the appropriate payment date, or as promptly as practicable thereafter, the
amount of any dividends or other distributions payable with respect to such
shares of Quantum Common Stock and having a record date on or after the
Effective Time but prior to such surrender and a payment date on or after such
surrender.
 
  If any certificates representing shares of Quantum Common Stock or any cash
is to be issued or paid to any Person other than the registered holder of the
certificate surrendered in exchange therefor, it will be a condition to such
exchange that such surrendered certificate will be properly endorsed and
otherwise in proper form for transfer and such Person either (a) will pay to
the Exchange Agent any transfer or other taxes required as a result of the
issuance of such certificates of Quantum Common Stock and the distribution of
such cash payment to such Person or (b) will establish to the satisfaction of
the Exchange Agent that such tax has been paid or is not applicable. Quantum
or the Exchange Agent will be entitled to deduct and withhold from the
consideration payable pursuant to the Merger Agreement to any holder of ATL
Common Stock such amounts as Quantum or the Exchange Agent is required to
deduct and withhold with respect to the making of such payment under the Code,
or any provision of state, local or foreign tax law. To the extent that
amounts are so withheld by Quantum or the Exchange Agent, such withheld
amounts will be treated for all purposes of the Merger Agreement as having
been paid to the holder of the shares of ATL Common Stock in respect of which
such deduction and withholding was made by Quantum or the Exchange Agent. All
amounts in respect of taxes received or withheld by Quantum will be disposed
of by Quantum in accordance with the Code or such state, local or foreign tax
law, as applicable.
 
  At the close of business on the day on which the Effective Time occurs, the
stock transfer books of ATL will be closed and thereafter there will be no
further registration of transfers of shares of ATL Common Stock on the records
of ATL. From and after the Effective Time, the holders of shares of ATL Common
Stock outstanding immediately prior to the Effective Time will cease to have
any rights with respect to such shares except as otherwise provided herein or
by applicable law. After the Effective Time, and until surrendered for shares
of Quantum Common Stock as described above, Certificates which prior to the
Effective Time represented ATL Common Stock converted in the Merger will be
deemed for all purposes, other than the right to receive payments of dividends
and distributions and cash in lieu of any fractional share of Quantum Common
Stock, to represent only the right to receive, upon such surrender, the number
of shares of Quantum Common Stock into which such ATL Common Stock was
converted.
 
                                      45
<PAGE>
 
  STOCKHOLDERS OF ATL SHOULD NOT FORWARD THEIR CERTIFICATES WITH THE ENCLOSED
PROXY, NOR SHOULD THEY RETURN THEIR ATL CERTIFICATES TO THE EXCHANGE AGENT
UNTIL THEY HAVE RECEIVED A TRANSMITTAL LETTER.
 
OPERATIONS FOLLOWING THE MERGER
 
  Once the Merger is consummated, Merger Sub will cease to exist as a
corporation, and all of the business, assets, liabilities and obligations of
Merger Sub will be merged into ATL with ATL remaining as the Surviving
Corporation. Following the Merger, ATL will continue to operate independently
as a wholly-owned subsidiary of Quantum. The stockholders of ATL will become
stockholders of Quantum, and their rights as stockholders will be governed by
the Quantum Certificate of Incorporation, as amended, and the laws of the
State of Delaware.
 
REPRESENTATIONS AND WARRANTIES
 
  The Merger Agreement contains various representations and warranties of
Quantum, ATL and Merger Sub relating, among other things, to (a) their
incorporation, existence, good standing, corporate power and similar corporate
matters; (b) their capitalization; (c) their authorization, execution,
delivery and performance and the enforceability of the Merger Agreement and
related matters; (d) the absence of conflicts, violations and defaults under
their corporate charters and by-laws and certain other agreements and
documents; (e) their pending or threatened litigation; and (f) the absence of
any occurrence or event that could reasonably be expected to have a material
adverse effect on the assets, business, financial condition, operations or
prospects (a "Material Adverse Effect") of ATL, Quantum or Merger Sub, as
applicable.
 
  ATL has provided certain additional representations and warranties, relating
among other things, to (i) certain of its audited financial statements; (ii)
the absence of undisclosed liabilities; (iii) ownership of its properties;
(iv) material contracts and no defaults thereunder; (v) its licenses and
permits; (vi) its Intellectual Property Rights; (vii) tax matters; (viii) its
employee benefits plans; (ix) certain employee matters; (x) environmental
matters; (xi) capitalization of subsidiaries; (xii) the accuracy and
completeness of certain information provided to Quantum; (xiii) basis of
preparation of financial projections; and (xiv) accuracy and completeness of
information contained in this Proxy Statement/Prospectus.
 
  Quantum and Merger Sub have also provided certain additional representations
and warranties as to documents and reports filed by Quantum with the
Commission and the accuracy and completeness thereof.
 
  All representations and warranties of Quantum, ATL and Merger Sub expire at
the Effective Time.
 
CONDUCT OF QUANTUM'S AND ATL'S BUSINESS PRIOR TO THE MERGER
 
  During the period from the date of the Merger Agreement and continuing until
the earlier of the termination of the Merger Agreement pursuant to its terms
or the Effective Time, ATL has agreed (except to the extent that Quantum shall
otherwise consent in writing) to carry on its business and to cause its
subsidiaries to carry on their business in the ordinary course in
substantially the same manner as previously conducted and in compliance in all
material respects with all applicable laws and regulations, to pay their debts
and taxes when due (subject to good faith disputes over such debts or taxes),
to pay or perform other material obligations when due, and to use all
reasonable efforts consistent with past practice and policies to preserve
intact their present business organizations, keep available the services of
their present officers and key employees, and preserve their relationships
with customers, suppliers, distributors, licensors, licensees and others
having business dealings with them, all with the goal of preserving unimpaired
the goodwill and ongoing businesses of ATL and its subsidiaries at the
Effective Time. ATL shall promptly notify Quantum of any event which
materially adversely affects ATL, any of its subsidiaries, or their
businesses.
 
  In addition, notwithstanding the above, ATL shall not, nor shall ATL permit
any subsidiary to, do any of the following without the prior consent of
Quantum:
 
 
                                      46
<PAGE>
 
    (a) Waive any stock repurchase rights, accelerate, amend or change the
  period of exercisability of options or restricted stock, or reprice options
  granted under any employee, consultant, director or other stock plans or
  authorize cash payments in exchange for any options granted under any of
  such plans;
 
    (b) Grant any severance or termination pay to any officer or employee
  except pursuant to written agreements outstanding, or policies existing, on
  the date hereof and as previously disclosed in writing or made available to
  Quantum, or adopt any new severance plan;
 
    (c) Transfer or license to any person or entity or otherwise extend,
  amend or modify in any material respect any rights to ATL Intellectual
  Property, or enter into grants to future patent rights, other than non-
  exclusive licenses in the ordinary course of business and consistent with
  past practice;
 
    (d) Declare, set aside or pay any dividends on or make any other
  distributions (whether in cash, stock, equity securities or property) in
  respect of any capital stock or split, combine or reclassify any capital
  stock or issue or authorize the issuance of any other securities in respect
  of, in lieu of or in substitution for any capital stock;
 
    (e) Purchase, redeem or otherwise acquire, directly or indirectly, any
  shares of capital stock of ATL or its subsidiaries, except repurchases of
  unvested shares at cost in connection with the termination of the
  employment relationship with any employee pursuant to stock option or
  purchase agreements in effect on the date hereof;
 
    (f) Issue, deliver, sell, authorize, pledge or otherwise encumber or
  propose any of the foregoing of, any shares of capital stock or any
  securities convertible into shares of capital stock, or subscriptions,
  rights, warrants or options to acquire any shares of capital stock or any
  securities convertible into shares of capital stock, or enter into other
  agreements or commitments of any character obligating it to issue any such
  shares or convertible securities, other than the issuance delivery and/or
  sale of shares of ATL Common Stock pursuant to the exercise of stock
  options therefor outstanding as of the date of the Merger Agreement.
 
    (g) Cause, permit or propose any amendments to its Certificate of
  Incorporation, By-laws or other charter documents (or similar governing
  instruments of any of its subsidiaries);
 
    (h) Acquire or agree to acquire by merging or consolidating with, or by
  purchasing any equity interest in or a portion of the assets of, or by any
  other manner, any business or any corporation, partnership, association or
  other business organization or division thereof, or otherwise acquire or
  agree to acquire any assets which are material, individually or in the
  aggregate, to the business of ATL or enter into any material joint
  ventures, strategic partnerships or alliances;
 
    (i) Sell, lease, license, encumber or otherwise dispose of any properties
  or assets which are material, individually or in the aggregate, to the
  business of ATL, except sales of inventory in the ordinary course of
  business consistent with past practice;
 
    (j) Incur any indebtedness for borrowed money or guarantee any such
  indebtedness of another person, issue or sell any debt securities or
  options, warrants, calls or other rights to acquire any debt securities of
  ATL, enter into any "keep well" or other agreement to maintain any
  financial statement condition or enter into any arrangement having the
  economic effect of any of the foregoing other than (i) in connection with
  the financing of ordinary course trade payables consistent with past
  practice or (ii) pursuant to existing credit facilities in the ordinary
  course of business;
 
    (k) Adopt or amend any employee benefit plan or employee stock purchase
  or employee stock option plan, or enter into any employment contract or
  collective bargaining agreement (other than offer letters and letter
  agreements entered into in the ordinary course of business consistent with
  past practice with employees who are terminable "at will"), pay any special
  bonus or special remuneration to any director or employee, or increase the
  salaries or wage rates or fringe benefits (including rights to severance or
  indemnification) of its directors, officers, employees or consultants other
  than in the ordinary course of business, consistent with past practice, or
  change in any material respect any management policies or procedures;
 
    (l) Make any payments outside of the ordinary course of business in
  excess of $50,000;
 
 
                                      47
<PAGE>
 
    (m) Except in the ordinary course of business, materially modify, amend
  or terminate any material contract or agreement to which ATL or any
  subsidiary thereof is a party or waive, release or assign any material
  rights or claims thereunder;
 
    (n) Enter into any material contracts, agreements, or obligations
  relating to the distribution, sale, license or marketing by third parties
  of ATL's products or products licensed by ATL other than in the ordinary
  course of business consistent with past practice;
 
    (o) Materially revalue any of its assets or, except as required by GAAP,
  make any change in accounting methods, principles or practices;
 
    (p) Engage in any action that could reasonably be expected to cause the
  Merger to fail to qualify as a "reorganization" under Section 368(a) of the
  Code; or
 
    (q) Agree in writing or otherwise to take any of the actions described in
  (a) through (p) above.
 
  During the period from the date of the Merger Agreement and continuing until
the earlier of the termination of the Merger Agreement pursuant to its terms
or the Effective Time, Quantum shall not do any of the following without the
prior consent of ATL:
 
    (a) Declare, set aside or pay any dividends on or make any other
  distributions (whether in cash, stock, equity securities or property) in
  respect of any capital stock or split, combine or reclassify any capital
  stock or issue or authorize the issuance of any other securities in respect
  of, in lieu of or in substitution for any capital stock; provided, however,
  that Quantum may effect repurchases of up to 14,000,000 shares of its
  Common Stock in accordance with Rule 10b-18 under the Exchange Act or
  pursuant to private transactions;
 
    (b) Purchase, redeem or otherwise acquire, directly or indirectly, any
  shares of capital stock of Quantum or its subsidiaries, except repurchases
  of unvested shares at cost in connection with the termination of the
  employment relationship with any employee pursuant to stock option or
  purchase agreements in effect on the date hereof; provided, however, that
  Quantum may effect repurchases of up to 14,000,000 shares of its Common
  Stock in accordance with Rule 10b-18 under the Exchange Act or pursuant to
  private transactions;
 
    (c) Acquire or agree to acquire by merging or consolidating with, or by
  purchasing any equity interest in or a portion of the assets of, or by any
  manner, any business or any corporation, partnership, association or other
  business organization or division thereof, or otherwise acquire or agree to
  acquire any assets which are material, individually or in the aggregate, to
  the business of Quantum or enter into any material joint ventures,
  strategic partnerships or alliances; provided, however, that the foregoing
  restrictions shall only apply to the extent that the contemplated
  transaction could reasonably be expected to directly cause a delay of the
  consummation of the Merger;
 
    (d) Engage in any action that could reasonably be expected to cause the
  Merger to fail to qualify as a "reorganization" under Section 368(a) of the
  Code; or
 
    (e) Materially revalue any of its assets or, except as required by GAAP,
  make any change in accounting methods, principles or practices; provided,
  however, that the foregoing restrictions shall only apply to the extent
  that the contemplated transaction could reasonably be expected to directly
  cause a delay of the consummation of the Merger.
 
NO SOLICITATION
 
  Subject to the provisions of the Merger Agreement summarized in the next
following paragraph, from the date of the Merger Agreement until the earlier
of the Effective Date or the termination of the Merger Agreement pursuant to
its terms, neither ATL nor any of its subsidiaries will not, nor will they
authorize or permit any of their respective officers, directors, affiliates or
employees or any investment banker, attorney or other advisor or
representative retained by any of them to (i) solicit, initiate or encourage
the making, submission or announcement of any Acquisition Proposal (as
hereinafter defined), (ii) participate in any discussions or negotiations
with, or disclose any non-public information concerning ATL or any of its
subsidiaries to, or afford any access to the properties, books or records of
ATL or any of its subsidiaries to, or enter into any agreement or
 
                                      48
<PAGE>
 
understanding with, any person, entity or group (other than Quantum and its
affiliates, agents and representatives), in connection with any Acquisition
Proposal, (iii) engage in any discussions with any person with respect to any
Acquisition Proposal, except as to the existence of these provisions, (iv)
subject to the limitations set forth in the paragraphs below, approve, endorse
or recommend any Acquisition Proposal or (v) enter into any letter of intent
or similar document or any contract agreement or commitment contemplating or
otherwise relating to any Acquisition Transaction (as defined below);
provided, however, that prior to the approval of the Merger Agreement by the
required ATL stockholder vote, this shall not prohibit ATL from furnishing
nonpublic information regarding ATL and its subsidiaries to, entering into a
confidentiality agreement with or entering into discussions with, any person
or group in response to a Superior Proposal (as defined below) submitted by
such person or group (and not withdrawn) if (1) neither ATL nor any
representative of ATL and its subsidiaries shall have violated any of the
restrictions set forth herein, (2) the Board of Directors of ATL concludes in
good faith, after consultation with its outside legal counsel, that such
action is required in order for the Board of Directors of ATL to comply with
its fiduciary obligations to ATL's stockholders under applicable law, (3)
prior to furnishing any such nonpublic information to, or entering into
discussions with, such person or group, ATL gives Quantum written notice of
the identity of such person or group and of ATL's intention to furnish
nonpublic information to, or enter into discussions with, such person or group
and ATL receives from such person or group an executed confidentiality
agreement containing terms, conditions and limitations, substantially similar
to those contained in the Mutual Confidentiality Agreement, dated as of
November 21, 1997 between Quantum and ATL, on the use and disclosure of all
nonpublic written and oral information furnished to such person or group by or
on behalf of ATL, and (4) contemporaneously with furnishing any such nonpublic
information to such person or group, ATL furnishes such nonpublic information
to Quantum (to the extent such nonpublic information has not been previously
furnished by ATL to Quantum). ATL and its subsidiaries will immediately cease
any and all existing activities, discussions or negotiations with any parties
conducted heretofore with respect to any Acquisition Proposal. In addition to
the foregoing, ATL shall provide Quantum with at least forty-eight (48) hours
prior written notice of any meeting of ATL's Board of Directors at which ATL's
Board of Directors is reasonably expected to recommend, approve or authorize a
Superior Proposal and together with such notice a copy of the then-current
draft of the definitive documentation relating to such Superior Proposal.
 
  For purposes of the Merger Agreement, "Acquisition Proposal" means any offer
or proposal (other than an offer or proposal by Quantum) relating to any
Acquisition Transaction. For the purposes of the Merger Agreement,
"Acquisition Transaction" means any transaction or series of related
transactions other than the transactions contemplated by the Merger Agreement
involving: (i) any merger, consolidation, sale of substantial assets or
similar transactions involving ATL or any of its subsidiaries (other than
sales of assets or inventory in the ordinary course of business or as
permitted under the terms of the Merger Agreement), (ii) sale by ATL of any
shares of capital stock of ATL (including without limitation by way of a
tender offer or an exchange offer) except as may be permitted pursuant to
Article 4 of the Merger Agreement, (iii) the acquisition by any person of
beneficial ownership or a right to acquire beneficial ownership of, or the
formation of any "group" (as defined under Section 13(d) of the Exchange Act
and the rules and regulations thereunder) which beneficially owns, or has the
right to acquire beneficial ownership of, 10% or more of the then outstanding
shares of capital stock of ATL (except for acquisitions for passive investment
purposes of not more than 15% of the then outstanding shares of capital stock
of ATL only in circumstances where the person or group qualifies for and files
a Schedule 13G with respect thereto and does not become obligated to file a
Schedule 13D), (iv) any liquidation or dissolution of ATL, or (v) any public
announcement of a proposal, plan or intention to do any of the foregoing or
any agreement to engage in any of the foregoing.
 
  Notwithstanding the above provisions, nothing in the Merger Agreement
prevents the Board of Directors of ATL from withholding, withdrawing, amending
or modifying its recommendation in favor of the Merger if (i) a Superior
Proposal (as defined below) is made to ATL and is not withdrawn, (ii) neither
ATL nor any of its representatives shall have violated any of the restrictions
set forth above, and (iii) the Board of Directors of ATL or any committee
thereof concludes in good faith, after consultation with its outside counsel,
that, in light of such Superior Proposal, the withholding, withdrawal,
amendment or modification of such recommendation is required in order for the
Board of Directors of ATL or any committee thereof to comply with its
fiduciary
 
                                      49
<PAGE>
 
obligations to ATL's stockholders under applicable law. For purposes of the
Merger Agreement ("Superior Proposal") shall mean an unsolicited, bona fide
written offer made by a third party to consummate any of the following
transactions: (i) a merger, consolidation, business combination,
recapitalization, liquidation, dissolution or similar transaction involving
ATL pursuant to which the ATL stockholders immediately preceding such
transaction hold less than 50% of the equity interest in the surviving or
resulting entity of such transaction; (ii) a sale or other disposition by ATL
of assets (excluding inventory and used equipment sold in the ordinary course
of business) representing in excess of 50% of the fair market value of ATL's
business immediately prior to such sale, or (iii) the acquisition by any
person or group (including by way of a tender offer or an exchange offer or
issuance by ATL), directly or indirectly, of beneficial ownership or a right
to acquire beneficial ownership of shares representing in excess of 50% of the
voting power of the then outstanding shares of capital stock of ATL, on terms
that the Board of Directors of ATL determines, in its reasonable judgment,
after consultation with its financial advisor, to be more favorable to ATL
stockholders than the terms of the Merger; provided, however, that any such
offer shall not be deemed to be a "Superior Proposal" if any financing
required to consummate the transaction contemplated by such offer is not
committed and is not likely in the judgment of ATL's Board of Directors to be
obtained by such third party on a timely basis.
 
  In addition to the obligations of ATL as described above, ATL, as promptly
as practicable, will advise Quantum orally and in writing of any request for
non-public information which ATL reasonably believes could lead to an
Acquisition Proposal or of any Acquisition Proposal, or any inquiry with
respect to or which ATL reasonably should believe would lead to any
Acquisition Proposal; the material terms and conditions of such request,
Acquisition Proposal or inquiry; and the identity of the person or group
making any such request, Acquisition Proposal or inquiry. ATL will keep
Quantum informed in all material respects of the status and details (including
material amendments or proposed amendments) of any such request, Acquisition
Proposal or inquiry.
 
CONDITIONS TO THE MERGER
 
  The respective obligations of each party to the Merger Agreement to effect
the Merger are subject to the satisfaction at or prior to the Closing Date of
the following conditions: (i) the Merger Agreement and the Merger and other
transactions contemplated thereby shall have been approved and adopted by
ATL's stockholders by the requisite vote under applicable law and ATL's
Certificate of Incorporation; (ii) the SEC shall have declared the
Registration Statement effective and no stop order suspending the
effectiveness of the Registration Statement or any part thereof shall have
been issued and no proceeding for that purpose, and no similar proceeding in
respect of the Proxy Statement/Prospectus, shall have been initiated or
threatened in writing by the SEC; (iii) no governmental entity shall have
enacted, issued, promulgated, enforced or entered any statute, rule,
regulation, executive order, decree, injunction or other order (whether
temporary, preliminary or permanent) which is in effect and which has the
effect of making the Merger illegal or otherwise prohibiting consummation of
the Merger and all material foreign antitrust approvals required to be
obtained prior to the Merger in connection with the transactions contemplated
hereby shall have been obtained; (iv) Quantum and ATL shall each have received
written opinions from legal counsel to the effect that the Merger will
constitute a reorganization within the meaning of Section 368 of the Code; and
(v) the shares of Quantum Common Stock issuable to ATL stockholders pursuant
to Merger and such other shares required to be reserved for issuance in
connection with the Merger shall have been authorized for listing on Nasdaq
upon official notice of issuance.
 
  In addition, the obligation of ATL to consummate and effect the Merger shall
be subject to the satisfaction on or prior to the Closing Date of each of the
following conditions, any of which may be waived, in writing, exclusively by
ATL: (i) Each representation and warranty of Quantum and Merger Sub contained
in the Merger Agreement shall have been true and correct as of the date of the
Merger Agreement and shall be true and correct on and as of the Closing Date
with the same force and effect as if made on the Closing Date except for
changes contemplated by the Merger Agreement and for those representations and
warranties which address matters only as of a particular date (which
representations shall have been true and correct as of such particular date),
and except, with regard to the foregoing clauses, in such cases where the
failure to be so true and correct would not have a Material Adverse Effect on
Quantum (it being understood that, for purposes of determining the accuracy
 
                                      50
<PAGE>
 
of such representations and warranties, all "Material Adverse Effect"
qualifications and other qualifications based on the word "material" or
similar phrases contained in such representations and warranties shall be
disregarded and any update of or modification to the Quantum Schedules made or
purported to have been made after the date of the Merger Agreement shall be
disregarded) and ATL shall have received a certificate with respect to the
foregoing signed on behalf of Quantum by an authorized agent of Quantum; (ii)
Quantum and Merger Sub shall have performed or complied in all material
respects with all agreements and covenants required by the Merger Agreement to
be performed or complied with by them on or prior to the Closing Date, and ATL
shall have received a certificate to such effect signed on behalf of Quantum
by an authorized officer of Quantum; and (iii) no Material Adverse Effect with
respect to Quantum shall have occurred since the date of the Merger Agreement.
 
  Further, the obligations of Quantum and Merger Sub to consummate and effect
the Merger shall be subject to the satisfaction on or prior to the Closing
Date of each of the following conditions, any of which may be waived, in
writing, exclusively by Quantum: (i) each representation and warranty of ATL
contained in the Merger Agreement shall have been true and correct as of the
date of the Merger Agreement and (ii) shall be true and correct on and as of
the Closing Date with the same force and effect as if made on and as of the
Closing Date, except for changes contemplated by the Merger Agreement and for
those representations and warranties which address matters only as of a
particular date (which representations shall have been true and correct and
except, with regard to the foregoing clauses and, in such cases (other than
with respect to certain enumerated representations and warranties) where the
failure to be so true and correct would not have a Material Adverse Effect on
ATL as of such particular date (it being understood that, for purposes of
determining the accuracy of such representations and warranties, all "Material
Adverse Effect" qualifications and other qualifications based on the word
"material" or similar phrases contained in such representations and warranties
shall be disregarded and any update of or modification to ATL Schedules made
or purported to have been made after the date of the Merger Agreement shall be
disregarded) and Quantum shall have received a certificate with respect to the
foregoing signed on behalf of ATL by the Chief Executive Officer and the Chief
Financial Officer of ATL; (iii) ATL shall have performed or complied in all
material respects with all agreements and covenants required by the Merger
Agreement to be performed or complied with by it at or prior to the Closing
Date, and Quantum shall have received a certificate to such effect signed on
behalf of ATL by the Chief Executive Officer and the Chief Financial Officer
of ATL; (iv) no Material Adverse Effect with respect to ATL and the
Subsidiaries shall have occurred since the date of the Merger Agreement; (v)
each of the persons listed on Exhibit C-1 of the Merger Agreement shall have
entered into the Noncompetition Agreement and each of such agreements will be
in full force and effect as of the Effective Time; (vi) ATL shall have
obtained all consents, waivers and approvals required in connection with the
consummation of the transactions contemplated hereby in connection with the
agreements, contracts, licenses or leases set forth in the Merger Agreement;
and (vii) all actions necessary to extinguish and cancel all outstanding
Rights (as defined in that certain Rights Agreement (the "ATL Rights Plan")
dated as of March 11, 1998, between ATL and BankBoston, N.A., as Rights Agent,
as amended) or render such Rights inapplicable to the Merger shall have been
taken.
 
TERMINATION OF THE MERGER AGREEMENT
 
  The Merger Agreement may be terminated at any time prior to the Effective
Time, whether before or after the requisite approval of the stockholders of
ATL: (i) by mutual written consent duly authorized by the Boards of Directors
of Quantum and ATL; (ii) by either ATL or Quantum if the Merger shall not have
been consummated by November 18, 1998 for any reason; provided, however, that
the right to terminate the Merger Agreement shall not be available to any
party whose action or failure to act has been a principal cause of or resulted
in the failure of the Merger to occur on or before such date and such action
or failure to act constitutes a breach of any covenant set forth in this
Agreement; (iii) by either ATL or Quantum if a governmental entity shall have
issued an order, decree or ruling or taken any other action in any case having
the effect of permanently restraining, enjoining or otherwise prohibiting the
Merger, which order, decree or ruling is final and nonappealable; (iv) by
either ATL or Quantum if the required approvals of the stockholders of ATL
contemplated by the Merger Agreement shall not have been obtained by reason of
the failure to obtain the
 
                                      51
<PAGE>
 
required vote at a meeting of ATL's stockholders duly convened therefor or at
any adjournment thereof (provided that the right to terminate the Merger
Agreement for failure to obtain ATL stockholder approval shall not be
available to ATL where the failure to obtain approval of ATL's stockholders
shall have been caused by the action or failure to act of ATL in breach of any
covenant in the Merger Agreement); (v) by Quantum, if (a) the Board of
Directors of ATL shall have withheld, withdrawn or modified in a manner
adverse to Quantum its recommendation in favor of adoption and approval of the
Merger Agreement or the Merger, (b) ATL shall have failed to include in the
Proxy Statement/Prospectus the recommendation of the ATL Board in favor of the
Merger and the Merger Agreement, (c) a tender or exchange offer relating to
securities of ATL shall have been commenced by a person unaffiliated with
Quantum and ATL and the ATL Board fails to reaffirm its recommendation in
favor of the adoption and approval of the Merger Agreement and the approval of
the Merger within ten (10) business days after Quantum requests in writing at
any time that such recommendation be reaffirmed, (d) the ATL Board or any
committee thereof shall have approved or publicly recommended any Acquisition
Proposal; or (e) a tender or exchange offer relating to securities of ATL
shall have been commenced by a person unaffiliated with Quantum and ATL shall
not have sent to its security holders pursuant to Rule 14e-2 promulgated under
the Securities Act, within ten (10) business days after such tender or
exchange offer is first published sent or given, a statement disclosing that
ATL recommends rejection of such tender or exchange offer; (vi) by ATL, upon a
breach of any representation, warranty, covenant, or agreement on the part of
Quantum set forth in the Merger Agreement, or if any representation or
warranty of Quantum shall have become untrue, provided, that if such
inaccuracy in Quantum's representations and warranties or breach by Quantum is
curable by Quantum through the exercise of its commercially reasonable
efforts, then ATL may not terminate the Merger Agreement under this section
for thirty (30) days after notice from ATL of such breach, provided that
Quantum continues to exercise such commercially reasonable efforts to cure
such breach; (vii) by Quantum, upon a breach of any representation, warranty,
covenant or agreement on the part of the ATL set forth in the Merger
Agreement, or if any representation or warranty of ATL shall have become
untrue, provided, that if such inaccuracy in ATL's representations and
warranties or breach by ATL is curable by ATL through the exercise of its
commercially reasonable efforts, then Quantum may not terminate the Merger
Agreement under this section for thirty (30) days after notice from Quantum of
such breach, provided that ATL continues to exercise such commercially
reasonable efforts to cure such breach; (viii) by ATL, if the ATL Board or any
committee thereof shall have approved or publicly recommended any Superior
Proposal.
 
BREAK UP FEE
 
  If the Merger Agreement is terminated (i) by Quantum, because either (a) the
Board of Directors of ATL shall have withheld, withdrawn or modified in a
manner adverse to Quantum its recommendation in favor of adoption and approval
of the Merger Agreement or the Merger, (b) ATL shall have failed to include in
the Proxy Statement/Prospectus the recommendation of the ATL Board in favor of
the Merger and the Merger Agreement, (c) a tender or exchange offer relating
to securities of ATL shall have been commenced by a person unaffiliated with
Quantum and ATL and the Board of Directors of ATL fails to reaffirm its
recommendation in favor of the adoption and approval of the Merger Agreement
and the approval of the Merger within ten (10) business days after Quantum
requests in writing at any time that such recommendation be reaffirmed, (d)
the ATL Board or any committee thereof shall have approved or publicly
recommended any Acquisition Proposal, or (e) a tender or exchange offer
relating to securities of ATL shall have been commenced by a person
unaffiliated with Quantum and ATL shall not have sent to its security holders
pursuant to Rule 14e-2 promulgated under the Securities Act, within ten (10)
business days after such tender or exchange offer is first published sent or
given, a statement disclosing that ATL recommends rejection of such tender or
exchange offer; or (ii) by ATL, if the Board of Directors of ATL or any
committee thereof shall have approved or publicly recommended any Superior
Proposal, then ATL shall pay to Quantum an amount equal to $6.0 million in
immediately available funds.
 
  Payment of the $6.0 million fee described above shall not be in lieu of
damages incurred in the event of a willful breach of the Merger Agreement by
ATL.
 
  Except as set forth above, all fees and expenses incurred in connection with
the Merger Agreement and the transactions contemplated hereby shall be paid by
the party incurring such expenses whether or not the Merger
 
                                      52
<PAGE>
 
is consummated; provided, however, that Quantum and ATL shall share equally
all fees and expenses, other than attorneys' and accountants fees and
expenses, incurred in relation to the printing and filing of this Proxy
Statement/Prospectus (including any preliminary materials related thereto) and
the Registration Statement (including financial statements and exhibits) and
any amendments or supplements thereto.
 
FEES AND EXPENSES
 
  Except for printing expenses and filing fees, which will be shared equally,
Quantum and ATL will each pay its own costs and expenses in connection with
the Merger Agreement and the transactions contemplated thereby, whether or not
the Merger is consummated.
 
AMENDMENT
 
  The Merger Agreement may be amended by the parties thereto upon the taking
of requisite corporate action.
 
WAIVER
 
  At any time prior to the Effective Time, the Merger Agreement permits a
party by appropriate action, to extend the time for compliance by or waive
performance of any representation, warranty, agreement, condition or
obligation of any other party.
 
RELATED AGREEMENTS
 
  Voting Agreement. As an inducement to Quantum to enter into the Merger
Agreement, Kevin C. Daly, the Chief Executive Officer and President of ATL,
has entered into a Voting Agreement dated as of May 18, 1998 (the "Voting
Agreement") with Quantum, and, by executing the Voting Agreement, irrevocably
appointed Quantum's (or any nominee of Quantum) as his lawful attorney and
proxy. Such proxy gives Quantum's Board of Directors the limited right to vote
the shares of ATL Common Stock beneficially owned by Dr. Daly (including any
shares of ATL Common Stock that Dr. Daly acquires after the time he entered
into the Voting Agreement) (collectively, the "Shares").
 
  In exercising its right to vote the Shares as lawful attorney and proxy of
Dr. Daly, Quantum (or any nominee of Quantum) will be limited, at every ATL
stockholders meeting and every written consent in lieu of such meeting, to
vote the Shares (i) in favor of approval of the Merger and the Merger
Agreement and (ii) against approval of any proposal made in opposition to or
in competition with the consummation of the Merger and against any merger,
consolidation, sale of assets, reorganization or recapitalization with any
party other than Quantum and any liquidation or winding up of ATL. Dr. Daly
may vote his own shares himself on all other matters. The Voting Agreement
terminates upon the earlier to occur of (i) such date and time as the Merger
shall become effective in accordance with the terms and provisions of the
Merger Agreement or (ii) such date as the Merger Agreement shall be terminated
in accordance with its terms (the "Expiration Date"). Dr. Daly has agreed not
to transfer his Shares prior to the Expiration Date.
 
  Affiliate Agreements. ATL will use its commercially reasonable efforts to
deliver or cause to be delivered to Quantum, as promptly as practicable on or
following the date of the Merger Agreement, from each member of the ATL Board,
certain officers of ATL and certain stockholders of ATL (in the reasonable
judgment of ATL, affiliates of ATL within the meaning of Rule 145 promulgated
under the Securities Act (each an "ATL Affiliate")) an executed ATL Affiliate
Agreement that will be effective as of the Effective Time. Accordingly,
Quantum will be entitled to place appropriate legends on the certificates
evidencing any Quantum Common Stock to be received by an ATL Affiliate
pursuant to the terms of the Merger Agreement, and to issue appropriate stop
transfer instructions to the transfer agent for the Quantum Common Stock,
consistent with the terms of ATL Affiliate Agreement. Pursuant to such
agreements, such directors, officers and stockholders will have also
acknowledged the resale restrictions imposed by Rule 145 under the Securities
Act on shares of ATL Common Stock to be received by them in the Merger and
will have made certain representations pertaining to the
 
                                      53
<PAGE>
 
"continuity of interest" requirements so as to qualify the Merger as a
reorganization within the meaning of Section 368 of the Code.
 
  Noncompetition Agreements. It is a condition to the Merger that certain ATL
employees enter into Noncompetition Agreements for the benefit of Quantum and
the Surviving Corporation. The Noncompetition Agreements provide that, from
the Effective Date until the earlier of thirty-six (36) months after the
Effective Date and twelve (12) months from the date of such employee's
termination of employment by Quantum or any subsidiary of Quantum for any
reason, such employee shall not, directly or indirectly, engage or invest in,
own, manage, operate, finance, control or participate in the ownership,
management, operation, financing or control of, be employed by, associated
with, or in any manner connected with, lend his name or any similar name to,
lend his credit to, or render services or advice to, any business whose
products, product development, services or other activities compete in any
respect with the products, product development, services or other activities
of or offered by Quantum, as such existed at or before the Effective Date;
provided, however, that nothing in the Noncompetition Agreement shall prevent
such employee from owning as a passive investment less than 3% of the
outstanding shares of the capital stock of a publicly-held company if such
shares are actively traded on an established national securities market in the
United States. Notwithstanding the foregoing, in the event that the employee's
employment is terminated other than for Cause (as defined below), the
noncompetition period shall end six (6) months following the termination of
the employee's employment with the Quantum or ATL. For purposes of the
Noncompetition Agreement, "Cause" shall mean termination by Quantum or ATL (i)
because of the employee's commission of a felony involving moral turpitude,
(ii) the willful, unauthorized disclosure of Quantum's or ATL's trade secrets,
or (iii) following delivery to the employee of a written demand for
performance from Quantum or ATL which describes the basis for Quantum's or
ATL's belief that the employee has not substantially performed his duties, or
engaged in continued violations of his obligations to Quantum or ATL which are
demonstrably willful and deliberate on the employee's part.
 
                                      54
<PAGE>
 
                             OTHER RELATED MATTERS
 
REGULATORY MATTERS
 
  Consummation of the Merger is subject to compliance with the HSR Act. On
June 15, 1998, Quantum and ATL filed the notifications required under the HSR
Act, as well as certain information required to be furnished to the FTC and
the Antitrust Division. The waiting period applicable to the Merger under the
HSR Act expired on July 15, 1998. The Merger is also subject to satisfaction
of the requirements of federal securities laws and applicable securities and
"blue sky" laws of the various states.
 
ACCOUNTING TREATMENT
 
  The Merger is intended to qualify as a purchase for financial reporting
purposes in accordance with GAAP. On a preliminary basis, Quantum estimates
goodwill and other intangibles of approximately $130 million will result from
the Merger, which will result in annual amoritzation expense of approximately
$13 million (assuming an average life of ten years). Quantum expects to
recognize a significant charge upon closing of the Merger for acquired in-
process research and development.
 
NASDAQ LISTING
 
  It is a condition to the Merger that the shares of Quantum Common Stock to
be issued in connection with the Merger be approved for quotation on Nasdaq. A
notice of listing has been filed for listing such shares of Quantum Common
Stock on Nasdaq.
 
RESALES OF QUANTUM COMMON STOCK
 
  The shares of Quantum Common Stock issuable to stockholders of ATL upon
consummation of the Merger have been registered under the Securities Act. Such
shares may be freely traded without restriction by all former holders of ATL
Common Stock who (i) are not deemed to be "affiliates" of ATL at the time of
the ATL Special Meeting (as "affiliates" is defined for purposes of Rule 145
under the Securities Act) and (ii) who do not become "affiliates" of Quantum
after the Merger.
 
  Shares of Quantum Common Stock received by those stockholders of ATL who are
deemed to be affiliates of ATL may be resold without registration under the
Securities Act only as permitted by Rule 145 under the Securities Act or as
otherwise permitted under the Securities Act. The Merger Agreement requires
ATL to use its best efforts to cause its affiliates to enter into agreements
not to make any public sale of any Quantum Common Stock received upon
consummation of the Merger, except in compliance with Rule 145 under the
Securities Act. See "TERMS OF THE MERGER AGREEMENT--Related Agreements" above.
In general, Rule 145, as currently in effect, imposes restrictions on the
manner in which such affiliates may make resales of Quantum Common Stock that
such affiliate and others (including persons with whom the affiliates act in
concert) may sell within any three-month period. These restrictions will
generally apply for at least a period of one year after the Merger (or longer
if the person is an affiliate of Quantum).
 
  This Proxy Statement/Prospectus does not cover any resales of Quantum Common
Stock received by persons who are deemed to be affiliates of ATL.
 
                                      55
<PAGE>
 
            COMPARISON OF RIGHTS OF STOCKHOLDERS OF QUANTUM AND ATL
 
  After consummation of the Merger, the holders of ATL Common Stock who
receive Quantum Common Stock under the terms of the Merger Agreement will
become stockholders of the Quantum. As stockholders of ATL, their rights are
presently governed by Delaware law, by the ATL Certificate of Incorporation,
as amended (the "ATL Certificate"), and by ATL's By-laws (the "ATL By-laws").
As stockholders of the Quantum, their rights will be governed by Delaware law,
by Quantum's Certificate of Incorporation, as amended (the "Quantum
Certificate"), and by Quantum's By-laws, as amended (the "Quantum By-laws").
The following discussion summarizes the material differences between the
rights of holders of ATL Common Stock and holders of Quantum Common Stock and
differences between the charters and by-laws of ATL and Quantum. This summary
does not purport to be complete and is qualified in its entirety by reference
to the ATL Certificate and ATL By-laws, the Quantum Certificate and the
Quantum By-laws, and the relevant provisions of Delaware law.
 
  Special Meeting of the Stockholders. Under Delaware law, a special meeting
of stockholders may be called by the board of directors or by any other person
authorized to do so in the certificate of incorporation or the by-laws. The
ATL By-laws provide that special meetings of the stockholders may be called by
the President, by the Secretary at the request in writing of the President, by
a majority of the members of the Board of Directors or by the holders of at
least 20% of the total voting power of all outstanding shares of stock
entitled to vote. The Quantum By-Laws provide that special meetings of the
stockholders may be called by resolution of the Board of Directors or by the
holders of shares entitled to cast not less than 10% of the votes at a special
meeting of stockholders.
 
  Notice of Special Meeting. The ATL By-laws provide that as soon as
reasonably practicable after receipt of a request for a special meeting,
written notice, stating the place, date (which shall be not less than ten (10)
nor more than sixty (60) days from the date of the notice) and hour of the
special meeting and the purpose or purposes for which the meeting is called,
shall be given to each stockholder entitled to vote at such special meeting.
The Quantum By-laws provide that if a special meeting is called by any person
or persons other than the Board of Directors, the officer receiving the
request shall cause notice to be promptly given to the stockholders entitled
to vote. A meeting will be held not less than thirty-five (35) nor more than
sixty (60) days after the receipt of the request.
 
  Action by Written Consent of Stockholders. Under Delaware law, unless the
certificate of incorporation provides otherwise, any action to be taken by
stockholders may be taken without a meeting, without prior notice, and without
a vote, if the stockholders having the number of votes that would be necessary
to take such action at a meeting at which all stockholders were present and
voted consent to the action in writing. Neither the ATL Certificate nor the
Quantum Certificate eliminate actions by written consent of the stockholders.
 
  Stockholder Proposals for Meetings. The ATL By-laws provide that at any
meeting of the stockholders, to be timely, a stockholder's notice must be
delivered to or mailed and received at the principal place of business of the
corporation not less than thirty (30) days nor more than sixty (60) days prior
to the meeting; provided, however, that in the event that less than forty (40)
days notice or prior public disclosure of the date of the meeting is given or
made to stockholders, notice by the stockholder to be timely must be received
not later than the close of business on the tenth day following the day on
which such notice of the date of the meeting was mailed or such public
disclosure was made. The Quantum By-laws provide that, to be timely, a
stockholder's notice must be delivered to or mailed and received at the
principal place of business of the corporation not less than sixty (60) days
nor more than ninety (90) days prior to the meeting; provided, however, that
in the event that less than fifty (50) days notice or prior public disclosure
of the date of the meeting is given or made to stockholders, notice by the
stockholder to be timely must be received not later than the close of business
on the tenth day following the day on which such notice of the date of the
meeting was mailed or such public disclosure was made.
 
  Cumulative Voting. The ATL Certificate and By-laws do not provide for
cumulative voting in elections of directors. Without cumulative voting, the
holders of a majority of the shares present at any annual meeting will be able
to elect all of the directors to be elected at that meeting, and no person
could be elected without the
 
                                      56
<PAGE>
 
support of a majority of the stockholders. Thus, a person or persons holding
shares or proxies representing less than a majority of the shares present will
not be able to elect any directors as they might if cumulative voting were
applicable. The Quantum Certificate and the Quantum By-laws provide for
cumulative voting by stockholders in elections of directors. The Quantum
Bylaws require that timely notice be given of any stockholder's intention to
cumulate votes.
 
  Nominations for Board of Directors, Advance Notice of Stockholder Nominees
and Cumulative Voting. The ATL By-laws provide that nominations for election
to the Board of Directors must be made by the Board of Directors or by any
stockholder of any outstanding class of capital stock of the corporation
entitled to vote for the election of directors. Nominations, other than those
made by the Board of Directors of Quantum, must be preceded by notification in
writing received by the Secretary of the corporation not less than sixty (60)
days nor more than ninety (90) days prior to any meeting of stockholders
called for the election of directors. The Quantum By-laws provide that
nominations of persons for election to the Board of Directors of the
corporation, other than those made by or at the direction of the Board of
Directors, shall be made pursuant to timely notice in writing to the Secretary
of Quantum. Timely notice must also be given of any stockholder's intention to
cumulate votes in the election of directors at a meeting. In either case, to
be timely, a stockholder's notice is deemed delivered to or mailed and
received at the principal executive officers of the corporation not less than
twenty (20) days nor more than sixty (60) days prior to the meeting; provided,
however, that in the event less than thirty (30) days notice or prior public
disclosure of the date of the meeting is given or made to stockholders, notice
by the stockholder to be timely must be so received not later than the close
of business on the tenth day following the day on which such notice of the
date of the meeting was mailed or such public disclosure was made.
 
  Number of Directors. The ATL By-laws provide that the number of directors
shall be fixed from time to time by resolution of the ATL Board or by the
stockholders at an annual meeting of ATL, but in no event shall be less than
four nor more than seven. The ATL Board is currently fixed at five (5)
members. The Quantum By-laws provide that the number of directors shall be set
at seven and, thereafter, may be changed by a duly adopted amendment to the
Quantum Certificate or by an amendment to the Quantum By-laws adopted by the
vote or written consent of a majority of the stock issued and outstanding and
entitled to vote or by resolution of a majority of the Board of Directors.
 
  Removal of Directors. The ATL Certificate and By-laws do not address the
removal of directors. However, under Delaware law, any director or the entire
Board of Directors may be removed, with or without cause, by the holders of a
majority of the shares then entitled to vote at an election of directors
except in the case of a corporation with cumulative voting. Quantum's By-laws
provide for removal of directors consistent with Delaware law. Stockholders of
ATL are not entitled to cumulate their votes. Thus, any director or the entire
Board of Directors of ATL may be removed, with or without cause, by the
holders of a majority of the shares then entitled to vote in an election of
directors. Stockholders of Quantum are entitled to cumulative voting. If less
than the entire Board of Directors of Quantum is to be removed, no director of
Quantum may be removed without cause if the votes cast against his removal
would be sufficient to elect him if then cumulatively voted at an election of
the entire Board of Directors of Quantum. Accordingly, it is more difficult to
remove a director from Quantum's Board of Directors.
 
  Exculpation of Directors. Each of Quantum and ATL has included in its
Certificate of Incorporation a provision which eliminates the personal
liability of its directors from monetary damages resulting from a breach of
fiduciary duty as a director to the fullest extent permitted by the DGCL.
 
  Indemnification of Directors, Officers and Others. The ATL By-laws require
indemnification of its directors, officers, employees and agents to the
maximum extent and in the manner permitted by the DGCL. The Quantum By-laws
require indemnification of a director or officer if he acted in good faith and
in a manner he reasonably believed to be in or not opposed to the best
interests of the corporation, and, with respect to any criminal action or
proceeding, had no reasonable cause to believe his conduct was unlawful.
Pursuant to the Quantum By-laws, the termination of any action, suit, or
proceeding by judgment, order, settlement, conviction, or upon a plea of nolo
contendere or its equivalent, does not, of itself, create a presumption that
the person did
 
                                      57
<PAGE>
 
not act in good faith and in a manner which he reasonably believed to be in or
not opposed to the best interests of the corporation, and, with respect to any
criminal action or proceeding, had a reasonable cause to believe that his
conduct was unlawful.
 
  Amendment, Repeal of By-laws. Both the ATL Certificate and the Quantum
Certificate provide that the By-laws can be amended or repealed either by the
affirmative vote of the holders of a majority of the outstanding voting shares
or by the Board of Directors.
 
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<PAGE>
 
                    CERTAIN INFORMATION CONCERNING QUANTUM
 
  Quantum designs, develops, and markets information storage products,
including high-performance, high-quality half-inch cartridge tape drives, tape
media, tape autoloaders and libraries, hard disk drives and solid state disk
drives. The half-inch cartridge tape drives and solid state disk drives are
manufactured by the Company. The Company combines its engineering and design
expertise with the high-volume manufacturing capabilities of MKE, its
exclusive manufacturing partner, to produce high-quality hard disk drives. MKE
manufactures all of Quantum's hard disk drives. Quantum was incorporated as a
California corporation in February 1980, and reincorporated as a Delaware
corporation in April 1987. Quantum's principal executive offices are located
at 500 McCarthy Boulevard, Milpitas, California 95035, and its telephone
number is (408) 894-4000. See "INFORMATION INCORPORATED BY REFERENCE."
 
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<PAGE>
 
                      CERTAIN INFORMATION CONCERNING ATL
 
                                 ATL BUSINESS
 
  The following discussion contains forward-looking statements within the
meaning of Section 27A of the Securities Act and Section 21E of the Exchange
Act. These forward looking statements are subject to certain risks and
uncertainties that could cause actual results to differ materially from
historical results or anticipated results. See "FORWARD-LOOKING STATEMENTS."
 
GENERAL
 
  ATL designs, manufactures, markets and services automated magnetic tape
libraries used to manage, store and transfer data in networked computing
environments. ATL is a leading provider of DLT automated tape libraries for
the high end of the networked computing market (one terabyte capacity and
above). ATL's products provide high performance, reliable, cost effective and
scalable storage solutions for organizations requiring the backup, archival
and recovery of critical computer data.
 
  ATL's products incorporate DLT tape drives as well as ATL's proprietary
IntelliGrip cartridge handling system, providing end users with rapid and
reliable access to computer data across a wide variety of networks. ATL's
proprietary robotics system within each automated tape library provides
additional speed and reliability due to the accurate and timely manner in
which tape cartridges are loaded and unloaded into the DLT drives. ATL's
products are compatible with commonly used network operating systems,
protocols and topologies as well as with a broad range of storage management
software. In addition, these products are highly scaleable and permit flexible
configuration. For example, ATL's 2640 Series is capable of storing 9.2
terabytes of data as a standalone unit or up to 46 terabytes of data with the
SystemLink Option, which links up to five 2640 units together for larger
storage requirements.
 
INDUSTRY BACKGROUND
 
  Cartridge based magnetic tape has gained increased popularity for backing
up, archiving and recovering data in distributed computing environments due to
its cost effectiveness, high reliability and its ability to provide nearline
availability of data. Magnetic tape solutions have evolved considerably over
the past twenty years and have historically included two distinct
technologies: linear recording technology such as the 3480 and QIC which
provided high data integrity and rapid data accessibility but relatively low
storage density; and helical tape technology such as the 8 mm and 4 mm tape
systems which provided higher density, but generally resulted in lower data
transfer rates, increased maintenance requirements, less effective access to
random data and reduced data integrity.
 
  DLT, a tape format introduced by Digital Equipment Corporation in 1993 and
acquired by Quantum in 1994, incorporates the key advantages of linear
recording and helical tape technologies into a single technology. DLT is a
high performance, half inch, linear serpentine recording tape solution
designed to meet the capacity and reliability needs of high duty cycle
applications such as network server backup devices, midrange applications,
multimedia processes and online transactions. ATL believes DLT tape drives
offer certain performance, durability, error correction, cost and reliability
advantages over competitive technologies, including high speed data transfer
rates, greater capacity and better data integrity than other tape formats,
and, in general, represent a balance between price and performance for the
distributed computing environment.
 
  In selecting alternatives for the protection, management and storage of
data, network administrators are primarily concerned with providing a storage
solution that meets their own needs for availability and capacity. To provide
a complete storage solution, however, tape library systems must also meet the
demanding needs of users relying on the network on a continuing basis.
Therefore, key criteria used to evaluate storage alternatives also include the
following: (i) reliability of the mechanical assemblies which handle and
transport storage media, (ii) the degree of system automation, (iii) the
compatibility with existing network operating systems, protocols and
topologies, (iv) the expandability and upgradeability of the storage device
over time, (v) the expected life cycle of the product, and (vi) the physical
configuration of the equipment. All of these factors must be considered in the
context of the overall operational cost of a given storage system, which
includes both the upfront cost of a particular storage system, as well as the
annual cost of operating, maintaining and supporting the systems and its
users.
 
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<PAGE>
 
PRODUCTS
 
  ATL's product families consist of the 7100, the 520, the 2640 and the P1000
Automated DLT Library Series. Within each product family, customers may
specify the type and quantity of DLT drives, the maximum number of cartridges
and a number of interface options. ATL's products are compatible with major
hardware platforms including Sun Microsystems, DEC, Hewlett-Packard, IBM,
Auspex and Data General, and are supported by most major UNIX and NT storage
management software applications.
 
  ATL's products incorporate electromechanical and robotic systems under the
precise digital control of dedicated electronics utilizing the Motorola 68332
microcontroller. These electronics control the robot, load port, tape drives,
control panel, position sensors and environmental sensors. The products also
include a wide variety of SCSI-2 interfaces configured to meet specific needs
of end users. The wide SCSI-2 interface permits data transfer at rates up to
20 megabytes per second on each host connection. The assignment of the library
and drives among the SCSI interfaces may be selected at installation of the
products. The products permit sharing of the library among several hosts to
permit, for example, concurrent backup from several local area networks.
 
  All of ATL's current products are based upon DLT technology which is a high
performance, half inch, linear tape solution. ATL currently offers four series
of products with a range of performance characteristics: the 7100 Series, the
520 Series, the 2640 Series and the P1000 Series. All product series can be
configured utilizing either DLT 4000 or DLT 7000 drives.
 
 P1000 Series
 
  The P1000 Series is a compact DLT library series which can support up to 32
DLT tape cartridges and up to four DLT tape drives. The P1000 Series is ATL's
first library series to incorporate ATL's announced Prism Library
Architecture. ATL commenced shipments of the P1000 Series products in December
1997. The P1000, which is available in both standalone and rack-mount
configurations, offers a compact one terabyte solution with backup performance
up to 72 gigabytes per hour. The size and density of the P1000 Series products
permits effective integration with rack-mount servers with disk capacities of
150 gigabytes or greater. The Prism Library Architecture of the P1000 permits
efficient upgrades of the products to incorporate new features such as
FibreChannel interfaces as they become available at a system level by the use
of industry-standard PCI (Personal Computer Interconnect) electronic cards.
The P1000 is intended for modest size network applications which are
experiencing rapid growth. The P1000 is the first ATL library to incorporate a
fully-integrated touch screen control panel for both operational and service
functions and is supported by both Unix and NT storage management software
products. The P1000 Series products support "hot swap" of DLT drives for
enhanced system availability and are intended to support other advanced Prism
Library Architectures features as they become available. A fully configured
P1000 library achieving 2:1 data compression generally can backup a 150
gigabyte database in approximately one hour. The end user list prices for
products in the P1000 Series generally range from approximately $25,000 to
approximately $50,000 depending primarily upon drive configuration.
 
 7100 Series
 
  In March 1997, ATL commenced shipping of its 7100 Series, which affords a
cost effective solution for enterprise system administrators by providing
multi-terabyte backup and archiving capability in a compact system
configuration, with a high degree of commonality with the products in the 520
Series in terms of parts, operations and training. The 7100 Series was
designed for network environments requiring online disk capacities which will
exceed 250 gigabytes in the near future. The products in the 7100 Series are
particularly appropriate for environments which already contain products in
the 520 Series due to the high degree of operational and support compatibility
between these two product families. The 7100 Series also represents an
attractive choice for rapidly growing network environments as a result of the
relatively low entry costs of these products and the significant potential
offered for cost effective field upgrades.
 
  The 7100 Series currently includes twelve product configurations which
contain between two and seven DLT4000 or DLT7000 drives and are available with
either a 68 or 100 maximum cartridge capacity. The 7100 Series delivers
capacity ranging from 1.4 to 3.5 terabytes and backup performance of up to 126
gigabytes per
 
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<PAGE>
 
hour. A fully configured 7100 library achieving a 2:1 data compression
generally can backup a one terabyte database in only four hours. In addition,
the 7100 Series libraries can provide room for seven generations of a single
terabyte backup. The 7100 Series also includes several advanced features such
as a touch screen control panel with a browser-like GUI for "point-and-click"
library management as well as enhanced access to both the DLT drives and
cartridges. The 7100 Series will also permit "hot swap" of the DLT drives
during library operation to maximize library availability. The end user list
prices for products in the 7100 Series typically will from approximately
$65,000 to approximately $130,000 depending primarily on drive configuration.
 
 520 Series
 
  ATL introduced the 520 Series departmental libraries in 1995 for Unix
network environments. The 520 Series was designed specifically for the DLT
4000 and DLT 7000 drive technology. The 4/52 and 2/28 models of the 520 Series
are designed for the demanding networked computing environment. The 4/52
models primarily address high speed backup, archiving and hierarchical storage
management applications while the 2/28 models are used by companies making the
transition from single drive to multiple drive data storage management and are
easily upgradeable to address future requirements.
 
  The 520 Series currently includes sixteen product configurations which
contain either two or four DLT 4000 or DLT 7000 drives and are available with
either a 28 or 52 maximum cartridge capacity. The 520 Series delivers capacity
ranging from 0.6 to 1.8 terabytes and backup performance of up to 72 gigabytes
per hour. All of the products in the 520 Series have demonstrated extremely
high field reliability and have achieved DLT drive reliability which exceeds
the manufacturer's specifications. The end user list prices for products in
the 520 Series generally range from approximately $50,000 to approximately
$75,000 per library depending primarily on drive configuration.
 
 2640 Series
 
  The 2640 Series was ATL's first product family to incorporate DLT
technology. The 2640 was originally developed pursuant to a strategic alliance
with DEC in 1993. The basic architecture of the 2640 was adapted from ATL's
earlier developments in midrange 3480 and 3490 tape libraries. The 2640 Series
is sold primarily to the data intensive midrange segment of the market. The
2640 Series products are used by companies which require unattended backup of
large quantities of data in a safe, reliable manner and by organizations which
have migrated to more demanding HSM applications. The flexible design of the
2640 Series may be adapted to a variety of configurations to deal with large
amounts of data and is easily upgraded to meet future needs in terms of both
data capacity and transfer rate.
 
  Libraries in the 2640 Series are controlled by the host computer through
either an RS-232C or a SCSI-2 interface. Products in the 2640 Series may be
integrated into configurations of up to five units which can be operated as a
single library to accommodate significant growth in end user requirements. The
2640 Series currently includes nine product configurations which contain
between three and nine DLT 4000 or DLT 7000 drives and have maximum capacities
ranging from 88 to 264 cartridges. The 2640 Series delivers capacity ranging
from 1.8 to 9.2 terabytes per unit and backup performance of up to 162
gigabytes per hour per unit. End user configurations of up to five units in
the 2640 Series can be created with the SystemLink option either at system
installation, or at a later time as requirements grow. The end user list
prices for products in the 2640 Series generally range from approximately
$75,000 to approximately $155,000 depending primarily on drive configuration.
 
PRODUCTS UNDER DEVELOPMENT
 
  The P1000 and all of ATL's products introduced subsequent to the P1000 are
expected to be compatible with the Prism Library Architecture. Each of the
Prism products will include a high performance, industry standard PCI bus, to
address both the emerging NT market and large data mining and warehousing
applications. ATL is developing future versions within this product family
which are designed to increase speed and cartridge capacity and to enhance
their integration into both high end network and data archiving applications.
Prism
 
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<PAGE>
 
products are being developed in close cooperation with existing and potential
OEM customers and should provide substantially enhanced compatibility with a
wide range of hardware and software interfaces. Current automated tape library
architectures are restricted by the SCSI-2 specification which limits the
integration of these products into complex systems and network topologies. The
Prism architecture permits remote monitoring and management of libraries
distributed throughout an enterprise, provide interface flexibility for a wide
range of network and channel protocols (including SCSI, FDDI, FC/AL and ATM),
and facilitate a much closer integration between the library and other
elements of the storage management system. These products will also provide
significant added value opportunities for ATL's OEM partners. ATL's statements
concerning the timing of the introduction of the initial Prism product and the
capabilities of the Prism series are intended to be forward looking statements
and actual results may differ as a result of various risks, including but not
limited to, management's allocation of research and development resources,
unforeseen defects in the new architecture and the performance of ATL's
suppliers.
 
  P3000 Series. ATL is developing a new enterprise-class DLT library
incorporating the Prism Library Architecture called the P3000 series. The
P3000 is intended to be the industry's first High Availability ("HA") DLT
library offering such advanced features as redundant hot swap power supplies,
fan modules and DLT drives. The P3000 will support up to sixteen DLT drives
and 320 DLTtape cartridges. The P3000 is intended to support high performance
applications with a high availability, high throughput DLT solution. A fully
configured P3000 will have a native capacity of 11.2 terabytes and can achieve
backup performance of over one-half terabyte per hour with 2:1 data
compression. Libraries in the P3000 Series should be able to be integrated
into string of up to five units providing over 50 terabytes of native storage
capacity. The P3000 is expected to be fully compatible with the Prism Library
Architecture for both advanced functionality and enhanced interface
flexibility. ATL anticipates the P3000 will be available to customers in the
fourth calendar quarter of 1998.
 
  L500 Series. In order to provide a DLT library product for the low-end Unix
market and the entry-level NT market, ATL is working with Quantum to qualify
the Quantum Gemini DLT(TM)Stor product as the ATL PowerStor L500 DLT Library.
With one to three DLT drives and up to fourteen cartridges, the L500 will
complement ATL's other library series by providing an entry-level library
product, positioned below ATL's P1000. The Quantum product has been under
development for a considerable period of time, and ATL believes that, in
cooperation with Quantum, it should be able to complete the development and
qualification process and provide the L500 for customer shipments in the
second quarter of 1998.
 
  Software Enhancements. ATL is developing additional software elements to
complement its automated tape libraries and to enhance their functionality in
system monitoring and volume management. These proprietary software elements
are designed to comply with industry standard application programming
interfaces, including SNMP and JMAPI, and will provide remote access for
system monitoring and management within the internal network and across the
Internet.
 
RESEARCH AND DEVELOPMENT
 
  Research and development expense aggregated $8.4 million, $5.7 million, and
$1.7 million in fiscal 1998, 1997 and 1996, respectively. ATL's research and
development efforts are principally focused on the development of new
generations of storage products for the networked computer market. ATL employs
82 engineers and maintains key design teams in the areas of electromechanical,
electronic, software, system and process design. ATL has also engaged a number
of third parties for product development activities. In addition, ATL
continuously solicits and receives consultation from its end users regarding
system features and capabilities, and works closely with its OEMs during the
development and integration of the OEM products.
 
  ATL intends to focus its development activities to continue to accommodate
advances in DLT technology for integration into ATL's current products. As a
leading supplier of DLT libraries, ATL was able to work closely with Quantum
during the early stages of the development of the DLT 7000 drive which
facilitated ATL's rapid development of products using this technology. While
all of ATL's products currently feature DLT technology, ATL believes the
continued system evolution in the networked computing market has led to an
increasing need for automated tape libraries which provide functional
capabilities beyond those available with
 
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<PAGE>
 
current DLT technology. Accordingly, ATL continues to evaluate emerging drive
technologies which it believes will complement DLT.
 
  Recently Quantum announced that the next generation of DLT technology, super
DLT, will become available in the second half of 1999. As a result, ATL
anticipates significant research and development activity to support that
technology beginning in the fourth quarter of fiscal year 1999.
 
  ATL has gained significant expertise in the development of automated tape
libraries which extends beyond DLT technology and includes, among other
things, process automation knowledge and systems design. ATL intends to
continue to leverage this expertise to support the development of additional
removable storage media technologies which it anticipates will play an
important role in the distributed computer market. ATL believes this
expertise, together with its experience with a wide variety of tape media,
will enable ATL to adapt its products to accommodate evolving storage
technologies; however, there can be no assurance that ATL will be able to make
such adaptations on a timely basis, if at all.
 
  ATL believes that, in order to provide comprehensive solutions for the
emerging requirements of storage management, it must also design and introduce
tape libraries that incorporate embedded firmware and software to further
support archiving, data warehousing and HSM applications. ATL has and
continues to develop software elements which will complement the use of its
products in the Unix market and which will enhance the introduction of its
products into the rapidly developing NT market. These permit monitoring and
management of ATL's products either within a network structure or through
resources such as an enterprise wide intranet and the Internet, and should
substantially improve the efficiency and effectiveness of the use of multiple
libraries within a single organization. In addition, these products will
permit volume management of libraries without requiring extensive backup,
archiving or HSM applications, thereby making the products more attractive for
smaller scale networks, representing a majority of the NT installations.
 
  The data storage market is characterized by rapid technological change and
is highly competitive with respect to product innovation and introduction. ATL
believes its continued success depends in part on its ability to enhance its
existing products and develop new products that incorporate the latest
technological advancements. While ATL intends to continue to make significant
investments in research and development, there can be no assurance that it
will be able to modify its existing products or introduce new products which
incorporate new storage technology on a timely basis, if at all.
 
COMPETITION
 
  The market for ATL's products is highly competitive and is characterized by
rapidly changing technology and evolving standards. ATL believes that its
ability to compete depends on a number of factors, including the success and
timing of new product development by ATL and its competitors, compatibility of
ATL's products with a broad range of computing systems, product performance,
reliability and price, and customer support. ATL believes that the principal
competitive factors in the networked computing market are storage capacity,
data transfer rate, low cost of ownership, price, product quality and
reliability, timing of new product introductions and the flexibility to meet
customer demand expectations.
 
  ATL's principal competitors include the following manufacturers of DLT based
products: Advanced Digital Information Corporation ("ADIC"), Breece Hill
Technologies, Hewlett-Packard, Overland Data and StorageTek. ATL also competes
indirectly with a large number of manufacturers offering tape storage systems
using formats other than DLT including 8 mm, 4 mm (DAT), 3480 and QIC that
have larger installed bases and may be expected to continue to provide intense
competition for the DLT format. These competitors include ADIC, Exabyte,
Fujitsu, Hitachi, IBM, Spectra Logic and StorageTek. ATL anticipates these
competitors will expand the functionality and performance of their selected
storage technologies to compete effectively with DLT. In addition, if DLT
continues to maintain market acceptance, many of these competitors could elect
to offer DLT systems. ATL also expects increased competition from large
integrated computer equipment companies, many of whom have historically
incorporated their own tape storage products into their mainframe systems, and
are
 
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<PAGE>
 
broadening their focus to include the distributed computing market. Increased
competition is likely to result in price reductions, reduced gross margins and
loss of market share, all of which could have a material adverse effect on
ATL's business, financial condition and results of operations.
 
  Many of ATL's current and potential competitors have substantially greater
name recognition and financial, marketing, technical and other resources than
ATL. ATL's current and potential competitors may develop new technologies and
products that are more effective than ATL's products. In addition, many of
these companies sell directly to end users, which ATL believes may provide a
competitive edge over ATL when marketing either similar products or
alternative data storage solutions. There can be no assurance that ATL will be
able to compete successfully against either current or potential competitors
or that competition will not have a material adverse effect on ATL's business,
operation results and financial condition.
 
SALES AND MARKETING; PRINCIPAL CUSTOMERS
 
  ATL markets and sells its products through indirect sales channels comprised
primarily of VARs and OEMs pursuant to strategic arrangements and individual
purchase agreements. Sales of new technological advancements are often
initially made through VARs who generally evaluate, integrate and adopt new
technology more quickly than OEMs. As a technology achieves greater market
acceptance, OEM sales generally have represented an increased portion of the
sales of the products incorporating that technology. During the year ended
March 31, 1998, direct sales to VARs and OEMs each accounted for approximately
50% of ATL's total net product sales. In addition, a small number of customers
have historically accounted for a substantial proportion of ATL's net sales in
recent periods, and the identity of such significant customers changes from
period to period. Sales to EMC, DEC and Sun Microsystems accounted for
approximately 8.2%, 13.2% and 16.3%, respectively, of ATL's total net sales
for the year ended March 31, 1998 and 9.9%, 8.9%, and 3.7%, respectively, for
the year ended March 31, 1997. No other customer accounted for 10% or more of
ATL's total net sales for these periods.
 
  ATL has relationships with selected VARs who integrate ATL's products with
storage management software to provide comprehensive storage solutions. ATL
has certified approximately 35 independent software developers including EMC,
Hewlett-Packard, Legato, OpenVision, Spectralogic and Workstation Solutions,
among others, who provide storage management software which is compatible with
ATL's products. ATL's strategy is to pursue VARs who have expertise in storage
management, strong established relationships with end users and the experience
to understand and respond to their customers' critical needs. ATL typically
enters into a one year Reseller Agreement with its VARs, which are usually
subject to cancellation by ATL in the event the VAR does not meet certain
requirements. ATL provides marketing and training support for its VARs and
offers cooperative marketing programs to certain VARs.
 
  ATL has also entered into agreements with several major OEMs, including,
among others, DEC, EMC and Sun Microsystems, who incorporate ATL's products
into systems sold by the OEMs. ATL has entered into strategic relationships
with certain of these OEMs which has enabled ATL to work with such OEMs early
in their product development cycle thereby providing valuable development
feedback to ATL. The sales cycle for OEMs often encompasses a long lead time
and generally involves extensive product and system qualification, evaluation,
integration and verification. ATL believes the OEM channel is also critical to
ATL's success because OEMs have traditionally taken a more active role in the
development, support and servicing of ATL's products.
 
  ATL maintains full time sales personnel in five regional sales locations in
Boston, Chicago, Atlanta, San Francisco and Washington to facilitate close
cooperation and communication with its VAR and OEM customers. ATL also employs
an international sales staff which assists in the marketing of ATL's products
to VARs and OEMs throughout Europe and Asia. International sales constituted
approximately 25% of ATL's total net sales during the year ended March 31,
1998 compared to 21% in the comparable prior year period. ATL anticipates that
international sales will continue to represent a significant portion of ATL's
total net sales. ATL undertook a sales initiative for Europe in late fiscal
1995 and fiscal 1996 utilizing the pre-existing infrastructure of a European
sales subsidiary of Odetics, which offered products manufactured by other
business units of Odetics. In order to establish a European presence dedicated
solely to expanding the sales of ATL's products, ATL formed ATL
 
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<PAGE>
 
Products Limited in the United Kingdom to conduct its European operations. In
March 1998, ATL opened a new branch office in Japan and a new subsidiary in
Australia in order to support business opportunities in Asia Pacific. Sales to
customers outside the United States are subject to certain risks.
 
CUSTOMER SERVICE AND SUPPORT
 
  The quality and reliability of ATL's products and the ongoing support of
these products is a key element of ATL's business. All of ATL's products
include a one year warranty which provides on-site customer assistance on the
next business day in the United States. In addition, warranty coverage may be
upgraded to include on-site customer assistance with a four hour response
time, which assistance is available 24 hours per day, seven days a week.
 
  ATL maintains two dedicated service centers and has qualified more than 30
of its VAR and OEM customers as certified maintenance providers ("CMPs") to
service and provide support for ATL's products. ATL provides a formal training
program for its OEMs, VARs and CMPs. The CMPs often provide the initial on-
site response for on-site repairs, typically replacing parts and possibly even
reconfiguring the systems. The CMPs also gather critical data at each call
which enables ATL to continue to monitor its robotics systems. To supplement
its own domestic field service program, ATL has contracted with a national
organization to provide on-call field service to ATL's customers.
 
MANUFACTURING
 
  ATL manufactures all of its tape libraries at its facility in Irvine,
California. ATL's corporate headquarters and manufacturing facilities are
included within a 120,000 square foot facility, of which approximately 50,000
square feet is allocated to manufacturing. ATL currently operates four
assembly lines during one daily eight hour shift.
 
  ATL manufactures the robotics subassemblies used in its automated tape
libraries and performs final assembly and testing of purchased components.
ATL's manufacturing processes consist primarily of final systems integration
and quality assurance. A significant portion of the manufacturing process
consists of quality assurance and testing which is conducted on a 24 hour
basis. ATL depends, to a large degree, on outside suppliers to provide most of
the components incorporated in ATL's products including the DLT drives,
circuit boards, moldings and chassis. ATL intends to continue to outsource as
much of the manufacturing as possible in order to maximize manufacturing
flexibility. While many of the parts and components used in ATL's products are
available from a number of fabricators in California, the DLT drives are
available only from a single supplier, Quantum. Quantum may terminate its
agreement with ATL for any reason upon 90 days notice. Any disruption in ATL's
relationship with Quantum would have a material adverse effect on ATL's
business, financial condition and results of operations. In addition, ATL
currently purchases most of its circuit boards from one key supplier, although
a second supplier has been qualified.
 
EMPLOYEES
 
  ATL refers to its employees as associates. At June 1, 1998, ATL employed 342
associates including 133 in manufacturing, 82 in engineering, 38 in customer
service, 60 in sales and marketing and 29 in general and administration. ATL
also employs a small number of temporary and contract employees. ATL is not a
party to any collective bargaining agreement or other similar agreement. ATL
has not experienced any work stoppages to date. ATL believes that its
relationship with its employees is good.
 
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<PAGE>
 
        ATL MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION
                          AND RESULTS OF OPERATIONS.
 
  The following discussion and analysis should be read in conjunction with the
Financial Statements and related Notes thereto contained elsewhere in this
Proxy Statement/Prospectus. This Proxy Statement/Prospectus contains forward-
looking statements that involve a number of risks and uncertainties including,
without limitation, those set forth in "RISK FACTORS." ATL's actual results
may differ materially from any future performance discussed in the forward-
looking statements and in this Management's Discussion and Analysis of
Financial Condition and Results of Operations. See "FORWARD-LOOKING
STATEMENTS."
 
OVERVIEW
 
  ATL was established in 1990 as a division of Odetics to use its technical
expertise in information automation technology to develop automated tape
libraries that replace the manual storage and retrieval of computer tapes.
Initially, ATL and E-Systems, Inc. worked to develop and provide a 19mm
automated tape cartridge handling subsystem which ATL introduced in 1992. In
1992, ATL also introduced automated tape handling products for systems
employing IBM 3480 and similar industry standard tape cartridges. In 1994, ATL
introduced the ATL 2640, its first automated tape library designed for
distributed computing environments, based on the DLT format. ATL extended its
line of DLT based automated tape libraries in 1995 by introducing its 520
Series, designed for smaller libraries in the midrange and distributed
computing environments, applications which historically had required less
storage capacity and less formal data processing. In November 1996, ATL
announced the introduction of its ATL 7100 tape library series, which was
designed for enterprise system administrators who require multiple terabyte
backup and archiving. ATL's most recent product, the P1000, was initially
shipped in the third fiscal quarter of 1998. The P1000 is ATL's first library
series to incorporate ATL's Prism Library Architecture. All of ATL's product
sales are currently derived from DLT based automated tape libraries.
 
  Effective December 31, 1996, Odetics transferred to ATL that portion of its
business which provided service and support for ATL's products. The transfer
was made at book value and resulted in an increase of $2.3 million in ATL's
obligations to Odetics. For financial accounting purposes the transaction has
been treated in a manner similar to a pooling of interests, and the financial
information for this operation has been included in ATL's financial
information for all annual periods presented.
 
  In July 1996, ATL established its own wholly-owned European subsidiary, APL,
to facilitate ATL's sales in Europe. For periods prior to the establishment of
APL, ATL utilized a subsidiary of Odetics for administrative services related
to the distribution of its products in Europe. The revenues, costs and
expenses incurred by this entity that relate to ATL's products have been
combined in the accompanying selected financial data for all applicable
periods in order to present these activities in a manner similar to a pooling
of interests.
 
  In March 1998, ATL established a new sales subsidiary in Australia and a new
branch office in Japan. These new locations are intended to support ATL's on-
going efforts to expand its business opportunities in the Asia Pacific region.
 
  ATL's operating expenses have increased significantly in recent periods as
ATL has added resources in order to support expanding growth opportunities.
ATL also expects operating expenses to increase as ATL continues to build its
management and information systems and other infrastructure to support the
services previously performed by Odetics. Accordingly, historical overhead
expense included herein is not necessarily indicative of the expense which may
be incurred by ATL in future periods.
 
  Odetics and ATL have entered into certain agreements related to the spin-off
of Odetics' interest in ATL to the stockholders of Odetics (the
"Distribution") and governing various interim and continuing relationships
between the companies, including (i) a Separation and Distribution Agreement
which set forth the principal corporate transactions required to effect the
separation of ATL from Odetics, the initial public offering and the
 
                                      67
<PAGE>
 
Distribution, (ii) a Tax Allocation Agreement which governed the allocation of
tax liabilities between ATL and Odetics, and (iii) a Services Agreement,
pursuant to which Odetics will continue for an interim period following the
initial public offering and the Distribution to perform certain financial,
management information and other services for ATL. Items (i) and (ii), above
were effectively canceled upon Odetics' distribution of its remaining shares
of ATL Class A Common Stock. During fiscal 1998, charges paid to Odetics
pursuant to the Services Agreement declined as ATL began to build its own
infrastructure and to incur directly expenses that otherwise would have been
included in charges allocated by Odetics.
 
  In March 1997, ATL completed an initial public offering of 1,650,000 of its
Class A Common Stock, following which Odetics' beneficial ownership of ATL was
reduced to 82.9%. The initial public offering generated net proceeds to ATL of
approximately $16.0 million, $6.8 million of those proceeds were used to
reduce ATL's obligations to Odetics. The balance of the proceeds was being
used to fund working capital requirements. In October 1997, Odetics completed
the Distribution by disbursing its remaining ownership interest in ATL to
stockholders of Odetics.
 
RESULTS OF OPERATIONS
 
  The following table sets forth for the years indicated, the percentages of
net sales represented by each item in ATL's statement of operations.
 
<TABLE>
<CAPTION>
                              FISCAL YEAR ENDED MARCH 31,      QUARTER ENDED JUNE 30,
                             -------------------------------   ------------------------
                               1998       1997       1996         1998         1997
                             ---------  ---------  ---------   -----------  -----------
   <S>                       <C>        <C>        <C>         <C>          <C>
   Net sales
     Products..............       90.0%      89.5%      84.3%         86.8%        89.8%
     Service and spare
      parts................       10.0       10.5       15.7          13.2         10.2
                             ---------  ---------  ---------   -----------  -----------
   Total net sales.........      100.0      100.0      100.0         100.0        100.0
   Gross profit
     Products..............       37.0       39.3       36.8          33.2         40.2
     Service and spare
      parts................       39.3       51.7       31.1          35.8         35.7
                             ---------  ---------  ---------   -----------  -----------
   Total gross profit......       37.2       40.6       35.9          33.6         39.7
   Expenses:
     Research and develop-
      ment.................        8.6        9.5        5.9           8.1          9.5
     Sales and marketing...       12.5       11.8       12.6          12.0         14.5
     General and adminis-
      trative..............        4.1        5.6       10.0           3.8          3.6
     Nonrecurring charge...        --         --         4.8            --           --
                             ---------  ---------  ---------   -----------  -----------
   Income (loss) from oper-
    ations.................       12.0       13.7        2.6           9.7         12.1
   Interest expense........        1.0        2.8        6.3           0.8          1.4
                             ---------  ---------  ---------   -----------  -----------
   Income (loss) before in-
    come taxes.............       11.0       10.9       (3.7)          8.9         10.7
   Income taxes............        2.7        4.4        0.3           3.1          4.3
                             ---------  ---------  ---------   -----------  -----------
   Net income (loss).......        8.3%       6.5%      (4.0)%         5.8%         6.4%
                             =========  =========  =========   ===========  ===========
</TABLE>
 
 Three Months Ended June 30, 1998 and 1997
 
  Net Sales. Total net sales increased 77.7% to $33.0 million for the first
quarter of fiscal 1999 as compared to total net sales of $18.6 million in the
first quarter of the prior fiscal year.
 
  Product sales increased 71.6% to $28.6 million for the first quarter of
fiscal 1999 as compared to $16.7 million in the corresponding period of the
prior fiscal year. These increases occurred in all library families with 7100
series library sales contributing the largest share at 31% of total product
sales. The 520 and 2640 series library shipments continued their steady
performance representing 26% and 21%, respectively, of total first
 
                                      68
<PAGE>
 
quarter product sales. Sales of P1000 series, ATL's newest library offering
which began shipping in the third quarter of the prior fiscal year, were lower
than expected. ATL expects that P1000 sales will regain momentum in the second
fiscal quarter due to a renewed focus on the product line and initial
shipments to its OEM customers. Also during the first quarter of fiscal 1999,
ATL made its first revenue shipments of the PowerStor library manufactured by
Quantum. Fiscal 1999 first quarter OEM revenues rose significantly and
represented approximately 66% of total product sales, compared to
approximately 50% in the prior year comparable quarter. This large increase in
OEM revenue was due to a combination of strength in the 7100 series sales and
the lower than anticipated P1000 shipments, which, to-date, have only been
shipped through the VAR channel. Revenues generated from non-library sales,
which include primarily drive upgrade kits and media, accounted for 8.0% of
fiscal 1999 first quarter revenue as compared to 4.6% in the prior year
comparable quarter.
 
  Service and parts sales include revenue derived from the sale of spare parts
and service contract activities to support the installed base of ATL's
products. Service revenues in the first quarter of fiscal 1999 were
exceptionally strong due to higher parts sales and an increase in extended
service contract revenues. Service and parts sales in the first quarter of
fiscal 1999 increased 131% to $4.4 million as compared to $1.9 million in the
first quarter of the prior fiscal year.
 
  Gross Profit. Total gross profit as a percent of total net sales decreased
to 33.6% for the first quarter of fiscal 1999 from 39.7% for the first quarter
of the prior fiscal year. Gross profit on product sales decreased to 33.2% for
the first quarter of fiscal 1999 as compared to 40.2% for the first quarter of
fiscal 1998. The primary reason for the decline was directly related to the
large shift in channel mix with OEM revenues accounting for a record 66% of
total first quarter fiscal 1999 revenues. As OEM products, on balance,
generate lower overall gross margins, the large increase in OEM sales had a
corresponding downward impact on overall gross profit. In addition, the
product mix within the quarter also included sales having a higher drive
content; and, as drives are typically margined lower than libraries, an
increase in the value of the drive component of the mix also negatively
impacted fiscal 1999 first quarter gross profit. ATL believes that both the
channel mix and the higher proportion of drives relative to libraries sold was
somewhat unique during the first quarter of fiscal 1999 and anticipates that
both figures will move toward their historical averages in the second quarter
of fiscal 1999. However, ATL believes average selling prices on future product
sales will likely decline as a result of both competition and ATL's desire to
increase market share. While ATL continues working with its suppliers to
reduce its costs of materials and to improve manufacturing efficiencies, there
can be no assurance these actions will be sufficient to offset future
reductions in sales prices.
 
  Research and Development. Research and development expense increased 50.9%
to $2.7 million (8.1% of total net sales) for the first quarter of fiscal 1999
compared to $1.8 million (9.5% of total net sales) in the corresponding period
of the prior fiscal year. The increase in research and development expense for
the first quarter of fiscal 1999 as compared to the corresponding quarter of
the prior fiscal year is primarily driven by investments in the development,
qualification and preproduction costs for ATL's new P3000 and L500 series
libraries. Also, ATL continues its Prism Architecture development, web-based
internet software tool development and ongoing enhancement investments in
current products. ATL expects expenditures for research and development
generally to increase over time and to be higher during periods of new product
development when significant expenditures are incurred for preproduction
activities and increased testing. These expenditures may, therefore, fluctuate
as a percentage of total net sales from period to period.
 
  Sales and Marketing. Sales and marketing expense increased to $4.0 million
(2.0% of total net sales) for the first quarter of fiscal 1999 compared to
$2.7 million (14.5% of total net sales) in the corresponding period of the
prior fiscal year. The increase is due in large part to the expansion and
strengthening of ATL's sales and marketing organization, including higher
promotional expenditures, advertising, and variable sales expenses. ATL
anticipates that total aggregate spending for sales and marketing will
continue to rise as ATL expands both its domestic and international sales and
marketing organizations in order to take advantage of the opportunities being
presented by the expanding worldwide data storage marketplace.
 
  General and Administrative. General and administrative expense increased to
$1.3 million (3.8% of total net sales) for the first quarter of fiscal 1999
compared to $661,000 (3.6% of total net sales) in the corresponding period of
the prior fiscal year. The increase in aggregate dollar spending for the
comparable quarters is due
 
                                      69
<PAGE>
 
primarily to the development of infrastructure to support increasing finance,
information systems, and general operating activities consistent with the
overall growth of ATL's business operations, and to replace infrastructure
costs that were in part previously supplied by ATL's former parent. As ATL
continues to add the infrastructure necessary to support both its domestic and
international operations, ATL believes that aggregate general and
administrative expenses will continue to increase.
 
  Income Taxes. ATL's effective tax rate was 35.0% for the first quarter of
fiscal 1999 compared to 40.0% in the corresponding period of the prior fiscal
year. The reduction in effective tax rate for the comparable quarters is due
to implementation of various domestic and foreign tax credits which are now
available to ATL due to its separation from its former parent on October 31,
1997.
 
 Years Ended March 31, 1998, 1997 and 1996
 
  Net Sales. Total net sales increased 63.0% to $97.6 million for the fiscal
year ended March 31, 1998 ("fiscal 1998") as compared to total net sales of
$60.0 million in fiscal 1997. Total net sales increased 104.1% to $60.0
million in the fiscal year ended March 31, 1997 ("fiscal 1997") from $29.4
million in the fiscal year ended March 31, 1996 ("fiscal 1996").
 
  Product sales rose to $87.9 million or 63.7% for fiscal 1998 compared to
$53.7 million in the prior year period. This overall increase was due to
continued growth in ATL's traditional 2640 and 520 product lines as well as
strong demand for ATL's 7100 tape library series, which ATL began shipping in
the last fiscal quarter of the prior year. Also contributing to the strong
growth rate was the fiscal fourth quarter introduction of the P1000, ATL's
latest automated tape library offering, as well as increased shipments of tape
upgrade kits during both the third and fourth fiscal quarters. Fiscal 1997
product sales increased 116.6% to $53.7 million compared to fiscal 1996,
reflecting growth in both ATL's 2640 and 520 tape libraries and the fiscal
fourth quarter introduction of the 7100 tape library series.
 
  Service and spare parts sales include revenue derived from the sales of
spare parts and extended service contracts to support the worldwide installed
base of tape library products. In fiscal 1998, service revenues represented
10.0% of total net sales compared to 10.5% in fiscal 1997. Total service and
spare parts sales levels have increased by 54.0% over fiscal 1997 due to both
higher parts sales consistent with the large increase in the worldwide
installed base of libraries and increased extended service contract revenues.
ATL expects that service revenues in future periods will continue to increase
as the initial one-year warranties on prior sales expire and customers
purchase extended service contracts. In fiscal 1996, service revenues
represented 15.7% of total net sales.
 
  Gross Profit. Total gross profit as a percent of total net sales declined to
37.2% in fiscal 1998 from 40.6% in fiscal 1997 but rose from 35.9% in fiscal
1996.
 
  Gross profit on product sales was 37.0% in fiscal 1998 compared to 39.3% in
fiscal 1997. The decline in overall gross profit was due primarily to the
impact of increased volumes of higher cost DLT7000 drives being included
within ATL's libraries. In the fiscal 1998 fourth quarter, over 90% of the
libraries sold contained DLT7000 drives. The introduction of the P1000 in the
fourth quarter of fiscal 1998 also contributed to lower overall gross profit
margins as this product, until volume production commenced, was expected to
carry lower overall margins than those of ATL's other product lines. Finally,
the increasingly competitive pricing environment for ATL's products, together
with the increased investments in operations infrastructure necessary to
support the increased production volume, have also contributed to overall
lower gross margins. ATL believes that competitive pricing pressures will
continue to reduce average selling prices in the future. While ATL continues
to work to improve manufacturing efficiencies and reduce component costs,
there can be no assurance that these cost reduction activities will be
sufficient to offset the potentially negative impact of lower average selling
prices. In fiscal 1997, gross profit on product sales was 39.3% compared to
36.8% in fiscal 1996. This increase was attributable to improved absorption of
manufacturing overhead resulting from increased production levels as well as
reductions in the cost of materials.
 
                                      70
<PAGE>
 
  Gross profit on service and spare parts sales was 39.3% in fiscal 1998,
51.7% in fiscal 1997 and 31.1% in fiscal 1996. The decline in fiscal 1998
margins was primarily due to unusually high service margins in 1997 due to
both the impact of a higher proportion of spare parts sales and the prior year
impact of a favorable nonrecurring adjustment to service inventory reserves.
The increase in 1997 margins over 1996 was due to the unfavorable impact of
the reserve adjustments recorded in 1996.
 
  Research and Development. In fiscal 1998, research and development expense
increased to $8.4 million (8.6% of total net sales) from $5.7 million (9.5% of
total net sales) in fiscal 1997 and from $1.7 million (5.9% of total net
sales) in fiscal 1996. The increased fiscal 1998 research and development
expenditures resulted from investments to support the Prism Library
Architecture development, the introduction of the 7100 library series, the
introduction of the P1000 in the fourth quarter of fiscal 1998, and the
development and qualification activities for the new P3000 and L500 library
series. ATL also continued its aggressive development efforts in new web-based
internet software management tools such as the 1997 introduction of WebAdmin.
In addition, ATL has continued to invest in comprehensive development
activities with its major OEM customers in order to support the product
requirements identified by these important partners. The increase in fiscal
1997 spending over fiscal 1996 levels was due primarily to the development,
testing and pre-production activities for ATL's 7100 series, Prism technology
development and the incorporation of the new DLT7000 tape technology into
ATL's then- existing products. ATL expects expenditures for research and
development to increase over time and to be higher during periods of new
product development when significant expenditures are incurred in
preproduction and increased testing. These expenditures may, therefore,
fluctuate as a percentage of sales from period to period.
 
  Sales and Marketing. Sales and marketing expense increased to $12.2 million
(12.5% of total net sales) compared to $7.1 million (11.8% of total net sales)
in fiscal 1997 and to $3.7 million (12.6% of total net sales) in fiscal 1996.
The dollar increases in both years is due to ATL's expansion of its worldwide
sales and marketing organizations and related activities in North America,
Europe and Asia Pacific. ATL has continued to invest in increased advertising,
promotion and trade show expenditures necessary to continue to develop new
market opportunities. Increased sales variable expenses, such as commissions
and travel and entertainment expenses, also increased in a manner consistent
with increased sales levels. ATL anticipates that total aggregate spending for
sales and marketing will continue to rise as ATL expands both its domestic and
international sales and marketing organizations in order to take advantage of
the opportunities being presented by the expanding worldwide data storage
marketplace.
 
  General and Administrative. During fiscal 1998, 1997 and 1996, ATL operated
with various agreements between ATL and Odetics. Pursuant to these agreements,
Odetics has provided various tax, financial, information systems and other
administrative support activities to ATL at an established allocated cost. On
October 31, 1997, Odetics distributed its remaining 82.9% ownership in ATL's
Common Stock to all Odetics stockholders. As a result of this transaction, the
Tax Sharing Agreement was terminated. At the same time, ATL continues to
operate with other various shared service activities including information
systems and other administrative support functions. ATL expects, during fiscal
1999, to continue to build the infrastructure necessary to eventually assume
all information system and administrative responsibilities.
 
  General and administrative expense increased to $4.0 million (4.1% of total
net sales) in fiscal 1998 from $3.4 million (5.6% of total net sales) in
fiscal 1997 and from $2.9 million (10.0% of total net sales ) in fiscal 1996.
The increased aggregate expenses were due largely to the development of the
infrastructure noted above and consisted primarily of increased finance,
information systems and other infrastructure support personnel. In addition,
ATL has incurred increased legal, accounting and other professional fees
consistent with the overall growth in its business operations. As ATL
continues to add the infrastructure necessary to support both its domestic and
international operations, ATL believes that general and administrative
expenses will continue to increase in aggregate dollars.
 
  Nonrecurring Charge. ATL incurred a nonrecurring charge of $1.4 million in
fiscal 1996, which consisted of legal expenses incurred in connection with
patent infringement litigation with E-Systems, which was settled in May 1996.
 
                                      71
<PAGE>
 
  Income Taxes. Through October 31, 1997, ATL was included in the consolidated
tax return of its former parent company, Odetics. According to the Tax Sharing
Agreement between the two companies, members of the consolidated group that
generate taxable losses were not allocated any tax benefit for such losses if
the consolidated group as a whole is profitable. Accordingly, for periods
prior to April 1, 1996, during which ATL incurred losses, ATL had no domestic
income tax provision or benefit. In addition, because ATL's losses have been
used to offset Odetics' taxable income in the consolidated federal tax
returns, ATL had no loss carry forward available to offset future taxable
income. For periods subsequent to April 1, 1996, ATL entered into a Tax
Allocation Agreement with Odetics, pursuant to which ATL would make a payment
to Odetics, or Odetics would make a payment to ATL, as appropriate, in an
amount equal to the taxes attributable to the operations of ATL on the
consolidated federal income tax returns and consolidated or combined state tax
returns filed by Odetics. In addition, the Tax Allocation Agreement provided
that members of the Odetics consolidated group generating tax losses after
April 1, 1996 would be paid by other members which utilize such tax losses to
reduce such other members' tax liability. Accordingly, for fiscal 1997, ATL's
effective tax rate was 40.0%.
 
  Subsequent to the Distribution on October 31, 1997, ATL's Tax Allocation
Agreement was terminated and ATL has assumed responsibility for its own tax
planning strategies, and has filed its own federal and state income tax
returns. As a result of new tax planning options available to ATL, ATL
reported an effective tax rate of 37.0% for the five month period ended March
31, 1998, excluding the favorable impact of the nonrecurring tax benefit
recorded in the fiscal fourth quarter.
 
  During the fourth quarter of fiscal 1998, ATL benefited from an approximate
$1.5 million reduction of federal deferred tax valuation allowances provided
in prior years. ATL was able to recognize this benefit because its taxable
income in the five month period ending March 31, 1998, when ATL was not
included in the consolidated tax return of Odetics, was sufficient to provide
assurance of the realization of previously reserved deferred tax benefits.
 
  The combination of the factors noted above resulted in an effective tax rate
of 24.4% for fiscal 1998 compared to 40.0% in fiscal 1997.
 
  Backlog. ATL builds products both to forecast and to order. As a result,
ATL's total net sales during any period are largely dependent upon orders
booked and shipped during that period. ATL includes in its backlog those
customer orders for which it has received purchase orders and for which
shipment is scheduled within the next twelve months; however, most orders are
filled within 90 days. In general, all purchase orders are cancelable under
certain circumstances. Due to the potential cancellation or orders and delays
in customer shipments and delivery schedules, ATL's backlog at any period may
not be indicative of actual sales for any succeeding period.
 
  Although ATL primarily attempts to build to order, it must purchase
components and subassemblies and incur operating expenses which are relatively
fixed in nature based upon forecasted orders. If orders do not meet ATL's
forecast in any given quarter, the adverse impact of a shortfall in revenue
may be magnified by ATL's inability to reduce expenditures quickly, and could
have a material adverse effect upon ATL's results of operations for that
period.
 
LIQUIDITY AND CAPITAL RESOURCES
 
  Total working capital increased to $21.1 million at March 31, 1998 from
$15.9 million at March 31, 1997 due primarily to increases in inventory and
accounts receivable, offset by increases in accounts payable and other accrued
liabilities. During fiscal 1998, ATL used $3.7 million in cash from operating
activities primarily to finance higher inventory levels. For the first quarter
of fiscal 1999, ATL incurred a reduction in cash and cash equivalents of
$845,000. Operating activities for the first quarter of fiscal 1999 consumed
cash of $8.1 million, which included net income of $1.9 million that was
offset by reductions of accounts payable and accrued expenses of $7.1 million,
and increases in accounts receivable and inventory of $2.3 million and $1.2
million respectively. ATL also used approximately $3.8 million and $413,000 in
fiscal 1998 and in the first quarter of fiscal 1999, respectively, in order to
purchase equipment and make leasehold improvement additions.
 
                                      72
<PAGE>
 
  ATL was originally capitalized with a $1.0 million capital investment
provided by Odetics. Since its inception, and until its initial public
offering in March 1997, ATL relied primarily upon interest bearing advances
from Odetics to fund its working capital requirements. On December 31, 1996,
ATL purchased from Odetics the net assets of the division of Odetics that
provided service and support for ATL's products for $2.3 million. This
purchase was reflected as an increase in ATL's current obligation to Odetics.
On April 1, 1997, ATL entered into a promissory note payable to Odetics in the
original principal amount of $13.0 million, which represented the aggregate
balance of ATL's cumulative borrowings from Odetics. Interest was payable on
this note at a rate equal to Odetics' cost of borrowing with principal and
interest payments due in sixteen equal quarterly installments at the end of
each quarter beginning June 30, 1997 and ending on March 31, 2001.
 
  In March 1997, ATL completed an initial public offering of 1,650,000 shares
of its Class A Common Stock. ATL generated $15.9 million of cash from the
initial public offering and used $8.9 million to repay a portion of ATL's
intercompany indebtedness to Odetics and approximately $2.0 million for
purchases of equipment and leasehold improvements. During fiscal 1997, ATL
also generated approximately $4.5 million of cash from operating activities,
of which $3.9 million was provided through net income.
 
  In March 1998, in order to facilitate ATL's worldwide sales growth, ATL
secured a new credit facility with Union Bank of California through January
2000. This facility included a $20.0 million working capital line, subject to
a maximum borrowing base restriction on ATL's eligible accounts receivable and
a $6.5 million term loan which was available to ATL on a quarterly basis in
order to fund quarterly debt repayments to Odetics, Inc. This facility also
provides for borrowings at the lesser of the bank's prime rate (8.5% at June
30, 1998) or at LIBOR plus 1.75% to 2.25% basis points, depending upon
borrowing level, and was secured by all of ATL's assets. At June 30, 1998, ATL
had outstanding approximately $10.0 million under the working capital line and
approximately $1.6 million under the term loan. In July 1998, ATL renegotiated
the term loan portion of its credit facility with Union Bank of California
from $6.5 million to $10.5 million and a new expiration date of November 1998.
Upon completion of the term loan renegotiation, ATL drew down the remaining
unused portion of $8.6 million and paid off in full the outstanding loan
balance due to Odetics. ATL believes that cash flow generated from operations,
in conjunction with funds available under ATL's bank line of credit, will be
adequate to execute its current operating plans and meet its obligations on a
timely basis. ATL does not have any material commitments for capital
expenditures as of June 30, 1998.
 
  In July 1998, ATL entered into a five year lease agreement which included
two, five-year options for a new worldwide headquarters facility in Irvine,
California. This new facility will accommodate ATL's engineering, sales,
marketing, and general and administrative functions. This facility is
approximately 63,000 square feet, and ATL expects to be able to occupy the new
facility in the third quarter of fiscal 1999.
 
YEAR 2000 COMPLIANCE
 
  Many current computer systems and software products may not correctly
distinguish 21st century dates from 20th century dates. As a result, computer
systems and/or software used by many companies may need to be upgraded to
comply with such "Year 2000" requirements. Significant uncertainty exists in
the hardware and software industry concerning the potential effects associated
with such compliance. All of ATL's core products have been designed to be Year
2000 compliant. ATL has scheduled a change to its MRP system for the fourth
quarter of calendar 1998 to utilize a version of the system which is expected
to be Year 2000 compliant. ATL does not expect the cost of this upgrade to be
significant. ATL believes that all of its other business systems will be Year
2000 compliant, but will continue to pursue certification of compliance for
all critical business systems. ATL has made Year 2000 compliance a requirement
for all purchases of its business systems. ATL may be required to expend
additional resources to make Year 2000 compliance corrections to its
information systems, which corrections may not be able to be made in a timely
basis, if at all. ATL believes that the Year 2000 issues may affect purchasing
patterns of customers and potential customers in a variety of ways. Many
companies are expending significant resources to correct their current systems
for Year 2000 compliance. These expenditures may result in reduced funds
available to purchase products such as those offered by ATL. Many potential
 
                                      73
<PAGE>
 
customers may also choose to defer purchasing Year 2000 compliant products
until they believe it is absolutely necessary, thus resulting in potentially
stalled market sales within the industry. In addition, Year 2000 issues could
cause a significant number of companies, including current customers of ATL,
to reevaluate their current systems needs, and, as a result consider switching
to other systems or suppliers. Any of the foregoing could have a material
adverse effect on ATL's business, financial condition and results of
operations. ATL also relies directly and indirectly, on the external systems
of business enterprises such as customers, suppliers, creditors, and financial
organizations for accurate exchange of data. Even if ATL's products or its
internal systems are not materially affected by the Year 2000 issue, ATL could
be affected through disruptions in the operations of the enterprises with
which ATL interacts. Despite ATL's efforts to address the impact of the Year
2000 issue on its internal systems and business operations, there can be no
assurance that such will not result in a material disruption of its business
or have a material adverse effect on ATL's business, financial condition or
result of operations.
 
                                      74
<PAGE>
 
                                ATL MANAGEMENT
 
DIRECTORS AND EXECUTIVE OFFICERS
 
  Certain information concerning officers and directors of ATL as of June 25,
1998 is as follows:
 
<TABLE>
<CAPTION>
    NAME                  AGE                          POSITIONS
    ----                  --- ------------------------------------------------------------
<S>                       <C> <C>
Kevin C. Daly, Ph.D.....   53 Chairman of the Board, President and Chief Executive Officer
Mark P. de Raad.........   39 Chief Financial Officer
Chester Baffa...........   58 Vice President, Marketing and Sales
Todd Kreter.............   38 Vice President, Operations
Steve Morihiro..........   40 Vice President, Engineering
James A. Pipp...........   53 Vice President, Controller and Secretary
Mark P. Spowart.........   46 Vice President, Worldwide Sales
Crandall Gudmundson(1)..   67 Director
Joel Slutzky(1).........   59 Director
Thomas L. Thomas........   48 Director
Paul E. Wright(1).......   67 Director
</TABLE>
- --------
(1) Member of the Audit Committee and the Compensation Committee.
 
  Directors are elected annually and serve until the next Annual Meeting of
Stockholders and until their successors are duly elected and qualified.
Officers are elected by, and serve at the discretion of, the Board of
Directors. There are no family relationships among any of the directors or
officers of ATL.
 
  KEVIN C. DALY, PH.D. has served as President and Chief Executive Officer and
a member of the Board of Directors of ATL since its formation in January 1993,
and Chairman of the Board since December 1996. Dr. Daly has also served as a
member of the Board of Directors of Odetics since June 1993 and as Vice
President and Chief Technical Officer of Odetics from 1987 to 1997. Prior to
that, Dr. Daly served as the Director of Space Systems of Odetics since 1985
when he joined Odetics. From March 1974 until June 1985, Dr. Daly served as
the Director of the Control and Dynamics Division of the Charles Stark Draper
Laboratory. During that period, Dr. Daly participated in the design and
development of guidance, navigation and control systems for several major
space programs including the United States Space Shuttle program. Dr. Daly
served as a manager of electronic systems for a major space program of the
United States Air Force from March 1970 to March 1974. Dr. Daly has also
served on several advisory committees to the United States Government.
 
  MARK P. DE RAAD has served as Chief Financial Officer of ATL since September
1997. Prior to joining ATL, Mr. de Raad was employed, since 1987, by AST
Research, Inc, a worldwide manufacturer of personal computers, in various
positions, most recently as Vice President, Finance, Treasurer and Principal
Accounting Officer. Prior to 1987, Mr. de Raad was employed by Tandem
Computers, Inc. and KMPG Peat Marwick, LLP. Mr. de Raad is a certified public
accountant.
 
  CHESTER BAFFA has served as Vice President, Marketing and Sales of ATL since
June 1995. Prior to joining ATL, Mr. Baffa was Senior Vice President,
Marketing and Sales at Micropolis, Inc., a manufacturer of high capacity disk
and RAID storage products from May 1983 until September 1994. Prior to May
1983, Mr. Baffa was Vice President, Marketing and Sales at Oki Data Corp.
 
  TODD KRETER has served as ATL's Vice President, Operations since June 1996
and as Director of Operations from January 1993 until June 1996. Mr. Kreter
served as a project manager at Odetics from 1990 until 1992. Mr. Kreter was an
engineer for Omutec, a division of Odetics which is engaged in production of
flight control hardware for commercial and military aircraft from 1986 until
1990. Prior to 1986, Mr. Kreter was a research and development engineer at
Ford Aerospace Corporation.
 
  STEVE MORIHIRO has served as ATL's Vice President, Engineering since June
1996. Mr. Morihiro served as ATL's Director of Engineering from December 1994
until June 1996, as Engineering Manager from October
 
                                      75
<PAGE>
 
1992 until December 1994 and as a Project Manager from January 1992 until
October 1992. Mr. Morihiro served as a mechanical engineering manager at
Odetics for the Advanced Intelligent Machines division from October 1990 until
October 1991 and as operations manager from October 1991 until December 1991.
Prior to joining Odetics, Mr. Morihiro served from 1979 until 1982, and then
again from 1983 until 1990, in various engineering and program management
capacities at Western Design Corporation, a developer and manufacturer of
material handling equipment for the defense industry.
 
  JAMES A. PIPP has served as the Vice President, Controller and Secretary of
ATL since June 1996 and as Controller since January 1993. From 1981 to 1993,
Mr. Pipp served as the Corporate Controller of Odetics. Mr. Pipp is a
certified public accountant.
 
  MARK SPOWART has served as Vice President, Worldwide Sales since June 1996
and has been responsible for the development and organization of ATL's sales
force since March 1992. Prior to joining ATL, Mr. Spowart served in general
sales management positions in various segments of the computer industry
including mainframe systems, Unix client servers and PC LAN. From April 1990
to March 1992, Mr. Spowart was District Manager for Auspex Systems, and from
March 1982 until April 1990, Mr. Spowart was employed by Memorex Telex in
general sales management positions.
 
  CRANDALL GUDMUNDSON has served as a director of ATL since 1993. Mr.
Gudmundson is a co-founder of Odetics, has served as President of Odetics
since 1975 until his retirement in late 1997, and has been a director of
Odetics since 1979. Mr. Gudmundson has also served as a director of Odetics
since 1969. Prior to co-founding Odetics, Mr. Gudmundson was the lead project
engineer for Leach Corporation.
 
  JOEL SLUTZKY has served as a director of ATL since its formation in January
1993. Mr. Slutzky has served as Chairman of the Board and Chief Executive
Officer of Odetics since he co-founded Odetics in 1969. From May 1993 until
January 1994, Mr. Slutzky also served as the Chief Financial Officer of
Odetics, and as President of Odetics from 1969 to 1975. Prior to that, Mr.
Slutzky was an engineering manager at Leach Corporation, now part of the
Lockheed Electronics Division of Lockheed Corporation.
 
  THOMAS L. THOMAS has served as a director of ATL since November 1997. Mr.
Thomas .has been the Senior Vice President and Chief Information Officer,
Global Information Systems of 3Com Corporation since August 1996 and a member
of the Executive Committee of 3Com. From September 1995 through July 1996, Mr.
Thomas served as the Vice President and Chief Information Officer, Global
Information Systems. Prior to joining 3Com, Mr. Thomas had been Vice President
and Chief Information Officer of Dell Computer Corporation, a manufacturer of
personal computers, from 1993 to 1995. Prior to that, Mr. Thomas served as
Vice President of Management Information Systems at Kraft General Foods from
1987 to 1993, and at Sara Lee Corporation from 1981 to 1987. Mr. Thomas
currently serves on several Industry Advisory Boards for Dell Computer
Corporation and Vital Signs.
 
  PAUL E. WRIGHT was appointed as a director of ATL in July 1997. Mr. Wright
is the President of Wright Associates--Engineering and Business Consultants, a
company he formed in 1997. Mr. Wright served as the Chairman of Chrysler
Technologies Corp., the aerospace and defense electronics subsidiary of
Chrysler Corporation, from 1988 until his retirement in 1997. From 1986 to
1988, Mr. Wright served as President and Chief Operating Officer of Fairchild
Industries, Inc. Prior to joining Fairchild, he was employed for 28 years by
RCA Corporation, where he last served as the Senior Vice President responsible
for planning RCA's merger into General Electric Corporation. Mr. Wright has
also served as a director of Odetics since 1993.
 
COMPENSATION OF DIRECTORS
 
  ATL reimburses all for out-of-pocket expenses incurred in attending meetings
of the Board and any committee thereof, and currently pays to Messrs. Thomas
and Wright $15,000 annually for serving on the Board of Directors. Nonemployee
directors are eligible to receive periodic option grants pursuant to the
Automatic Option Grant Program under the 1997 Stock Incentive Plan. Under the
1997 Stock Incentive Plan, each
 
                                      76
<PAGE>
 
nonemployee director received an option to purchase 10,000 shares of ATL Class
A Common Stock in connection with his initial appointment to the Board of
Directors and will receive an additional option to purchase 5,000 shares on
the date of each Annual Meeting thereafter. Each such option will have an
exercise price equal to the fair market value per share of the ATL Class A
Common Stock on the grant date and will have a maximum term of ten years,
subject to earlier termination following the optionee's cessation of service
as a Board member. See "ATL EXECUTIVE COMPENSATION--1997 Stock Incentive
Plan."
 
BOARD MEETINGS AND COMMITTEES
 
  ATL has two standing committees, the Compensation Committee and the Audit
Committee, both of which were formed after fiscal 1997 upon the completion of
ATL's initial public offering. ATL has no standing nominating committee, and
the Board as a whole acts upon matters which would otherwise be the
responsibility of a nominating committee. The Audit Committee supervises and
reviews the audit and audit review programs and procedures of ATL's
independent auditors, ATL's internal accounting staff and the results of
internal auditing procedures. The Audit Committee also reviews the
independence, professional services, fees, plans and results of the
independent auditors' engagement, and recommends their retention or discharge
to the Board. The members of ATL's Audit Committee are Messrs. Gudmundson,
Slutzky and Wright. The Audit Committee held one meeting during the fiscal
year ended March 31, 1998.
 
  The Compensation Committee will make recommendations to the Board concerning
the compensation of all officers of ATL and will administer ATL's stock option
plans. The members of ATL's Compensation Committee are Messrs. Gudmundson,
Slutzky and Wright. The Compensation Committee held one meeting during fiscal
1998.
 
SECTION 16(A) BENEFICIAL OWNERSHIP REPORTING COMPLIANCE
 
  Section 16(a) of the Securities Exchange Act of 1934, as amended, requires
ATL's executive officers, directors and persons who beneficially own more than
10% of ATL's Common Stock to file initial reports of ownership and reports of
changes in ownership with the Securities and Exchange Commission. Such persons
are required by the SEC regulations to furnish ATL with copies of all Section
16(a) reports filed by such person. Based solely upon ATL's review of such
reports furnished to ATL and written representations from certain reporting
persons, ATL believes that all filing requirements applicable to ATL's
executive officers, directors and 10% stockholders were complied with, except
for the following transactions which where reported late: (i) the grant of
options to purchase 10,000 shares of ATL Class A Common Stock to Mr.
Gudmundson in November 1997; and (ii) the grant of options to purchase 10,000
shares of ATL Class A Common Stock by Mr. Slutzky in November 1997.
 
                                      77
<PAGE>
 
                          ATL EXECUTIVE COMPENSATION
 
  The following table sets forth for the fiscal year ended March 31, 1998, all
compensation received for services rendered to ATL in all capacities by ATL's
Chief Executive Officer and each of the other most highly compensated
executive officers of ATL whose salary plus bonus exceeded $100,000 in fiscal
1998 (collectively, the "Named Executive Officers"). Amounts for fiscal 1997
and fiscal 1996 reflect the amount paid by Odetics and its subsidiaries on an
aggregate basis for periods prior to the Distribution.
 
SUMMARY COMPENSATION TABLE
 
<TABLE>
<CAPTION>
                                 ANNUAL COMPENSATION   LONG TERM COMPENSATION
                                --------------------- ------------------------
                                                      RESTRICTED  SECURITIES    ALL OTHER
NAME AND PRINCIPAL       FISCAL                         STOCK     UNDERLYING   COMPENSATION
POSITIONS                 YEAR  SALARY($)(1) BONUS($) AWARDS(2)  OPTIONS(#)(3)    ($)(5)
- ------------------       ------ ------------ -------- ---------- ------------- ------------
<S>                      <C>    <C>          <C>      <C>        <C>           <C>          
Kevin C. Daly, Ph.D.....  1998    196,257    125,000      --            --        4,023
 Chief Executive Offi-    1997    201,810     60,000      263       250,000       4,106
 cer,                     1996    164,104     50,000    2,465        12,000       3,258
 President and Chairman                                              10,000(4)
 of the Board
Chester Baffa...........  1998    192,740     95,200      --            --        5,913
 Vice President,          1997    144,938     74,000      263        50,000         --
 Marketing and Sales      1996    100,067     36,668    1,914            --         --
Mark Spowart............  1998    145,965    133,107      --            --          --
 Vice President,          1997    106,384    192,979      263        50,000       4,021
 Worldwide Sales          1996     90,312    173,739    2,567           --        4,610
Steve Morihiro..........  1998    114,404     65,000      --            --        3,253
 Vice President,          1997     96,000     15,000      171        50,000       3,120
 Engineering              1996     99,205      5,000    1,697         1,500       2,976
                                                                        667(4)
Todd Kreter.............  1998    114,461     50,000      --            --        3,237
 Vice President,          1997     96,648     15,000      163        50,000         --
 Engineering              1996     83,240      5,000    1,388         2,000         --
</TABLE>
- --------
(1) Includes amounts deferred under Odetics' Executive Deferral Plan and ATL's
    and Odetics' Section 401(k) Plan.
(2) Represents Odetics contribution to Odetics' Associate Stock Ownership Plan
    for the benefit of the Named Executive Officer during the periods prior to
    the Distribution based on the closing price of Odetics' Class A Common
    Stock at March 31, 1997 and March 31, 1996.
(3) Options granted in fiscal 1996 represent options to purchase shares of
    Class A Common Stock of Odetics. All other options indicated represent the
    options to purchase shares of ATL's Class B Common Stock.
(4) During fiscal 1996, Odetics offered all holders of Odetics' options that
    were granted in fiscal 1994 the opportunity to have the option exercise
    price of outstanding fiscal 1994 options reduced to the then current 1996
    trading price. In connection with any such option repricing, one-third of
    any repriced options were required to be canceled. The option information
    contained in this table does not take into account any options that may
    have been canceled in connection with any option repricing.
(5) Represents ATL's matching contribution under ATL's Section 401(k) Plan to
    the respective accounts of the Named Executive Officers. For periods prior
    to the Distribution, represents Odetics' matching contribution under
    Odetics' Section 401(k) Plan to the respective accounts of the Names
    Executive Officers.
 
                                      78
<PAGE>
 
AGGREGATED OPTIONS EXERCISED IN LAST FISCAL YEAR AND FISCAL YEAR-END OPTION
VALUES
 
  The following table provides information with respect to the Named Executive
Officers concerning the exercise of options during the last fiscal year and
unexercised options held as of March 31, 1998. All of the following options
entitle the holders thereof to purchase shares of ATL Class B Common Stock.
 
<TABLE>
<CAPTION>
                                                         NUMBER OF
                                                   SECURITIES UNDERLYING     VALUE OF UNEXERCISED
                                                    UNEXERCISED OPTIONS      IN-THE MONEY OPTIONS
                           SHARES                  AT FISCAL YEAR END(#)   AT FISCAL YEAR END($)(1)
                         ACQUIRED ON    VALUE    ------------------------- -------------------------
NAME                     EXERCISE(#) REALIZED($) EXERCISABLE UNEXERCISABLE EXERCISABLE UNEXERCISABLE
- ----                     ----------- ----------- ----------- ------------- ----------- -------------
<S>                      <C>         <C>         <C>         <C>           <C>         <C>
Kevin C. Daly...........     --          --        104,114      145,884     1,119,226    1,568,253
Chester Baffa...........     --          --         20,833       29,167       223,955      313,545
Mark Spowart............     --          --         20,833       29,167       223,955      313,545
Steve Morihiro..........     --          --         20,833       29,167       223,955      313,545
Todd Kreter.............     --          --         20,833       29,167       223,955      313,545
</TABLE>
- --------
(1) Based upon the market price of $15.75 per share, determined on the basis
    of the closing selling price per share of ATL Class A Common Stock on the
    Nasdaq National Market on March 31, 1998, less the option exercise price
    payable per share.
 
EMPLOYMENT CONTRACTS, TERMINATION OF EMPLOYMENT AND CHANGE IN CONTROL
ARRANGEMENTS
 
  While ATL does not currently have any employment contracts in effect with
any of its executive officers, the Board of Directors adopted the Severance
Plan in 1998, which provides for the payment of certain separation benefits to
officers and other employees of ATL in the event of termination, other than
for cause, following a change in control of ATL. See "THE MERGER--Interests of
Certain Persons in the Merger."
 
INDEMNIFICATION OF DIRECTORS AND OFFICERS
 
  Under Section 145 of the DGCL, ATL can indemnify its directors and officers
against liabilities they may incur in such capacities, including liabilities
under the Securities Act. ATL's Bylaws provide that ATL will indemnify its
directors and officers to the fullest extent permitted by law and require ATL
to advance litigation expenses upon receipt by ATL of an undertaking by the
director or officer to repay such advances if it is ultimately determined that
the director or officer is not entitled to indemnification. The Bylaws further
provide that rights conferred under such Bylaws do not exclude any other right
such persons may have or acquire under any bylaw, agreement, vote of
stockholders or disinterested directors or otherwise.
 
  ATL's Certificate of Incorporation provides that, pursuant to the DGCL, its
directors shall not be liable for monetary damages for breach of the
directors' fiduciary duty of care to ATL and its stockholders. This provision
in the Certificate of Incorporation does not eliminate the duty of care, and
in appropriate circumstances equitable remedies such as injunctive or other
forms of non-monetary relief will remain available under Delaware Law. In
addition, each director will continue to be subject to liability for breach of
the director's duty of loyalty to ATL or its stockholders, for acts or
omissions not in good faith or involving intentional misconduct or knowing
violations of law, for actions leading to improper personal benefit to the
director, and for payment of dividends or approval of stock repurchases or
redemptions that are unlawful under Delaware law. The provision also does not
affect a director's responsibilities under any other law, such as the federal
securities laws or state or federal environmental laws.
 
  ATL has entered into agreements to indemnify its directors and certain of
its officers in addition to the indemnification provided for in the
Certificate of Incorporation and Bylaws. These agreements, among other things,
require ATL to indemnify its directors and certain of its officers for certain
expenses (including attorneys' fees), judgments, fines and settlement amounts
incurred by such person in any action or proceeding, including any action by
or in the right of ATL, on account of services as a director or officer of
ATL, or as a director or officer of any other company or enterprise to which
the person provides services at the request of ATL.
 
                                      79
<PAGE>
 
1997 STOCK INCENTIVE PLAN
 
  ATL's 1997 Stock Incentive Plan (the "1997 Plan") was adopted by the Board
of Directors and became effective on September 4, 1997 upon adoption by ATL's
stockholders. A total of 200,000 shares of ATL Class A Common Stock have been
authorized for issuance under the 1997 Plan. In no event may any one
participant in the 1997 Plan receive option grants or direct stock issuances
for more than 50,000 shares in the aggregate per calendar year.
 
  The 1997 Plan contains three separate equity incentive programs: (i) a
Discretionary Option Grant Program, (ii) a Stock Issuance Program, and (iii)
an Automatic Option Grant Program. ATL has reserved 200,000 shares of ATL
Class A Common Stock for issuance under the 1997 Plan. In no event may any one
participant in the 1997 Plan be granted stock options, separately exercisable
stock appreciation rights and direct stock issuances for more than 50,000
shares in the aggregate per calendar year. Shares subject to any outstanding
options under the 1997 Plan which expire or otherwise terminate prior to
exercise will be available for subsequent option grants and direct issuances.
Unvested shares issued under the 1997 Plan and subsequently repurchased by
ATL, at the exercise price or direct issue price paid per share, pursuant to
its repurchase rights under the 1997 Plan will also be available for
subsequent issuance. However, shares subject to any option surrendered in
accordance with the stock appreciation right provisions of the 1997 Plan will
not be available for subsequent issuance.
 
  The Compensation Committee of the Board will serve as the initial Plan
Administrator with respect to the Discretionary Option Grant and Stock
Issuance Programs. The term "Plan Administrator" as used herein will mean the
Compensation Committee or any other appointed committee acting within the
scope of its administrative authority under the 1997 Plan. Administration of
the Automatic Option Grant Program will be self-executing in accordance with
the express provisions of such program.
 
  Officers and employees, nonemployee Board members and independent
consultants and advisors in the service of ATL or its parent and subsidiaries
(whether now existing or subsequently established) are eligible to participate
in the Discretionary Option Grant and Stock Issuance Programs. Only
nonemployee members of the Board will be eligible to participate in the
Automatic Option Grant Program.
 
  Discretionary Option Grant Program. The Plan Administrator has complete
discretion under the Discretionary Option Grant Program to determine which
eligible individuals are to receive option grants, the time or times when such
grants are to be made, the number of shares subject to each such grant, the
status of any granted option as either an incentive stock option or a
nonstatutory option under the federal tax laws, the vesting schedule (if any)
to be in effect for the option grant and the maximum term for which any
granted option is to remain outstanding. Each granted option will have an
exercise price per share not less than one hundred percent (100%) of the fair
market value per share of ATL Class A Common Stock on the option grant date,
and no granted option will have a term in excess of ten (10) years. The option
will generally become exercisable in a series of installments over a specified
period of service measured from the grant date. The Plan Administrator is also
authorized to issue tandem stock appreciation rights and limited stock
appreciation rights in connection with option grants made under the
Discretionary Option Grant Program. The Plan Administrator also has the
authority to effect the cancellation of outstanding options under the
Discretionary Option Grant Program and to issue replacement options with an
exercise price equal to the fair market value per share of ATL Class A Common
Stock at the time of the new grant.
 
  Stock Issuance Program. ATL may sell shares of its Class A Common Stock
under the Stock Issuance Program at a price per share not less than one
hundred percent (100%) of their fair market value, payable in cash or through
a promissory note payable to ATL. Shares may also be issued as a bonus for
past services. The shares issued as a bonus for past services will be fully
vested upon issuance. All other shares issued under the program will be
subject to a vesting schedule tied to the performance of service or the
attainment of performance goals. The Plan Administrator will, however, have
the discretionary authority at any time to accelerate the vesting of any and
all unvested shares outstanding under the 1997 Plan.
 
 
                                      80
<PAGE>
 
  Automatic Option Grant Program. Under the Automatic Option Grant Program,
nonemployee Board members will receive option grants at specified intervals
over their period of Board service. Under this program, each individual
serving as a nonemployee Board member on the effective date of the 1997 Plan
will automatically be granted on that date a nonstatutory option to purchase
10,000 shares of ATL Class A Common Stock. Each individual who first becomes a
nonemployee Board member on or after the effective date, whether through
election by the stockholders or appointment by the Board, will automatically
be granted, at the time of such initial election or appointment, a
nonstatutory option to purchase 5,000 shares of ATL Class A Common Stock,
provided such individual has not previously been in ATL's employ.
 
  Each automatic option grant will have an exercise price per share equal to
100% of the fair market value per share of ATL Class A Common Stock on the
grant date and a maximum term of ten years measured from such date. Each
option will be immediately exercisable for all of the option shares. Any
shares purchased under the option will, however, be subject to repurchase by
ATL at the exercise price paid per share upon the optionee's cessation of
Board service prior to vesting in those shares. The shares of ATL Class A
Common Stock subject to each initial 10,000 share grant will vest in a series
of four successive equal annual installments over the optionee's period of
continued Board service measured from the automatic grant date, and the shares
subject to each annual 5,000 share grant will vest in full upon the optionee's
completion of one year of Board service measured from the grant date. Each
automatic option will remain exercisable for a twelve month period following
the optionee's cessation of service as a Board member. In no event, however,
may the option be exercised after the expiration date of the option term.
During the applicable post-service exercise period, the option may not be
exercised for more than the number of option shares (if any) in which the
Board member is vested at the time of his or her cessation of Board service.
The shares subject to each automatic option grant will immediately vest upon
(i) the optionee's death or permanent disability while a Board member, (ii) an
acquisition of ATL by merger or asset sale, (iii) the successful completion of
a tender offer for more than 50% of ATL's outstanding voting stock, or (iv) a
change in the majority of the Board effected through one or more contested
elections for Board membership.
 
                                      81
<PAGE>
 
     SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT OF ATL
 
  The following table sets forth, as of June 24, 1998, the number and
percentage ownership of ATL Common Stock owned by (i) each of the Named
Executive Officers in the Summary Compensation Table which appears elsewhere
herein, (ii) each director of ATL, (iii) all Executive Officers and Directors
of ATL as a group, and (iv) each stockholder of ATL who beneficially owned 5%
of the ATL Common Stock as of June 24, 1998.
 
<TABLE>
<CAPTION>
                                            NUMBER OF SHARES OF
                                             ATL COMMON STOCK    PERCENTAGE OF
NAME OF BENEFICIAL OWNER                   BENEFICIALLY OWNED(1)   CLASS(1)
- ------------------------                   --------------------- -------------
<S>                                        <C>                   <C>
Kevin C. Daly, Ph.D.......................         180,984(2)         1.9%
Chester Baffa.............................          27,331(3)           *
Mark P. Spowart...........................          32,913(3)           *
Steve Morihiro............................          32,378(3)           *
Todd Kreter...............................          25,831(3)           *
Crandall Gudmundson.......................         186,728            1.9%
Joel Slutzky (4)..........................         497,146(5)         5.5%
Thomas L. Thomas..........................             --             --
Paul E. Wright............................          35,145              *
All directors and executive officers as a
 group (11 persons).......................       1,027,771(6)        10.6%
</TABLE>
- --------
 *Less than one percent.
(1) The number of shares beneficially owned and the percentage of shares
    beneficially owned are based on 9,655,000 shares of ATL Class A Common
    Stock and 333 shares of ATL Class B Common Stock outstanding as of July
    31, 1998. Beneficial ownership is determined in accordance with the rules
    and regulations of the Commission. Shares of ATL Common Stock subject to
    options that are currently exercisable or exercisable within 60 days of
    June 24, 1998 are deemed to be outstanding and beneficially owned by the
    person holding such options for the purpose of computing the number of
    shares beneficially owned and the percentage ownership of such person, but
    are not deemed to be outstanding for the purpose of computing the
    percentage ownership of any other person. Except as indicated in the
    footnotes to this table, and subject to applicable community property
    laws, such person have sole voting and investment power with respect to
    all shares of ATL Common Stock shown as beneficially owned by them.
(2) Includes 104,155 shares of ATL Class B Common Stock issuable upon exercise
    of vested options.
(3) Includes 20,833 shares of ATL Class B Common Stock issuable upon exercise
    of vested options.
(4) The address of record for Mr. Slutzky is 1515 South Manchester Avenue,
    Anaheim, California 92802.
(5) Includes 299,257 shares held by the Slutzky Family Trust.
(6) Includes 208,331 shares of ATL Class A Common Stock issuable upon exercise
    of vested options
 
                                      82
<PAGE>
 
             CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS OF ATL
 
  Prior to ATL's initial public offering in March 1997 (the "IPO"), ATL was a
wholly-owned subsidiary of Odetics. As the sole stockholder, Odetics
maintained substantial control over the operations of ATL and provided ATL
with significant management, financial, administrative and other resources,
including treasury, accounting, tax, internal audit, legal, human resources,
sales and marketing and other support services. In May 1997, ATL and Odetics
entered into a Separation and Distribution Agreement, pursuant to which, in
October 1997, Odetics completed a tax free distribution of all of Odetics'
shares of Class A Common Stock of ATL to the stockholders of Odetics.
 
  The Separation and Distribution Agreement set forth the agreements between
ATL and Odetics with respect to the principal corporate transactions required
to effect the IPO, to separate the operations of ATL from Odetics, and to
facilitate the Distribution. Pursuant to this agreement, Odetics sold all
assets related to the business of ATL to ATL, and ATL assumed and agreed to
faithfully perform and fulfill all related liabilities and obligations. All
assets conveyed were transferred for a purchase price equal to their
respective book values, calculated in accordance with generally accepted
accounting principles, which the parties believe was equivalent to the fair
market value thereof.
 
  The Separation and Distribution Agreement also provided for a full and
complete release and discharge after the IPO of all liabilities existing or
arising from all acts and events occurring or failing to occur or alleged to
have occurred or to have failed to occur and all conditions existing or
alleged to have existed on or before the IPO, between or among ATL and its
affiliates, on the one hand, and Odetics and its affiliates, on the other hand
(including any contractual agreements or arrangements existing or alleged to
exist between or among them on or before the IPO), except as expressly set
forth in the Separation and Distribution Agreement.
 
  ATL agreed to indemnify, defend and hold Odetics and its affiliates harmless
from and against all liabilities relating to, arising out of or resulting from
(i) the failure of ATL or any other person to pay, perform or otherwise
promptly discharge any ATL liabilities in accordance with their respective
terms, (ii) ATL's business, or any contract of ATL, (iii) any breach by ATL or
of the Separation and Distribution Agreement or any ancillary agreements, and
(iv) any untrue statement or alleged untrue statement of a material fact or
omission or alleged omission to state a material fact required to be stated
therein or necessary to make the statements therein not misleading, with
respect to all information contained in ATL's Registration Statement on Form
S-1 in connection with the IPO.
 
  Odetics agreed to indemnify, defend and hold ATL and its affiliates harmless
from and against all liabilities relating to, arising out of or resulting from
(i) the failure of Odetics or any other person to pay, perform or otherwise
promptly discharge any liabilities of Odetics, (ii) the business of Odetics or
any contract of Odetics, and (iii) any breach by Odetics or any of its
affiliates of the Separation and Distribution Agreement or any ancillary
agreements. Neither ATL nor Odetics is aware of any liabilities existing as of
the date hereof which would give rise to an indemnification obligation under
the Separation and Distribution Agreement.
 
  The Separation and Distribution Agreement also provided that during the
period prior to the Distribution, ATL would reimburse Odetics for its
proportionate share of premiums paid or accrued on insurance policies under
which ATL had coverage.
 
  In fiscal 1998, ATL was charged and/or allocated expenses of $506,000. The
costs of these services were directly charged and/or allocated using methods
that ATL's management believes are reasonable, although not necessarily
indicative of the costs ATL would have incurred to obtain these services had
it been a separate entity. Neither Odetics nor ATL conducted any study or
obtained any estimates from third parties to determine what the cost of
obtaining such services from third parties may have been.
 
  In October 1997, twelve employees borrowed an aggregate of approximately
$237,000 from Odetics to finance the exercise of options to purchase Class A
Common Stock of Odetics. Such loans were evidenced by
 
                                      83
<PAGE>
 
promissory notes which bear interest at 5.7% per annum and are due and payable
upon the expiration date of the original options, which dates range from
December 1997 to May 2005. Such employees included Kevin C. Daly, ATL's Chief
Executive Officer, President and Chairman of the Board, whose initial
principal balance under such notes was approximately $171,000. In March 1998,
ATL purchased all of these promissory notes from Odetics for an aggregate
purchase price of $244,000. In addition, in July 1998, ATL paid to Odetics
approximately $8.9 million in repayment of outstanding indebtedness owed to
Odetics.
 
                                      84
<PAGE>
 
                       DESCRIPTION OF ATL CAPITAL STOCK
 
  The authorized capital stock of ATL consists of 50,000,000 shares of Common
Stock, $0.0001 par value per share, and 5,000,000 shares of Preferred Stock,
$0.0001 par value per share. The Common Stock is divided into two series,
45,000,000 shares of which are designated Class A Common Stock and 5,000,000
shares of which are designated Class B Common Stock.
 
  ATL Common Stock. As of August 10, 1998, there were 9,655,000 shares of ATL
Class A Common Stock outstanding and 333 shares of ATL Class B Common Stock
outstanding. ATL Class A Common Stock is listed on Nasdaq under the symbol
ATLPA. As of such date, the outstanding ATL Class A Common Stock was held of
record by approximately 736 stockholders. The holders of ATL Class A Common
Stock are entitled to one vote per share on all matters to be voted upon by
the stockholders and the holders of ATL Class B Common Stock are entitled to
one-twentieth of one vote per share held on all such matters as may be
provided by law. Subject to the rights of holders of all classes of stock at
the time outstanding having prior rights as to dividends, the holders of ATL
Common Stock are entitled to receive such dividends, if any, as may be
declared from time to time by the ATL Board out of assets legally available
therefor. In the event of a liquidation, dissolution or winding up of ATL, the
holders of ATL Common Stock are entitled to share ratably in all assets
remaining after payment of liabilities, subject to the rights of holders of
Preferred Stock that may be then outstanding. The ATL Common Stock has no
preemptive or conversion rights or other subscription rights. The ATL Common
Stock is not redeemable, and there are no sinking fund provisions applicable
to it. All outstanding shares of ATL Common Stock are fully paid and non-
assessable.
 
  ATL Preferred Stock. ATL's Certificate of Incorporation authorizes 5,000,000
shares of Preferred Stock. The ATL Board of Directors has the authority to
issue the Preferred Stock in one or more series and to fix the powers,
designations, preferences, and relative, participating, optional or other
rights, if any, or the qualifications, limitations or restrictions thereof,
including dividend rights, dividend rate, conversion rights, voting rights,
rights and terms of redemption (including sinking fund provisions), the
redemption price or prices, liquidation preferences and the number of shares
constituting any series or the designation of such series, without further
vote or action by the stockholders. The issuance of Preferred Stock could have
the effect of delaying, deferring or preventing a change in control of ATL
without further action by the stockholders and could adversely affect the
voting and other rights of the holders of ATL Common Stock, including the loss
of voting control to others. As of August 10, 1998, there were no shares of
ATL Preferred Stock outstanding.
 
  Stockholder Rights Plan. On March 11, 1998, the ATL Board declared a
dividend of one Preferred Share Purchase Right for each outstanding share of
ATL Common Stock. The dividend was payable on March 23, 1998 to the
stockholders of record on that date. Each Right entitles the registered holder
to purchase from ATL one one-thousandth of a share (a "Unit") of Series A
Junior Participating Preferred Stock, par value $.0001 per share (the "Series
A Preferred Stock"), of ATL at a price of $60.00 per Unit (the "Purchase
Price"), subject to adjustment. The description and terms of the Rights are
set forth in a Rights Agreement dated as of March 11, 1998 (the "Rights
Agreement") between ATL and BankBoston, N.A. as Rights Agent.
 
  Currently the rights are transferred with the shares of ATL Common Stock.
Upon the date of occurrence of certain events generally associated with an
unsolicited takeover attempt of ATL or certain transactions involving a change
of control (the "Distribution Date"), the Rights (other than Rights held by an
Acquiring Person (as defined in the Rights Agreement) will become exercisable
and will no longer trade with the Common Stock. The Rights will expire at the
close of business on March 23, 2008, subject to extension or prior redemption
or exchange by ATL. The Purchase Price payable, and the number of Units of
Series A Preferred Stock or other securities or property issuable upon
exercise of the Rights are subject to adjustment from time to time to prevent
dilution upon the occurrence of certain events.
 
  Each Unit of Series A Preferred Stock will be entitled to an aggregate
dividend of 1,000 times the dividend declared per share of ATL Common Stock.
In the event of liquidation, the holders of the Units of Series A Preferred
Stock will be entitled to an aggregate payment of 1,000 times the payment made
per share of ATL
 
                                      85
<PAGE>
 
Common Stock. Each Unit of Series A Preferred Stock will have 1,000 votes,
voting together with the ATL Common Stock. Finally, in the event of any
merger, consolidation or other transaction in which shares of ATL Common Stock
are exchanged, each Unit of Series A Preferred Stock will be entitled to
receive 1,000 times the amount received per share of ATL Common Stock. These
rights are protected by customary antidilution provisions. Because of the
nature of the dividend, liquidation and voting rights, the value of the Units
of Series A Preferred Stock purchasable upon exercise of each Rights should
approximate the value of one share of ATL Common Stock.
 
  In the event that, after the Rights become exercisable, ATL is acquired in a
merger or other business combination transaction with an Acquiring Person or
an affiliate thereof, or 50% or more of its consolidated assets or earning
power are sold to an Acquiring Person or an affiliate thereof, each holder of
a Right will thereafter have the right to receive, upon exercise thereof, that
number of shares of common stock of the acquiring company which at the time of
such transaction will have a market value of two times the exercise price of
the Rights.
 
  In the event that any person or group of affiliated or associated persons
becomes the beneficial owner of 15% or more of the outstanding shares of ATL
Common Stock, each holder of a Right, other than Rights beneficially owned by
the Acquiring Person (which will thereafter be void), will thereafter have the
right to receive upon exercise that number of shares of ATL Common Stock or
Units of Series A Preferred Stock (or cash, other securities or property)
having a market value of two times the exercise price of the Rights.
 
  The Rights have certain anti-takeover effects. The Rights will cause
substantial dilution to a person or group that attempts to acquire ATL on
terms not approved by ATL's Board of Directors, except pursuant to an offer
conditioned on a substantial number of Rights being acquired. The Rights
should not interfere with any merger or other business combination approved by
the ATL Board since the Rights may be redeemed by ATL at the Redemption Price
prior to the occurrence of a Distribution Date. On May 18, 1998, ATL amended
the Rights Plan to permit Quantum to acquire ATL pursuant to the Merger
Agreement without triggering a distribution of Rights.
 
  Transfer Agent and Registrar. The Transfer Agent and Registrar of the ATL
Class A Common Stock is First National Bank of Boston.
 
                                 LEGAL MATTERS
 
  The validity of the shares of Quantum Common Stock to be issued in
connection with the Merger and the federal income tax consequences of the
Merger will be passed upon for Quantum by Wilson Sonsini Goodrich & Rosati
P.C., Palo Alto, California. Certain legal matters in connection with the
Merger Agreement and the federal income tax consequences of the Merger will be
passed upon for ATL by Brobeck, Phleger & Harrison LLP, Irvine, California.
 
                                      86
<PAGE>
 
                                    EXPERTS
 
  The consolidated financial statements and schedule of Quantum appearing in
its Annual Report on Form 10-K for the year ended March 31, 1998, have been
audited by Ernst & Young LLP, independent auditors, as set forth in their
report thereon included therein and incorporated by reference in this Proxy
Statement, which is referred to and made a part of this Prospectus and
Registration Statement, which as to the year ended March 31, 1998 is based in
part on the report of KPMG Peat Marwick LLP, independent auditors. Such
consolidated financial statements are incorporated herein by reference in
reliance upon such report given upon the authority of such firm as experts in
accounting and auditing.
 
  The consolidated and combined financial statements of ATL at March 31, 1998
and 1997 and for each of the three years in the period ended March 31, 1998
included in this Proxy Statement, which is referred to and made a part of this
Prospectus and Registration Statement, have been audited by Ernst & Young LLP,
independent auditors, as set forth in their report thereon appearing elsewhere
herein and are included in reliance upon such report given upon the authority
of such firms as experts in accounting and auditing.
 
  It is expected that representatives of Ernst & Young LLP will be present at
the ATL Special Meeting where they will have an opportunity to respond to
appropriate questions of stockholders and to make a statement if they so
desire.
 
                                      87
<PAGE>
 
                               ATL PRODUCTS, INC.
 
            INDEX TO CONSOLIDATED AND COMBINED FINANCIAL STATEMENTS
 
<TABLE>
<CAPTION>
                                                                           PAGE
                                                                           ----
<S>                                                                        <C>
Consolidated and Combined Financial Statements of ATL Products, Inc.
  Report of Independent Auditors.......................................... F-2
  Consolidated Balance Sheets as of March 31, 1998 and 1997............... F-3
  Consolidated and Combined Statements of Operations for the years ended
   March 31, 1998, 1997 and 1996.......................................... F-4
  Consolidated and Combined Statements of Stockholders' Equity for the
   years ended March 31, 1998, 1997 and 1996.............................. F-5
  Consolidated and Combined Statements of Cash Flows for the years ended
   March 31, 1998, 1997 and 1996.......................................... F-6
  Notes to Consolidated and Combined Financial Statements................. F-7
Unaudited Consolidated Financial Statements
  Unaudited Consolidated Balance Sheet as of June 30, 1998................ F-18
  Unaudited Consolidated Statements of Operations for the three months
   ended June 30, 1998 and June 30, 1997.................................. F-19
  Unaudited Consolidated Statements of Cash Flows for the three months
   ended June 30, 1998 and June 30, 1997.................................. F-20
  Notes to Unaudited Consolidated Financial Statements.................... F-21
</TABLE>
 
                                      F-1
<PAGE>
 
                        REPORT OF INDEPENDENT AUDITORS
 
Stockholders and Board of Directors
ATL Products, Inc.
 
  We have audited the accompanying consolidated balance sheets of ATL
Products, Inc. (the Company), as of March 31, 1998 and 1997, and the related
consolidated and combined statements of operations, stockholders' equity, and
cash flows for each of the three years in the period ended March 31, 1998.
These financial statements are the responsibility of the Company's management.
Our responsibility is to express an opinion on these financial statements
based on our audits.
 
  We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to
obtain reasonable assurance about whether the financial statements are free of
material misstatement. An audit includes examining, on a test basis, evidence
supporting the amounts and disclosures in the financial statements. An audit
also includes assessing the accounting principles used and significant
estimates made by management, as well as evaluating the overall financial
statement presentation. We believe that our audits provide a reasonable basis
for our opinion.
 
  In our opinion, the financial statements referred to above present fairly,
in all material respects, the consolidated financial position of ATL Products,
Inc. at March 31, 1998 and 1997, and the consolidated and combined results of
its operations and its cash flows for each of the three years in the period
ended March 31, 1998, in conformity with generally accepted accounting
principles.
 
                                          /s/ Ernst & Young LLP
 
Orange County, California
April 28, 1998
 
 
                            See accompanying notes.
 
                                      F-2
<PAGE>
 
                               ATL PRODUCTS, INC.
 
                          CONSOLIDATED BALANCE SHEETS
 
 
<TABLE>
<CAPTION>
                                                                 MARCH 31
                                                              ----------------
                                                               1998     1997
                                                              -------  -------
                                                              (IN THOUSANDS)
<S>                                                           <C>      <C>
                           ASSETS
                           ------
Current assets:
  Cash and cash equivalents.................................. $ 1,815  $ 9,494
  Trade accounts receivable, net of allowance for doubtful
   accounts of $511 in March 1998 and $319 in March 1997.....  22,383   12,730
  Inventories:
    Materials and supplies...................................  15,821    8,671
    Work in process..........................................   2,023    1,019
    Finished goods...........................................   4,629    2,937
  Deferred income taxes......................................   2,042      --
  Prepaid expenses and other.................................     898      355
                                                              -------  -------
      Total current assets...................................  49,611   35,206
Leasehold improvements and equipment:
  Leasehold improvements.....................................   1,293      596
  Equipment..................................................   7,075    3,967
  Allowances for depreciation................................  (2,950)  (1,844)
                                                              -------  -------
                                                                5,418    2,719
                                                              -------  -------
      Total assets........................................... $55,029  $37,925
                                                              =======  =======
            LIABILITIES AND STOCKHOLDERS' EQUITY
            ------------------------------------
Current liabilities:
  Trade accounts payable..................................... $15,099  $10,185
  Accrued payroll and related................................   2,733    1,545
  Income taxes payable.......................................   3,474    2,018
  Deferred service income....................................   2,753    1,116
  Other accrued expenses.....................................   1,182    1,199
  Current portion of long-term debt (Note 3).................   3,249    3,249
                                                              -------  -------
      Total current liabilities..............................  28,490   19,312
Long-term debt, less current portion (Note 3)................   9,582    9,748
Commitments and contingencies (Note 8)
Stockholders' equity (Note 7)
  Preferred stock, $.0001 par value:
    Authorized shares--5,000,000
    Issued and outstanding shares--none......................     --       --
  Common stock, $.0001 par value:
    Authorized shares--45,000,000 Class A; 5,000,000 Class
     B.......................................................
    Issued and outstanding shares--9,655,000 Class A at March
     31, 1998 and March 31, 1997; no Class B.................       1        1
  Additional paid in capital.................................  16,927   16,927
  Retained earnings (deficit)................................      29   (8,065)
  Cumulative translation adjustment..........................     --         2
                                                              -------  -------
      Total stockholders' equity.............................  16,957    8,865
                                                              -------  -------
      Total liabilities and stockholders' equity............. $55,029  $37,925
                                                              =======  =======
</TABLE>
 
                            See accompanying notes.
 
                                      F-3
<PAGE>
 
                               ATL PRODUCTS, INC.
 
               CONSOLIDATED AND COMBINED STATEMENTS OF OPERATIONS
 
<TABLE>
<CAPTION>
                                                         YEAR ENDED MARCH 31
                                                       -----------------------
                                                        1998    1997    1996
                                                       ------- ------- -------
                                                        (IN THOUSANDS, EXCEPT
                                                       PER SHARE INFORMATION)
<S>                                                    <C>     <C>     <C>
Net sales:
  Products............................................ $87,910 $53,717 $24,795
  Service and spare parts.............................   9,717   6,311   4,615
                                                       ------- ------- -------
    Total net sales...................................  97,627  60,028  29,410
Cost of sales:
  Products............................................  55,401  32,591  15,682
  Service and spare parts.............................   5,896   3,051   3,181
                                                       ------- ------- -------
    Total cost of sales...............................  61,297  35,642  18,863
                                                       ------- ------- -------
Gross profit..........................................  36,330  24,386  10,547
Expenses:
  Research and development............................   8,370   5,686   1,731
  Sales and marketing.................................  12,239   7,070   3,718
  General and administrative..........................   4,020   3,392   2,948
  Nonrecurring charge (Note 4)........................     --      --    1,392
                                                       ------- ------- -------
Income from operations................................  11,701   8,238     758
Interest expense......................................     992   1,707   1,861
                                                       ------- ------- -------
Income (loss) before income taxes.....................  10,709   6,531  (1,103)
Income taxes (Note 5).................................   2,615   2,600      86
                                                       ------- ------- -------
Net income (loss)..................................... $ 8,094 $ 3,931 $(1,189)
                                                       ======= ======= =======
Basic earnings (loss) per share (Note 1).............. $   .84 $   .48 $  (.15)
                                                       ======= ======= =======
Diluted earnings (loss) per share (Note 1)............ $   .83 $   .48 $  (.15)
                                                       ======= ======= =======
</TABLE>
 
 
                            See accompanying notes.
 
                                      F-4
<PAGE>
 
                               ATL PRODUCTS, INC.
 
          CONSOLIDATED AND COMBINED STATEMENTS OF STOCKHOLDERS' EQUITY
 
<TABLE>
<CAPTION>
                               COMMON STOCK
                         ------------------------
                                       ADDITIONAL RETAINED   CUMULATIVE
                                        PAID IN   EARNINGS   TRANSLATION
                         SHARES AMOUNT  CAPITAL   (DEFICIT)  ADJUSTMENT   TOTAL
                         ------ ------ ---------- ---------  ----------- --------
                                             (IN THOUSANDS)
<S>                      <C>    <C>    <C>        <C>        <C>         <C>
Balance at March 31,
 1995................... 8,005   $  1   $ 1,009   $ (9,848)     $--      $ (8,838)
 Allocation to former
  parent................   --     --        --         (86)      --           (86)
 Net loss...............   --     --        --      (1,189)      --        (1,189)
                         -----   ----   -------   --------      ----     --------
Balance at March 31,
 1996................... 8,005   $  1     1,009    (11,123)      --       (10,113)
 Proceeds from initial
  public offering....... 1,650    --     15,918        --                  15,918
 Allocation to former
  parent................   --     --        --        (873)      --          (873)
 Foreign currency trans-
  lation adjustment        --     --        --         --          2            2
 Net income.............   --     --        --       3,931       --         3,931
                         -----   ----   -------   --------      ----     --------
Balance at March 31,
 1997................... 9,655   $  1    16,927     (8,065)        2        8,865
 Foreign currency trans-
  lation adjustment.....   --     --        --         --         (2)          (2)
 Net income.............   --     --        --       8,094       --         8,094
                         -----   ----   -------   --------      ----     --------
Balance at March 31,
 1998................... 9,655   $  1   $16,927   $     29      $--      $ 16,957
                         =====   ====   =======   ========      ====     ========
</TABLE>
 
 
 
                            See accompanying notes.
 
                                      F-5
<PAGE>
 
                               ATL PRODUCTS, INC.
 
               CONSOLIDATED AND COMBINED STATEMENTS OF CASH FLOWS
 
<TABLE>
<CAPTION>
                                                      YEAR ENDED MARCH 31
                                                    --------------------------
                                                      1998     1997     1996
                                                    --------  -------  -------
                                                         (IN THOUSANDS)
<S>                                                 <C>       <C>      <C>
OPERATING ACTIVITIES
Net income (loss).................................  $  8,094  $ 3,931  $(1,189)
Adjustments to reconcile net income (loss) to net
 cash provided by (used in) operating activities:
  Depreciation and amortization...................     1,905      503      450
  Deferred tax benefit............................    (2,042)     --       --
  Provision for losses on accounts receivable.....       192      343       39
  Foreign currency translation adjustment.........        (2)       2      --
  Changes in operating assets and liabilities
   (Note 10)......................................   (11,855)    (243)  (1,948)
                                                    --------  -------  -------
    Net cash provided by (used in) operating ac-
     tivities.....................................    (3,708)   4,536   (2,648)
INVESTING ACTIVITIES
Purchases of property, plant and equipment........    (3,805)  (2,022)    (498)
FINANCING ACTIVITIES
Proceeds from line of credit and long-term
 borrowings.......................................     9,212      --       --
Principal payments on line of credit and long-term
 debt.............................................    (6,400)     --       --
Principal payments on long-term debt to former
 parent...........................................    (2,978)  (8,939)   3,146
Proceeds from initial public offering.............       --    15,918      --
                                                    --------  -------  -------
    Net cash provided by (used in) financing ac-
     tivities.....................................      (166)   6,979    3,146
                                                    --------  -------  -------
Net change in cash and cash equivalents...........    (7,679)   9,493      --
Cash and cash equivalents at beginning of period..     9,494        1        1
                                                    --------  -------  -------
Cash and cash equivalents at end of period........  $  1,815  $ 9,494  $     1
                                                    ========  =======  =======
</TABLE>
 
 
 
                            See accompanying notes.
 
                                      F-6
<PAGE>
 
                              ATL PRODUCTS, INC.
 
            NOTES TO CONSOLIDATED AND COMBINED FINANCIAL STATEMENTS
 
                                MARCH 31, 1998
 
1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 
  The Company. ATL Products, Inc. (the Company), designs, manufactures,
markets and services automated magnetic libraries used to manage, store and
transfer data in networked computing environments. The Company's customers are
original equipment manufacturers, value added resellers and storage system
integrators located primarily in North America and Europe. The Company has
wholly-owned subsidiaries in the United Kingdom and in Australia, and has a
sales branch office in Japan.
 
  Distribution of Parent Company's Equity Interest in Company. On October 2,
1997, Odetics, Inc., the Company's former parent (Odetics), announced that it
had received a favorable Section 355 distribution ruling from the Internal
Revenue Service allowing it to distribute, on a tax free basis, its 82.9%
ownership of the Company's Class A Common Stock to Odetics stockholders. On
October 31, 1997, Odetics completed the distribution by issuing a dividend of
approximately 1.1 shares of the Company's Class A Common Stock for each share
of Odetics Class A Common Stock and Class B Common Stock outstanding on the
record date.
 
  Basis of Presentation. The accompanying financial statements include the
accounts of the Company and its subsidiaries. Effective December 31, 1996, the
Company's former parent, Odetics, transferred to the Company the portion of
its business that provided worldwide service and support for the Company's
products. The transfer was made at book value and resulted in the Company
obtaining net assets with a carrying value of $2.3 million related to the
service and support operations and a corresponding increase in long-term debt.
The financial information for the service and support operations has been
included in the Company's financial statements for all periods because the
transfer was treated in a manner similar to a pooling of interests for
financial reporting purposes. Additionally, for periods prior to the
establishment of the Company's wholly-owned subsidiary in the United Kingdom,
ATL Products, Ltd. (APL), on July 1, 1996, the Company utilized a subsidiary
of its former parent for administrative services related to the distribution
of its products in Europe. The accompanying financial statements combine the
revenues, costs and expenses incurred by this entity that relate to the
Company's products in all applicable periods in order to present these
activities in a manner similar to a pooling of interests. The net income or
loss from these operations for periods prior to December 31, 1996 has been
retained by Odetics, Inc. and are reflected as "Allocation to former parent"
in the accompanying consolidated and combined statements of stockholders'
equity. Intercompany balances and transactions have been eliminated.
 
  Use of Estimates. The preparation of financial statements in conformity with
generally accepted accounting principles requires management to make estimates
and assumptions that affect the amounts reported in the financial statements
and accompanying notes. Actual results could differ from those estimates.
Significant estimates made in preparing the consolidated financial statements
include the allowance for doubtful accounts, inventory reserves and income tax
valuation allowances.
 
  Revenue Recognition. Sales and related cost of sales are recognized on the
date of shipment.
 
  Inventory Valuation. Inventories are stated at the lower of cost or market.
Cost is determined on the first-in, first-out method.
 
  Leasehold Improvements and Equipment. Leasehold improvements and equipment
are recorded at cost. Leasehold improvements are amortized on a straight-line
basis over the life of the lease. Equipment is depreciated principally by the
declining balance method over its estimated useful lives (four to eight
years).
 
  Long-Lived Assets. Long-lived assets and certain intangibles held and used
by the Company are reviewed for impairment whenever events or changes in
circumstances indicate that the carrying amount of an asset may not be
recoverable. The recoverability test is performed at the lowest level at which
undiscounted net cash flows can be directly attributable to long-lived assets.
 
                                      F-7
<PAGE>
 
                              ATL PRODUCTS, INC.
 
     NOTES TO CONSOLIDATED AND COMBINED FINANCIAL STATEMENTS--(CONTINUED)
 
  Fair Values of Financial Instruments. The fair values of the Company's long-
term debt instruments approximate their carrying value because interest
charges thereon are based on prevailing market rates.
 
  Stock Compensation. The Company has adopted Accounting Principles Board
Opinion No. 25, Accounting for Stock Issued to Employees (APB 25) and related
Interpretations in accounting for its employee stock options because, as
discussed below, the alternative fair value accounting provided for under FASB
Statement No. 123, Accounting for Stock-Based Compensation, requires use of
option valuation models that were not developed for use in valuing employee
stock options. Under APB 25, because the exercise price of the Company's
employee stock options equals the market price of the underlying stock on the
date of grant, no compensation expense is recognized.
 
  To calculate the pro forma information required by Statement 123, the
Company uses the Black-Scholes option pricing model. The Black-Scholes model
was developed for use in estimating the fair value of traded options which
have no vesting restrictions and are fully transferable. In addition, option
valuation models require the input of highly subjective assumptions including
the expected stock price volatility. Because the Company's employee stock
options have characteristics significantly different from those of traded
options, and because changes in the subjective input assumptions can
materially affect the fair value estimate, in management's opinion, the
existing models do not necessarily provide a reliable single measure of the
fair value of its employee stock options.
 
  Earnings Per Share. Earnings per share is computed using weighted average
number of common stock and common stock equivalents outstanding during the
year. In fiscal 1998, the Company adopted FASB Statement No. 128, Earnings Per
Share, which replaced the calculation of primary and fully diluted earnings
per share with basic and diluted earnings per share. Unlike primary earnings
per share, basic earnings per share excludes any dilutive effects of options,
warrants and convertible securities. Diluted earnings per share is similar to
fully diluted earnings per share. All earnings per share amounts for all
periods have been presented to conform with the Statement No. 128 requirements
and the accounting rules set forth in Staff Accounting Bulletin 98 issued by
the Securities and Exchange Commission on February 3, 1998.
 
  The following table sets forth the computation of basic and diluted earnings
(loss) per share:
 
<TABLE>
<CAPTION>
                                                         YEAR ENDED MARCH 31
                                                        ---------------------
                                                         1998   1997   1996
                                                        ------ ------ -------
                                                        (IN THOUSANDS, EXCEPT
                                                              PER SHARE
                                                            INFORMATION)
   <S>                                                  <C>    <C>    <C>
   Numerator: Net income (loss)........................ $8,094 $3,931 $(1,189)
                                                        ====== ====== =======
   Denominator:
     Denominator for basic earnings (loss) per share--
      weighted average shares outstanding..............  9,655  8,118   8,005
   Effect of dilutive securities:
     Employee stock options............................    110     40     --
                                                        ------ ------ -------
     Denominator for diluted earnings (loss) per
      share............................................  9,765  8,158   8,005
                                                        ====== ====== =======
   Basic earnings (loss) per share..................... $ 0.84 $ 0.48 $ (0.15)
                                                        ====== ====== =======
   Diluted earnings (loss) per share................... $ 0.83 $ 0.48 $ (0.15)
                                                        ====== ====== =======
</TABLE>
 
  Research and Development Expenditures. Research and development expenditures
are charged to expense in the period incurred.
 
                                      F-8
<PAGE>
 
                              ATL PRODUCTS, INC.
 
     NOTES TO CONSOLIDATED AND COMBINED FINANCIAL STATEMENTS--(CONTINUED)
 
  Advertising Expenses. The Company expenses advertising costs as incurred.
Advertising expenses totaled $532,000, $434,000 and $121,000 in the fiscal
years ended March 31, 1998, 1997 and 1996, respectively.
 
  Income Taxes. The provision for income taxes consists of the taxes payable
or refundable for the period plus or minus the change during the period in
deferred income tax assets and liabilities. Deferred income tax assets and
liabilities are computed for differences between the financial statement and
tax basis of assets and liabilities based on enacted tax laws and rates
applicable to the period in which differences are expected to affect taxable
income. Valuation allowances are established, when necessary, to reduce
deferred tax assets to amounts which are more likely than not to be realized.
 
  Prior to November 1, 1997, the Company was included in the consolidated
federal income tax return with its former parent, Odetics. The Company and
Odetics had initially entered into a Tax Sharing Agreement pursuant to which
U.S. and state income taxes were computed in accordance with consolidated
return Section 1552(a)(1) of the Internal Revenue Code. Under this allocation,
the consolidated tax liability for a given tax year is allocated only to
companies in the group that have separate taxable income for that year. The
tax liability is allocated pro rata based on each Company's relative separate
taxable income. Companies with losses are not allocated any of the tax
liability and are not given any benefit for their losses. Effective upon the
closing of the Company's initial public offering, the Company entered into a
new Tax Allocation Agreement which was effective retroactively to April 1,
1996, whereby the consolidated federal and state income tax liabilities for a
given tax year were allocated to the companies in the Parent's group according
to their relative separate taxable income for such year. Amounts payable to
Odetics under this arrangement totaled $2,100,000 in fiscal 1998 and
$1,500,000 in fiscal 1997. As of October 31, 1997, in conjunction with
Odetics' distribution of its remaining equity interest in the Company, the Tax
Sharing Agreement was terminated.
 
  Warranty. The Company provides a one year warranty on all products and
records a related provision for estimated warranty costs at the date of sale.
The Company has reserved $493,000, $192,000 and $183,000 representing the
Company's estimated warranty liability at March 31, 1998, 1997 and 1996,
respectively.
 
  Recent Accounting Pronouncements. In June 1997, the FASB issued Statement
No. 130, Reporting Comprehensive Income, which establishes standards for the
reporting and display of comprehensive income and its components in financial
statements. Comprehensive income generally represents all changes in
stockholders' equity except those resulting from investments by distributions
to stockholders. Statement No. 130 is effective for fiscal years beginning
after December 15, 1997 and requires restatement of earlier periods presented.
The Company plans to adopt this statement in fiscal 1999. The effect of
adopting Statement No. 130 will be the inclusion of foreign currency
translation gains and losses as a component of comprehensive income.
 
  Also in June 1997, the FASB issued Statement No. 131, Disclosures about
Segments of an Enterprise and Related Information, which requires publicly-
held companies to report financial and descriptive information about its
operating segments in financial statements issued to stockholders for interim
and annual periods. The statement also requires additional disclosures with
respect to products and services, geographical areas of operations, and major
customers. Statement No. 131 is effective for fiscal years beginning after
December 15, 1997 and requires restatement of earlier periods presented. The
Company plans to adopt this statement in fiscal 1999. Management has not
completed its review of the impact of Statement No. 131 but believes adoption
may effect segment disclosure in future reporting periods.
 
2. TRANSACTIONS WITH FORMER PARENT
 
  The Company and Odetics are parties to an agreement whereby the Company is
charged for certain corporate general and administrative functions. These
charges totaled $506,000, $1,551,000 and $1,534,000 in the years ended March
31, 1998, 1997 and 1996, respectively, and are included in general and
administrative
 
                                      F-9
<PAGE>
 
                              ATL PRODUCTS, INC.
 
     NOTES TO CONSOLIDATED AND COMBINED FINANCIAL STATEMENTS--(CONTINUED)
expense in the accompanying consolidated and combined statements of
operations. These charges consist of certain accounting, auditing, income tax,
payroll and treasury functions, the administration of employee incentive
programs, marketing support, facilities management, certain legal services and
other support services. Charges are allocated to the Company based on actual
amounts incurred on behalf of the Company or agreed upon amounts or
percentages that management of the Company believes are reasonable. Amounts
due to Odetics that are included in accounts payable are $49,000 and $509,000
as of March 31, 1998 and 1997, respectively.
 
  Prior to March 1997, Odetics also managed consolidated domestic cash flows.
Pursuant to that cash management program, the Company transferred any
accumulated cash surplus to Odetics' accounts and Odetics' funded cash
disbursements, as needed, to maintain minimum account balances. The Company
and Odetics also had an agreement whereby the Odetics charged the Company
interest based on the Company's net payable to Odetics using Odetics' cost of
related borrowed funds.
 
  On April 1, 1997, the Company converted the net payable to its former parent
into a promissory note that bears interest at the rate to be equal to Odetics'
cost of borrowing from the lesser of either of Odetics' primary banks or
principal bank (8.5% at March 31, 1998). Principal and interest on this note
is payable in sixteen equal quarterly installments at the end of each calendar
quarter commencing June 30, 1997 and continuing until all principal and
interest have been fully paid. Maturities on the note payable to Odetics are
$3,249,000 in 1999, $3,249,000 in 2000 and $3,250,000 in 2001.
 
3. LONG-TERM DEBT
 
  In March 1998, the Company entered into a new credit facility with Union
Bank of California. This facility includes a $20,000,000 revolving credit
agreement, subject to a maximum borrowing base restriction on the Company's
eligible accounts receivable, and a $6,500,000 term-loan which is available to
the Company on a incremental quarterly basis in order to fund other long-term
debt obligations. The facility provides for borrowings at the lesser of the
bank's prime rate or at LIBOR plus 1.75% to 2.25% depending on the borrowing
level, and is secured by all of the Company's assets. This facility requires
the Company to comply with various financial covenants and includes other
standard loan compliance requirements. Both credit facilities are currently
scheduled to expire in January 2000.
 
  Long-term debt consisted of the following:
 
<TABLE>
<CAPTION>
                                                                  MARCH 31
                                                               ---------------
                                                                1998    1997
                                                               ------- -------
                                                               (IN THOUSANDS)
   <S>                                                         <C>     <C>
   Revolving credit agreement due January 2000 interest pay-
    able monthly 8.5% at March 31, 1998......................  $ 2,000 $   --
   Term-loan due January 2000 interest payable quarterly 8.5%
    at March 31, 1998........................................      812
   Note payable to Odetics (Note 2)..........................   10,019  12,997
                                                               ------- -------
                                                                12,831  12,997
   Less current portion......................................    3,249   3,249
                                                               ------- -------
                                                               $ 9,582 $ 9,748
                                                               ======= =======
</TABLE>
 
  Included in the borrowing limits of the revolving credit agreement, the
Company has available $1,000,000 in standby letters of credit. At March 31,
1998, approximately $485,000 has been reserved for standby letters of credit.
 
                                     F-10
<PAGE>
 
                              ATL PRODUCTS, INC.
 
     NOTES TO CONSOLIDATED AND COMBINED FINANCIAL STATEMENTS--(CONTINUED)
 
4. NONRECURRING CHARGES
 
  In May 1996, the Company and E-Systems, Inc. (E-Systems) settled certain
legal actions each Company had filed against the other related to E-Systems'
cancellation of certain purchase orders for the Company's DataLibrary and
DataTower products. As a result of the settlement the Company recovered the
carrying value of its accounts receivable and inventories related to the E-
Systems litigation and recognized no gain or loss on the settlement. In fiscal
1996, the Company incurred legal fees of $1,392,000 of legal fees associated
with this dispute, which is reflected as a non-recurring charge in the
accompanying financial statements.
 
                                     F-11
<PAGE>
 
                              ATL PRODUCTS, INC.
 
     NOTES TO CONSOLIDATED AND COMBINED FINANCIAL STATEMENTS--(CONTINUED)
 
5. INCOME TAXES
 
  The reconciliation of the income tax provision (benefit) to taxes computed
at the U.S. statutory rate of 35% is as follows:
 
<TABLE>
<CAPTION>
                                                       YEAR ENDED MARCH 31
                                                       ----------------------
                                                        1998     1997   1996
                                                       -------  ------  -----
                                                          (IN THOUSANDS)
   <S>                                                 <C>      <C>     <C>
   Income tax (benefit) at statutory rates............ $ 3,748  $2,286  $(386)
   State income taxes, net of federal benefit.........     571     246    --
   Research and development credit....................    (131)    --     --
   Increase (Decrease) in valuation allowance associ-
    ated with deferred tax assets.....................  (1,474)    133    375
   Foreign income subject to tax......................     --      --      86
   Other..............................................     (99)    (65)    11
                                                       -------  ------  -----
     Total income tax provision....................... $ 2,615  $2,600  $  86
                                                       =======  ======  =====
</TABLE>
 
  United States and foreign income (loss) before income taxes are as follows:
 
<TABLE>
<CAPTION>
                                                        YEAR ENDED MARCH 31
                                                       -----------------------
                                                        1998     1997   1996
                                                       -------  ------ -------
                                                           (IN THOUSANDS)
   <S>                                                 <C>      <C>    <C>
   Pretax income (loss)
     Domestic......................................... $10,540  $6,303 $(1,446)
     Foreign..........................................     169     228     343
                                                       -------  ------ -------
                                                       $10,709  $6,531 $(1,103)
                                                       =======  ====== =======
 
  Significant components of the provision (benefit) for income taxes are as
follows:
 
<CAPTION>
                                                        YEAR ENDED MARCH 31
                                                       -----------------------
                                                        1998     1997   1996
                                                       -------  ------ -------
                                                           (IN THOUSANDS)
   <S>                                                 <C>      <C>    <C>
   Current:
     Federal.......................................... $ 3,760  $2,221 $   --
     State............................................     841     379     --
     Foreign..........................................      56     --       86
                                                       -------  ------ -------
       Total Current.................................. $ 4,657  $2,600 $    86
   Deferred:
     Federal.......................................... $(2,042)
     State............................................     --      --      --
                                                       -------  ------ -------
       Total Deferred................................. $(2,042)    --      --
                                                       -------  ------ -------
       Total income tax provision .................... $ 2,615  $2,600 $    86
                                                       =======  ====== =======
</TABLE>
 
                                     F-12
<PAGE>
 
                              ATL PRODUCTS, INC.
 
     NOTES TO CONSOLIDATED AND COMBINED FINANCIAL STATEMENTS--(CONTINUED)
 
  The components of the deferred tax liabilities and assets are as follows:
 
<TABLE>
<CAPTION>
                                                                 MARCH 31,
                                                               ---------------
                                                                1998    1997
                                                               ------  -------
                                                               (IN THOUSANDS)
   <S>                                                         <C>     <C>
   Deferred tax liabilities:
     Tax over book depreciation............................... $  (26) $   (23)
     Other....................................................    --       (27)
                                                               ------  -------
       Total deferred tax liabilities.........................    (26)     (50)
   Deferred tax assets:
     Inventory reserves.......................................  1,490    1,445
     Deferred compensation and other payroll..................    349      232
     Warranty reserves........................................    196       76
     Bad debt reserve.........................................    172      127
     State taxes..............................................    317      154
     Other....................................................     54      --
                                                               ------  -------
       Total deferred tax assets..............................  2,578    2,034
   Valuation allowance for deferred tax assets................   (510)  (1,984)
                                                               ------  -------
   Net deferred tax assets....................................  2,068       50
                                                               ------  -------
   Net deferred tax assets (liabilities)...................... $2,042  $   --
                                                               ======  =======
</TABLE>
 
  The decrease in the Company's valuation allowance from $1,984,000 at March
31, 1997 to $510,000 at March 31, 1998 is due primarily to the generation of
current year taxable income available for future federal net operating loss
carrybacks.
 
6. EMPLOYEE INCENTIVE PROGRAMS
 
  Effective for the year ended March 31, 1998 the Company's employees
participated in the following Company sponsored incentive programs, a Profit
Sharing Plan, a Section 401(k) Plan and an Associate Stock Ownership Plan.
Prior to October 31, 1997, these incentive programs were sponsored by Odetics.
 
  Under the terms of a Profit Sharing Plan, the Company contributes to a trust
fund such amounts as are determined annually by the Board of Directors. The
Company will make approximately a $225,000 contribution for the fiscal year
ended March 31, 1998 as compared to no contributions in either 1997 or 1996.
 
  The Company's employees participate in a Section 401(k) Plan. Under the
401(k) Plan, eligible employees voluntarily contribute to the plan up to 15%
of their salary through payroll deductions. The Company matches 50% of
contributions up to a stated limit. Under the provisions of the 401(k) Plan,
employees have ten investment choices, one of which is the purchase of the
Company's Class A common stock at market price. Company matching contributions
were approximately $253,000, $123,000 and $115,000 in the years ended March
31, 1998, 1997 and 1996, respectively.
 
  The Company's employees with more than six months of eligible service
participate in a noncontributory Associate Stock Ownership Plan (ASOP). The
ASOP provides that Company contributions, which are determined annually by the
Board of Directors, may be in the form of cash or shares of the Company's
stock. The Company contributions to the ASOP were approximately $0, $144,000
and $98,000 in the years ended March 31, 1998, 1997 and 1996, respectively.
 
                                     F-13
<PAGE>
 
                              ATL PRODUCTS, INC.
 
     NOTES TO CONSOLIDATED AND COMBINED FINANCIAL STATEMENTS--(CONTINUED)
 
  Certain executives of the Company participate in the Odetics' Executive
Deferral Plan under which a portion of their annual compensation may be
deferred. The plan guarantees each executive a minimum annual return of 10%
for deferred amounts up to $20,000 annually through 1994. Effective April 1,
1994, all subsequent deferred amounts and previous annual amounts in excess of
$20,000 have no guaranteed rate of return. Compensation charged to operations
and deferred under the plan totaled $25,000, $25,000 and $20,000 for the years
ended March 31, 1998, 1997 and 1996, respectively.
 
7. COMMON STOCK AND STOCK OPTION PLANS
 
  On December 19, 1996, the Company was reincorporated as a Delaware
corporation and effected a recapitalization in which two classes of common
stock were authorized, consisting of 45,000,000 shares of Class A common stock
and 5,000,000 shares of Class B common stock, and each share of the Company's
no par common stock was recapitalized into 8,005 shares of Class A common
stock, par value $.0001 per share. All share and per share information
included in the accompanying financial statements has been restated to reflect
the reincorporation and the stock split. Class A and Class B common stock are
identical in all respects except for voting rights. The Class A common stock
has one vote per share while Class B common stock has .05 of one vote per
share. The Class B common stock is not convertible into Class A common stock.
 
  On March 13, 1997, the Company completed an initial public offering
consisting of 1,650,000 shares of the Company's Class A Common Stock, at an
offering price of $11 per share (Offering). From the net proceeds of the
Offering of approximately $15,918,000, the Company used $6,752,000 to repay a
portion of Company's indebtedness to Odetics.
 
  The Company's Board of Directors has adopted and approved the ATL Products,
Inc. 1996 Stock Incentive Plan (the 1996 Plan), and authorized 2,000,000
shares of the Company's Class B common stock for issuance under the 1996 Plan.
In November 1997, the Company's Board of Directors adopted and approved the
1997 Stock Incentive Plan (the 1997 Plan) and authorized 200,000 shares of the
Company's Class A Common Stock for issuance under the 1997 Plan. In connection
with the adoption of the 1997 Plan, the Board of Directors canceled 1,151,500
shares available for grant under the 1996 Plan. Under terms of the Plans,
eligible key employees, directors and consultants can receive options to
purchase shares of the Company's common stock at prices not less than 100% for
incentive stock options and not less than 85% for nonqualified stock options
of the fair value on the date of grant as determined by the Board of
Directors. Options vest over a three year period and expire ten years after
date of grant or 90 days after termination of employment.
 
                                     F-14
<PAGE>
 
                              ATL PRODUCTS, INC.
 
     NOTES TO CONSOLIDATED AND COMBINED FINANCIAL STATEMENTS--(CONTINUED)
 
  Activity under the 1996 and 1997 Plans are set forth below:
 
<TABLE>
<CAPTION>
                                                     OPTIONS OUTSTANDING
                                               --------------------------------
                                                                      WEIGHTED-
                                     SHARES                            AVERAGE
                                   AVAILABLE   NUMBER OF   PRICE PER  EXERCISE
                                   FOR GRANT    SHARES       SHARE      PRICE
                                   ----------  ---------  ----------- ---------
   <S>                             <C>         <C>        <C>         <C>
   Balance at March 31, 1996......        --         --   $       --    $ --
   Additional shares reserved.....  2,000,000        --           --      --
   Options granted................   (879,000)   879,000         5.00    5.00
                                   ----------  ---------  -----------   -----
   Balance at March 31, 1997......  1,121,000    879,000         5.00    5.00
   Shares canceled................ (1,152,166)       --           --      --
   Additional shares reserved.....    200,000        --           --      --
   Options granted................   (187,300)   187,300   9.13-16.50    9.65
   Options canceled...............     31,166    (31,166)        5.00    5.00
                                   ----------  ---------  -----------   -----
   Balance at March 31, 1998......     12,700  1,035,134  $5.00-16.50   $5.82
                                   ==========  =========  ===========   =====
</TABLE>
 
  The weighted average remaining contractual life and weighted average
exercise price of options outstanding and of options exercisable as March 31,
1998 were as follows:
 
<TABLE>
<CAPTION>
                                         OUTSTANDING                  EXERCISABLE
                            ------------------------------------- --------------------
                                        WEIGHTED AVERAGE WEIGHTED             WEIGHTED
     RANGE OF                NUMBER OF     REMAINING     AVERAGE              AVERAGE
     EXERCISE                 SHARES    CONTRACTUAL LIFE EXERCISE   SHARES    EXERCISE
      PRICES                OUTSTANDING     (YEARS)       PRICE   EXERCISABLE  PRICE
     --------               ----------- ---------------- -------- ----------- --------
   <S>                      <C>         <C>              <C>      <C>         <C>
   $5.00...................   847,834         8.76        $ 5.00    366,000    $ 5.00
   $9.13-$11.06............   171,000         9.67          9.13        --       9.13
   $12.94-$15.75...........    16,300         9.83         15.08        --      15.08
</TABLE>
 
  In calculating pro forma information regarding net income and earnings per
share, as required by Statement No. 123, the fair value was estimated at the
date of grant using a Black-Scholes option pricing model with the following
weighted-average assumptions for the options on the Company's Class A and
Class B common stock: risk-free interest rate of 6.0%; a dividend yield of 0%;
volatility of the expected market price of the Company's common stock of .36;
and a weighted-average expected life of the option of 4 years.
 
  For purposes of pro forma disclosures, the estimated fair value of the
options is amortized to expense over the options' vesting period. The
Company's pro forma information is as follows:
 
<TABLE>
<CAPTION>
                                                                MARCH 31,
                                                          ---------------------
                                                             1998       1997
                                                          ---------- ----------
   <S>                                                    <C>        <C>
   Pro forma net income.................................. $7,518,000 $3,831,000
   Pro forma net income per share........................ $      .77 $      .47
</TABLE>
 
  On March 12, 1998, the Company's Board of Directors adopted a Stockholder
Rights Plan. Under terms of the Plan, preferred stock purchase rights will be
distributed as a dividend at the rate of one Right for each share of Common
Stock held as of the close of business on March 23, 1998. The rights are
designed to guard against partial tender offers and other abusive and coercive
tactics that might be used in an attempt to gain control of the Company
without paying all stockholders a fair price for their shares. The Rights will
not prevent a takeover attempt, but should encourage anyone seeking to acquire
the Company to negotiate with the Company's Board of Directors prior to
attempting a takeover. Each Right entitles the Company's stockholders to buy
one one-thousandth of a share of Series A Preferred stock of the Company at an
exercise price of $60.00. In general, the
 
                                     F-15
<PAGE>
 
                              ATL PRODUCTS, INC.
 
     NOTES TO CONSOLIDATED AND COMBINED FINANCIAL STATEMENTS--(CONTINUED)
Rights will be exercisable only if a person or group acquire 15% of more of
the Company's Common Stock. Although these Rights are not intended to prevent
a takeover, any Rights Plan could be considered to delay or make a merger,
tender offer, or proxy contest more difficult thereby potentially adversely
affecting the market price of the Company's Common Stock.
 
8. COMMITMENTS AND CONTINGENCIES
 
  The Company leases manufacturing and various office facilities under
operating leases. Lease terms generally range from 5 to 15 years with options
to renew at varying terms. Annual commitments under these leases at March 31,
1998 are as follows:
 
<TABLE>
<CAPTION>
        FISCAL YEAR
        -----------                                               (IN THOUSANDS)
        <S>                                                       <C>
        1999.....................................................     $  988
        2000.....................................................      1,033
        2001.....................................................      1,077
        2002.....................................................      1,122
        2003.....................................................      1,166
        Thereafter...............................................      1,794
                                                                      ------
                                                                      $7,180
                                                                      ======
</TABLE>
 
  Total rent expense was $1,076,000, $469,000 and $265,000 in the years ended
March 31, 1998, 1997 and 1996.
 
9. SIGNIFICANT CUSTOMER AND SEGMENT INFORMATION
 
  The Company operates in a single industry segment; namely, the design,
manufacturing, marketing and servicing of automated magnetic tape libraries.
Sales to individual customers in excess of 10% of total net sales in the years
ended March 31, 1998, 1997 and 1996 are as follows:
 
<TABLE>
<CAPTION>
                                                           YEAR ENDED MARCH 31,
                                                           ---------------------
        CUSTOMER                                            1998    1997   1996
        --------                                           ------- ------ ------
                                                              (IN THOUSANDS)
        <S>                                                <C>     <C>    <C>
        A................................................. $12,867 $5,328 $5,603
        B................................................. $15,952 $2,221    --
</TABLE>
 
  The Company performs periodic credit evaluations of its customers' financial
condition and generally does not require collateral. Credit losses have been
within management's expectations and within amounts provided through the
allowance for doubtful accounts.
 
  Information regarding the Company's activities by geographical region are as
follows:
 
<TABLE>
<CAPTION>
                                                                 NORTH
                                                                AMERICA EUROPE
                                                                ------- -------
                                                                (IN THOUSANDS)
   <S>                                                          <C>     <C>
   YEAR ENDED MARCH 31, 1998
   Sales....................................................... $83,805 $13,822
   Net income..................................................   7,981     113
   Identifiable assets.........................................  50,343   4,686
   YEAR ENDED MARCH 31, 1997
   Sales....................................................... $50,572 $ 9,456
   Net income..................................................   3,716     215
   Identifiable assets.........................................  34,951   2,974
</TABLE>
 
                                     F-16
<PAGE>
 
                              ATL PRODUCTS, INC.
 
     NOTES TO CONSOLIDATED AND COMBINED FINANCIAL STATEMENTS--(CONTINUED)
 
  Prior to July 1, 1996 the Company had no foreign operations. All products
sold by the Company's subsidiary in Europe are acquired from ATL at agreed
upon transfer prices.
 
  Export sales to unaffiliated foreign customers approximated $14.2 million in
fiscal 1998 and were less than 10 percent of net sales in fiscal 1997 and
1996.
 
  An integral component of the Company's products is a data library tape drive
that is available from a single supplier. Demand for the supplier tape drives
is high and it is possible that in the near term the supply of tape drives
could be disrupted. Any disruption of the supply of tape drives would cause
delays in production that may be detrimental to the Company's financial
performance.
 
10. SUPPLEMENTAL CASH FLOW INFORMATION
 
<TABLE>
<CAPTION>
                                                     YEAR ENDED MARCH 31
                                                   --------------------------
                                                     1998     1997     1996
                                                   --------  -------  -------
                                                        (IN THOUSANDS)
<S>                                                <C>       <C>      <C>
Net cash used in changes in operating assets and
 liabilities
  Increase in accounts receivable................. $ (9,845) $(2,914) $(5,786)
  (Increase) decrease in inventories..............  (10,645)  (7,310)     262
  (Increase) decrease in prepaid expenses and
   other assets...................................     (543)    (284)      38
  Increase in accounts payable and accrued ex-
   penses.........................................    9,178   10,265    3,538
                                                   --------  -------  -------
Net cash used in changes in operating assets and
 liabilities...................................... $(11,855) $  (243) $(1,948)
                                                   ========  =======  =======
<CAPTION>
                                                     YEAR ENDED MARCH 31
                                                   --------------------------
                                                     1998     1997     1996
                                                   --------  -------  -------
                                                        (IN THOUSANDS)
<S>                                                <C>       <C>      <C>
Cash paid during the year:
  Interest........................................ $    938      --       --
  Income taxes paid...............................    3,166      --       --
</TABLE>
 
                                     F-17
<PAGE>
 
                               ATL PRODUCTS, INC.
 
                      UNAUDITED CONSOLIDATED BALANCE SHEET
 
<TABLE>
<CAPTION>
                                                                    JUNE 30,
                                                                      1998
                                                                 --------------
                                                                 (IN THOUSANDS)
<S>                                                              <C>
                             ASSETS
Current assets:
  Cash..........................................................    $   970
  Trade accounts receivable, net of allowance for doubtful ac-
   counts of $628 in June 1998 and $511 in March 1998...........     24,602
  Inventories:
    Materials and supplies......................................     16,171
    Work in process.............................................      2,273
    Finished goods..............................................      4,900
  Deferred income taxes.........................................      2,042
  Prepaid expenses and other....................................      1,083
                                                                    -------
      Total current assets......................................     52,041
Leasehold improvements and equipment:
  Leasehold improvements........................................      1,418
  Equipment.....................................................      7,362
  Allowances for depreciation...................................     (3,331)
                                                                    -------
                                                                      5,449
                                                                    -------
      Total assets..............................................    $57,490
                                                                    =======
              LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
  Trade accounts payable........................................    $ 9,165
  Accrued payroll and related...................................      2,973
  Income taxes payable..........................................      1,371
  Deferred service income.......................................      3,115
  Other accrued expenses........................................      1,500
  Current portion of long-term debt.............................      4,873
                                                                    -------
      Total current liabilities.................................     22,997
Long-term debt, less current portion............................     15,637
Stockholders' equity:
  Preferred Stock, $.0001 par value:
    Authorized shares-- 5,000,000
    Issued and outstanding shares-- none........................        --
  Common Stock, $.0001 par value:
    Authorized shares - 45,000,000 Class A; 5,000,000 Class B
    Issued and outstanding shares - 9,655,000 at June 30, 1998;
     333 at June 30, 1998.......................................          1
Additional paid in capital......................................     16,927
Retained earnings...............................................      1,930
Cumulative translation adjustment...............................         (2)
                                                                    -------
    Total stockholders' equity..................................     18,856
                                                                    =======
      Total liabilities and stockholders' equity................    $57,490
                                                                    =======
</TABLE>
 
                                      F-18
<PAGE>
 
                               ATL PRODUCTS, INC.
 
                UNAUDITED CONSOLIDATED STATEMENTS OF OPERATIONS
                  (IN THOUSANDS, EXCEPT PER SHARE INFORMATION)
 
<TABLE>
<CAPTION>
                                                             THREE MONTHS ENDED
                                                                  JUNE 30,
                                                             -------------------
                                                               1998      1997
                                                             --------- ---------
<S>                                                          <C>       <C>
Net sales:
  Products.................................................. $  28,625 $  16,677
  Service and spare parts...................................     4,364     1,890
                                                             --------- ---------
      Total net sales.......................................    32,989    18,567
Cost of sales:
  Products..................................................    19,114     9,973
  Service and spare parts...................................     2,803     1,215
                                                             --------- ---------
      Total cost of sales...................................    21,917    11,188
                                                             --------- ---------
Gross profit................................................    11,072     7,379
Expenses:
  Research and development..................................     2,658     1,761
  Sales and marketing.......................................     3,971     2,698
  General and administrative................................     1,266       661
                                                             --------- ---------
Income from operations......................................     3,177     2,259
Interest expense and other..................................       253       276
                                                             --------- ---------
Income before income taxes..................................     2,924     1,983
Income taxes................................................     1,023       793
                                                             --------- ---------
Net income.................................................. $   1,901 $   1,190
                                                             ========= =========
Basic earnings per share.................................... $    0.20 $    0.12
                                                             ========= =========
Diluted earnings per share.................................. $    0.19 $    0.12
                                                             ========= =========
</TABLE>
 
                                      F-19
<PAGE>
 
                               ATL PRODUCTS, INC.
 
                UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS
                                 (IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                           THREE MONTHS ENDED
                                                                JUNE 30,
                                                           --------------------
                                                             1998       1997
                                                           ---------  ---------
<S>                                                        <C>        <C>
OPERATING ACTIVITIES
Net income...............................................  $   1,901  $  1,190
Adjustments to reconcile net income to net cash used in
 operating activities:
  Depreciation and amortization..........................        688       347
  Provision for losses on accounts receivable............        117        60
  Foreign currency translation adjustment................         (2)      (11)
Changes in operating assets and liabilities:
  Increase in accounts receivable........................     (2,336)   (1,767)
  Increase in inventories................................     (1,177)     (343)
  (Increase) decrease in prepaid expenses and other as-
   sets..................................................       (185)      102
  Decrease in accounts payable and accrued expenses......     (7,117)   (5,713)
                                                           ---------  --------
Net cash used in operating activities....................     (8,111)   (6,135)
INVESTING ACTIVITIES
Purchases of leasehold improvements and equipment........       (413)     (550)
FINANCING ACTIVITIES
Proceeds from line of credit and long-term borrowings....     29,148       --
Principal payments on line of credit and long-term debt..    (21,469)     (644)
                                                           ---------  --------
Net cash provided by (used in) financing activities......      7,679      (644)
                                                           ---------  --------
Net change in cash and cash equivalents..................       (845)   (7,329)
Cash and cash equivalents at beginning of period.........      1,815     9,494
                                                           ---------  --------
Cash and cash equivalents at end of period...............  $     970  $  2,165
                                                           =========  ========
</TABLE>
 
                                      F-20
<PAGE>
 
                              ATL PRODUCTS, INC.
 
             NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS
                                 JUNE 30, 1998
 
NOTE A -- BASIS OF PRESENTATION
 
  The accompanying unaudited consolidated financial statements have been
prepared in accordance with generally accepted accounting principles for
interim financial information and with the instructions to Article 10 of
Regulation S-X. Accordingly, they do not include all of the information and
footnotes required by generally accepted accounting principles for complete
financial statements. In the opinion of management, all adjustments
(consisting of normal recurring accruals) considered necessary for a fair
presentation have been included. Operating results for the three month period
ended June 30, 1998 are not necessarily indicative of the results that may be
expected for the fiscal year ending March 31, 1999. For further information,
refer to the consolidated and combined financial statements and footnotes
thereto,  included elsewhere in this Proxy Statement/Prospectus.
 
NOTE B -- EARNINGS PER SHARE
 
  Earnings per share is computed using weighted average number of common stock
and common stock equivalents outstanding during the year. In fiscal 1998, the
Company adopted FASB Statement No. 128, Earnings Per Share, which replaced the
calculation of primary and fully diluted earnings per share with basic and
diluted earnings per share. Unlike primary earnings per share, basic earnings
per share excludes any dilutive effects of options, warrants and convertible
securities. Diluted earnings per share is similar to fully diluted earnings
per share. All earnings per share amounts for all periods have been presented
to conform with the Statement No. 128 requirements and the accounting rules
set forth in Staff Accounting Bulletin 98 issued by the Securities and
Exchange Commission on February 3, 1998.
 
  The following table sets forth the computation of basic and diluted earnings
per share (in thousands, except per share information):
 
<TABLE>
<CAPTION>
                                                            THREE MONTHS ENDED
                                                                  JUNE 30
                                                            -------------------
                                                              1998      1997
                                                            --------- ---------
   <S>                                                      <C>       <C>
   Numerator: Net income..................................  $   1,901 $   1,190
                                                            ========= =========
   Denominator:
   Denominator for basic earnings per share weighted aver-
    age shares outstanding................................      9,655     9,655
   Effect of dilutive securities:
   Employee stock options.................................        603       --
                                                            --------- ---------
   Denominator for diluted earnings per share.............     10,258     9,655
                                                            ========= =========
   Basic earnings per share...............................  $    0.20 $    0.12
                                                            ========= =========
   Diluted earnings per share.............................  $    0.19 $    0.12
                                                            ========= =========
</TABLE>
 
NOTE C -- COMPREHENSIVE INCOME
 
  As of April 1, 1998, the Company adopted FASB Statement No. 130 "Reporting
Comprehensive Income." Statement No. 130 establishes new rules for the
reporting and display of comprehensive income and its components; however, the
adoption of this Statement had no material impact on the Company's net income
or stockholders' equity. Statement No. 130 requires foreign currency
translation adjustments, which prior to adoption were reported separately in
stockholders' equity to be included in other comprehensive income.
 
                                     F-21
<PAGE>
 
  The components of comprehensive income for the three months ended June 30,
1998 and June 30, 1997 are as follows:
 
<TABLE>
<CAPTION>
                                                                   1998   1997
                                                                  ------ ------
   <S>                                                            <C>    <C>
   Net income.................................................... $1,901 $1,190
   Foreign currency translation adjustment.......................      2    --
                                                                  ------ ------
   Comprehensive income.......................................... $1,903 $1,190
                                                                  ====== ======
</TABLE>
 
NOTE D -- LONG-TERM DEBT
 
  The Company has a credit facility with Union Bank of California. This
facility includes a $20,000,000 revolving credit agreement, subject to a
maximum borrowing base restriction on the Company's eligible accounts
receivable, and a $6,500,000 term-loan which is available to the Company on a
incremental quarterly basis in order to fund other long-term debt obligations.
The facility provides for borrowings at the lesser of the bank's prime rate or
at LIBOR plus 1.75% to 2.25% depending on the borrowing level, and is secured
by all of the Company's assets. This facility requires the Company to comply
with various financial covenants and includes other standard loan compliance
requirements.
 
  Long-term debt consisted of the following:
 
<TABLE>
<CAPTION>
                                                           JUNE 30, MARCH 31,
                                                             1998     1998
                                                           -------- ---------
                                                             (IN THOUSANDS)
   <S>                                                     <C>      <C>
   Revolving credit agreement due January 2000 interest
    payable monthly 8.5% at June 30, 1998................. $ 9,950   $2,000
   Term-loan due November 1998 interest payable quarterly
    7.9% at June 30, 1998.................................   1,624      812
   Note payable to Odetics................................   8,936   10,019
                                                           -------   ------
                                                            20,510   12,831
   Less current portion...................................   4,873    3,249
                                                           -------   ------
                                                           $15,637   $9,582
                                                           =======   ======
</TABLE>
 
  Included in the borrowing limits of the revolving credit agreement, the
Company has available $1,000,000 in standby letters of credit. At June 30,
1998, approximately $485,000 has been reserved for standby letters of credit.
 
                                     F-22
<PAGE>
 
                                                                      APPENDIX A
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
 
 
 
 
 
                      AGREEMENT AND PLAN OF REORGANIZATION
 
                                  BY AND AMONG
 
                              QUANTUM CORPORATION,
 
                         QUICK ACQUISITION CORPORATION
 
                                      AND
 
                               ATL PRODUCTS, INC.
 
                                  MAY 18, 1998
 
 
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                                          PAGE
                                                                          ----
 <C>         <S>                                                          <C>
 ARTICLE I   THE MERGER.................................................   A-1
  1.1        The Merger.................................................   A-1
  1.2        Effective Time; Closing....................................   A-1
  1.3        Effect of the Merger.......................................   A-2
  1.4        Certificate of Incorporation; Bylaws.......................   A-2
  1.5        Directors and Officers.....................................   A-2
  1.6        Effect on Capital Stock....................................   A-2
  1.7        Surrender of Certificates..................................   A-3
  1.8        No Further Ownership Rights in Company Common Stock........   A-4
  1.9        Lost, Stolen or Destroyed Certificates.....................   A-4
  1.10       Tax and Accounting Consequences............................   A-5
  1.11       Taking of Necessary Action; Further Action.................   A-5
 ARTICLE II  REPRESENTATIONS AND WARRANTIES OF COMPANY..................   A-5
  2.1        Organization of Company....................................   A-5
  2.2        Company Capital Structure..................................   A-5
  2.3        Obligations With Respect to Capital Stock..................   A-6
  2.4        Authority..................................................   A-6
  2.5        SEC Filings; Company Financial Statements..................   A-7
  2.6        Absence of Certain Changes or Events.......................   A-8
  2.7        Taxes......................................................   A-8
  2.8        Title to Properties; Absence of Liens and Encumbrances.....  A-10
  2.9        Intellectual Property......................................  A-10
  2.10       Compliance; Permits; Restrictions..........................  A-12
  2.11       Litigation.................................................  A-12
  2.12       Brokers' and Finders' Fees.................................  A-12
  2.13       Employee Benefit Plans.....................................  A-13
  2.14       Environmental Matters......................................  A-15
  2.15       Agreements, Contracts and Commitments......................  A-16
  2.16       Change of Control Payments.................................  A-17
  2.17       Statements; Proxy Statement/Prospectus.....................  A-17
  2.18       Board Approval.............................................  A-17
  2.19       Fairness Opinion...........................................  A-18
  2.20       Section 203 of the Delaware General Corporation Law Not
             Applicable.................................................  A-18
  2.21       Customs....................................................  A-18
 ARTICLE III REPRESENTATIONS AND WARRANTIES OF PARENT AND MERGER SUB....  A-18
  3.1        Organization of Parent and Merger Sub......................  A-18
  3.2        Parent and Merger Sub Capital Structure....................  A-18
  3.3        Authority..................................................  A-19
  3.4        SEC Filings; Parent Financial Statements...................  A-19
  3.5        Absence of Certain Changes or Events.......................  A-20
  3.6        Statements; Proxy Statement/Prospectus.....................  A-20
  3.7        Litigation.................................................  A-20
 ARTICLE IV  CONDUCT PRIOR TO THE EFFECTIVE TIME........................  A-21
  4.1        Conduct of Business by Company.............................  A-21
  4.2        Conduct of Business by Parent..............................  A-22
 ARTICLE V   ADDITIONAL AGREEMENTS......................................  A-23
  5.1        Proxy Statement/Prospectus; Registration Statement; Other
             Filings; Board Recommendations............................   A-23
  5.2        Meeting of Company Stockholders............................  A-24
  5.3        Confidentiality; Access to Information.....................  A-25
</TABLE>

<PAGE>
 
                         TABLE OF CONTENTS--(CONTINUED)
 
<TABLE>
<CAPTION>
                                                                          PAGE
                                                                          ----
 <C>          <S>                                                         <C>
  5.4         No Solicitation...........................................  A-25
  5.5         Public Disclosure.........................................  A-26
  5.6         Reasonable Efforts; Notification..........................  A-26
  5.7         Third Party Consents......................................  A-27
  5.8         Stock Options and Employee Benefits.......................  A-27
  5.9         Form S-8..................................................  A-28
  5.10        Indemnification...........................................  A-28
  5.11        Nasdaq Listing............................................  A-29
  5.12        Company Affiliate Agreement...............................  A-29
  5.13        Regulatory Filings; Reasonable Efforts....................  A-29
  5.14        Comfort Letter............................................  A-29
 ARTICLE VI   CONDITIONS TO THE MERGER..................................  A-30
                   Conditions to Obligations of Each Party to Effect the
  6.1         Merger....................................................  A-30
  6.2         Additional Conditions to Obligations of Company...........  A-30
                  Additional Conditions to the Obligations of Parent and
  6.3         Merger Sub................................................  A-31
 ARTICLE VII  TERMINATION, AMENDMENT AND WAIVER.........................  A-32
  7.1         Termination...............................................  A-32
  7.2         Notice of Termination; Effect of Termination..............  A-33
  7.3         Fees and Expenses.........................................  A-33
  7.4         Amendment.................................................  A-34
  7.5         Extension; Waiver.........................................  A-34
 ARTICLE VIII GENERAL PROVISIONS........................................  A-34
  8.1         Non-Survival of Representations and Warranties............  A-34
  8.2         Notices...................................................  A-34
  8.3         Interpretation; Knowledge.................................  A-35
  8.4         Counterparts..............................................  A-35
  8.5         Entire Agreement; Third Party Beneficiaries...............  A-36
  8.6         Severability..............................................  A-36
  8.7         Other Remedies; Specific Performance......................  A-36
  8.8         Governing Law.............................................  A-36
  8.9         Rules of Construction.....................................  A-36
  8.10        Assignment................................................  A-36
  8.11        Waiver of Jury Trial......................................  A-36
</TABLE>
 
                               INDEX OF EXHIBITS
 
<TABLE>
 <C>         <S>                                        <C>
 Exhibit A   Form of Voting Agreement
 Exhibit B   Form of Affiliate Agreement
 Exhibit C-1 Persons to Sign Noncompetition Agreement
 Exhibit C-2 Form of Noncompetition Agreement
</TABLE>

<PAGE>
 
                     AGREEMENT AND PLAN OF REORGANIZATION
 
  This AGREEMENT AND PLAN OF REORGANIZATION is made and entered into as of May
18, 1998, among Quantum Corporation, a Delaware corporation ("Parent"), Quick
Acquisition Corporation, a Delaware corporation and a wholly-owned subsidiary
of Parent ("Merger Sub"), and ATL Products, Inc., a Delaware corporation
("Company").
 
                                   RECITALS
 
  A. Upon the terms and subject to the conditions of this Agreement (as
defined in Section 1.2 below) and in accordance with the Delaware General
Corporation Law ("Delaware Law"), Parent and Company intend to enter into a
business combination transaction.
 
  B. The Board of Directors of Company (i) has determined that the Merger (as
defined in Section 1.1) is consistent with and in furtherance of the long-term
business strategy of Company and fair to, and in the best interests of,
Company and its stockholders, (ii) has approved this Agreement, the Merger and
the other transactions contemplated by this Agreement and (iii) has determined
to recommend that the stockholders of Company adopt and approve this Agreement
and approve the Merger.
 
  C. Concurrently with the execution of this Agreement, and as a condition and
inducement to Parent's willingness to enter into this Agreement, certain
affiliates of Company are entering into Voting Agreements in substantially the
form attached hereto as Exhibit A (the "Company Voting Agreements").
 
  D. The parties intend, by executing this Agreement, to adopt a plan of
reorganization within the meaning of Section 368 of the Internal Revenue Code
of 1986, as amended (the "Code").
 
  E. It is also intended by the parties hereto that the Merger shall be
treated as a purchase for accounting purposes.
 
  NOW, THEREFORE, in consideration of the covenants, promises and
representations set forth herein, and for other good and valuable
consideration, the receipt and sufficiency of which are hereby acknowledged,
the parties agree as follows:
 
                                   ARTICLE I
 
                                  THE MERGER
 
  1.1 The Merger. At the Effective Time (as defined in Section 1.2) and
subject to and upon the terms and conditions of this Agreement and the
applicable provisions of Delaware Law, Merger Sub shall be merged with and
into Company (the "Merger"), the separate corporate existence of Merger Sub
shall cease and Company shall continue as the surviving corporation. Company
as the surviving corporation after the Merger is hereinafter sometimes
referred to as the "Surviving Corporation."
 
  1.2 Effective Time; Closing. Subject to the provisions of this Agreement,
the parties hereto shall cause the Merger to be consummated by filing a
Certificate of Merger with the Secretary of State of the State of Delaware in
accordance with the relevant provisions of Delaware Law (the "Certificate of
Merger") (the time of such filing (or such later time as may be agreed in
writing by Company and Parent and specified in the Certificate of Merger)
being the "Effective Time") as soon as practicable on or after the Closing
Date (as herein defined). Unless the context otherwise requires, the term
"Agreement" as used herein refers collectively to this Agreement and Plan of
Reorganization and the Certificate of Merger. The closing of the Merger (the
"Closing") shall take place at the offices of Wilson Sonsini Goodrich &
Rosati, Professional Corporation, at a time and date to be specified by the
parties, which shall be no later than the second business day after the
satisfaction or waiver of the conditions set forth in Article VI, or at such
other time, date and location as the parties hereto agree in writing (the
"Closing Date").
 
                                      A-1
<PAGE>
 
  1.3 Effect of the Merger. At the Effective Time, the effect of the Merger
shall be as provided in this Agreement and the applicable provisions of
Delaware Law. Without limiting the generality of the foregoing, and subject
thereto, at the Effective Time all the property, rights, privileges, powers
and franchises of Company and Merger Sub shall vest in the Surviving
Corporation, and all debts, liabilities and duties of Company and Merger Sub
shall become the debts, liabilities and duties of the Surviving Corporation.
 
  1.4 Certificate of Incorporation; Bylaws.
 
  (a) At the Effective Time, the Certificate of Incorporation of Merger Sub,
as in effect immediately prior to the Effective Time, shall be the Certificate
of Incorporation of the Surviving Corporation until thereafter amended as
provided by law and such Certificate of Incorporation of the Surviving
Corporation; provided, however, that at the Effective Time the Certificate of
Incorporation of the Surviving Corporation shall be amended so that the name
of the Surviving Corporation shall be "ATL Products, Inc." The Certificate of
Incorporation of the Surviving Corporation shall conform to the requirements
set forth in Section 5.10.
 
  (b) The Bylaws of Merger Sub, as in effect immediately prior to the
Effective Time, shall be, at the Effective Time, the Bylaws of the Surviving
Corporation until thereafter amended. The Bylaws of the Surviving Corporation
shall conform to the requirements set forth in Section 5.10.
 
  1.5 Directors and Officers. The initial directors of the Surviving
Corporation shall be the directors of Merger Sub immediately prior to the
Effective Time, until their respective successors are duly elected or
appointed and qualified. The initial officers of the Surviving Corporation
shall be the officers of Merger Sub immediately prior to the Effective Time,
until their respective successors are duly appointed.
 
  1.6 Effect on Capital Stock. At the Effective Time, by virtue of the Merger
and without any action on the part of Merger Sub, Company or the holders of
any of the following securities:
 
    (a) Conversion of Company Common Stock. Each share of Class A Common
  Stock, $0.0001 par value per share, of Company (the "Company Class A
  Stock") and Class B Common Stock, $0.0001 par value per share, of Company
  (the "Company Class B Stock" and collectively with the Company Class A
  Stock, the "Company Common Stock") (including, with respect to each such
  share of Company Common Stock, the associated Rights (as defined in that
  certain Rights Agreement (the "Company Rights Plan") dated as of March 11,
  1998, between Company and BankBoston, N.A., as Rights Agent) issued and
  outstanding immediately prior to the Effective Time, other than any shares
  of Company Common Stock to be canceled pursuant to Section 1.6(b), will be
  canceled and extinguished and automatically converted (subject to Sections
  1.6(e) and (f)) into the right to receive that number of shares of Common
  Stock of Parent (the "Parent Common Stock") equal to the quotient
  determined by dividing (i) $29.00 by (ii) the Parent Deemed Value (as
  defined below) (the "Exchange Ratio") upon surrender of the certificate
  representing such share of Company Common Stock in the manner provided in
  Section 1.7 (or in the case of a lost, stolen or destroyed certificate,
  upon delivery of an affidavit (and bond, if required) in the manner
  provided in Section 1.9). For purposes of this Agreement, "Parent Deemed
  Value" shall mean the average closing price of Parent Common Stock as
  reported on the Nasdaq National Market System ("Nasdaq") for the period
  consisting of the 45 trading days ending on and including the fourth
  trading day prior to the date of the Company Stockholders' Meeting (as
  defined in Section 2.17) at which the Merger is approved (such 45-day
  period to be referred to hereinafter as the "Pricing Period"); provided,
  however, that the Parent Deemed Value shall be subject to adjustment
  pursuant to Section 1.6(g) below.
 
    (b) Cancellation of Parent-Owned Stock. Each share of Company Common
  Stock held by Company or owned by Merger Sub, Parent or any direct or
  indirect wholly-owned subsidiary of Company or of Parent immediately prior
  to the Effective Time shall be canceled and extinguished without any
  conversion thereof.
 
    (c) Stock Options. At the Effective Time, all options to purchase Company
  Common Stock then outstanding under Company's 1996 Stock Incentive Plan and
  the Company's 1997 Stock Incentive Plan (collectively, the "Company Stock
  Option Plans") shall be assumed by Parent in accordance with Section 5.8
  hereof.
 
                                      A-2
<PAGE>
 
    (d) Capital Stock of Merger Sub. Each share of Common Stock, $0.0001 par
  value per share, of Merger Sub (the "Merger Sub Common Stock") issued and
  outstanding immediately prior to the Effective Time shall be converted into
  one validly issued, fully paid and nonassessable share of Common Stock,
  $0.0001 par value per share, of the Surviving Corporation. Each certificate
  evidencing ownership of shares of Merger Sub Common Stock shall evidence
  ownership of such shares of capital stock of the Surviving Corporation.
 
    (e) Adjustments to Exchange Ratio. The Exchange Ratio shall be adjusted
  to reflect appropriately the effect of any stock split, reverse stock
  split, stock dividend (including any dividend or distribution of securities
  convertible into Parent Common Stock or Company Common Stock),
  reorganization, recapitalization, reclassification or other like change
  with respect to Parent Common Stock or Company Common Stock occurring on or
  after the date hereof and prior to the Effective Time.
 
    (f) Fractional Shares. No fraction of a share of Parent Common Stock will
  be issued by virtue of the Merger, but in lieu thereof each holder of
  shares of Company Common Stock who would otherwise be entitled to a
  fraction of a share of Parent Common Stock (after aggregating all
  fractional shares of Parent Common Stock that otherwise would be received
  by such holder) shall receive from Parent an amount of cash (rounded to the
  nearest whole cent) equal to the product of (i) such fraction, multiplied
  by (ii) the Parent Deemed Value.
 
    (g) Adjustment to Parent Deemed Value. Subject to the provisions below,
  the Parent Deemed Value shall be reduced by an amount equal to 50% of the
  excess, if any, of the Interim Price over the Adjusted Base Price where,
  for purposes of such calculation, (i) the Interim Price shall be equal to
  the average closing price of Parent Common Stock as reported on Nasdaq for
  the five (5) trading days beginning upon the commencement of the Pricing
  Period (as defined in Section 1.6(a)) (the "Interim Period") and (ii) the
  Adjusted Base Price shall be equal to the average closing price of Parent
  Common Stock as reported on Nasdaq for the five (5) trading days ending on
  and including May 18, 1998 (such average closing price to be referred to
  hereinafter as the "Unadjusted Base Price", and such five-day period
  referred to hereinafter as the "Base Period") increased by the greater of
  (v) the percentage by which the average HDD Index (as defined below) for
  the Interim Period exceeds the average of the HDD Index for the Base Period
  or (w) the percentage by which the average of the Nasdaq Composite Index
  for the Interim Period exceeds the average of the Nasdaq Composite Index
  for the Base Period; provided, however, that notwithstanding the foregoing,
  no adjustment shall be made to the Parent Deemed Value (x) if the Adjusted
  Base Price is greater than or equal to the Interim Price, (y) if the
  Unadjusted Base Price is greater than or equal to the Parent Deemed Value
  (as calculated prior to any adjustment pursuant to this Section 1.6(g)) or
  (z) to the extent that any adjustment to the Parent Deemed Value pursuant
  to this Section 1.6(g) would cause such Parent Deemed Value to be lower
  than the Unadjusted Base Price. The "HDD Index" for any period shall equal
  the sum of the daily closing sale prices per share of Seagate Technology
  Inc. and Western Digital Corp.
 
  1.7 Surrender of Certificates.
 
  (a) Exchange Agent. Parent shall select a bank or trust company reasonably
acceptable to Company to act as the exchange agent (the "Exchange Agent") in
the Merger.
 
  (b) Parent to Provide Common Stock. Promptly after the Effective Time,
Parent shall make available to the Exchange Agent for exchange in accordance
with this Article I, the shares of Parent Common Stock issuable pursuant to
Section 1.6 in exchange for outstanding shares of Company Common Stock, and
cash in an amount sufficient for payment in lieu of fractional shares pursuant
to Section 1.6(f) and any dividends or distributions to which holders of
shares of Company Common Stock may be entitled pursuant to Section 1.7(d).
 
  (c) Exchange Procedures. Promptly after the Effective Time, Parent shall
cause the Exchange Agent to mail to each holder of record (as of the Effective
Time) of a certificate or certificates (the "Certificates"), which immediately
prior to the Effective Time represented outstanding shares of Company Common
Stock whose shares were converted into shares of Parent Common Stock pursuant
to Section 1.6, cash in lieu of any fractional
 
                                      A-3
<PAGE>
 
shares pursuant to Section 1.6(f) and any dividends or other distributions
pursuant to Section 1.7(d), (i) a letter of transmittal in customary form
(which shall specify that delivery shall be effected, and risk of loss and
title to the Certificates shall pass, only upon delivery of the Certificates
to the Exchange Agent and shall contain such other provisions as Parent may
reasonably specify) and (ii) instructions for use in effecting the surrender
of the Certificates in exchange for certificates representing shares of Parent
Common Stock, cash in lieu of any fractional shares pursuant to Section 1.6(f)
and any dividends or other distributions pursuant to Section 1.7(d). Upon
surrender of Certificates for cancellation to the Exchange Agent or to such
other agent or agents as may be appointed by Parent, together with such letter
of transmittal, duly completed and validly executed in accordance with the
instructions thereto, the holders of such Certificates shall be entitled to
receive in exchange therefor certificates representing the number of whole
shares of Parent Common Stock into which their shares of Company Common Stock
were converted at the Effective Time, payment in lieu of fractional shares
which such holders have the right to receive pursuant to Section 1.6(f) and
any dividends or distributions payable pursuant to Section 1.7(d), and the
Certificates so surrendered shall forthwith be canceled. Until so surrendered,
outstanding Certificates will be deemed from and after the Effective Time, for
all corporate purposes, subject to Section 1.7(d) as to the payment of
dividends, to evidence only the ownership of the number of full shares of
Parent Common Stock into which such shares of Company Common Stock shall have
been so converted and the right to receive an amount in cash in lieu of the
issuance of any fractional shares in accordance with Section 1.6(f) and any
dividends or distributions payable pursuant to Section 1.7(d).
 
  (d) Distributions With Respect to Unexchanged Shares. No dividends or other
distributions declared or made after the date of this Agreement with respect
to Parent Common Stock with a record date after the Effective Time will be
paid to the holders of any unsurrendered Certificates with respect to the
shares of Parent Common Stock represented thereby until the holders of record
of such Certificates shall surrender such Certificates. Subject to applicable
law, following surrender of any such Certificates, the Exchange Agent shall
deliver to the record holders thereof, without interest, certificates
representing whole shares of Parent Common Stock issued in exchange therefor
along with payment in lieu of fractional shares pursuant to Section 1.6(f)
hereof and the amount of any such dividends or other distributions with a
record date after the Effective Time payable with respect to such whole shares
of Parent Common Stock.
 
  (e) Transfers of Ownership. If certificates representing shares of Parent
Common Stock are to be issued in a name other than that in which the
Certificates surrendered in exchange therefor are registered, it will be a
condition of the issuance thereof that the Certificates so surrendered will be
properly endorsed and otherwise in proper form for transfer and that the
persons requesting such exchange will have paid to Parent or any agent
designated by it any transfer or other taxes required by reason of the
issuance of certificates representing shares of Parent Common Stock in any
name other than that of the registered holder of the Certificates surrendered,
or established to the satisfaction of Parent or any agent designated by it
that such tax has been paid or is not payable.
 
  (f) No Liability. Notwithstanding anything to the contrary in this Section
1.7, neither the Exchange Agent, Parent, the Surviving Corporation nor any
party hereto shall be liable to a holder of shares of Parent Common Stock or
Company Common Stock for any amount properly paid to a public official
pursuant to any applicable abandoned property, escheat or similar law.
 
  1.8 No Further Ownership Rights in Company Common Stock. All shares of
Parent Common Stock issued in accordance with the terms hereof (including any
cash paid in respect thereof pursuant to Section 1.6(f) and 1.7(d)) shall be
deemed to have been issued in full satisfaction of all rights pertaining to
such shares of Company Common Stock, and there shall be no further
registration of transfers on the records of the Surviving Corporation of
shares of Company Common Stock which were outstanding immediately prior to the
Effective Time. If, after the Effective Time, Certificates are presented to
the Surviving Corporation for any reason, they shall be canceled and exchanged
as provided in this Article I.
 
  1.9 Lost, Stolen or Destroyed Certificates. In the event that any
Certificates shall have been lost, stolen or destroyed, the Exchange Agent
shall issue in exchange for such lost, stolen or destroyed Certificates, upon
the making of an affidavit of that fact by the holder thereof, certificates
representing the shares of Parent Common
 
                                      A-4
<PAGE>
 
Stock into which the shares of Company Common Stock represented by such
Certificates were converted pursuant to Section 1.6, cash for fractional
shares, if any, as may be required pursuant to Section 1.6(f) and any
dividends or distributions payable pursuant to Section 1.7(d).
 
  1.10 Tax and Accounting Consequences.
 
  (a) It is intended by the parties hereto that the Merger shall constitute a
reorganization within the meaning of Section 368 of the Code. The parties
hereto adopt this Agreement as a "plan of reorganization" within the meaning
of Sections 1.368-2(g) and 1.368-3(a) of the United States Income Tax
Regulations.
 
  (b) It is intended by the parties hereto that the Merger shall be treated as
a purchase for accounting purposes.
 
  1.11 Taking of Necessary Action; Further Action. If, at any time after the
Effective Time, any further action is necessary or desirable to carry out the
purposes of this Agreement and to vest the Surviving Corporation with full
right, title and possession to all assets, property, rights, privileges,
powers and franchises of Company and Merger Sub, the officers and directors of
Company and Merger Sub will take all such lawful and necessary action. Parent
shall cause Merger Sub to perform all of its obligations relating to this
Agreement and the transactions contemplated thereby.
 
                                  ARTICLE II
 
                   REPRESENTATIONS AND WARRANTIES OF COMPANY
 
  Company represents and warrants to Parent and Merger Sub, subject to the
exceptions (i) specifically disclosed in writing in the disclosure letter and
(ii) referencing a specific representation supplied by Company to Parent (or,
in the case where no specific reference to a representation is made, where
such reference would be reasonably apparent from the context thereof), dated
as of the date hereof and certified by a duly authorized officer of Company
(the "Company Schedules"), as follows:
 
  2.1 Organization of Company.
 
  (a) Company and each of its subsidiaries (i) is a corporation or other legal
entity duly organized, validly existing and in good standing under the laws of
the jurisdiction in which it is organized; (ii) has the corporate or other
power and authority to own, lease and operate its assets and property and to
carry on its business as now being conducted; and (iii) except as would not be
material to Company, is duly qualified or licensed to do business in each
jurisdiction where the character of the properties owned, leased or operated
by it or the nature of its activities makes such qualification or licensing
necessary.
 
  (b) Company has delivered to Parent a true and complete list of all of
Company's subsidiaries as of the date of this Agreement, indicating the
jurisdiction of organization of each subsidiary and Company's equity interest
therein.
 
  (c) Company has delivered or made available to Parent a true and correct
copy of the Certificate of Incorporation and Bylaws of Company and similar
governing instruments of each of its subsidiaries, each as amended to date,
and each such instrument is in full force and effect. Neither Company nor any
of its subsidiaries is in violation of any of the provisions of its
Certificate of Incorporation or Bylaws or equivalent governing instruments.
 
  2.2 Company Capital Structure. The authorized capital stock of Company
consists of 45,000,000 shares of Class A Common Stock, $0.0001 par value per
share, of which there were 9,655,000 shares issued and outstanding as of May
18, 1998, and 5,000,000 shares of Class B Common Stock, $0.0001 par value per
share, of which no shares are issued or outstanding. All outstanding shares of
Company Common Stock are duly authorized, validly issued, fully paid and
nonassessable and are not subject to preemptive rights created by
 
                                      A-5
<PAGE>
 
statute, the Certificate of Incorporation or Bylaws of Company or any
agreement or document to which Company is a party or by which it is bound. As
of May 18, 1998, Company had reserved an aggregate of 879,000 shares of Class
A Common Stock and 200,000 shares of Class B Common Stock, net of exercises,
for issuance pursuant to the Company Stock Option Plans. As of May 18, 1998,
there were options outstanding to purchase an aggregate of 848,500 shares of
Class A Common Stock and 191,750 shares of Class B Common Stock pursuant to
the Company Stock Option Plans. All shares of Company Common Stock subject to
issuance as aforesaid, upon issuance on the terms and conditions specified in
the instruments pursuant to which they are issuable, would be duly authorized,
validly issued, fully paid and nonassessable. The Company Schedules list for
each person who held options to acquire shares of Company Common Stock as of
May 18, 1998, the name of the holder of such option, the exercise price of
such option, the number of shares as to which such option had vested at such
date, the vesting schedule for such option and whether the exercisability of
such option will be accelerated in any way by the transactions contemplated by
this Agreement, and indicates the extent of acceleration, if any.
 
  2.3 Obligations With Respect to Capital Stock. Except as set forth in
Section 2.2, there are no equity securities, partnership interests or similar
ownership interests of any class of Company equity security, or any securities
exchangeable or convertible into or exercisable for such equity securities,
partnership interests or similar ownership interests, issued, reserved for
issuance or outstanding. Except for securities Company owns free and clear of
all claims and encumbrances, directly or indirectly through one or more
subsidiaries, and except for shares of capital stock or other similar
ownership interests of certain subsidiaries of Company that are owned by
certain nominee equity holders as required by the applicable law of the
jurisdiction of organization of such subsidiaries, as of the date of this
Agreement, there are no equity securities, partnership interests or similar
ownership interests of any class of equity security of any subsidiary of
Company, or any security exchangeable or convertible into or exercisable for
such equity securities, partnership interests or similar ownership interests,
issued, reserved for issuance or outstanding. Except as set forth in Section
2.2, there are no subscriptions, options, warrants, equity securities,
partnership interests or similar ownership interests, calls, rights (including
preemptive rights), commitments or agreements of any character to which
Company or any of its subsidiaries is a party or by which it is bound
obligating Company or any of its subsidiaries to issue, deliver or sell, or
cause to be issued, delivered or sold, or repurchase, redeem or otherwise
acquire, or cause the repurchase, redemption or acquisition of, any shares of
capital stock, partnership interests or similar ownership interests of Company
or any of its subsidiaries or obligating Company or any of its subsidiaries to
grant, extend, accelerate the vesting of or enter into any such subscription,
option, warrant, equity security, call, right, commitment or agreement. As of
the date of this Agreement, except as contemplated by this Agreement, there
are no registration rights and there is no voting trust, proxy, rights plan,
antitakeover plan or other agreement or understanding to which Company is a
party or by which it is bound with respect to any equity security of any class
of Company or with respect to any equity security, partnership interest or
similar ownership interest of any class of any of its subsidiaries.
Stockholders of Company will not be entitled to dissenters' rights under
applicable state law in connection with the Merger.
 
  2.4 Authority.
 
  (a) Company and each subsidiary has all requisite corporate power and
authority to enter into this Agreement and to consummate the transactions
contemplated hereby and thereby. The execution and delivery of this Agreement
and the consummation of the transactions contemplated hereby have been duly
authorized by all necessary corporate action on the part of Company, subject
only to the approval and adoption of this Agreement and the approval of the
Merger by Company's stockholders and the filing of the Certificate of Merger
pursuant to Delaware Law. A vote of the holders of a majority of the
outstanding shares of the Company Class A Stock is sufficient for Company's
stockholders to approve and adopt this Agreement and approve the Merger. This
Agreement has been duly executed and delivered by Company and, assuming its
due authorization, execution and delivery by Parent and Merger Sub,
constitutes a valid and binding obligation of Company, enforceable against
Company in accordance with its terms, except as enforceability may be limited
by bankruptcy and other similar laws and general principles of equity. The
execution and delivery of this Agreement by Company do not, and the
performance of this Agreement by Company will not, (i) conflict with or
violate the Certificate of Incorporation or Bylaws of Company or the
equivalent organizational documents of any of its subsidiaries,
 
                                      A-6
<PAGE>
 
(ii) subject to obtaining the approval and adoption of this Agreement and the
approval of the Merger by Company's stockholders as contemplated in Section
5.2 and compliance with the requirements set forth in Section 2.4(b) below,
conflict with or violate any law, rule, regulation, order, judgment or decree
applicable to Company or any of its subsidiaries or by which Company or any of
its subsidiaries or any of their respective properties is bound or affected,
or (iii) result in any material breach of or constitute a material default (or
an event that with notice or lapse of time or both would become a material
default) under, or impair Company's rights or alter the rights or obligations
of any third party under, or give to others any rights of termination,
amendment, acceleration or cancellation of, or result in the creation of a
material lien or encumbrance on any of the material properties or assets of
Company or any of its subsidiaries pursuant to, any material note, bond,
mortgage, indenture, contract, agreement, lease, license, permit, franchise,
concession, or other instrument or obligation to which Company or any of its
subsidiaries is a party or by which Company or any of its subsidiaries or its
or any of their respective assets are bound or affected. The Company Schedules
list all consents, waivers and approvals under any of Company's or any of its
subsidiaries' agreements, contracts, licenses or leases required to be
obtained in connection with the consummation of the transactions contemplated
hereby, which, if individually or in the aggregate not obtained, would result
in a material loss of benefits to Company, Parent or the Surviving Corporation
as a result of the Merger.
 
  (b) No consent, approval, order or authorization of, or registration,
declaration or filing with any court, administrative agency or commission or
other governmental authority or instrumentality, foreign or domestic
("Governmental Entity"), is required to be obtained or made by Company in
connection with the execution and delivery of this Agreement or the
consummation of the Merger, except for (i) the filing of the Certificate of
Merger with the Secretary of State of the State of Delaware, (ii) the filing
of the Proxy Statement/Prospectus (as defined in Section 2.18) with the
Securities and Exchange Commission ("SEC") in accordance with the Securities
Exchange Act of 1934, as amended (the "Exchange Act"), (iii) such consents,
approvals, orders, authorizations, registrations, declarations and filings as
may be required under applicable federal, foreign and state securities (or
related) laws and the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as
amended (the "HSR Act"), and the securities or antitrust laws of any foreign
country, and (iv) such other consents, authorizations, filings, approvals and
registrations which if not obtained or made would not be material to Company
or Parent or have a material adverse effect on the ability of the parties
hereto to consummate the Merger.
 
  2.5 SEC Filings; Company Financial Statements.
 
  (a) Company has filed all forms, reports and documents required to be filed
by Company with the SEC since March 13, 1997 and has made available to Parent
such forms, reports and documents in the form filed with the SEC. All such
required forms, reports and documents (including those that Company may file
subsequent to the date hereof) are referred to herein as the "Company SEC
Reports." As of their respective dates, the Company SEC Reports (i) were
prepared in accordance with the requirements of the Securities Act of 1933, as
amended (the "Securities Act"), or the Exchange Act, as the case may be, and
the rules and regulations of the SEC thereunder applicable to such Company SEC
Reports and (ii) did not at the time they were filed (or if amended by a
filing prior to the date of this Agreement, then on the date of such filing)
contain any untrue statement of a material fact or omit to state a material
fact required to be stated therein or necessary in order to make the
statements therein, in the light of the circumstances under which they were
made, not misleading. None of Company's subsidiaries is required to file any
forms, reports or other documents with the SEC.
 
  (b) Each of the consolidated financial statements (including, in each case,
any related notes thereto) contained in the Company SEC Reports (the "Company
Financials"), including each Company SEC Reports filed after the date hereof
until the Closing, (i) complied as to form in all material respects with the
published rules and regulations of the SEC with respect thereto, (ii) was
prepared in accordance with United States generally accepted accounting
principles ("GAAP") applied on a consistent basis throughout the periods
involved (except as may be indicated in the notes thereto or, in the case of
unaudited interim financial statements, as may be permitted by the SEC on Form
10-Q under the Exchange Act) and (iii) fairly presented the consolidated
financial position of Company and its subsidiaries as at the respective dates
thereof and the consolidated results of Company's operations and cash flows
for the periods indicated, except that the unaudited
 
                                      A-7
<PAGE>
 
interim financial statements may not contain footnotes and were or are subject
to normal and recurring year-end adjustments. The balance sheet of Company
contained in Company SEC Reports as of December 31, 1997 is hereinafter
referred to as the "Company Balance Sheet." Except as disclosed in the Company
Financials, since the date of the Company Balance Sheet neither Company nor
any of its subsidiaries has any liabilities required under GAAP to be set
forth on a balance sheet (absolute, accrued, contingent or otherwise) which
are, individually or in the aggregate, material to the business, results of
operations or financial condition of Company and its subsidiaries taken as a
whole, except for liabilities incurred since the date of the Company Balance
Sheet in the ordinary course of business consistent with past practices.
 
  (c) Company has heretofore furnished to Parent a complete and correct copy
of any amendments or modifications, which have not yet been filed with the SEC
but which are required to be filed, to agreements, documents or other
instruments which previously had been filed by Company with the SEC pursuant
to the Securities Act or the Exchange Act.
 
  2.6 Absence of Certain Changes or Events. Since the date of the Company
Balance Sheet there has not been: (i) any Material Adverse Effect (as defined
in Section 8.3(c)) on Company, (ii) any declaration, setting aside or payment
of any dividend on, or other distribution (whether in cash, stock or property)
in respect of, any of Company's or any of its subsidiaries' capital stock, or
any purchase, redemption or other acquisition by Company of any of Company's
capital stock or any other securities of Company or its subsidiaries or any
options, warrants, calls or rights to acquire any such shares or other
securities except for repurchases from employees following their termination
pursuant to the terms of their pre-existing stock option or purchase
agreements, (iii) any split, combination or reclassification of any of
Company's or any of its subsidiaries' capital stock, (iv) any granting by
Company or any of its subsidiaries of any increase in compensation or fringe
benefits, except for normal increases of cash compensation in the ordinary
course of business consistent with past practice, or any payment by Company or
any of its subsidiaries of any bonus, except for bonuses made in the ordinary
course of business consistent with past practice, or any granting by Company
or any of its subsidiaries of any increase in severance or termination pay or
any entry by Company or any of its subsidiaries into any currently effective
employment, severance, termination or indemnification agreement or any
agreement the benefits of which are contingent or the terms of which are
materially altered upon the occurrence of a transaction involving Company of
the nature contemplated hereby, (v) entry by Company or any of its
subsidiaries into any licensing or other agreement with regard to the
acquisition or disposition of any material Intellectual Property (as defined
in Section 2.9) other than licenses in the ordinary course of business
consistent with past practice or any amendment or consent with respect to any
licensing agreement filed or required to be filed by Company with the SEC,
(vi) any material change by Company in its accounting methods, principles or
practices, except as required by concurrent changes in GAAP, or (vii) any
revaluation by Company of any of its assets, including, without limitation,
writing down the value of capitalized inventory or writing off notes or
accounts receivable other than in the ordinary course of business.
 
  2.7 Taxes.
 
  (a) Definition of Taxes. For the purposes of this Agreement, "Tax" or
"Taxes" refers to any and all federal, state, local and foreign taxes,
assessments and other governmental charges, duties, impositions and
liabilities relating to taxes, including taxes based upon or measured by gross
receipts, income, profits, sales, use and occupation, and value added, ad
valorem, transfer, franchise, withholding, payroll, recapture, employment,
excise and property taxes, together with all interest, penalties and additions
imposed with respect to such amounts and any obligations under any agreements
or arrangements with any other person with respect to such amounts and
including any liability for taxes of a predecessor entity.
 
  (b) Tax Returns and Audits.
 
  (i) Company and each of its subsidiaries have timely filed all federal,
state, local and foreign returns, estimates, information statements and
reports ("Returns") relating to Taxes required to be filed by Company and each
of its subsidiaries with any Tax authority, and all such returns are true and
correct in all material respects.
 
                                      A-8
<PAGE>
 
  (ii) Company and each of its subsidiaries as of the Effective Time will have
withheld with respect to its employees all federal and state income taxes,
Taxes pursuant to the Federal Insurance Contribution Act ("FICA"), Taxes
pursuant to the Federal Unemployment Tax Act ("FUTA") and other Taxes required
to be withheld.
 
  (iii) Neither Company nor any of its subsidiaries has been delinquent in the
payment of any Tax nor is there any Tax deficiency outstanding, proposed or
assessed against Company or any of its subsidiaries, nor has Company or any of
its subsidiaries executed any unexpired waiver of any statute of limitations
on or extending the period for the assessment or collection of any Tax.
 
  (iv) No audit or other examination of any Return of Company or any of its
subsidiaries by any Tax authority is presently in progress, nor has Company or
any of its subsidiaries been notified of any request for such an audit or
other examination.
 
  (v) No adjustment relating to any Returns filed by Company or any of its
subsidiaries has been proposed in writing formally or informally by any Tax
authority to Company or any of its subsidiaries or any representative thereof.
 
  (vi) Neither Company nor any of its subsidiaries has any liability for
unpaid Taxes which has not been accrued for or reserved on the Company Balance
Sheet, whether asserted or unasserted, contingent or otherwise, which is
material to Company, other than any liability for unpaid Taxes that may have
accrued since the date of the Company Balance Sheet in connection with the
operation of the business of Company and its subsidiaries in the ordinary
course.
 
  (vii) There is no contract, agreement, plan or arrangement to which Company
is a party as of the date of this Agreement, including but not limited to the
provisions of this Agreement, covering any employee or former employee of
Company or any of its subsidiaries that, individually or collectively, could
give rise to the payment of any amount that would not be deductible pursuant
to Sections 280G, 404 or 162(m) of the Code.
 
  (viii) Neither Company nor any of its subsidiaries has filed any consent
agreement under Section 341(f) of the Code or agreed to have Section 341(f)(2)
of the Code apply to any disposition of a subsection (f) asset (as defined in
Section 341(f)(4) of the Code) owned by Company.
 
  (ix) Except as set forth on the Company Schedules, neither Company nor any
of its subsidiaries is party to any tax-sharing, tax indemnity or tax
allocation agreement or arrangement and neither Company nor any of its
subsidiaries has any liability or obligation under any such tax-sharing, tax
indemnity or tax allocation agreement or arrangement. No liability (or any
reasonable claim of liability) shall arise under any tax sharing, tax
indemnity or tax allocation agreement or arrangement (including under any such
agreement or arrangement set forth on the Company Schedules) as a result of
the Merger.
 
  (x) Except as may be required as a result of the Merger, Company and its
subsidiaries have not been and will not be required to include any adjustment
in Taxable income for any Tax period (or portion thereof) pursuant to Section
481 or Section 263A of the Code or any comparable provision under state or
foreign Tax laws as a result of transactions, events or accounting methods
employed prior to the Closing.
 
  (xi) None of Company's or its subsidiaries' assets are tax exempt use
property within the meaning of Section 168(h) of the Code.
 
  (xii) The Company Schedules list (A) any foreign Tax holidays, (B) any
intercompany transfer pricing agreements, or other arrangements that have been
established by Company or any of its subsidiaries with any Tax authority and
(C) any expatriate programs or policies affecting Company or any of its
subsidiaries.
 
                                      A-9
<PAGE>
 
  2.8 Title to Properties; Absence of Liens and Encumbrances.
 
  (a) The Company Schedules list the real property interests owned by Company
as of the date of this Agreement. The Company Schedules list all real property
leases to which Company is a party as of the date of this Agreement and each
amendment thereto that is in effect as of the date of this Agreement. All such
current leases are in full force and effect, are valid and effective in
accordance with their respective terms, and there is not, under any of such
leases, any existing default or event of default (or event which with notice
or lapse of time, or both, would constitute a default) that would give rise to
a claim against the Company in an amount greater than $50,000.
 
  (b) Company has good and valid title to, or, in the case of leased
properties and assets, valid leasehold interests in, all of its tangible
properties and assets, real, personal and mixed, used or held for use in its
business, free and clear of any liens, pledges, charges, claims, security
interests or other encumbrances of any sort ("Liens"), except as reflected in
the Company Financials and except for liens for taxes not yet due and payable
and such Liens or other imperfections of title and encumbrances, if any, which
are not material in character, amount or extent, and which do not materially
detract from the value, or materially interfere with the present use, of the
property subject thereto or affected thereby.
 
  2.9 Intellectual Property. For the purposes of this Agreement, the following
terms have the following definitions:
 
    "Intellectual Property" shall mean any or all of the following and all
  rights in, arising out of, or associated therewith: (i) all United States,
  international and foreign patents and applications therefor and all
  reissues, divisions, renewals, extensions, provisionals, continuations and
  continuations-in-part thereof; (ii) all inventions (whether patentable or
  not), invention disclosures, improvements, trade secrets, proprietary
  information, know how, technology, technical data and customer lists, and
  all documentation relating to any of the foregoing; (iii) all copyrights,
  copyrights registrations and applications therefor, and all other rights
  corresponding thereto throughout the world; (iv) all industrial designs and
  any registrations and applications therefor throughout the world; (v) all
  trade names, logos, common law trademarks and service marks, trademark and
  service mark registrations and applications therefor throughout the world;
  (vi) all databases and data collections and all rights therein throughout
  the world; (vii) all moral and economic rights of authors and inventors,
  however denominated, throughout the world, and (viii) any similar or
  equivalent rights to any of the foregoing anywhere in the world.
 
    "Company Intellectual Property" shall mean any Intellectual Property that
  is owned by, or exclusively licensed to, Company.
 
    "Registered Intellectual Property" means all United States, international
  and foreign: (i) patents and patent applications (including provisional
  applications); (ii) registered trademarks, applications to register
  trademarks, intent-to-use applications, or other registrations or
  applications related to trademarks; (iii) registered copyrights and
  applications for copyright registration; and (iv) any other Intellectual
  Property that is the subject of an application, certificate, filing,
  registration or other document issued, filed with, or recorded by any
  state, government or other public legal authority.
 
    "Company Registered Intellectual Property" means all of the Registered
  Intellectual Property owned by, or filed in the name of, Company.
 
  (a) No material Company Intellectual Property or product or service of
Company is subject to any proceeding or outstanding decree, order, judgment,
agreement, or stipulation restricting in any manner the use, transfer, or
licensing thereof by Company, or which may affect the validity, use or
enforceability of such Company Intellectual Property.
 
  (b) Each material item of Company Registered Intellectual Property is valid
and subsisting, all necessary registration, maintenance and renewal fees
currently due in connection with such Company Registered Intellectual Property
have been paid and all necessary documents, recordations and certificates in
connection with
 
                                     A-10
<PAGE>
 
such Company Registered Intellectual Property have been filed with the
relevant patent, copyright, trademark or other authorities in the United
States or foreign jurisdictions, as the case may be, for the purposes of
maintaining such Company Registered Intellectual Property.
 
  (c) Company owns and has good and exclusive title to, or has license
(sufficient for the conduct of its business as currently conducted and as
proposed by Company to be conducted) to, each material item of Company
Intellectual Property free and clear of any lien or encumbrance (excluding
licenses and related restrictions); and Company is the exclusive owner of all
trademarks and trade names used in connection with the operation or conduct of
the business of Company, including the sale of any products or the provision
of any services by Company.
 
  (d) Company owns exclusively, and has good title to, all copyrighted works
developed by Company or which Company otherwise expressly purports to own.
 
  (e) To the extent that any material Intellectual Property has been developed
or created by a third party for Company, Company has a written agreement with
such third party with respect thereto and Company thereby either (i) has
obtained ownership of, and is the exclusive owner of, or (ii) has obtained a
license (sufficient for the conduct of its business as currently conducted and
as proposed to be conducted) to all such third party's Intellectual Property
in such work, material or invention by operation of law or by valid agreement,
to the fullest extent it is legally possible to do so.
 
  (f) Company has not transferred ownership of, or granted any exclusive
license with respect to, any Intellectual Property that is or was material
Company Intellectual Property, to any third party.
 
  (g) The Company Schedules list all material contracts, licenses and
agreements to which Company is a party (i) with respect to Company
Intellectual Property licensed or transferred to any third party (other than
end-user licenses in the ordinary course); or (ii) pursuant to which a third
party has licensed or transferred any material Intellectual Property to
Company.
 
  (h) All material contracts, licenses and agreements relating to the Company
Intellectual Property are in full force and effect. The consummation of the
transactions contemplated by this Agreement will neither violate nor result in
the breach, modification, cancellation, termination, or suspension of such
contracts, licenses and agreements. Company is in material compliance with,
and has not materially breached any term any of such contracts, licenses and
agreements and, to the knowledge of Company, all other parties to such
contracts, licenses and agreements are in compliance with, and have not
materially breached any term of, such contracts, licenses and agreements.
Following the Closing Date, the Surviving Corporation will be permitted to
exercise all of Company's rights under such contracts, licenses and agreements
to the same extent Company would have been able to had the transactions
contemplated by this Agreement not occurred and without the payment of any
additional amounts or consideration other than ongoing fees, royalties or
payments which Company would otherwise be required to pay.
 
  (i) The operation of the business of Company as such business currently is
conducted, including Company's design, development, manufacture, marketing and
sale of the products or services of Company (including with respect to
products currently under development) has not, does not and will not infringe
or misappropriate the Intellectual Property of any third party (provided that
with respect to patent rights, such representation is limited to Company's
knowledge) or, to its knowledge, constitute unfair competition or trade
practices under the laws of any jurisdiction.
 
  (j) Company has not received actual notice from any third party that the
operation of the business of Company or any act, product or service of
Company, infringes or misappropriates the Intellectual Property of any third
party or constitutes unfair competition or trade practices under the laws of
any jurisdiction.
 
  (k) To the knowledge of Company, no person has or is infringing or
misappropriating any Company Intellectual Property.
 
                                     A-11
<PAGE>
 
  (l) Company has taken reasonable steps to protect Company's rights in
Company's confidential information and trade secrets that it wishes to protect
or any trade secrets or confidential information of third parties provided to
Company, and, without limiting the foregoing, Company has and enforces a
policy requiring each employee and contractor to execute a proprietary
information/confidentiality agreement substantially in the form provided to
Parent and all current and former employees and contractors of Company have
executed such an agreement, except where the failure to do so is not
reasonably expected to be material to Company.
 
  2.10 Compliance; Permits; Restrictions.
 
  (a) Neither Company nor any of its subsidiaries is, in any material respect,
in conflict with, or in default or in violation of (i) any law, rule,
regulation, order, judgment or decree applicable to Company or any of its
subsidiaries or by which Company or any of its subsidiaries or any of their
respective properties is bound or affected, or (ii) any material note, bond,
mortgage, indenture, contract, agreement, lease, license, permit, franchise or
other instrument or obligation to which Company or any of its subsidiaries is
a party or by which Company or any of its subsidiaries or its or any of their
respective properties is bound or affected, except for conflicts, violations
and defaults that (individually or in the aggregate) would not cause Company
to lose any material benefit or incur any material liability. No investigation
or review by any Governmental Entity is pending or, to Company's knowledge,
has been threatened in a writing delivered to Company against Company or any
of its subsidiaries, nor, to Company's knowledge, has any Governmental Entity
indicated an intention to conduct an investigation of Company or any of its
subsidiaries. There is no material agreement, judgment, injunction, order or
decree binding upon Company or any of its subsidiaries which has or could
reasonably be expected to have the effect of prohibiting or materially
impairing any business practice of Company or any of its subsidiaries, any
acquisition of material property by Company or any of its subsidiaries or the
conduct of business by Company as currently conducted.
 
  (b) Company and its subsidiaries hold, to the extent legally required, all
permits, licenses, variances, exemptions, orders and approvals from
governmental authorities that are material to and required for the operation
of the business of Company as currently conducted (collectively, the "Company
Permits"). Company and its subsidiaries are in compliance in all material
respects with the terms of the Company Permits, except where the failure to be
in compliance with the terms of the Company Permits would not be material to
Company.
 
  2.11 Litigation. There are no claims, suits, actions or proceedings pending
or, to the knowledge of Company, threatened against, relating to or affecting
Company or any of its subsidiaries, before any court, governmental department,
commission, agency, instrumentality or authority, or any arbitrator that seeks
to restrain or enjoin the consummation of the transactions contemplated by
this Agreement or which could reasonably be expected, either singularly or in
the aggregate with all such claims, actions or proceedings, to have a material
effect. No Governmental Entity has at any time challenged or questioned in a
writing delivered to Company the legal right of Company to design,
manufacture, offer or sell any of its products in the present manner or style
thereof.
 
  Company has never been subject to an audit, compliance review, investigation
or like contract review by the GSA office of the Inspector General or other
Governmental Entity or agent thereof in connection with any government
contract (a "Government Audit"), to Company's knowledge no Government Audit is
threatened or reasonably anticipated, and in the event of such Government
Audit, to the knowledge of Company no basis exists for a finding of
noncompliance with any material provision of any government contract or a
refund of any amounts paid or owed by any Governmental Entity pursuant to such
government contract. For each item disclosed in the Company Schedules pursuant
to this Section 2.11 a true and complete copy of all correspondence and
documentation with respect thereto has been provided to Parent.
 
  2.12 Brokers' and Finders' Fees. Company has not incurred, nor will it
incur, directly or indirectly, any liability for brokerage or finders' fees or
agents' commissions or any similar charges in connection with this Agreement
or any transaction contemplated hereby.
 
                                     A-12
<PAGE>
 
  2.13 Employee Benefit Plans.
 
  (a) Definitions. With the exception of the definition of "Affiliate" set
forth in Section 2.13(a)(i) below (which definition shall apply only to this
Section 2.13), for purposes of this Agreement, the following terms shall have
the meanings set forth below:
 
    (i) "Affiliate" shall mean any other person or entity under common
  control with Company within the meaning of Section 414(b), (c), (m) or (o)
  of the Code and the regulations issued thereunder;
 
    (ii) "Company Employee Plan" shall mean any plan, program, policy,
  practice, contract, agreement or other arrangement providing for
  compensation, severance, termination pay, performance awards, stock or
  stock-related awards, fringe benefits or other employee benefits or
  remuneration of any kind, whether written or unwritten or otherwise, funded
  or unfunded, including without limitation, each "employee benefit plan,"
  within the meaning of Section 3(3) of ERISA which is or has been
  maintained, contributed to, or required to be contributed to, by Company or
  any Affiliate for the benefit of any Employee
 
    (iii) "COBRA" shall mean the Consolidated Omnibus Budget Reconciliation
  Act of 1985, as amended
 
    (iv) "DOL" shall mean the Department of Labor;
 
    (v) "Employee" shall mean any current, former, or retired employee,
  officer, or director of Company or any Affiliate;
 
    (vi) "Employee Agreement" shall mean each management, employment,
  severance, consulting, relocation, repatriation, expatriation, visas, work
  permit or similar agreement or contract between Company or any Affiliate
  and any Employee or consultant;
 
    (vii) "ERISA" shall mean the Employee Retirement Income Security Act of
  1974, as amended;
 
    (viii) "FMLA" shall mean the Family Medical Leave Act of 1993, as
  amended;
 
    (ix) "International Employee Plan" shall mean each Company Employee Plan
  that has been adopted or maintained by Company, whether informally or
  formally, for the benefit of Employees outside the United States;
 
    (x) "IRS" shall mean the Internal Revenue Service;
 
    (xi) "Multiemployer Plan" shall mean any "Pension Plan" (as defined
  below) which is a "multiemployer plan," as defined in Section 3(37) of
  ERISA;
 
    (xii) "PBGC" shall mean the Pension Benefit Guaranty Corporation; and
 
    (xiii) "Pension Plan" shall mean each Company Employee Plan which is an
  "employee pension benefit plan," within the meaning of Section 3(2) of
  ERISA.
 
  (b) Schedule. The Company Schedules contain an accurate and complete list of
each Company Employee Plan and each material Employee Agreement. Company does
not have any plan or commitment to establish any new Company Employee Plan, to
modify any Company Employee Plan or Employee Agreement (except to the extent
required by law or to conform any such Company Employee Plan or Employee
Agreement to the requirements of any applicable law, in each case as
previously disclosed to Parent in writing, or as required by this Agreement),
or to enter into any Company Employee Plan or material Employee Agreement, nor
does it have any intention or commitment to do any of the foregoing.
 
  (c) Documents. Company has provided to Parent: (i) correct and complete
copies of all documents embodying each Company Employee Plan and each Employee
Agreement including all amendments thereto and written interpretations
thereof; (ii) the most recent annual actuarial valuations, if any, prepared
for each Company Employee Plan; (iii) the three (3) most recent annual reports
(Form Series 5500 and all schedules and financial statements attached
thereto), if any, required under ERISA or the Code in connection with each
Company Employee Plan or related trust; (iv) if the Company Employee Plan is
funded, the most recent annual and
 
                                     A-13
<PAGE>
 
periodic accounting of Company Employee Plan assets; (v) the most recent
summary plan description together with the summary of material modifications
thereto, if any, required under ERISA with respect to each Company Employee
Plan; (vi) all IRS determination, opinion, notification and advisory letters,
and rulings relating to Company Employee Plans and copies of all applications
and correspondence to or from the IRS or the DOL with respect to any Company
Employee Plan; (vii) all material written agreements and contracts relating to
each Company Employee Plan, including, but not limited to, administrative
service agreements, group annuity contracts and group insurance contracts;
(viii) all communications material to any Employee or Employees relating to
any Company Employee Plan and any proposed Company Employee Plans, in each
case, relating to any amendments, terminations, establishments, increases or
decreases in benefits, acceleration of payments or vesting schedules or other
events which would result in any material liability to Company; (ix) all COBRA
forms and related notices; and (x) all registration statements and
prospectuses prepared in connection with each Company Employee Plan.
 
  (d) Employee Plan Compliance. (i) Company has performed in all material
respects all obligations required to be performed by it under, is not in
material default or violation of, and has no knowledge of any default or
violation by any other party to each Company Employee Plan, and each Company
Employee Plan has been established and maintained in all material respects in
accordance with its terms and in compliance with all applicable laws,
statutes, orders, rules and regulations, including but not limited to ERISA or
the Code; (ii) each Company Employee Plan intended to qualify under Section
401(a) of the Code and each trust intended to qualify under Section 501(a) of
the Code has either received a favorable determination letter from the IRS
with respect to each such Plan as to its qualified status under the Code,
including all amendments to the Code effected by the Tax Reform Act of 1986
and subsequent legislation, or has remaining a period of time under applicable
Treasury regulations or IRS pronouncements in which to apply for such a
determination letter and make any amendments necessary to obtain a favorable
determination; (iii) to the Company's knowledge (following reasonable
inquiry), no "prohibited transaction," within the meaning of Section 4975 of
the Code or Sections 406 and 407 of ERISA, and not otherwise exempt under
Section 408 of ERISA, has occurred with respect to any Company Employee Plan;
(iv) there are no actions, suits or claims pending, or, to the knowledge of
Company, threatened or reasonably anticipated (other than routine claims for
benefits) against any Company Employee Plan or against the assets of any
Company Employee Plan; (v) each Company Employee Plan can be amended,
terminated or otherwise discontinued after the Effective Time in accordance
with its terms, without liability to Parent, Company or any of its Affiliates
(other than legally required payments in connection with such termination or
amendment and ordinary administration expenses typically incurred in a
termination event); (vi) there are no audits, inquiries or proceedings pending
or, to the knowledge of Company or any Affiliates, threatened by the IRS or
DOL with respect to any Company Employee Plan; and (vii) to the Company's
knowledge (following reasonable inquiry), neither Company nor any Affiliate is
subject to any penalty or tax with respect to any Company Employee Plan under
Section 402(i) of ERISA or Sections 4975 through 4980 of the Code.
 
  (e) Pension Plans. Company does not now, nor has it ever, maintained,
established, sponsored, participated in, or contributed to, any Pension Plan
which is subject to Title IV of ERISA or Section 412 of the Code.
 
  (f) Multiemployer Plans. At no time has Company contributed to or been
requested to contribute to any Multiemployer Plan.
 
  (g) No Post-Employment Obligations. No Company Employee Plan provides, or
has any liability to provide, retiree life insurance, retiree health or other
retiree employee welfare benefits to any person for any reason, except as may
be required by COBRA or other applicable statute, and Company has never
represented, promised or contracted (whether in oral or written form) to any
Employee (either individually or to Employees as a group) or any other person
that such Employee(s) or other person would be provided with retiree life
insurance, retiree health or other retiree employee welfare benefit, except to
the extent required by statute.
 
  (h) Neither Company nor any Affiliate has, prior to the Effective Time, and
in any material respect, violated any of the health care continuation
requirements of COBRA, the requirements of FMLA or any similar provisions of
state law applicable to its Employees.
 
                                     A-14
<PAGE>
 
  (i) Effect of Transaction.
 
  (i) The execution of this Agreement and the consummation of the transactions
contemplated hereby will not (either alone or upon the occurrence of any
additional or subsequent events) constitute an event under any Company
Employee Plan, Employee Agreement, trust or loan that will or may result in
any payment (whether of severance pay or otherwise), acceleration, forgiveness
of indebtedness, vesting, distribution, increase in benefits or obligation to
fund benefits with respect to any Employee.
 
  (ii) No payment or benefit which will or may be made by Company or its
Affiliates with respect to any Employee as a result of the transactions
contemplated by this Agreement will be characterized as an "excess parachute
payment," within the meaning of Section 280G(b)(1) of the Code.
 
  (j) Employment Matters. Company: (i) is in compliance in all material
respects with all applicable foreign, federal, state and local laws, rules and
regulations respecting employment, employment practices, terms and conditions
of employment and wages and hours, in each case, with respect to Employees;
(ii) has withheld all amounts required by law or by agreement to be withheld
from the wages, salaries and other payments to Employees; (iii) is not liable
for any arrears of wages or any taxes or any penalty for failure to comply
with any of the foregoing; and (iv) is not liable for any material payment to
any trust or other fund or to any governmental or administrative authority,
with respect to unemployment compensation benefits, social security or other
benefits or obligations for Employees (other than routine payments to be made
in the normal course of business and consistent with past practice). There are
no pending or, to Company's knowledge, any threatened, claims or actions
against Company under any worker's compensation policy or long-term disability
policy. To Company's knowledge, no employee of Company has violated any
employment contract, nondisclosure agreement or noncompetition agreement by
which such employee is bound due to such employee being employed by Company
and disclosing to Company or using trade secrets or proprietary information of
any other person or entity.
 
  (k) Labor. No work stoppage or labor strike against Company is pending,
threatened or reasonably anticipated. Company does not know of any activities
or proceedings of any labor union to organize any Employees. There are no
actions, suits, claims, labor disputes or grievances pending, or, to the
knowledge of Company, threatened or reasonably anticipated relating to any
labor, safety or discrimination matters involving any Employee, including,
without limitation, charges of unfair labor practices or discrimination
complaints, which, if adversely determined, would, individually or in the
aggregate, result in any material liability to Company. Neither Company nor
any of its subsidiaries has engaged in any unfair labor practices within the
meaning of the National Labor Relations Act. Company is not presently, nor has
it been in the past, a party to, or bound by, any collective bargaining
agreement or union contract with respect to Employees and no collective
bargaining agreement is being negotiated by Company.
 
  (l) International Employee Plan. Each International Employee Plan has been
established, maintained and administered in material compliance with its terms
and conditions and with the requirements prescribed by any and all statutory
or regulatory laws that are applicable to such International Employee Plan.
Furthermore, no International Employee Plan has unfunded liabilities, that as
of the Effective Time, will not be offset by insurance or fully accrued.
Except as required by law, no condition exists that would prevent Company or
Parent from terminating or amending any International Employee Plan at any
time for any reason.
 
  2.14 Environmental Matters.
 
  (a) Hazardous Material. Except as would not result in material liability to
Company, no underground storage tanks and no amount of any substance that has
been designated by any Governmental Entity or by applicable federal, state or
local law to be radioactive, toxic, hazardous or otherwise a danger to health
or the environment, including, without limitation, PCBs, asbestos, petroleum,
urea-formaldehyde and all substances listed as hazardous substances pursuant
to the Comprehensive Environmental Response, Compensation, and Liability Act
of 1980, as amended, or defined as a hazardous waste pursuant to the United
States Resource Conservation and Recovery Act of 1976, as amended, and the
regulations promulgated pursuant to said laws, but
 
                                     A-15
<PAGE>
 
excluding office and janitorial supplies, (a "Hazardous Material") are
present, as a result of the actions of Company or any of its subsidiaries or
any affiliate of Company, or, to Company's knowledge, as a result of any
actions of any third party or otherwise, in, on or under any property,
including the land and the improvements, ground water and surface water
thereof, that Company or any of its subsidiaries has at any time owned,
operated, occupied or leased.
 
  (b) Hazardous Materials Activities. Except as would not result in a material
liability to Company (in any individual case or in the aggregate) (i) neither
Company nor any of its subsidiaries has transported, stored, used,
manufactured, disposed of, released or exposed its employees or others to
Hazardous Materials in violation of any law in effect on or before the Closing
Date, and (ii) neither Company nor any of its subsidiaries has disposed of,
transported, sold, used, released, exposed its employees or others to or
manufactured any product containing a Hazardous Material (collectively
"Hazardous Materials Activities") in violation of any rule, regulation, treaty
or statute promulgated by any Governmental Entity in effect prior to or as of
the date hereof to prohibit, regulate or control Hazardous Materials or any
Hazardous Material Activity.
 
  (c) Permits. Company and its subsidiaries currently hold all environmental
approvals, permits, licenses, clearances and consents (the "Company
Environmental Permits") necessary for the conduct of Company's and its
subsidiaries' Hazardous Material Activities and other businesses of Company
and its subsidiaries as such activities and businesses are currently being
conducted.
 
  (d) Environmental Liabilities. No action, proceeding, revocation proceeding,
amendment procedure, writ or injunction is pending, and to Company's
knowledge, no action, proceeding, revocation proceeding, amendment procedure,
writ or injunction has been threatened by any Governmental Entity against
Company or any of its subsidiaries in a writing delivered to Company
concerning any Company Environmental Permit, Hazardous Material or any
Hazardous Materials Activity of Company or any of its subsidiaries. Company is
not aware of any fact or circumstance which could involve Company or any of
its subsidiaries in any environmental litigation or impose upon Company any
material environmental liability.
 
  2.15 Agreements, Contracts and Commitments. Except as otherwise set forth in
the Company Schedules, neither Company nor any of its subsidiaries is a party
to or is bound by:
 
    (a) any employment or consulting agreement, contract or commitment with
  any officer or director or higher level employee or member of Company's
  Board of Directors, other than those that are terminable by Company or any
  of its subsidiaries on no more than thirty days' notice without liability
  or financial obligation, except to the extent general principles of
  wrongful termination law may limit Company's or any of its subsidiaries'
  ability to terminate employees at will;
 
    (b) any agreement or plan, including, without limitation, any stock
  option plan, stock appreciation right plan or stock purchase plan, any of
  the benefits of which will be increased, or the vesting of benefits of
  which will be accelerated, by the occurrence of any of the transactions
  contemplated by this Agreement or the value of any of the benefits of which
  will be calculated on the basis of any of the transactions contemplated by
  this Agreement;
 
    (c) any agreement of indemnification or any guaranty other than any
  agreement of indemnification entered into in connection with the sale or
  license of software products in the ordinary course of business;
 
    (d) any agreement, contract or commitment containing any covenant
  limiting in any respect the right of Company or any of its subsidiaries to
  engage in any line of business or to compete with any person or granting
  any exclusive distribution rights;
 
    (e) any agreement, contract or commitment currently in force relating to
  the disposition or acquisition by Company or any of its subsidiaries after
  the date of this Agreement of a material amount of assets not in the
  ordinary course of business or pursuant to which Company has any material
  ownership interest in any corporation, partnership, joint venture or other
  business enterprise other than Company's subsidiaries;
 
                                     A-16
<PAGE>
 
    (f) any joint marketing or development agreement currently in force under
  which Company or any of its subsidiaries have continuing material
  obligations to jointly market any product, technology or service and which
  may not be canceled without penalty upon notice of 90 days or less, or any
  material agreement pursuant to which Company or any of its subsidiaries
  have continuing material obligations to jointly develop any intellectual
  property that will not be owned, in whole or in part, by Company or any of
  its subsidiaries and which may not be canceled without penalty upon notice
  of 90 days or less;
 
    (g) any agreement, contract or commitment currently in force to provide
  source code to any third party for any product or technology that is
  material to Company and its subsidiaries taken as a whole; or
 
    (h) any agreement, contract or commitment currently in force to license
  any third party to manufacture or reproduce any Company product, service or
  technology except as a distributor in the normal course of business.
 
  Neither Company nor any of its subsidiaries, nor to Company's knowledge any
other party to a Company Contract (as defined below), is in breach, violation
or default under, and neither Company nor any of its subsidiaries has received
written notice that it has breached, violated or defaulted under, any of the
material terms or conditions of any of the agreements, contracts or
commitments to which Company or any of its subsidiaries is a party or by which
it is bound that are required to be disclosed in the Company Schedules
pursuant to clauses (a) through (h) above or pursuant to Section 2.9 hereof
(any such agreement, contract or commitment, a "Company Contract") in such a
manner as would permit any other party to cancel or terminate any such Company
Contract, or would permit any other party to seek material damages or other
remedies (for any or all of such breaches, violations or defaults, in the
aggregate).
 
  2.16 Change of Control Payments. The Company Schedules set forth each plan
or agreement pursuant to which any amounts may become payable (whether
currently or in the future) to current or former officers and directors of
Company as a result of or in connection with the Merger.
 
  2.17 Statements; Proxy Statement/Prospectus. The information supplied by
Company for inclusion in the Registration Statement (as defined in Section
3.3(b)) shall not at the time the Registration Statement is filed with the SEC
and at the time it becomes effective under the Securities Act contain any
untrue statement of a material fact or omit to state any material fact
required to be stated therein or necessary in order to make the statements
therein, in light of the circumstances under which they are made, not
misleading. The information supplied by Company for inclusion in the proxy
statement/prospectus to be sent to (a) the stockholders of Company in
connection with the meeting of Company's stockholders to consider the approval
and adoption of this Agreement and the approval of the Merger (the "Company
Stockholders' Meeting") (such proxy statement/prospectus as amended or
supplemented is referred to herein as the "Proxy Statement/Prospectus") shall
not, on the date the Proxy Statement/Prospectus is first mailed to Company's
stockholders or at the time of the Company Stockholders' Meeting, contain any
untrue statement of a material fact or omit to state any material fact
required to be stated therein or necessary in order to make the statements
therein, in light of the circumstances under which they are made, not false or
misleading; or omit to state any material fact necessary to correct any
statement in any earlier communication with respect to the solicitation of
proxies for the Company Stockholders' Meeting which has become false or
misleading. The Proxy Statement/Prospectus will comply as to form in all
material respects with the provisions of the Securities Act, the Exchange Act
and the rules and regulations thereunder. If at any time prior to the
Effective Time any event relating to Company or any of its affiliates,
officers or directors should be discovered by Company which is required to be
set forth in an amendment to the Registration Statement or a supplement to the
Proxy Statement/Prospectus, Company shall promptly inform Parent.
Notwithstanding the foregoing, Company makes no representation or warranty
with respect to any information supplied by Parent or Merger Sub which is
contained in any of the foregoing documents.
 
  2.18 Board Approval. The Board of Directors of Company has, as of the date
of this Agreement, determined (i) that the Merger is fair to, and in the best
interests of Company and its stockholders, and (ii) to recommend that the
stockholders of Company approve and adopt this Agreement and approve the
Merger.
 
                                     A-17
<PAGE>
 
  2.19 Fairness Opinion. Company's Board of Directors has received an opinion
from NationsBanc Montgomery Securities, Inc. dated as of the date hereof, to
the effect that as of the date hereof, the Exchange Ratio is fair to Company's
stockholders from a financial point of view and will deliver to Parent a
written copy of such opinion within five (5) business days following the date
hereof.
 
  2.20 Section 203 of the Delaware General Corporation Law Not Applicable;
Company Rights Plan. The Board of Directors of Company has taken all actions
so that (a) the restrictions contained in Section 203 of the Delaware General
Corporation Law applicable to a "business combination" (as defined in such
Section 203) will not apply to the execution, delivery or performance of this
Agreement or to the consummation of the Merger or the other transactions
contemplated by this Agreement and (b) the Company Rights Plan has been
amended to (i) render the Company Rights Plan inapplicable to the Merger and
the other transactions contemplated by this Agreement, (ii) ensure that (x)
none of Parent or its subsidiaries is an Acquiring Person (as defined in the
Company Rights Plan) pursuant to the Company Rights Plan by virtue of the
execution of this Agreement or the consummation of the Merger or the other
transactions contemplated hereby and (y) a Distribution Date (as such term is
defined in the Company Rights Plan) does not occur by reason of the execution
of this Agreement, the consummation of the Merger, or the consummation of the
transactions contemplated hereby, and such amendment may not be further
amended by Company without the prior consent of Parent in its sole discretion.
 
  2.21 Customs. Company has acted with reasonable care to properly value and
classify, in accordance with applicable tariff laws, rules and regulations,
all goods that Company or any of its subsidiaries import into the United
States or into any other country (the "Imported Goods"). To Company's
knowledge, there are currently no material claims pending against Company by
the U.S. Customs Service (or other foreign customs authorities) relating to
the valuation, classification or marking of the Imported Goods.
 
 
                                  ARTICLE III
 
            REPRESENTATIONS AND WARRANTIES OF PARENT AND MERGER SUB
 
  Parent and Merger Sub represent and warrant to Company, subject to the
exceptions (i) specifically disclosed in writing in the disclosure letter and
(ii) referencing a specific representation supplied by Parent to Company (or,
in the case where no specific reference to a representation is made, where
such reference would be reasonably apparent from the context thereof), dated
as of the date hereof and certified by a duly authorized officer of Parent
(the "Parent Schedules"), as follows:
 
  3.1 Organization of Parent and Merger Sub.
 
  (a) Each of Parent and Merger Sub (i) is a corporation duly organized,
validly existing and in good standing under the laws of the jurisdiction in
which it is organized; (ii) has the corporate or other power and authority to
own, lease and operate its assets and property and to carry on its business as
now being conducted; and (iii), except as would not be material to Parent, is
duly qualified or licensed to do business in each jurisdiction where the
character of the properties owned, leased or operated by it or the nature of
its activities makes such qualification or licensing necessary.
 
  (b) Parent has delivered or made available to Company a true and correct
copy of the Certificate of Incorporation and Bylaws of Parent, each as amended
to date, and each such instrument is in full force and effect. Neither Parent
nor any of its subsidiaries is in violation of any of the provisions of its
Certificate of Incorporation or Bylaws or equivalent governing instruments.
 
  3.2 Parent and Merger Sub Capital Structure. The authorized capital stock of
Parent consists of 500,000,000 shares of Common Stock, of which there were
136,452,870 shares issued and outstanding as of December 28, 1997, and
4,000,000 shares of Preferred Stock, none of which are outstanding. All
outstanding shares of Parent Common Stock are duly authorized, validly issued,
fully paid and nonassessable and are not
 
                                     A-18
<PAGE>
 
subject to preemptive rights created by statute, the Certificate of
Incorporation or Bylaws of Parent or any agreement or document to which Parent
is a party or by which it is bound. The authorized capital stock of Merger Sub
consists of 100 shares of Common Stock, $0.0001 par value, all of which, as of
the date hereof, are issued and outstanding and are held by Parent. Merger Sub
was formed on or about May 18, 1998, for the purpose of consummating the
Merger and has no material assets or liabilities except as necessary for such
purpose.
 
  3.3 Authority.
 
  (a) Each of Parent and Merger Sub has all requisite corporate power and
authority to enter into, as applicable, this Agreement and to consummate the
transactions contemplated hereby and thereby. The execution and delivery of
this Agreement and the consummation of the transactions contemplated hereby
and thereby have been duly authorized by all necessary corporate action on the
part of Parent and Merger Sub, subject only to the filing of the Certificate
of Merger pursuant to Delaware Law. This Agreement has been duly executed and
delivered by each of Parent and Merger Sub and, assuming the due
authorization, execution and delivery by Company, constitutes the valid and
binding obligation of Parent and Merger Sub, enforceable against Parent and
Merger Sub in accordance with its terms, except as enforceability may be
limited by bankruptcy and other similar laws and general principles of equity.
The execution and delivery of this Agreement by each of Parent and Merger Sub
does not, and the performance of this Agreement by each of Parent and Merger
Sub will not, (i) conflict with or violate the Certificate of Incorporation or
Bylaws of Parent or Merger Sub, (ii) conflict with or violate any law, rule,
regulation, order, judgment or decree applicable to Parent or Merger Sub or by
which any of their respective properties is bound or affected or (iii) result
in any material breach of or constitute a material default (or an event that
with notice or lapse of time or both would become a material default) under,
or impair Parent's rights or alter the rights or obligations of any third
party under, or give to others any rights of termination, amendment,
acceleration or cancellation of, or result in the creation of a material lien
or encumbrance on any of the material properties or assets of Parent or Merger
Sub pursuant to, any material note, bond, mortgage, indenture, contract,
agreement, lease, license, permit, franchise or other instrument or obligation
to which Parent or Merger Sub is a party or by which Parent or Merger Sub or
any of their respective properties are bound or affected.
 
  (b) No consent, approval, order or authorization of, or registration,
declaration or filing with any Governmental Entity is required to be obtained
or made by Parent or Merger Sub in connection with the execution and delivery
of this Agreement or the consummation of the Merger, except for (i) the filing
of a Form S-4 (or any similar successor form thereto) Registration Statement
(the "Registration Statement") with the SEC in accordance with the Securities
Act, (ii) the filing of the Certificate of Merger with the Secretary of State
of the State of Delaware, (iii) such consents, approvals, orders,
authorizations, registrations, declarations and filings as may be required
under applicable federal, foreign and state securities (or related) laws and
the HSR Act and the securities or antitrust laws of any foreign country, and
(iv) such other consents, authorizations, filings, approvals and registrations
which if not obtained or made would not be material to Parent or Company or
have a material adverse effect on the ability of the parties hereto to
consummate the Merger.
 
  3.4 SEC Filings; Parent Financial Statements.
 
  (a) Parent has filed all forms, reports and documents required to be filed
by Parent with the SEC since March 31, 1997, and has made available to Company
such forms, reports and documents in the form filed with the SEC. All such
required forms, reports and documents (including those that Parent may file
subsequent to the date hereof) are referred to herein as the "Parent SEC
Reports." As of their respective dates, the Parent SEC Reports (i) were
prepared in accordance with the requirements of the Securities Act or the
Exchange Act, as the case may be, and the rules and regulations of the SEC
thereunder applicable to such Parent SEC Reports, and (ii) did not at the time
they were filed (or if amended or superseded by a filing prior to the date of
this Agreement, then on the date of such filing) contain any untrue statement
of a material fact or omit to state a material fact required to be stated
therein or necessary in order to make the statements therein, in the light of
the circumstances under which they were made, not misleading. None of Parent's
subsidiaries is required to file any forms, reports or other documents with
the SEC.
 
                                     A-19
<PAGE>
 
  (b) Each of the consolidated financial statements (including, in each case,
any related notes thereto) contained in the Parent SEC Reports (the "Parent
Financials"), including any Parent SEC Reports filed after the date hereof
until the Closing, (i) complied as to form in all material respects with the
published rules and regulations of the SEC with respect thereto, (ii) was
prepared in accordance with GAAP applied on a consistent basis throughout the
periods involved (except as may be indicated in the notes thereto or, in the
case of unaudited interim financial statements, as may be permitted by the SEC
on Form 10-Q under the Exchange Act) and (iii) fairly presented the
consolidated financial position of Parent and its subsidiaries as at the
respective dates thereof and the consolidated results of Parent's operations
and cash flows for the periods indicated, except that the unaudited interim
financial statements may not contain footnotes and were or are subject to
normal and recurring year-end adjustments. The balance sheet of Parent
contained in Parent SEC Reports as of December 31, 1997, is hereinafter
referred to as the "Parent Balance Sheet."
 
  3.5 Absence of Certain Changes or Events. Since the date of the Parent
Balance Sheet, there has not been (i) any Material Adverse Effect on Parent,
(ii) except as set forth in Section 3.5 of the Parent Schedules, any
declaration, setting aside or payment of any dividend on, or other
distribution (whether in cash, stock or property) in respect of, Parent's
capital stock, or any purchase, redemption or other acquisition by Parent of
Parent's capital stock or any other securities of Parent or any options,
warrants, calls or rights to acquire any such shares or other securities
except for repurchases from employees following their termination pursuant to
the terms of their pre-existing stock option or purchase agreements, (iii) any
material change by Parent in its accounting methods, principles or practices,
except as required by concurrent changes in GAAP, or (iv) any revaluation by
Parent of any of its assets, including, without limitation, writing down the
value of capitalized inventory or writing off notes or accounts receivable
other than in the ordinary course of business.
 
  3.6 Statements; Proxy Statement/Prospectus. The information supplied by
Parent for inclusion in the Registration Statement shall not at the time the
Registration Statement is filed with the SEC and at the time it becomes
effective under the Securities Act, contain any untrue statement of a material
fact or omit to state any material fact required to be stated therein or
necessary in order to make the statements therein, in light of the
circumstances under which they are made, not misleading. The information
supplied by Parent for inclusion in the Proxy Statement/Prospectus shall not,
on the date the Proxy Statement/Prospectus is first mailed to Company's
stockholders or at the time of the Company Stockholders' Meeting contain any
untrue statement of a material fact or omit to state any material fact
required to be stated therein or necessary in order to make the statements
therein, in light of the circumstances under which they are made, not false or
misleading; or omit to state any material fact necessary to correct any
statement in any earlier communication with respect to the solicitation of
proxies for the Company Stockholders' Meeting which has become false or
misleading. If at any time prior to the Effective Time, any event relating to
Parent or any of its affiliates, officers or directors should be discovered by
Parent which is required to be set forth in an amendment to the Registration
Statement or a supplement to the Proxy Statement/Prospectus, Parent shall
promptly inform Company. Notwithstanding the foregoing, Parent makes no
representation or warranty with respect to any information supplied by Company
which is contained in any of the foregoing documents.
 
  3.7 Litigation. Except as disclosed in the Parent SEC Reports, there are no
claims, suits, actions or proceedings pending or, to the knowledge of Parent,
threatened against, relating to or affecting Parent or any of its
subsidiaries, before any court, governmental department, commission, agency,
instrumentality or authority, or any arbitrator that seeks to restrain or
enjoin the consummation of the transactions contemplated by this Agreement or
which could reasonably be expected, either singularly or in the aggregate with
all such claims, action or proceedings, to have a material effect. No
Governmental Entity has at any time challenged or questioned in a writing
delivered to Parent the legal right of Parent to design, manufacture, offer or
sell any of its products in the present manner or style thereof.
 
                                     A-20
<PAGE>
 
                                  ARTICLE IV
 
                      CONDUCT PRIOR TO THE EFFECTIVE TIME
 
  4.1 Conduct of Business by Company. During the period from the date of this
Agreement and continuing until the earlier of the termination of this
Agreement pursuant to its terms or the Effective Time, Company and each of its
subsidiaries shall, except to the extent that Parent shall otherwise consent
in writing, carry on its business, in all material respects, in the ordinary
course, in substantially the same manner as heretofore conducted and in
compliance with all applicable laws and regulations, pay its debts and taxes
when due subject to good faith disputes over such debts or taxes, pay or
perform other material obligations when due, and use its commercially
reasonable efforts consistent with past practices and policies to (i) preserve
intact its present business organization, (ii) keep available the services of
its present officers and employees and (iii) preserve its relationships with
customers, suppliers, distributors, licensors, licensees, and others with
which it has business dealings. In addition, Company will promptly notify
Parent of any material event involving its business or operations.
 
  In addition, except as permitted by the terms of this Agreement, and except
as provided in Article 4 of the Company Schedules, without the prior written
consent of Parent, during the period from the date of this Agreement and
continuing until the earlier of the termination of this Agreement pursuant to
its terms or the Effective Time, Company shall not do any of the following and
shall not permit its subsidiaries to do any of the following:
 
    (a) Waive any stock repurchase rights, accelerate, amend or change the
  period of exercisability of options or restricted stock, or reprice options
  granted under any employee, consultant, director or other stock plans or
  authorize cash payments in exchange for any options granted under any of
  such plans;
 
    (b) Grant any severance or termination pay to any officer or employee
  except pursuant to written agreements outstanding, or policies existing, on
  the date hereof and as previously disclosed in writing or made available to
  Parent, or adopt any new severance plan;
 
    (c) Transfer or license to any person or entity or otherwise extend,
  amend or modify in any material respect any rights to the Company
  Intellectual Property, or enter into grants to future patent rights, other
  than non-exclusive licenses in the ordinary course of business and
  consistent with past practice;
 
    (d) Declare, set aside or pay any dividends on or make any other
  distributions (whether in cash, stock, equity securities or property) in
  respect of any capital stock or split, combine or reclassify any capital
  stock or issue or authorize the issuance of any other securities in respect
  of, in lieu of or in substitution for any capital stock;
 
    (e) Purchase, redeem or otherwise acquire, directly or indirectly, any
  shares of capital stock of Company or its subsidiaries, except repurchases
  of unvested shares at cost in connection with the termination of the
  employment relationship with any employee pursuant to stock option or
  purchase agreements in effect on the date hereof;
 
    (f) Issue, deliver, sell, authorize, pledge or otherwise encumber or
  propose any of the foregoing of, any shares of capital stock or any
  securities convertible into shares of capital stock, or subscriptions,
  rights, warrants or options to acquire any shares of capital stock or any
  securities convertible into shares of capital stock, or enter into other
  agreements or commitments of any character obligating it to issue any such
  shares or convertible securities, other than the issuance delivery and/or
  sale of shares of Company Common Stock pursuant to the exercise of stock
  options therefor outstanding as of the date of this Agreement.
 
    (g) Cause, permit or propose any amendments to its Certificate of
  Incorporation, Bylaws or other charter documents (or similar governing
  instruments of any of its subsidiaries);
 
    (h) Acquire or agree to acquire by merging or consolidating with, or by
  purchasing any equity interest in or a portion of the assets of, or by any
  other manner, any business or any corporation, partnership, association or
  other business organization or division thereof, or otherwise acquire or
  agree to acquire any
 
                                     A-21
<PAGE>
 
  assets which are material, individually or in the aggregate, to the
  business of Company or enter into any material joint ventures, strategic
  partnerships or alliances;
 
    (i) Sell, lease, license, encumber or otherwise dispose of any properties
  or assets which are material, individually or in the aggregate, to the
  business of Company, except sales of inventory in the ordinary course of
  business consistent with past practice;
 
    (j) Incur any indebtedness for borrowed money or guarantee any such
  indebtedness of another person, issue or sell any debt securities or
  options, warrants, calls or other rights to acquire any debt securities of
  Company, enter into any "keep well" or other agreement to maintain any
  financial statement condition or enter into any arrangement having the
  economic effect of any of the foregoing other than (i) in connection with
  the financing of ordinary course trade payables consistent with past
  practice or (ii) pursuant to existing credit facilities in the ordinary
  course of business;
 
    (k) Adopt or amend any employee benefit plan or employee stock purchase
  or employee stock option plan, or enter into any employment contract or
  collective bargaining agreement (other than offer letters and letter
  agreements entered into in the ordinary course of business consistent with
  past practice with employees who are terminable "at will,"), pay any
  special bonus or special remuneration to any director or employee, or
  increase the salaries or wage rates or fringe benefits (including rights to
  severance or indemnification) of its directors, officers, employees or
  consultants other than in the ordinary course of business, consistent with
  past practice, or change in any material respect any management policies or
  procedures;
 
    (l) Make any payments outside of the ordinary course of business in
  excess of $50,000;
 
    (m) Except in the ordinary course of business, materially modify, amend
  or terminate any material contract or agreement to which Company or any
  subsidiary thereof is a party or waive, release or assign any material
  rights or claims thereunder;
 
    (n) Enter into any material contracts, agreements, or obligations
  relating to the distribution, sale, license or marketing by third parties
  of Company's products or products licensed by Company other than in the
  ordinary course of business consistent with past practice;
 
    (o) Materially revalue any of its assets or, except as required by GAAP,
  make any change in accounting methods, principles or practices;
 
    (p) Engage in any action that could reasonably be expected to cause the
  Merger to fail to qualify as a "reorganization" under Section 368(a) of the
  Code; or
 
    (q) Agree in writing or otherwise to take any of the actions described in
  Article 4 (a) through (p) above.
 
  4.2 Conduct of Business by Parent. During the period from the date of this
Agreement and continuing until the earlier of the termination of this
Agreement pursuant to its terms or the Effective Time, except as permitted by
the terms of this Agreement and except as provided in Article 4 of the Parent
Schedules, without the prior written consent of Company, during the period
from the date of this Agreement and continuing until the earlier of the
termination of this Agreement pursuant to its terms or the Effective Time,
Parent shall not do the following:
 
    (a) Declare, set aside or pay any dividends on or make any other
  distributions (whether in cash, stock, equity securities or property) in
  respect of any capital stock or split, combine or reclassify any capital
  stock or issue or authorize the issuance of any other securities in respect
  of, in lieu of or in substitution for any capital stock; provided, however,
  that Parent may effect repurchases of up to 14,000,000 shares of its Common
  Stock in accordance with Rule 10b-18 under the Exchange Act or pursuant to
  private transactions;
 
    (b) Purchase, redeem or otherwise acquire, directly or indirectly, any
  shares of capital stock of Parent or its subsidiaries, except repurchases
  of unvested shares at cost in connection with the termination of the
 
                                     A-22
<PAGE>
 
  employment relationship with any employee pursuant to stock option or
  purchase agreements in effect on the date hereof; provided, however, that
  Parent may effect repurchases of up to 14,000,000 shares of its Common
  Stock in accordance with Rule 10b-18 under the Exchange Act or pursuant to
  private transactions;
 
    (c) Acquire or agree to acquire by merging or consolidating with, or by
  purchasing any equity interest in or a portion of the assets of, or by any
  manner, any business or any corporation, partnership, association or other
  business organization or division thereof, or otherwise acquire or agree to
  acquire any assets which are material, individually or in the aggregate, to
  the business of Parent or enter into any material joint ventures, strategic
  partnerships or alliances; provided, however, that the foregoing
  restrictions shall only apply to the extent that the contemplated
  transaction could reasonably be expected to directly cause a delay of the
  consummation of the Merger;
 
    (d) Engage in any action that could reasonably be expected to cause the
  Merger to fail to qualify as a "reorganization" under Section 368(a) of the
  Code; or
 
    (e) Materially revalue any of its assets or, except as required by GAAP,
  make any change in accounting methods, principles or practices; provided,
  however, that the foregoing restrictions shall only apply to the extent
  that the contemplated transaction could reasonably be expected to directly
  cause a delay of the consummation of the Merger.
 
                                   ARTICLE V
 
                             ADDITIONAL AGREEMENTS
 
  5.1 Proxy Statement/Prospectus; Registration Statement; Other Filings; Board
Recommendations.
 
  (a) As promptly as practicable after the execution of this Agreement,
Company and Parent will prepare, and file with the SEC, the Proxy
Statement/Prospectus, and Parent will prepare and file with the SEC the
Registration Statement in which the Proxy Statement/Prospectus will be
included as a prospectus. Each of Company and Parent will respond to any
comments of the SEC, and will use its respective commercially reasonable
efforts to have the Registration Statement declared effective under the
Securities Act as promptly as practicable after such filing, and Company will
cause the Proxy Statement/Prospectus to be mailed to its stockholders at the
earliest practicable time after the Registration Statement is declared
effective by the SEC. As promptly as practicable after the date of this
Agreement, each of Company and Parent will prepare and file any other filings
required to be filed by it under the Exchange Act, the Securities Act or any
other Federal, foreign or Blue Sky or related laws relating to the Merger and
the transactions contemplated by this Agreement (the "Other Filings"). Each of
Company and Parent will notify the other promptly upon the receipt of any
comments from the SEC or its staff or any other government officials and of
any request by the SEC or its staff or any other government officials for
amendments or supplements to the Registration Statement, the Proxy
Statement/Prospectus or any Other Filing or for additional information and
will supply the other with copies of all correspondence between such party or
any of its representatives, on the one hand, and the SEC, or its staff or any
other government officials, on the other hand, with respect to the
Registration Statement, the Proxy Statement/Prospectus, the Merger or any
Other Filing. Each of Company and Parent will cause all documents that it is
responsible for filing with the SEC or other regulatory authorities under this
Section 5.1(a) to comply in all material respects with all applicable
requirements of law and the rules and regulations promulgated thereunder.
Whenever any event occurs which is required to be set forth in an amendment or
supplement to the Proxy Statement/Prospectus, the Registration Statement or
any Other Filing, Company or Parent, as the case may be, will promptly inform
the other of such occurrence and cooperate in filing with the SEC or its staff
or any other government officials, and/or mailing to stockholders of Company,
such amendment or supplement.
 
  (b) The Proxy Statement/Prospectus will include the recommendation of the
Board of Directors of Company in favor of adoption and approval of this
Agreement and approval of the Merger.
 
                                     A-23
<PAGE>
 
  5.2 Meeting of Company Stockholders.
 
  (a) Promptly after the date hereof, Company will take all action necessary
in accordance with the Delaware Law and its Certificate of Incorporation and
Bylaws to convene the Company Stockholders' Meeting to be held as promptly as
practicable, and in any event (to the extent permissible under applicable law)
within 40 days after the declaration of effectiveness of the Registration
Statement, for the purpose of voting upon this Agreement and the Merger or the
issuance of shares of Parent Common Stock pursuant to the Merger,
respectively. Company will use its commercially reasonable efforts to solicit
from its stockholders proxies in favor of the adoption and approval of this
Agreement and the approval of the Merger and will take all other action
necessary or advisable to secure the vote or consent of its stockholders
required by the rules of Nasdaq or Delaware Law to obtain such approvals.
Notwithstanding anything to the contrary contained in this Agreement, Company
may adjourn or postpone the Company Stockholders' Meeting to the extent
necessary to ensure that any necessary supplement or amendment to the
Prospectus/Proxy Statement is provided to Company's stockholders in advance of
a vote on the Merger and this Agreement or, if as of the time for which
Company Stockholders' Meeting is originally scheduled (as set forth in the
Prospectus/Proxy Statement) there are insufficient shares of Company Common
Stock represented (either in person or by proxy) to constitute a quorum
necessary to conduct the business of the Company's Stockholders' Meeting.
Company shall ensure that the Company Stockholders' Meeting is called,
noticed, convened, held and conducted, and subject to Section 5.2(c) that all
proxies solicited by Company in connection with the Company Stockholders'
Meeting are solicited, in compliance with the Delaware Law, its Certificate of
Incorporation and Bylaws, the rules of Nasdaq and all other applicable legal
requirements.
 
  (b) Subject to Section 5.2(c): (i) the Board of Directors of Company shall
recommend that Company's stockholders vote in favor of and adopt and approve
this Agreement and the Merger at the Company Stockholders' Meeting; (ii) the
Prospectus/Proxy Statement shall include a statement to the effect that the
Board of Directors of Company has recommended that Company's stockholders vote
in favor of and adopt and approve this Agreement and the Merger at the Company
Stockholders' Meeting; and (iii) neither the Board of Directors of Company nor
any committee thereof shall withdraw, amend or modify, or propose or resolve
to withdraw, amend or modify in a manner adverse to Parent, the recommendation
of the Board of Directors of Company that Company's stockholders vote in favor
of and adopt and approve this Agreement and the Merger.
 
  (c) Nothing in this Agreement shall prevent the Board of Directors of
Company from withholding, withdrawing, amending or modifying its
recommendation in favor of the Merger if (i) a Superior Proposal (as defined
below) is made to Company and is not withdrawn, (ii) neither Company nor any
of its representatives shall have violated any of the restrictions set forth
in Section 5.4, and (iii) the Board of Directors of Company or any committee
thereof concludes in good faith, after consultation with its outside counsel,
that, in light of such Superior Proposal, the withholding, withdrawal,
amendment or modification of such recommendation is required in order for the
Board of Directors of Company or any committee thereof to comply with its
fiduciary obligations to Company's stockholders under applicable law. For
purposes of this Agreement ("Superior Proposal") shall mean an unsolicited,
bona fide written offer made by a third party to consummate any of the
following transactions: (i) a merger, consolidation, business combination,
recapitalization, liquidation, dissolution or similar transaction involving
Company pursuant to which the stockholders of Company immediately preceding
such transaction hold less than 50% of the equity interest in the surviving or
resulting entity of such transaction; (ii) a sale or other disposition by
Company of assets (excluding inventory and used equipment sold in the ordinary
course of business) representing in excess of 50% of the fair market value of
Company's business immediately prior to such sale, or (iii) the acquisition by
any person or group (including by way of a tender offer or an exchange offer
or issuance by Company), directly or indirectly, of beneficial ownership or a
right to acquire beneficial ownership of shares representing in excess of 50%
of the voting power of the then outstanding shares of capital stock of
Company, on terms that the Board of Directors of Company determines, in its
reasonable judgment, after consultation with its financial advisor, to be more
favorable to the Company stockholders than the terms of the Merger; provided,
however, that any such offer shall not be deemed to be a "Superior Proposal"
if any financing required to consummate the transaction contemplated by such
offer is not committed and is not likely in the judgment of Company's Board of
Directors to be obtained by such third party on a timely basis.
 
 
                                     A-24
<PAGE>
 
  5.3 Confidentiality; Access to Information.
 
  (a) The parties acknowledge that Company and Parent have previously executed
a Mutual Confidentiality Agreement, dated as of November 21, 1997 (the
"Confidentiality Agreement"), which Confidentiality Agreement will continue in
full force and effect in accordance with its terms.
 
  (b) Access to Information. Company will afford Parent and its accountants,
counsel and other representatives reasonable access during normal business
hours to the properties, books, records and personnel of Company during the
period prior to the Effective Time to obtain all information concerning the
business, including the status of product development efforts, properties,
results of operations and personnel of Company, as Parent may reasonably
request. No information or knowledge obtained by Parent in any investigation
pursuant to this Section 5.3 will affect or be deemed to modify any
representation or warranty contained herein or the conditions to the
obligations of the parties to consummate the Merger.
 
  5.4 No Solicitation.
 
  (a) From and after the date of this Agreement until the earlier of the
Effective Time or termination of this Agreement pursuant to its terms, Company
and its subsidiaries will not, nor will they authorize or permit any of their
respective officers, directors, affiliates or employees or any investment
banker, attorney or other advisor or representative retained by any of them to
(i) solicit, initiate or encourage the making, submission or announcement of
any Acquisition Proposal (as hereinafter defined), (ii) participate in any
discussions or negotiations with, or disclose any non-public information
concerning Company or any of its subsidiaries to, or afford any access to the
properties, books or records of Company or any of its subsidiaries to, or
enter into any agreement or understanding with, any person, entity or group
(other than Parent and its affiliates, agents and representatives), in
connection with any Acquisition Proposal, (iii) engage in any discussions with
any person with respect to any Acquisition Proposal, except as to the
existence of these provisions, (iv) subject to Section 5.2(c), approve,
endorse or recommend any Acquisition Proposal or (v) enter into any letter of
intent or similar document or any contract agreement or commitment
contemplating or otherwise relating to any Acquisition Transaction (as defined
below); provided, however, that prior to the approval of this Agreement by the
required Company Stockholder Vote, this Section 5.4(a) shall not prohibit
Company from furnishing nonpublic information regarding Company and its
subsidiaries to, entering into a confidentiality agreement with or entering
into discussions with, any person or group in response to a Superior Proposal
submitted by such person or group (and not withdrawn) if (1) neither Company
nor any representative of Company and its subsidiaries shall have violated any
of the restrictions set forth in this Section 5.4, (2) the Board of Directors
of Company concludes in good faith, after consultation with its outside legal
counsel, that such action is required in order for the Board of Directors of
Company to comply with its fiduciary obligations to Company's stockholders
under applicable law, (3) prior to furnishing any such nonpublic information
to, or entering into discussions with, such person or group, Company gives
Parent written notice of the identity of such person or group and of Company's
intention to furnish nonpublic information to, or enter into discussions with,
such person or group and Company receives from such person or group an
executed confidentiality agreement containing terms, conditions and
limitations, substantially similar to those contained in the Confidentiality
Agreement, on the use and disclosure of all nonpublic written and oral
information furnished to such person or group by or on behalf of Company, and
(4) contemporaneously with furnishing any such nonpublic information to such
person or group, Company furnishes such nonpublic information to Parent (to
the extent such nonpublic information has not been previously furnished by
Company to Parent). Company and its subsidiaries will immediately cease any
and all existing activities, discussions or negotiations with any parties
conducted heretofore with respect to any Acquisition Proposal. Without
limiting the foregoing, it is understood that any violation of the
restrictions set forth in the preceding two sentences by any officer, director
or employee of Company or any of its subsidiaries or any investment banker,
attorney or other advisor or representative of Company or any of its
subsidiaries shall be deemed to be a willful breach of this Section 5.4 by
Company. In addition to the foregoing, Company shall provide Parent with at
least forty-eight (48) hours prior written notice of any meeting of Company's
Board of Directors at which Company's Board of Directors is reasonably
expected to recommend, approve or authorize a Superior Proposal and together
with such notice a copy of the then-current draft of the definitive
documentation relating to such Superior Proposal.
 
                                     A-25
<PAGE>
 
  For purposes of this Agreement, "Acquisition Proposal" shall mean any offer
or proposal (other than an offer or proposal by Parent) relating to any
Acquisition Transaction. For the purposes of this Agreement, "Acquisition
Transaction" shall mean any transaction or series of related transactions
other than the transactions contemplated by this Agreement involving: (i) any
merger, consolidation, sale of substantial assets or similar transactions
involving Company or any of its subsidiaries (other than sales of assets or
inventory in the ordinary course of business or as permitted under the terms
of this Agreement), (ii) sale by Company of any shares of capital stock of
Company (including without limitation by way of a tender offer or an exchange
offer) except as may be permitted pursuant to Article 4, (iii) the acquisition
by any person of beneficial ownership or a right to acquire beneficial
ownership of, or the formation of any "group" (as defined under Section 13(d)
of the Exchange Act and the rules and regulations thereunder) which
beneficially owns, or has the right to acquire beneficial ownership of, 10% or
more of the then outstanding shares of capital stock of Company (except for
acquisitions for passive investment purposes of not more than 15% of the then
outstanding shares of capital stock of Company only in circumstances where the
person or group qualifies for and files a Schedule 13G with respect thereto
and does not become obligated to file a Schedule 13D), (iv) any liquidation or
dissolution of Company, or (v) any public announcement of a proposal, plan or
intention to do any of the foregoing or any agreement to engage in any of the
foregoing.
 
  (b) In addition to the obligations of Company set forth in paragraph (a) of
this Section 5.4, Company as promptly as practicable shall advise Parent
orally and in writing of any request for non-public information which Company
reasonably believes would lead to an Acquisition Proposal or of any
Acquisition Proposal, or any inquiry with respect to or which Company
reasonably should believe would lead to any Acquisition Proposal, the material
terms and conditions of such request, Acquisition Proposal or inquiry, and the
identity of the person or group making any such request, Acquisition Proposal
or inquiry. Company will keep Parent informed in all material respects of all
material amendments or proposed amendments (including, without limitation, any
change in consideration) of any such request, Acquisition Proposal or inquiry.
 
  (c) Nothing contained in this Section 5.4 or elsewhere in this Agreement
shall prohibit Company from (i) taking and disclosing to its stockholders a
position contemplated by Rules 14d-9 and 14e-2(a) promulgated under the
Exchange Act or (ii) making any disclosure to Company's stockholders if, in
the good faith judgment of the Board of Directors of Company, after
consultation with its outside legal counsel, failure to so disclose would be
inconsistent with applicable laws.
 
  5.5 Public Disclosure. Parent and Company will consult with each other, and
to the extent practicable, agree, before issuing any press release or
otherwise making any public statement with respect to the Merger, this
Agreement or an Acquisition Proposal and will not issue any such press release
or make any such public statement prior to such consultation, except as may be
required by law or any listing agreement with a national securities exchange.
The parties have agreed to the text of the joint press release announcing the
signing of this Agreement.
 
  5.6 Reasonable Efforts; Notification.
 
  (a) Upon the terms and subject to the conditions set forth in this
Agreement, each of the parties agrees to use all reasonable efforts to take,
or cause to be taken, all actions, and to do, or cause to be done, and to
assist and cooperate with the other parties in doing, all things necessary,
proper or advisable to consummate and make effective, in the most expeditious
manner practicable, the Merger and the other transactions contemplated by this
Agreement, including using reasonable efforts to accomplish the following: (i)
the taking of all reasonable acts necessary to cause the conditions precedent
set forth in Article VI to be satisfied, (ii) the obtaining of all necessary
actions or nonactions, waivers, consents, approvals, orders and authorizations
from Governmental Entities and the making of all necessary registrations,
declarations and filings (including registrations, declarations and filings
with Governmental Entities, if any) and the taking of all reasonable steps as
may be necessary to avoid any suit, claim, action, investigation or proceeding
by any Governmental Entity, (iii) the obtaining of all necessary consents,
approvals or waivers from third parties, (iv) the defending of any suits,
claims, actions, investigations or proceedings, whether judicial or
administrative, challenging this Agreement or
 
                                     A-26
<PAGE>
 
the consummation of the transactions contemplated hereby, including seeking to
have any stay or temporary restraining order entered by any court or other
Governmental Entity vacated or reversed and (v) the execution or delivery of
any additional instruments necessary to consummate the transactions
contemplated by, and to fully carry out the purposes of, this Agreement. In
connection with and without limiting the foregoing, Company and its Board of
Directors shall, if any state takeover statute or similar statute or
regulation is or becomes applicable to the Merger, this Agreement or any of
the transactions contemplated by this Agreement, use all reasonable efforts to
ensure that the Merger and the other transactions contemplated by this
Agreement may be consummated as promptly as practicable on the terms
contemplated by this Agreement and otherwise to minimize the effect of such
statute or regulation on the Merger, this Agreement and the transactions
contemplated hereby. Notwithstanding anything herein to the contrary, nothing
in this Agreement shall be deemed to require Parent or Company or any
subsidiary or affiliate thereof to agree to any divestiture by itself or any
of its affiliates of shares of capital stock or of any business, assets or
property, or the imposition of any material limitation on the ability of any
of them to conduct their businesses or to own or exercise control of such
assets, properties and stock.
 
  (b) Company shall give prompt notice to Parent of any representation or
warranty made by it contained in this Agreement becoming untrue or inaccurate,
or any failure of Company to comply with or satisfy in any material respect
any covenant, condition or agreement to be complied with or satisfied by it
under this Agreement, in each case, such that the conditions set forth in
Section 6.3(a) or 6.3(b) would not be satisfied, provided, however, that no
such notification shall affect the representations, warranties, covenants or
agreements of the parties or the conditions to the obligations of the parties
under this Agreement.
 
  (c) Parent shall give prompt notice to Company of any representation or
warranty made by it or Merger Sub contained in this Agreement becoming untrue
or inaccurate, or any failure of Parent or Merger Sub to comply with or
satisfy in any material respect any covenant, condition or agreement to be
complied with or satisfied by it under this Agreement, in each case, such that
the conditions set forth in Section 6.2(a) or 6.2(b) would not be satisfied,
provided, however, that no such notification shall affect the representations,
warranties, covenants or agreements of the parties or the conditions to the
obligations of the parties under this Agreement.
 
  5.7 Third Party Consents. As soon as practicable following the date hereof,
Parent and Company will each use its commercially reasonable efforts to obtain
any consents, waivers and approvals under any of its or its subsidiaries'
respective agreements, contracts, licenses or leases required to be obtained
in connection with the consummation of the transactions contemplated hereby.
 
  5.8 Stock Options and Employee Benefits.
 
  (a) At the Effective Time, each outstanding option to purchase shares of
Company Common Stock (each a "Company Stock Option") under the Company Stock
Option Plans, whether or not exercisable, will be assumed by Parent.
Immediately following the Effective Time, each Person who is a holder of a
Company Stock Option assumed by Parent hereunder, other than those executive
officers of the Company specifically identified on Schedule 5.8, shall have
the vesting with respect to fifty percent (50%) of his/her unvested options
immediately accelerated (the "Accelerated Portion"); provided, however, that,
in consideration of such vesting acceleration, each such Company Stock Option
holder shall agree that the balance of his/her unvested Company Stock Options
which are assumed by Parent hereunder and which are not accelerated pursuant
to this Section 5.8(a) shall continue to vest at the same percentage vesting
rate set forth in such holder's original Company Stock Option agreement
(unless the change of control provisions, if any, contained in such holder's
original Company Stock Option agreement specifically provide otherwise).
Except as set forth in the preceding sentence or on Schedule 5.8, no
outstanding Company Stock Option will have been accelerated or have the right
to be accelerated as a result of the Merger and there shall be no other
agreements at the Effective Time providing for change-in-control, option
acceleration or other benefits as a result of the Merger. Each Company Stock
Option so assumed by Parent under this Agreement will continue to have, and be
subject to, the same terms and conditions set forth in the applicable Company
Stock Option Plans immediately prior to the Effective Time (including, without
limitation, any repurchase rights or vesting provisions), except that (i) each
Company Stock
 
                                     A-27
<PAGE>
 
Option will be exercisable (or will become exercisable in accordance with its
terms) for that number of whole shares of Parent Common Stock equal to the
product of the number of shares of Company Common Stock that were issuable
upon exercise of such Company Stock Option immediately prior to the Effective
Time multiplied by the Exchange Ratio, rounded down to the nearest whole
number of shares of Parent Common Stock and (ii) the per share exercise price
for the shares of Parent Common Stock issuable upon exercise of such assumed
Company Stock Option will be equal to the quotient determined by dividing the
exercise price per share of Company Common Stock at which such Company Stock
Option was exercisable immediately prior to the Effective Time by the Exchange
Ratio, rounded up to the nearest whole cent.
 
  (b) It is intended that Company Stock Options assumed by Parent shall
qualify following the Effective Time as incentive stock options as defined in
Section 422 of the Code to the extent Company Stock Options qualified as
incentive stock options immediately prior to the Effective Time and the
provisions of this Section 5.8 shall be applied consistent with such intent.
 
  (c) Parent intends to maintain or cause Company to maintain employee benefit
plans (as defined in Section 3(3) of ERISA) for the benefit of employees of
Company which are substantially similar to those benefits provided for
Parent's employees, including, without limitation, any of the following
benefit plans maintained by Parent: medical/dental/vision care, life
insurance, disability income, sick pay, holiday and vacation pay, 401(k) plan
coverage, Section 125 benefit arrangements, bonus profit-sharing or other
incentive plans, pension or retirement programs, dependent care assistance,
severance benefits, and employee stock option and stock purchase plans, to the
extent Company employees meet the eligibility requirements for each such plan
or program. Parent intends that Company's employees shall be given credit, for
purposes of any service requirements for participation, for their period of
service with Company and Odetics, Inc. prior to the Closing Date, and Company
employees shall also, with respect to any Parent plans or programs which have
co-payment, deductible or other co-insurance features, receive credit for any
amounts such employees have paid to date in 1998 in co-payments, deductibles
or co-insurance under comparable programs maintained by Company prior to the
date hereof. In addition, Parent intends that, to the maximum extent allowable
under the Company's medical/health plans, no Company employee who participates
in any medical/health plan of Company at the Closing Date shall be denied
coverage under Parent's medical/health plan by reason of any pre-existing
condition exclusions.
 
  (d) Within twenty (20) business days following the Effective Time, Parent
shall issue to each person who is a holder of a Company Stock Option assumed
by Parent hereunder a document, in form and substance reasonably satisfactory
to Company, evidencing such assumption. Pursuant to such document, the
agreements evidencing such assumed Company Stock Option shall be deemed to be
appropriately amended and adjusted so that such assumed Company Stock Option
shall represent the right to acquire Parent Common Stock on the same terms and
conditions as contained in the agreements evidencing such Company Stock Option
(subject to the adjustments required by this Section 5.8 to effect the
assumption by Parent as set forth above).
 
  5.9 Form S-8. Parent agrees to file a registration statement on Form S-8 for
the shares of Parent Common Stock issuable with respect to assumed Company
Stock Options as soon as is reasonably practicable after the Effective Time
and intends to maintain the effectiveness of such registration statement
thereafter for so long as any of such options or other rights remain
outstanding.
 
  5.10 Indemnification.
 
  (a) From and after the Effective Time, Parent will cause the Surviving
Corporation to fulfill and honor in all respects the obligations of Company
pursuant to any indemnification agreements between Company and its directors
and officers as of the Effective Time (the "Indemnified Parties") and any
indemnification provisions under Company's Certificate of Incorporation or
Bylaws as in effect on the date hereof. The Certificate of Incorporation and
Bylaws of the Surviving Corporation will contain provisions with respect to
exculpation and indemnification that are at least as favorable to the
Indemnified Parties as those contained in the Certificate of Incorporation and
Bylaws of Company as in effect on the date hereof, which provisions will not
be amended,
 
                                     A-28
<PAGE>
 
repealed or otherwise modified for a period of six years from the Effective
Time in any manner that would adversely affect the rights thereunder of
individuals who, immediately prior to the Effective Time, were directors,
officers, employees or agents of Company, unless such modification is required
by law.
 
  (b) From the Effective Time until the sixth anniversary thereof, the
Surviving Corporation shall maintain in effect, for the benefit of the current
directors and officers of the Company with respect to acts or omissions
occurring prior to the Effective Time, the existing policy of directors' and
officers' liability insurance maintained by the Company as of the date of this
Agreement (the "Existing Policy"); provided, however, that (i) the Surviving
Corporation may substitute for the Existing Policy a policy or policies of
comparable coverage, and (ii) the Surviving Corporation shall not be required
to pay an annual premium for the Existing Policy (or for any substitute
policies) in excess of 150% of the amount of the last annual premium paid by
the Company prior to the date of this Agreement for the Existing Policy (the
"Past Premium Amount"). In the event any future annual premium for the
Existing Policy (or any substitute policies) exceeds 150% of the Past Premium
Amount, the Surviving Corporation shall be entitled to reduce the amount of
coverage of the Existing Policy (or any substitute policies) to the amount of
coverage that can be obtained for a premium equal to 150% of the Past Premium
Amount.
 
  (c) This Section 5.10 shall survive the consummation of the Merger at the
Effective Time, is intended to be for the benefit of, and enforceable by, each
person entitled to indemnification pursuant hereto and each such person's or
entity's heirs and representatives, and shall be binding on all successors and
assigns of Parent and the Surviving Corporation.
 
  5.11 Nasdaq Listing. Parent agrees to authorize for listing on Nasdaq the
shares of Parent Common Stock issuable, and those required to be reserved for
issuance, in connection with the Merger, upon official notice of issuance.
 
  5.12 Company Affiliate Agreement. Set forth on the Company Schedules is a
list of those persons who may be deemed to be, in Company's reasonable
judgment, affiliates of Company within the meaning of Rule 145 promulgated
under the Securities Act (each a "Company Affiliate"). Company will provide
Parent with such information and documents as Parent reasonably requests for
purposes of reviewing such list. Company will use its best efforts to deliver
or cause to be delivered to Parent, as promptly as practicable on or following
the date hereof, from each Company Affiliate an executed affiliate agreement
in substantially the form attached hereto as Exhibit B (the "Company Affiliate
Agreement"), each of which will be in full force and effect as of the
Effective Time. Parent will be entitled to place appropriate legends on the
certificates evidencing any Parent Common Stock to be received by a Company
Affiliate pursuant to the terms of this Agreement, and to issue appropriate
stop transfer instructions to the transfer agent for the Parent Common Stock,
consistent with the terms of the Company Affiliate Agreement.
 
  5.13 Regulatory Filings; Reasonable Efforts. As soon as may be reasonably
practicable, Company and Parent each shall file with the United States Federal
Trade Commission (the "FTC") and the Antitrust Division of the United States
Department of Justice ("DOJ") Notification and Report Forms relating to the
transactions contemplated herein as required by the HSR Act, as well as
comparable pre-merger notification forms required by the merger notification
or control laws and regulations of any applicable jurisdiction, as agreed to
by the parties. Company and Parent each shall promptly (a) supply the other
with any information which may be required in order to effectuate such filings
and (b) supply any additional information which reasonably may be required by
the FTC, the DOJ or the competition or merger control authorities of any other
jurisdiction and which the parties may reasonably deem appropriate.
 
  5.14 Comfort Letter. If requested by Parent, Company shall use reasonable
efforts to cause Ernst & Young LLP, certified public accountants to Company,
to provide a letter reasonably acceptable to Parent, relating to their review
of the financial statements relating to Company contained in or incorporated
by reference in the Registration Statement.
 
                                     A-29
<PAGE>
 
                                  ARTICLE VI
 
                           CONDITIONS TO THE MERGER
 
  6.1 Conditions to Obligations of Each Party to Effect the Merger. The
respective obligations of each party to this Agreement to effect the Merger
shall be subject to the satisfaction at or prior to the Closing Date of the
following conditions:
 
    (a) Company Stockholder Approval. This Agreement shall have been approved
  and adopted, and the Merger shall have been duly approved, by the requisite
  vote under applicable law, by the stockholders of Company.
 
    (b) Registration Statement Effective; Proxy Statement. The SEC shall have
  declared the Registration Statement effective. No stop order suspending the
  effectiveness of the Registration Statement or any part thereof shall have
  been issued and no proceeding for that purpose, and no similar proceeding
  in respect of the Proxy Statement/Prospectus, shall have been initiated or
  threatened in writing by the SEC.
 
    (c) No Order; HSR Act. No Governmental Entity shall have enacted, issued,
  promulgated, enforced or entered any statute, rule, regulation, executive
  order, decree, injunction or other order (whether temporary, preliminary or
  permanent) which is in effect and which has the effect of making the Merger
  illegal or otherwise prohibiting consummation of the Merger. All waiting
  periods, if any, under the HSR Act relating to the transactions
  contemplated hereby will have expired or terminated early and all material
  foreign antitrust approvals required to be obtained prior to the Merger in
  connection with the transactions contemplated hereby shall have been
  obtained.
 
    (d) Tax Opinions. Parent and Company shall each have received written
  opinions from their respective tax counsel (Wilson Sonsini Goodrich &
  Rosati, Professional Corporation, and Brobeck, Phleger & Harrison LLP,
  respectively), in form and substance reasonably satisfactory to them, to
  the effect that the Merger will constitute a reorganization within the
  meaning of Section 368(a) of the Code and such opinions shall not have been
  withdrawn; provided, however, that if the counsel to either Parent or
  Company does not render such opinion, this condition shall nonetheless be
  deemed to be satisfied with respect to such party if counsel to the other
  party renders such opinion to such party. The parties to this Agreement
  agree to make such reasonable representations as requested by such counsel
  for the purpose of rendering such opinions.
 
    (e) Nasdaq Listing. The shares of Parent Common Stock issuable to
  stockholders of Company pursuant to this Agreement and such other shares
  required to be reserved for issuance in connection with the Merger shall
  have been authorized for listing on Nasdaq upon official notice of
  issuance.
 
  6.2 Additional Conditions to Obligations of Company. The obligation of
Company to consummate and effect the Merger shall be subject to the
satisfaction at or prior to the Closing Date of each of the following
conditions, any of which may be waived, in writing, exclusively by Company:
 
    (a) Representations and Warranties. Each representation and warranty of
  Parent and Merger Sub contained in this Agreement (i) shall have been true
  and correct as of the date of this Agreement and (ii) shall be true and
  correct on and as of the Closing Date with the same force and effect as if
  made on the Closing Date except, (A) in each case, or in the aggregate, as
  does not constitute a Material Adverse Effect on Parent and Merger Sub, (B)
  for changes contemplated by this Agreement and (C) for those
  representations and warranties which address matters only as of a
  particular date (which representations shall have been true and correct
  except as does not constitute a Material Adverse Effect on Parent and
  Merger Sub as of such particular date) (it being understood that, for
  purposes of determining the accuracy of such representations and
  warranties, (i) all "Material Adverse Effect" qualifications and other
  qualifications based on the word "material" or similar phrases contained in
  such representations and warranties shall be disregarded and (ii) any
  update of or modification to the Parent Schedules made or purported to have
  been made after the date of this Agreement shall be disregarded). Company
  shall have received a certificate with respect to the foregoing signed on
  behalf of Parent by an authorized officer of Parent.
 
                                     A-30
<PAGE>
 
    (b) Agreements and Covenants. Parent and Merger Sub shall have performed
  or complied in all material respects with all agreements and covenants
  required by this Agreement to be performed or complied with by them on or
  prior to the Closing Date, and Company shall have received a certificate to
  such effect signed on behalf of Parent by an authorized officer of Parent.
 
    (c) Material Adverse Effect. No Material Adverse Effect with respect to
  Parent shall have occurred since the date of this Agreement.
 
  6.3 Additional Conditions to the Obligations of Parent and Merger Sub. The
obligations of Parent and Merger Sub to consummate and effect the Merger shall
be subject to the satisfaction at or prior to the Closing Date of each of the
following conditions, any of which may be waived, in writing, exclusively by
Parent:
 
    (a) Representations and Warranties. Each representation and warranty of
  Company contained in this Agreement (i) shall have been true and correct as
  of the date of this Agreement and (ii) shall be true and correct on and as
  of the Closing Date with the same force and effect as if made on and as of
  the Closing Date except (A) in each case (other than the representations in
  Sections 2.2 and 2.3, which shall have been and which shall be true and
  correct in all material respects), or in the aggregate, as does not
  constitute a Material Adverse Effect on Company, (B) for changes
  contemplated by this Agreement and (C) for those representations and
  warranties (other than the representations in Sections 2.2 and 2.3) which
  address matters only as of a particular date (which representations shall
  have been true and correct except as does not constitute a Material Adverse
  Effect on Company as of such particular date) (it being understood that,
  for purposes of determining the accuracy of such representations and
  warranties, (i) all "Material Adverse Effect" qualifications and other
  qualifications based on the word "material" or similar phrases contained in
  such representations and warranties shall be disregarded and (ii) any
  update of or modification to the Company Schedules made or purported to
  have been made after the date of this Agreement shall be disregarded).
  Parent shall have received a certificate with respect to the foregoing
  signed on behalf of Company by an authorized officer of Company.
 
    (b) Agreements and Covenants. Company shall have performed or complied in
  all material respects with all agreements and covenants required by this
  Agreement to be performed or complied with by it at or prior to the Closing
  Date, and Parent shall have received a certificate to such effect signed on
  behalf of Company by the Chief Executive Officer and the Chief Financial
  Officer of Company.
 
    (c) Material Adverse Effect. No Material Adverse Effect with respect to
  Company and its subsidiaries shall have occurred since the date of this
  Agreement.
 
    (d) Noncompetition Agreements. The persons set forth on Exhibit C-1
  hereto shall have entered into Noncompetition Agreements substantially in
  the form attached hereto as Exhibit C-2 and such agreements shall be in
  full force and effect.
 
    (e) Consents. Company shall have obtained all consents, waivers and
  approvals required in connection with the consummation of the transactions
  contemplated hereby in connection with the agreements, contracts, licenses
  or leases set forth on Schedule 6.3(f).
 
    (f) Company Rights Plan. All actions necessary to extinguish and cancel
  all outstanding Rights under the Company Rights Plan or render such Rights
  inapplicable to the Merger shall have been taken.
 
                                     A-31
<PAGE>
 
                                  ARTICLE VII
 
                       TERMINATION, AMENDMENT AND WAIVER
 
  7.1 Termination. This Agreement may be terminated at any time prior to the
Effective Time, whether before or after the requisite approvals of the
stockholders of Company or Parent:
 
    (a) by mutual written consent duly authorized by the Boards of Directors
  of Parent and Company;
 
    (b) by either Company or Parent if the Merger shall not have been
  consummated by November 18, 1998 for any reason; provided, however, that
  the right to terminate this Agreement under this Section 7.1(b) shall not
  be available to any party whose action or failure to act has been a
  principal cause of or resulted in the failure of the Merger to occur on or
  before such date and such action or failure to act constitutes a breach of
  any covenant set forth in this Agreement;
 
    (c) by either Company or Parent if a Governmental Entity shall have
  issued an order, decree or ruling or taken any other action, in any case
  having the effect of permanently restraining, enjoining or otherwise
  prohibiting the Merger, which order, decree, ruling or other action is
  final and nonappealable;
 
    (d) by either Company or Parent if the required approval of the
  stockholders of Company contemplated by this Agreement shall not have been
  obtained by reason of the failure to obtain the required vote at a meeting
  of Company stockholders duly convened therefor or at any adjournment
  thereof (provided that the right to terminate this Agreement under this
  Section 7.1(d) shall not be available to Company where the failure to
  obtain Company stockholder approval shall have been caused by the action or
  failure to act of Company and such action or failure to act constitutes a
  breach by Company of any covenant set forth in this Agreement);
 
    (e) by Company (at any time prior to the adoption and approval of this
  Agreement and the Merger by the required vote of the stockholders of
  Company) if a Company Triggering Event (as defined below) shall have
  occurred. For the purposes of this Agreement, a "Company Triggering Event"
  shall be deemed to have occurred if the Board of Directors of Company or
  any committee thereof shall have approved or publicly recommended any
  Superior Proposal.
 
    (f) by Parent if a Parent Triggering Event (as defined below) shall have
  occurred. For the purposes of this Agreement, a "Parent Triggering Event"
  shall be deemed to have occurred if: (i) the Board of Directors of Company
  or any committee thereof shall for any reason have withdrawn or shall have
  amended or modified in a manner adverse to Parent its recommendation in
  favor of, the adoption and approval of the Agreement or the approval of the
  Merger; (ii) Company shall have failed to include in the Proxy
  Statement/Prospectus the recommendation of the Board of Directors of
  Company in favor of the adoption and approval of the Agreement and the
  approval of the Merger; (iii) a tender or exchange offer relating to
  securities of the Company shall have been commenced by a Person
  unaffiliated with Parent and Company and the Board of Directors of Company
  fails to reaffirm its recommendation in favor of the adoption and approval
  of the Agreement and the approval of the Merger within ten (10) business
  days after Parent requests in writing at any time that such recommendation
  be reaffirmed; (iv) the Board of Directors of Company or any committee
  thereof shall have approved or publicly recommended any Acquisition
  Proposal; or (v) a tender or exchange offer relating to securities of
  Company shall have been commenced by a Person unaffiliated with Parent and
  Company shall not have sent to its security holders pursuant to Rule 14e-2
  promulgated under the Securities Act, within ten (10) business days after
  such tender or exchange offer is first published sent or given, a statement
  disclosing that Company recommends rejection of such tender or exchange
  offer.
 
    (g) by Company, upon a breach of any representation, warranty, covenant
  or agreement on the part of Parent set forth in this Agreement, or if any
  representation or warranty of Parent shall have become untrue, in either
  case such that the conditions set forth in Section 6.2(a) or Section 6.2(b)
  would not be satisfied as of the time of such breach or as of the time such
  representation or warranty shall have become untrue, provided that if such
  inaccuracy in Parent's representations and warranties or breach by Parent
  is curable
 
                                     A-32
<PAGE>
 
  by Parent through the exercise of its commercially reasonable efforts, then
  Company may not terminate this Agreement under this Section 7.1(g) for
  thirty days after delivery of written notice from Company to Parent of such
  breach, provided Parent continues to exercise commercially reasonable
  efforts to cure such breach (it being understood that Company may not
  terminate this Agreement pursuant to this paragraph (g) if it shall have
  materially breached this Agreement or if such breach by Parent is cured
  during such thirty day period); or
 
    (h) by Parent, upon a breach of any representation, warranty, covenant or
  agreement on the part of Company set forth in this Agreement, or if any
  representation or warranty of Company shall have become untrue, in either
  case such that the conditions set forth in Section 6.3(a) or Section 6.3(b)
  would not be satisfied as of the time of such breach or as of the time such
  representation or warranty shall have become untrue, provided that if such
  inaccuracy in Company's representations and warranties or breach by Company
  is curable by Company through the exercise of its commercially reasonable
  efforts, then Parent may not terminate this Agreement under this Section
  7.1(h) for thirty days after delivery of written notice from Parent to
  Company of such breach, provided Company continues to exercise commercially
  reasonable efforts to cure such breach (it being understood that Parent may
  not terminate this Agreement pursuant to this paragraph (h) if it shall
  have materially breached this Agreement or if such breach by Company is
  cured during such thirty day period).
 
  7.2 Notice of Termination; Effect of Termination. Any termination of this
Agreement under Section 7.1 above will be effective immediately upon the
delivery of written notice of the terminating party to the other parties
hereto. In the event of the termination of this Agreement as provided in
Section 7.1, this Agreement shall be of no further force or effect, except (i)
as set forth in this Section 7.2, Section 7.3 and Article 8 (miscellaneous),
each of which shall survive the termination of this Agreement, and (ii)
nothing herein shall relieve any party from liability for any willful breach
of this Agreement (including without limitation Section 5.4 hereof). No
termination of this Agreement shall affect the obligations of the parties
contained in the Confidentiality Agreement, all of which obligations shall
survive termination of this Agreement in accordance with their terms.
 
  7.3 Fees and Expenses.
 
  (a) General. Except as set forth in this Section 7.3, all fees and expenses
incurred in connection with this Agreement and the transactions contemplated
hereby shall be paid by the party incurring such expenses whether or not the
Merger is consummated; provided, however, that Parent and Company shall share
equally all fees and expenses, other than attorneys' and accountants fees and
expenses, incurred in relation to the printing and filing (with the SEC) of
the Proxy Statement/Prospectus (including any preliminary materials related
thereto) and the Registration Statement (including financial statements and
exhibits) and any amendments or supplements thereto.
 
  (b) Company Payments.
 
  (i) In the event that this Agreement is terminated by Parent or Company, as
applicable, pursuant to Section 7.1(e) or (f), Company shall pay, within one
business day following demand therefor, to Parent an amount equal to
$6,000,000 in immediately available funds.
 
  (ii) Company acknowledges that the agreements contained in this Section
7.3(b) are an integral part of the transactions contemplated by this
Agreement, and that, without these agreements, Parent would not enter into
this Agreement. If Company fails promptly to pay the amounts due pursuant to
this Section 7.3(b), and, in order to obtain such payment, Parent commences a
suit which results in a judgment against Company for the amounts set forth in
this Section 7.3(b), Company shall pay to Parent its reasonable costs and
expenses (including attorneys' fees and expenses) in connection with such
suit, together with interest on the amounts set forth in this Section 7.3(b)
at the prime rate of Citibank, N.A. in effect on the date such payment was
required to be made; provided, however, that if such suit does not result in a
judgment against Company, Parent shall pay to Company its reasonable costs and
expenses (including attorneys' fees and expenses) in connection with such
suit.
 
                                     A-33
<PAGE>
 
  (c) Payment of the fees described in Section 7.3(b) above shall not be in
lieu of damages incurred in the event of a willful breach of this Agreement.
 
  7.4 Amendment. Subject to applicable law, this Agreement may be amended by
the parties hereto at any time by execution of an instrument in writing signed
on behalf of each of Parent and Company.
 
  7.5 Extension; Waiver. At any time prior to the Effective Time any party
hereto may, to the extent legally allowed, (i) extend the time for the
performance of any of the obligations or other acts of the other parties
hereto, (ii) waive any inaccuracies in the representations and warranties made
to such party contained herein or in any document delivered pursuant hereto
and (iii) waive compliance with any of the agreements or conditions for the
benefit of such party contained herein. Any agreement on the part of a party
hereto to any such extension or waiver shall be valid only if set forth in an
instrument in writing signed on behalf of such party. Delay in exercising any
right under this Agreement shall not constitute a waiver of such right.
 
                                 ARTICLE VIII
 
                              GENERAL PROVISIONS
 
  8.1 Non-Survival of Representations and Warranties. The representations and
warranties of Company, Parent and Merger Sub contained in this Agreement shall
terminate at the Effective Time, and only the covenants that by their terms
survive the Effective Time shall survive the Effective Time.
 
  8.2 Notices. All notices and other communications hereunder shall be in
writing and shall be deemed given if delivered personally or by commercial
delivery service, or sent via telecopy (receipt confirmed) to the parties at
the following addresses or telecopy numbers (or at such other address or
telecopy numbers for a party as shall be specified by like notice):
 
  (a) if to Parent or Merger Sub, to:
 
    Quantum Corporation
    500 McCarthy Boulevard
    Milpitas, California 95035
    Attention: General Counsel
    Telephone No.: (408) 894-4000
    Telecopy No.: (408) 894-3218
 
    with a copy to:
 
    Wilson Sonsini Goodrich & Rosati
    Professional Corporation
    650 Page Mill Road
    Palo Alto, California 94304-1050
    Attention: Larry W. Sonsini, Esq.
    Steven E. Bochner, Esq.
    Telephone No.: (650) 493-9300
    Telecopy No.: (650) 493-6811
 
  (b) if to Company, to:
 
    ATL Products, Inc.
    2801 Kelvin Ave.
    Irvine, California 92614
    Attention: Chief Financial Officer
    Telephone No.: (949) 477-7800
    Telecopy No.: (949) 477-7890
 
                                     A-34
<PAGE>
 
    with copies to:
 
    Brobeck, Phleger & Harrison LLP
    Spear Street Tower
    One Market
    San Francisco, California 94105
    Attention: Steven L. Camahort, Esq.
    Telephone No.: (415) 442-0900
    Telecopy No.: (415) 442-1010
 
    and:
 
    Brobeck, Phleger & Harrison LLP
    38 Technology Drive
    Irvine, California 92618-2308
    Attention: Patrick Arrington, Esq.
    Telephone No.: (714) 790-6300
    Telecopy No.: (714) 790-6301
 
  8.3 Interpretation; Knowledge.
 
  (a) When a reference is made in this Agreement to Exhibits, such reference
shall be to an Exhibit to this Agreement unless otherwise indicated. When a
reference is made in this Agreement to Sections, such reference shall be to a
Section of this Agreement unless otherwise indicated. The words "include,"
"includes" and "including" when used herein shall be deemed in each case to be
followed by the words "without limitation." The table of contents and headings
contained in this Agreement are for reference purposes only and shall not
affect in any way the meaning or interpretation of this Agreement. When
reference is made herein to "the business of" an entity, such reference shall
be deemed to include the business of all direct and indirect subsidiaries of
such entity. Reference to the subsidiaries of an entity shall be deemed to
include all direct and indirect subsidiaries of such entity.
 
  (b) For purposes of this Agreement (a) as it relates to Parent, the term
"knowledge" means, with respect to any matter in question, that any of the
Chief Executive Officer, Chief Financial Officer or Controller of Parent has
actual knowledge of such matter; (b) as it relates to Company, the term
"knowledge" means, with respect to any matter in question, that any of the
Chief Executive Officer, Chief Financial Officer or Controller of Company has
actual knowledge of such matter.
 
  (c) For purposes of this Agreement, the term "Material Adverse Effect" when
used in connection with an entity means any change, event, violation,
inaccuracy, circumstance or effect that is materially adverse to the business,
assets (including intangible assets), capitalization, financial condition or
results of operations of such entity and its subsidiaries taken as a whole,
except for those changes, events, violations, inaccuracies, circumstances and
effects that (i) are caused by conditions affecting the United States economy
as a whole or affecting the industry in which such entity competes as a whole
or (ii) are related to or result from announcement or pendency of the Merger;
provided, however, that in the case of each of the exceptions set forth in (i)
and (ii) above, the entity relying upon such exception to demonstrate that a
Material Adverse Effect has not occurred shall bear the burden of proof, by a
preponderance of the evidence, that such exception is applicable.
 
  (d) For purposes of this Agreement, the term "person" shall mean any
individual, corporation (including any non-profit corporation), general
partnership, limited partnership, limited liability partnership, joint
venture, estate, trust, company (including any limited liability company or
joint stock company), firm or other enterprise, association, organization,
entity or Governmental Entity.
 
  8.4 Counterparts. This Agreement may be executed in one or more
counterparts, all of which shall be considered one and the same agreement and
shall become effective when one or more counterparts have been
 
                                     A-35
<PAGE>
 
signed by each of the parties and delivered to the other party, it being
understood that all parties need not sign the same counterpart.
 
  8.5 Entire Agreement; Third Party Beneficiaries. This Agreement and the
documents and instruments and other agreements among the parties hereto as
contemplated by or referred to herein, including the Company Schedules and the
Parent Schedules (a) constitute the entire agreement among the parties with
respect to the subject matter hereof and supersede all prior agreements and
understandings, both written and oral, among the parties with respect to the
subject matter hereof, it being understood that the Confidentiality Agreement
shall continue in full force and effect until the Closing and shall survive
any termination of this Agreement; and (b) are not intended to confer upon any
other person any rights or remedies hereunder, except as specifically provided
in Section 5.10.
 
  8.6 Severability. In the event that any provision of this Agreement or the
application thereof, becomes or is declared by a court of competent
jurisdiction to be illegal, void or unenforceable, the remainder of this
Agreement will continue in full force and effect and the application of such
provision to other persons or circumstances will be interpreted so as
reasonably to effect the intent of the parties hereto. The parties further
agree to replace such void or unenforceable provision of this Agreement with a
valid and enforceable provision that will achieve, to the extent possible, the
economic, business and other purposes of such void or unenforceable provision.
 
  8.7 Other Remedies; Specific Performance. Except as otherwise provided
herein, any and all remedies herein expressly conferred upon a party will be
deemed cumulative with and not exclusive of any other remedy conferred hereby,
or by law or equity upon such party, and the exercise by a party of any one
remedy will not preclude the exercise of any other remedy. The parties hereto
agree that irreparable damage would occur in the event that any of the
provisions of this Agreement were not performed in accordance with their
specific terms or were otherwise breached. It is accordingly agreed that the
parties shall be entitled to seek an injunction or injunctions to prevent
breaches of this Agreement and to enforce specifically the terms and
provisions hereof in any court of the United States or any state having
jurisdiction, this being in addition to any other remedy to which they are
entitled at law or in equity.
 
  8.8 Governing Law. This Agreement shall be governed by and construed in
accordance with the laws of the State of Delaware, regardless of the laws that
might otherwise govern under applicable principles of conflicts of law
thereof.
 
  8.9 Rules of Construction. The parties hereto agree that they have been
represented by counsel during the negotiation and execution of this Agreement
and, therefore, waive the application of any law, regulation, holding or rule
of construction providing that ambiguities in an agreement or other document
will be construed against the party drafting such agreement or document.
 
  8.10 Assignment. No party may assign either this Agreement or any of its
rights, interests, or obligations hereunder without the prior written approval
of the other parties. Subject to the preceding sentence, this Agreement shall
be binding upon and shall inure to the benefit of the parties hereto and their
respective successors and permitted assigns.
 
  8.11 Waiver of Jury Trial. EACH OF PARENT, COMPANY AND MERGER SUB HEREBY
IRREVOCABLY WAIVES ALL RIGHT TO TRIAL BY JURY IN ANY ACTION, PROCEEDING OR
COUNTERCLAIM (WHETHER BASED ON CONTRACT, TORT OR OTHERWISE) ARISING OUT OF OR
RELATING TO THIS AGREEMENT OR THE ACTIONS OF PARENT, COMPANY OR MERGER SUB IN
THE NEGOTIATION, ADMINISTRATION, PERFORMANCE AND ENFORCEMENT HEREOF.
 
 
                                     A-36
<PAGE>
 
  IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
executed by their duly authorized respective officers as of the date first
written above.
 
                                          QUANTUM CORPORATION
 
                                                   
                                          By:      /s/ Michael A. Brown
                                             ---------------------------------- 
                                                     
                                          Name:        Michael A. Brown
                                               -------------------------------- 
                                                            
                                          Title:         CEO
                                                -------------------------------
 
                                          QUICK ACQUISITION CORPORATION
 
                                                  
                                          By:     /s/ Richard L. Clemmer
                                             ---------------------------------- 

                                                    
                                          Name:     Richard L. Clemmer
                                               --------------------------------
 
                                          Title:         CEO
                                                -------------------------------
 
                                          ATL PRODUCTS, INC.
 
                                                     
                                          By:        /s/ Kevin C. Daly
                                             ---------------------------------- 
                                                       
                                          Name:        Kevin C. Daly
                                               --------------------------------
 
                                          Title:         CEO
                                                -------------------------------
 
           [Signature Page to Agreement and Plan of Reorganization]
 
                                     A-37
<PAGE>
 
                                                                     APPENDIX B
 
                                 May 18, 1998
 
Board of Directors
ATL Products, Inc.
2801 Kelvin Avenue
Irvine, California 92614
 
Ladies and Gentlemen:
 
  We understand that Quantum Corporation, a Delaware corporation ("Parent"),
Quick Acquisition Corporation, a Delaware corporation and wholly-owned
subsidiary of Parent ("Merger Subsidiary"), and ATL Products, Inc., a Delaware
corporation ("Company"), have entered into an Agreement and Plan of
Reorganization, dated as of May 18, 1998, (the "Merger Agreement"), pursuant
to which the Merger Subsidiary will be merged with and into the Company, which
will be the surviving entity (the "Merger"). Pursuant to the Merger, as more
fully described in the Merger Agreement, we understand that each share of
Class A Common Stock, $.0001 par value per share ("Company Class A Stock"), of
the Company, and Class B Common Stock, $.0001 par value per share (the
"Company Class B Stock" and, together with the Company Class A Stock, the
"Company Common Stock"), of the Company will be canceled and extinguished and
automatically converted into the right to receive that number of shares of
Common Stock of the Parent ("Parent Common Stock") equal to the quotient
determined by dividing (i) $29.00 by (ii) the average closing price of Parent
Common Stock as reported on the Nasdaq National Market System for the Pricing
Period as defined in the Merger Agreement, subject to an adjustment described
in Section 1.6(g) of the Merger Agreement (the "Exchange Ratio"). Further, as
more fully described in the Merger Agreement, we understand that each share of
Company Common Stock held by the Company, the Merger Subsidiary or the Parent
or any of their respective wholly-owned subsidiaries immediately prior to the
Merger will be canceled and extinguished without any conversion thereof and
each outstanding share of the common stock, $.0001 par value per share
("Merger Sub Common Stock"), of the Merger Subsidiary will be converted into
and exchangeable for one share of Company Common Stock. The terms and
conditions of the Merger are set forth in more detail in the Merger Agreement.
 
  You have asked for our opinion as investment bankers as to whether the
Exchange Ratio is fair to the stockholders of the Company from a financial
point of view, pursuant to the Merger and as of the date hereof. As you are
aware, we were not requested to nor did we solicit or assist Company in
soliciting indications of interest from third parties for all or any part of
Company.
 
  In connection with our opinion, we have, among other things: (i) reviewed
certain publicly available financial and other data with respect to the
Company and the Parent, including the consolidated financial statements for
recent years and interim periods to June 30, 1997, interim unaudited financial
statements for the period to December 31, 1997 in respect of the Company and
December 28, 1997 in respect of the Parent, and certain other relevant
financial and operating data relating to the Company made available to us from
published sources and from the internal records of the Company; (ii) reviewed
the financial terms and conditions of the Merger Agreement; (iii) reviewed
certain publicly available information concerning the trading of, and the
trading market for, the Company Common Stock and the Parent Common Stock; (iv)
compared the Company from a financial point of view with certain other
companies in the storage component and system technology industries which we
deemed to be relevant; (v) considered the financial terms, to the extent
publicly available, of selected recent business combinations of companies in
the technology manufacturing, communications, network management,
semiconductor capital equipment and semiconductor device industries which we
deemed to be comparable, in whole or in part, to the Merger; (vi) considered
the premiums paid in comparable public market acquisitions of selected
businesses within the technology industry; (vii) reviewed and discussed with
representatives of the management of the Company certain information of a
business and financial nature regarding the Company, furnished to us by them,
including financial forecasts and related assumptions of the
 
                                      B-1
<PAGE>
 
Company; (viii) made inquiries regarding and discussed the Merger and the
Merger Agreement and other matters related thereto with the Company's counsel;
and (ix) performed such other analyses and examinations as we have deemed
appropriate.
 
  In connection with our review, we have not assumed any obligation
independently to verify the foregoing information and have relied on its being
accurate and complete in all material respects. With respect to the financial
forecasts for the Company provided to us by the Company's management, upon its
advice and with your consent we have assumed for purposes of our opinion that
the forecasts have been reasonably prepared on bases reflecting the best
available estimates and judgments of the Company's management at the time of
preparation as to the future financial performance of the Company and that
they provide a reasonable basis upon which we can form our opinion. The
Company does not publicly disclose internal management forecasts and the type
provided to us by the management of the Company in connection with our review
of the Merger. Such forecasts were not prepared with a view toward public
disclosure. In addition, such forecasts were based upon numerous variables and
assumptions that are inherently uncertain including, without limitation,
factors related to general economic and competitive conditions. Accordingly,
actual results could vary significantly from those set forth in such
forecasts. We have assumed no liability for such forecasts. We have also
assumed that there have been no material changes in the Company's or the
Parent's assets, financial condition, results of operations, business or
prospects since the respective dates of their last financial statements made
available to us. We have relied on advice of counsel and independent
accountants to the Company as to all legal and financial reporting matters
with respect to the Company, the Merger and the Merger Agreement. We have
assumed that the Merger will be consummated in a manner that complies in all
respects with the applicable provisions of the Securities Act of 1933, as
amended (the "Securities Act"), the Securities Exchange Act of 1934 and all
other applicable federal and state statutes, rules and regulations. In
addition, we have not assumed responsibility for making an independent
evaluation, appraisal or physical inspection of any of the assets or
liabilities (contingent or otherwise) of the Company or the Parent, nor have
we been furnished with any such appraisals. You have informed us, and we have
assumed, that the Merger will be recorded as a purchase transaction under
generally accepted accounting principles. Finally, our opinion is based on
economic, monetary and market and other conditions as in effect on, and the
information made available to us as of, the date hereof. Accordingly, although
subsequent developments may affect this opinion, we have not assumed any
obligation to update, revise or reaffirm this opinion.
 
  We have further assumed with your consent that the Merger will be
consummated in accordance with the terms described in the Merger Agreement,
without any further amendments thereto, and without waiver by the Company of
any of the conditions to its obligations thereunder.
 
  In the ordinary course of our business, we actively trade the equity
securities of the Company and the Parent for our own account and for the
accounts of customers and, accordingly, may at any time hold a long or short
position in such securities. We have also acted as an underwriter in
connection with the initial public offering of the Company Common Stock and
have performed various investment banking services for the Company.
 
  Based upon the foregoing and in reliance thereon, it is our opinion as
investment bankers that the Exchange Ratio is fair to the stockholders of the
Company from a financial point of view, pursuant to the Merger and as of the
date hereof.
 
  We are not expressing an opinion regarding the price at which the Parent
Common Stock may trade at any future time. The Exchange Ratio determining the
number of shares of Parent Common Stock to be received by the shareholders of
the Company pursuant to the Merger is based upon an exchange ratio determined
on the basis of the market price for the Parent Common Stock prior to the
closing subject to an adjustment, and, accordingly, the Exchange Ratio may
vary.
 
  This opinion is directed to the Board of Directors of the Company in its
consideration of the Merger and is not a recommendation to any stockholder as
to how such stockholder should vote with respect to the Merger. Further, this
opinion addresses only the financial fairness of the Exchange Ratio to the
stockholders of the
 
                                      B-2
<PAGE>
 
Company and does not address the relative merits of the Merger and any
alternatives to the Merger, the Company's underlying decision to proceed with
or affect the Merger or any other aspect of the Merger. This opinion may not
be used or referred to by the Company, or quoted or disclosed to any person in
any manner, without our prior written consent, which consent is hereby given
to the inclusion of this opinion in any proxy statement or prospectus filed
with the Securities and Exchange Commission in connection with the Merger. In
furnishing this opinion, we do not admit that we are experts within the
meaning of the term "experts" as used in the Securities Act and the rules and
regulations promulgated thereunder, nor do we admit that this opinion
constitutes a report or valuation within the meaning of Section 11 of the
Securities Act.
 
                                     Very truly yours,
 
                                     /s/ NationsBanc Montgomery Securities LLC
 
                                     NATIONSBANC MONTGOMERY SECURITIES LLC
 
 
                                      B-3
<PAGE>
 
                                  APPENDIX C
 
      SECTION 262 OF THE GENERAL CORPORATION LAW OF THE STATE OF DELAWARE
 
  (a) Any stockholder of a corporation of this State who holds shares of stock
on the date of the making of a demand pursuant to subsection (d) of this
section with respect to such shares, who continuously holds such shares
through the effective date of the merger or consolidation, who has otherwise
complied with subsection (d) of this section and who has neither voted in
favor of the merger or consolidation nor consented thereto in writing pursuant
to (S)228 of this title shall be entitled to an appraisal by the Court of
Chancery of the fair value of his shares of stock under the circumstances
described in subsections (b) and (c) of this section. As used in this section,
the word "stockholder" means a holder of record of stock in a stock
corporation and also a member of record of a nonstock corporation; the words
"stock" and "share" mean and include what is ordinarily meant by those words
and also membership or membership interest of a member of a nonstock
corporation; and the words "depository receipt" mean a receipt or other
instrument issued by a depository representing an interest in one or more
shares, or fractions thereof, solely of stock of a corporation, which stock is
deposited with the depository.
 
  (b) Appraisal rights shall be available for the shares of any class or
series of stock of a constituent corporation in a merger or consolidation to
be effected pursuant to (S)(S)251 (other than a merger effected pursuant to
(S)251(g) of this title), (S)252, (S)254, (S)257, (S)258, (S)263 or (S)264 of
this title:
 
    (1) Provided, however, that no appraisal rights under this section shall
  be available for the shares of any class or series of stock, which stock,
  or depository receipts in respect thereof, at the record date fixed to
  determine the stockholders entitled to receive notice of and to vote at the
  meeting of stockholders to act upon the agreement of merger or
  consolidation, were either (i) listed on a national securities exchange or
  designated as a national market system security on an interdealer quotation
  system by the National Association of Securities Dealers, Inc., or (ii)
  held of record by more than 2,000 holders; and further provided that no
  appraisal rights shall be available for any shares of stock of the
  constituent corporation surviving a merger if the merger did not require
  for its approval the vote of the holders of the surviving corporation as
  provided in subsection (f) of (S)251 of this title.
 
    (2) Notwithstanding paragraph (1) of this subsection, appraisal rights
  under this section shall be available for the shares of any class or series
  of stock of a constituent corporation if the holders thereof are required
  by the terms of an agreement of merger or consolidation pursuant to
  (S)(S)251, 252, 254, 257, 258, 263 and 264 of this title to accept for such
  stock anything except:
 
      a. Shares of stock of the corporation surviving or resulting from
    such merger or consolidation, or depository receipts in respect
    thereof;
 
      b. Shares of stock of any other corporation, or depository receipts
    in respect thereof, which shares of stock (or depository receipts in
    respect thereof) or depository receipts at the effective date of the
    merger or consolidation will be either listed on a national securities
    exchange or designated as a national market system security on an
    interdealer quotation system by the National Association of Securities
    Dealers, Inc. or held of record by more than 2,000 holders;
 
      c. Cash in lieu of fractional shares or fractional depository
    receipts described in the foregoing subparagraphs a. and b. of this
    paragraph; or
 
      d. Any combination of the shares of stock, depository receipts and
    cash in lieu of fractional shares or fractional depository receipts
    described in the foregoing subparagraphs a., b., and c. of this
    paragraph.
 
    (3) In the event all of the stock of a subsidiary Delaware corporation
  party to a merger effected under (S)253 of this title is not owned by the
  parent corporation immediately prior to the merger, appraisal rights shall
  be available for the shares of the subsidiary Delaware corporation.
 
                                      C-1
<PAGE>
 
  (c) Any corporation may provide in its certificate of incorporation that
appraisal rights under this section shall be available for the shares of any
class or series of its stock as a result of an amendment to its certificate of
incorporation, any merger or consolidation in which the corporation is a
constituent corporation or the sale of all or substantially all of the assets
of the corporation. If the certificate of incorporation contains such a
provision, the procedures of this section, including those set forth in
subsections (d) and (e) of this section, shall apply as nearly as is
practicable.
 
  (d) Appraisal rights shall be perfected as follows:
 
    (1) If a proposed merger or consolidation for which appraisal rights are
  provided under this section is to be submitted for approval at a meeting of
  stockholders, the corporation, not less than 20 days prior to the meeting,
  shall notify each of its stockholders who was such on the record date for
  such meeting with respect to shares for which appraisal rights are
  available pursuant to subsections (b) or (c) hereof that appraisal rights
  are available for any or all of the shares of the constituent corporations,
  and shall included in such notice a copy of this section. Each stockholder
  electing to demand the appraisal of his shares shall deliver to the
  corporation, before the taking of the vote on the merger or consolidation,
  a written demand for appraisal of his shares. Such demand will be
  sufficient if it reasonably informs the corporation of the identity of the
  stockholder and that the stockholder intends thereby to demand the
  appraisal of his shares. A proxy or vote against the merger or
  consolidation shall not constitute such a demand. A stockholder electing to
  take such action must to do by a separate written demand as herein
  provided. Within 10 days after the effective date of such merger or
  consolidation, the surviving or resulting corporation shall notify each
  stockholder of each constituent corporation who has complied with this
  subsection and has not voted in favor of or consented to the merger or
  consolidation of the date that the merger or consolidation has become
  effective; or
 
    (2) If the merger or consolidation was approved pursuant to (S)228 or
  (S)253 of this title, each constituent corporation, either before the
  effective date of the merger or consolidation or within ten days
  thereafter, shall notify each of the holders of any class or series of
  stock of such constituent corporation who are entitled to appraisal rights
  of the approval of the merger or consolidation and that appraisal rights
  are available for any or all shares of such class or series of stock of
  such constituent corporation, and shall include in such notice a copy of
  this section; provided that, if the notice is given on or after the
  effective date of the merger or consolidation, such notice shall be given
  by the surviving or resulting corporation to all holders of any class or
  series of stock of a constituent corporation that are entitled to appraisal
  rights. Such notice may, and, if given on or after the effective date of
  the merger or consolidation, shall, also notify such stockholders of the
  effective date of the merger or consolidation. Any stockholder entitled to
  appraisal rights may, within 20 days after the date of mailing of such
  notice, demand in writing from the surviving or resulting corporation the
  appraisal of such holder's shares. Such demand will be sufficient if it
  reasonably informs the corporation of the identity of the stockholder and
  that the stockholder intends thereby to demand the appraisal of such
  holder's shares. If such notice did not notify stockholders of the
  effective date of the merger or consolidation, either (i) each such
  constituent corporation shall send a second notice before the effective
  date of the merger or consolidation notifying each of the holders of any
  class or series of stock of such constituent corporation that are entitled
  to appraisal rights of the effective date of the merger or consolidation or
  (ii) the surviving or resulting corporation shall send such a second notice
  to all such holders on or within 10 days after such effective date;
  provided, however, that if such second notice is sent more than 20 days
  following the sending of the first notice, such second notice need only be
  sent to each stockholder who is entitled to appraisal rights and who has
  demanded appraisal of such holder's shares in accordance with this
  subsection. An affidavit of the secretary or assistant secretary or of the
  transfer agent of the corporation that is required to give either notice
  that such notice has been given shall, in the absence of fraud, be prima
  facie evidence of the facts stated therein. For purposes of determining the
  stockholders entitled to receive either notice, each constituent
  corporation may fix, in advance, a record date that shall be not more than
  10 days prior to the date the notice is given, provided, that if the notice
  is given on or after the effective date of the merger or consolidation, the
  record date shall be such effective date. If no record date is fixed and
  the notice is given prior to the effective date, the record date shall be
  the close of business on the day next preceding the day on which the notice
  is given.
 
                                      C-2
<PAGE>
 
  (e) Within 120 days after the effective date of the merger or consolidation,
the surviving or resulting corporation or any stockholder who has complied
with subsections (a) and (d) hereof and who is otherwise entitled to appraisal
rights, may file a petition in the Court of Chancery demanding a determination
of the value of the stock of all such stockholders. Notwithstanding the
foregoing, at any time within 60 days after the effective date of the merger
or consolidation, any stockholder shall have the right to withdraw his demand
for appraisal and to accept the terms offered upon the merger or
consolidation. Within 120 days after the effective date of the merger or
consolidation, any stockholder who has complied with the requirements of
subsections (a) and (d) hereof, upon written request, shall be entitled to
receive from the corporation surviving the merger or resulting from the
consolidation a statement setting forth the aggregate number of shares not
voted in favor of the merger or consolidation and with respect to which
demands for appraisal have been received and the aggregate number of holders
of such shares. Such written statement shall be mailed to the stockholder with
in 10 days after his written request for such a statement is received by the
surviving or resulting corporation or within 10 days after expiration of the
period for delivery of demands for appraisal under subsection (d) hereof,
whichever is later.
 
  (f) Upon the filing of any such petition by a stockholder, service of a copy
thereof shall be made upon the surviving or resulting corporation, which shall
within 20 days after such service file in the office of the Register in
Chancery in which the petition was filed a duly verified list containing the
names and addresses of all stockholders who have demanded payment for their
shares and with whom agreements as to the value of their shares have not been
reached by the surviving or resulting corporation. If the petition shall be
filed by the surviving or resulting corporation the petition shall be
accompanied by such a duly verified list. The Register in Chancery, if so
ordered by the Court, shall give notice of the time and place fixed for the
hearing of such petition by registered or certified mail to the surviving or
resulting corporation and to the stockholders shown on the list at the
addresses therein stated. Such notice shall also be given by 1 or more
publications at least 1 week before the day of the hearing, in a newspaper of
general circulation published in the City of Wilmington, Delaware or such
publication as the Court deems advisable. The forms of the notices by mail and
by publication shall be approved by the Court, and the costs thereof shall be
borne by the surviving or resulting corporation.
 
  (g) At the hearing on such petition, the Court shall determine the
stockholders who have complied with this section and who have become entitled
to appraisal rights. The Court may require the stockholders who have demanded
an appraisal for their shares and who hold stock represented by certificates
to submit their certificates of stock to the Register in Chancery for notation
thereon of the pendency of the appraisal proceedings; and if any stockholder
fails to comply with such direction, the Court may dismiss the proceedings as
to such stockholder.
 
  (h) After determining the stockholders entitled to an appraisal, the Court
shall appraise the shares, determining their fair value exclusive of any
element of value arising from the accomplishment or expectation of the merger
or consolidation, together with a fair rate of interest, if any, to be paid
upon the amount determined to be the fair value. In determining such fair
value, the Court shall take into account all relevant factors. In determining
the fair rate of interest, the Court may consider all relevant factors,
including the rate of interest which the surviving or resulting corporation
would have had to pay to borrow money during the pendency of the proceeding.
Upon application by the surviving or resulting corporation or by any
stockholder entitled to participate in the appraisal proceeding, the Court
may, in its discretion, permit discovery or other pretrial proceedings and may
proceed to trial upon the appraisal prior to the final determination of the
stockholder entitled to an appraisal. Any stockholder whose name appears on
the list filed by the surviving or resulting corporation pursuant to
subsection (f) of this section and who has submitted his certificates of stock
to the Register in Chancery, if such is required, may participate fully in all
proceedings until it is finally determined that he is not entitled to
appraisal rights under this section.
 
  (i) The Court shall direct the payment of the fair value of the shares,
together with interest, if any, by the surviving or resulting corporation to
the stockholders entitled thereto. Interest may be simple or compound, as the
Court may direct. Payment shall be so made to each such stockholder, in the
case of holders of uncertificated
 
                                      C-3
<PAGE>
 
stock forthwith, and the case of holders of shares represented by certificates
upon the surrender to the corporation of the certificates representing such
stock. The Court's decree may be enforced as other decrees in the Court of
Chancery may be enforced, whether such surviving or resulting corporation be a
corporation of this State or of any state.
 
  (j) The costs of the proceeding may be determined by the Court and taxed
upon the parties as the Court deems equitable in the circumstances. Upon
application of a stockholder, the Court may order all or a portion of the
expenses incurred by any stockholder in connection with the appraisal
proceeding, including, without limitation, reasonable attorney's fees and the
fees and expenses of experts, to be charged pro rata against the value of all
the shares entitled to an appraisal.
 
  (k) From and after the effective date of the merger or consolidation, no
stockholder who has demanded his appraisal rights as provided in subsubsection
(d) of this section shall be entitled to vote such stock for any purpose or to
receive payment of dividends or other distributions on the stock (except
dividends or other distributions payable to stockholders of record at a date
which is prior to the effective date of the merger or consolidation);
provided, however, that if no petition for an appraisal shall be filed within
the time provided in subsection (e) of this section, or if such stockholder
shall deliver to the surviving or resulting corporation a written withdrawal
of his demand for an appraisal and an acceptance of the merger or
consolidation, either within 60 days after the effective date of the merger or
consolidation as provided in subsection (e) of this section or thereafter with
the written approval of the corporation, then the right of such stockholder to
an appraisal shall cease. Notwithstanding the foregoing, no appraisal
proceeding in the Court of Chancery shall be dismissed as to any stockholder
without the approval of the Court, and such approval may be conditioned upon
such terms as the Court deems just.
 
  (l) The shares of the surviving or resulting corporation to which the shares
of such objecting stockholders would have been converted had they assented to
the merger or consolidation shall have the status of authorized and unissued
shares of the surviving or resulting corporation.
 
 
                                      C-4
<PAGE>
 
                                    PART II
 
                    INFORMATION NOT REQUIRED IN PROSPECTUS
 
ITEM 20. INDEMNIFICATION OF DIRECTORS AND OFFICERS
 
  Section 145 of the Delaware General Corporation Law authorizes a court to
award, or a corporation's Board of Directors to grant, indemnification to
directors and officers in terms sufficiently broad to permit such
indemnification under certain circumstances for liabilities (including
reimbursement for expenses incurred) arising under the Securities Act. The
Registrant's Bylaws provide for the mandatory indemnification of its
directors, officers, employees and other agents to the maximum extent
permitted by Delaware General Corporation Law, and the Company has entered
into agreements with its officers, directors and certain key employees
implementing such indemnification.
 
ITEM 21. EXHIBITS AND FINANCIAL STATEMENT SCHEDULES
 
  (A) EXHIBITS
 
<TABLE>
<CAPTION>
                                                                    SEQUENTIAL
   EXHIBIT NO.                     DESCRIPTION                      PAGE NUMBER
   -----------                     -----------                      -----------
   <C>         <S>                                                  <C>
       2.1     Agreement and Plan of Reorganization, dated as of
                May 18, 1998, among Quantum Corporation, ATL
                Products, Inc. and Quick Acquisition Corporation
                ("Merger Agreement") (included as Appendix A to
                the Proxy Statement/Prospectus).
       2.2     Form of Affiliate Agreement for ATL Products, Inc.
 
       2.3     Voting Agreement between Registrant and Kevin C.
                Daly dated May 18, 1998.
       2.4     Form of Noncompetition Agreement.
       4.1     Preferred Shares Rights Agreement, dated as of
                July 28, 1998, between the Registrant and Harris
                Trust and Savings Bank, as Rights Agent
                (incorporated by reference to Registrant's
                Registration Statement on Form 8-A filed with the
                SEC on August 4, 1988, relating to Registrant's
                Preferred Share Purchase Rights).
       5.1     Opinion of Wilson Sonsini Goodrich & Rosati, P.C.
                as to the legality of the securities being
                registered.
       8.1     Opinion of Wilson Sonsini Goodrich & Rosati P.C.
                regarding certain tax matters and consequences to
                stockholders.
       8.2     Opinion of Brobeck, Phleger & Harrison LLP
                regarding certain tax matters and consequences to
                stockholders.
      23.1     Consent of Wilson Sonsini Goodrich & Rosati, P.C.
                (included in opinion filed as Exhibit 5.1).
      23.2     Consent of Brobeck, Phleger & Harrison LLP
                (included in opinion filed as Exhibit 8.2).
      23.3     Consent of Ernst & Young LLP, Independent
                Auditors.
      23.4     Consent of KPMG Peat Marwick LLP, Independent
                Accountants.
      23.5     Consent of Ernst & Young LLP, Independent
                Auditors.
      24.1     Power of Attorney (included on page II-3 hereof).
      99.1     ATL Products, Inc. Form of Proxy for Special
                Meeting to be held on
                September 24, 1998.
</TABLE>
 
  (B) FINANCIAL STATEMENT SCHEDULES
 
  Schedules not listed above have been omitted because the information
required to be set forth therein is not applicable or is shown in the
financial statements, management's discussion and analysis or notes thereto.
 
                                     II-1
<PAGE>
 
ITEM 22. UNDERTAKINGS
 
  (1) The Registrant hereby undertakes that, for purposes of determining any
liability under the Securities Act of 1933, each filing of Registrant's annual
report pursuant to section 13(a) or section 15(d) of the Securities Exchange
Act of 1934 (and, where applicable, each filing of an employee benefit plan's
annual report pursuant to section 15(d) of the Securities Exchange Act of
1934) that is incorporated by reference in this Registration Statement shall
be deemed to be a new registration statement relating to the securities
offered therein, and the offering of such securities at that time shall be
deemed to be the initial bona fide offering thereof.
 
  (2) The undersigned Registrant hereby undertakes as follows: that prior to
any public reoffering of the securities registered hereunder through use of a
prospectus which is a part of this Registration Statement, by any person or
party who is deemed to be an underwriter within the meaning of Rule 145(c),
the undersigned Registrant undertakes that such reoffering prospectus will
contain the information called for by the applicable registration form with
respect to reofferings by persons who may be deemed underwriters, in addition
to the information called for by the other Items of the applicable form.
 
  (3) The Registrant undertakes that every prospectus (i) that is filed
pursuant to paragraph (2) immediately preceding, or (ii) that purports to meet
the requirements of Section 10(a)(3) of the Act and is used in connection with
an offering of securities subject to Rule 415, will be filed as a part of an
amendment to the Registration Statement and will not be used until such
amendment is effective, and that, for purposes of determining any liability
under the Securities Act of 1933, each such post-effective amendment shall be
deemed to be a new Registration Statement relating to the securities offered
therein, and the offering of such securities at that time shall be deemed to
be the initial bona fide offering thereof.
 
  (4) Insofar as indemnification for liabilities arising under the Securities
Act of 1933 may be permitted to directors, officers and controlling persons of
the Registrant pursuant to the foregoing provisions, or otherwise, the
Registrant has been advised that in the opinion of the Securities and Exchange
Commission such indemnification is against public policy as expressed in the
Act and is, therefore, unenforceable. In the event that a claim for
indemnification against such liabilities (other than the payment by the
Registrant of expenses incurred or paid by a director, officer or controlling
person of the Registrant in the successful defense of any action, suit or
proceeding) is asserted by such director, officer or controlling person in
connection with the securities being registered, the Registrant will, unless
in the opinion of its counsel the matter has been settled by controlling
precedent, submit to a court of appropriate jurisdiction the question whether
such indemnification by it is against public policy as expressed in the Act
and will be governed by the final adjudication of such issue.
 
  (5) The undersigned Registrant hereby undertakes to respond to requests for
information that is incorporated by reference into the Prospectus pursuant to
Items 4, 10(b), 11 or 13 of this Form, within one business day of receipt of
such request, and to send the incorporated documents by first class mail or
other equally prompt means. This includes information contained in documents
filed subsequent to the effective date of the Registration Statement through
the date of responding to the request.
 
  The undersigned Registrant hereby undertakes to supply by means of a post-
effective amendment all information concerning a transaction, and the company
being acquired involved therein, that was not the subject of and included in
the Registration Statement when it became effective.
 
                                     II-2
<PAGE>
 
                                   SIGNATURES
 
  PURSUANT TO THE REQUIREMENTS OF THE SECURITIES ACT OF 1933, AS AMENDED, THE
REGISTRANT HAS DULY CAUSED THIS REGISTRATION STATEMENT TO BE SIGNED ON ITS
BEHALF BY THE UNDERSIGNED, THEREUNTO DULY AUTHORIZED, ON THE 18TH DAY OF AUGUST
1998.
 
                                         Quantum Corporation
 
                                             
                                         By:       /s/ Michael A. Brown
                                            ----------------------------------- 
                                                    MICHAEL A. BROWN
                                            CHAIRMAN OF THE BOARD AND CHIEF
                                                   EXECUTIVE OFFICER
 
                               POWER OF ATTORNEY
 
  KNOW ALL THESE PERSONS BY THESE PRESENTS, that each person whose signature
appears below constitutes and appoints Richard L. Clemmer and Andrew Kryder and
each of them, jointly and severally, as his attorneys-in-fact, each with full
power of substitution for him in any and all capacities, to sign any and all
amendments to this Registration Statement, and to file the same, with exhibits
thereto and other documents in connection therewith, with the Securities and
Exchange Commission, hereby ratifying and confirming all that each said
attorneys-in-fact or his substitute or substitutes, may do or cause to be done
by virtue hereof.
 
  PURSUANT TO THE REQUIREMENTS OF THE SECURITIES ACT OF 1933, AS AMENDED, THIS
REGISTRATION STATEMENT HAS BEEN SIGNED BY THE FOLLOWING PERSONS IN THE
CAPACITIES AND ON THE DATES INDICATED:
 
             SIGNATURE                      CAPACITY               DATE
 
      /s/ Michael A. Brown            Chairman of the        August 18, 1998
- ------------------------------------   Board and Chief
         (MICHAEL A. BROWN)            Executive Officer
 
     /s/ Richard L. Clemmer           Vice President,        August 18, 1998
- ------------------------------------   Finance and
        (RICHARD L. CLEMMER)           Administration,
                                       Chief Financial
                                       Officer
 
    /s/ Steven C. Wheelwright         Director               August 18, 1998
- ------------------------------------
      (STEVEN C. WHEELWRIGHT)
 
     /s/ Stephen M. Berkeley          Director               August 18, 1998
- ------------------------------------
       (STEPHEN M. BERKELEY)
 
       /s/ David A. Brown             Director               August 18, 1998
- ------------------------------------
          (DAVID A. BROWN)
 
                                      II-3
<PAGE>
 
                                 EXHIBIT INDEX
 
<TABLE>
<CAPTION>
                                                                    SEQUENTIAL
 EXHIBIT NO.                      DESCRIPTION                       PAGE NUMBER
 -----------                      -----------                       -----------
 <C>         <S>                                                    <C>
     2.1     Agreement and Plan of Reorganization, dated as of
              May 18, 1998, among Quantum Corporation, ATL
              Products, Inc. and Quick Acquisition Corporation
              ("Merger Agreement") (included as Appendix A to the
              Proxy Statement/Prospectus).
     2.2     Form of Affiliate Agreement for ATL Products, Inc.
     2.3     Voting Agreement between Registrant and Kevin C.
              Daly dated May 18, 1998.
     2.4     Form of Noncompetition Agreement.
     4.1     Preferred Shares Rights Agreement, dated as of July
              28, 1998, between the Registrant and Harris Trust
              and Savings Bank, as Rights Agent (incorporated by
              reference to Registrant's Registration Statement on
              Form 8-A filed with the SEC on August 4, 1988,
              relating to Registrant's Preferred Share Purchase
              Rights).
     5.1     Opinion of Wilson Sonsini Goodrich & Rosati, P.C. as
              to the legality of the securities being registered.
 
     8.1     Opinion of Wilson Sonsini Goodrich & Rosati P.C.
              regarding certain tax matters and consequences to
              stockholders.
     8.2     Opinion of Brobeck, Phleger & Harrison LLP regarding
              certain tax matters and consequences to
              stockholders.
    23.1     Consent of Wilson Sonsini Goodrich & Rosati, P.C.
              (included in opinion filed as Exhibit 5.1).
    23.2     Consent of Brobeck, Phleger & Harrison LLP (included
              in opinion filed as Exhibit 8.2).
    23.3     Consent of Ernst & Young LLP, Independent Auditors.
    23.4     Consent of KPMG Peat Marwick LLP, Independent
              Accountants.
    23.5     Consent of Ernst & Young LLP, Independent Auditors.
    24.1     Power of Attorney (included on page II-3 hereof).
    99.1     ATL Products, Inc. Form of Proxy for Special Meeting
              to be held on September 24, 1998.
</TABLE>

<PAGE>
 
                                                                     EXHIBIT 2.2


                    ATL PRODUCTS, INC. AFFILIATE AGREEMENT



     This AFFILIATE AGREEMENT ("AGREEMENT") is dated as of ____________, 1998,
between Quantum Corporation, a Delaware corporation ("PARENT"), ATL Products,
Inc., a Delaware corporation (the "COMPANY") and the undersigned (the
"AFFILIATE").

     WHEREAS, Parent and the Company have entered into an Agreement and Plan of
Reorganization ("MERGER AGREEMENT") pursuant to which Parent and the Company
intend to enter into a business combination transaction to pursue their long
term business strategies (the "MERGER") (capitalized terms used and not
otherwise defined herein shall have the respective meanings ascribed to them in
the Merger Agreement);

     WHEREAS, pursuant to the Merger, at the Effective Time, all of the issued
and outstanding shares of the Company's Class A Common Stock and Class B Common
Stock (collectively, the "COMPANY COMMON STOCK"), including any shares owned by
Affiliate as of the Effective Time, will be converted into shares of Parent
Common Stock as set forth in the Merger Agreement;

     WHEREAS, Affiliate has been advised that Affiliate may be deemed to be an
"affiliate" of the Company, as the term "affiliate" is used for purposes of
paragraphs (c) and (d) of Rule 145 of the Rules and Regulations of the
Securities and Exchange Commission (the "SEC").

     WHEREAS, the execution and delivery of this Agreement by Affiliate is a
material inducement to Parent to enter into the Merger Agreement.

     NOW, THEREFORE, intending to be legally bound, the parties hereby agree as
follows:

     1.   Acknowledgments by Affiliate.  Affiliate acknowledges and understands
          ----------------------------                                         
that the representations, warranties and covenants by Affiliate set forth herein
will be relied upon by Parent, the Company, and their respective affiliates,
counsel and accounting firms, and that substantial losses and damages may be
incurred by these persons if Affiliate's representations, warranties or
covenants are breached.  Affiliate has carefully read this Agreement and the
Merger Agreement and has had an opportunity to discuss the requirements of this
Agreement with Affiliate's 
<PAGE>
 
professional advisors, who are qualified to advise Affiliate with regard to such
matters.

     2.   Compliance with Rule 145 and the Act.
          ------------------------------------ 

          (a) Affiliate has been advised that (i) the issuance of shares of
Parent Common Stock in connection with the Merger is expected to be effected
pursuant to a Registration Statement on Form S-4 under the Securities Act of
1933, as amended (the "ACT"), and as such will not be deemed "restricted
securities" within the meaning of Rule 144 promulgated thereunder and resale of
such shares will not be subject to any restrictions other than as set forth in
Rule 145 of the Act unless otherwise transferred pursuant to an effective
registration statement under the Act or an appropriate exemption from
registration, (ii) Affiliate may be deemed to be an affiliate of the Company,
and (iii) no sale, transfer or other disposition by Affiliate of any Parent
Common Stock received by Affiliate in the Merger will be registered under the
Act.  Affiliate accordingly agrees not to sell, transfer or otherwise dispose of
any Parent Common Stock issued to Affiliate in the Merger unless (x) such sale,
transfer or other disposition is made in conformity with the requirements of
Rule 145(d) promulgated under the Act, (y) an authorized representative of the
SEC takes the position in writing to the effect that the SEC would take no
action, or that the staff of the SEC would not recommend that the SEC take
action, with respect to such sale, transfer or other disposition, and a copy of
such written position ("NO ACTION CORRESPONDENCE") is delivered to Parent, or
(z) Affiliate delivers to Parent a written opinion of counsel, reasonably
acceptable to Parent in form and substance, that such sale, transfer or other
disposition is otherwise exempt from registration under the Act.

          (b) Parent will give stop transfer instructions to its transfer agent
with respect to any Parent Common Stock received by Affiliate pursuant to the
Merger and there will be placed on the certificates representing such Parent
Common Stock, or any substitutions therefor, a legend stating in substance:

          "THE SHARES REPRESENTED BY THIS CERTIFICATE WERE ISSUED IN A
          TRANSACTION TO WHICH RULE 145 PROMULGATED UNDER THE SECURITIES ACT OF
          1933, AS AMENDED, APPLIES AND MAY ONLY BE TRANSFERRED (A) IN
          CONFORMITY WITH RULE 145(d) UNDER SUCH ACT, (B) IN ACCORDANCE WITH A
          WRITTEN OPINION OF COUNSEL, REASONABLY ACCEPTABLE TO

                                       2
<PAGE>
 
          THE ISSUER IN FORM AND SUBSTANCE THAT SUCH TRANSFER IS EXEMPT FROM
          REGISTRATION UNDER THE SECURITIES ACT OF 1933, AS AMENDED OR (C) AS IS
          OTHERWISE PERMITTED UNDER THAT CERTAIN AFFILIATE AGREEMENT DATED AS OF
          April 22, 1997, A COPY OF WHICH IS ON FILE WITH THE SECRETARY OF THE
          ISSUER."

The legend set forth above shall be removed (by delivery of a substitute
certificate without such legend) and Parent shall instruct its transfer agent to
remove such legend, if Affiliate delivers to Parent (i) satisfactory written
evidence that the shares have been sold in compliance with Rule 145 (in which
case, the substitute certificate will be issued in the name of the transferee),
(ii) a copy of the No Action Correspondence, (iii) an opinion of counsel, in
form and substance reasonably satisfactory to Parent to the effect that public
sale of the shares by the holder thereof is no longer subject to Rule 145, or
(iv) a written request for removal of such legend after the earlier of (x) the
inapplicability of Rule 145 by its terms, (y) the effective date of any action
by the SEC eliminating the restrictions upon sale, transfer or disposition under
Rule 145 or otherwise rendering compliance with such restrictions unnecessary.

     3.   Specific Performance.  Affiliate agrees that irreparable damages would
          --------------------                                                  
occur in the event that any of the provisions of this Agreement were not
performed in accordance with their specific terms, or were otherwise breached.
It is, accordingly, agreed that Parent shall be entitled to injunctive relief to
prevent breaches of the provisions of this Agreement, and to enforce
specifically the terms and provisions hereof, in addition to any other remedy to
which Parent may be entitled at law or in equity.

     4.   Miscellaneous.
          ------------- 

          (a) For the convenience of the parties hereto, this Agreement may be
executed in one or more counterparts, each of which shall be deemed an original,
but all of which together shall constitute one and the same document.

          (b) This Agreement shall be enforceable by, and shall inure to the
benefit of and be binding upon, the parties hereto and their respective
successors and assigns.  As used herein, the term "successors and assigns" shall
mean, where the context so permits, heirs, executors, administrators, trustees
and successor trustees, and personal and other representatives.

                                       3
<PAGE>
 
          (c) This Agreement shall be governed by and construed, interpreted and
enforced in accordance with the internal laws of the State of California
(without regard to the principles of conflict of laws thereof).

          (d) If a court of competent jurisdiction determines that any provision
of this Agreement is not enforceable or enforceable only if limited in time
and/or scope, this Agreement shall continue in full force and effect with such
provision stricken or so limited.

          (e) Counsel to and accountants for the parties to the Agreement shall
be entitled to rely upon this Agreement as needed.

          (f) This Agreement shall not be modified or amended, or any right
hereunder waived or any obligation excused, except by a written agreement signed
by both parties.

          (g) Notwithstanding any other provision contained herein, this
Agreement and all obligations of Affiliate hereunder shall terminate upon the
termination of the Merger Agreement in accordance with its terms.

          (h) Parent currently intends to file on a timely basis, from and after
the Effective Time and as long as is necessary in order to permit Affiliate to
sell Parent Common Stock held by Affiliate pursuant to Rule 145, all reports
required to be filed by it pursuant to the Exchange Act, and currently intends
to otherwise make available adequate information regarding Parent in such manner
as may be required to satisfy the requirements of Rule 144(c) under the Act as
now in effect.

                                       4
<PAGE>
 
     Executed as of the date shown on the first page of this Agreement.

                    QUANTUM CORPORATION


                    By:___________________________________________

                    Name:_________________________________________

                    Title:________________________________________

                    ATL PRODUCTS, INC.

                    By:___________________________________________

                    Name:_________________________________________

                    Title:________________________________________

                    AFFILIATE

                    By:___________________________________________

                    Name of Affiliate:____________________________

                    Name of Signatory (if different from Affiliate):


                    ______________________________________________

                    Title of Signatory
                    (if applicable):______________________________


Number of shares of the Company Common Stock beneficially owned by Affiliate:

_________________________________________ 

Number of shares of the Company Common Stock subject to options beneficially
owned by Affiliate:

_________________________________________ 

                    [Signature Page to Affiliate Agreement]

                                       5

<PAGE>
 
                                                                     EXHIBIT 2.3


                               VOTING AGREEMENT


     This Voting Agreement ("Agreement") is made and entered into as of May 18,
1998, between Quantum Corporation, a Delaware corporation ("Parent"), and the
undersigned stockholder ("Stockholder") of ATL Products, Inc., a Delaware
corporation ("Company").

                                   RECITALS

     A.   Concurrently with the execution of this Agreement, Parent, Company and
Quick Acquisition Corp., a Delaware corporation and a wholly owned subsidiary of
Parent ("Merger Sub"), have entered into an Agreement and Plan of Reorganization
(the "Merger Agreement") which provides for the merger (the "Merger") of Merger
Sub with and into the Company.  Pursuant to the Merger, shares of capital stock
of the Company will be converted into Common Stock of Parent on the basis
described in the Merger Agreement.

     B.   The Stockholder is the record holder and beneficial owner (as defined
in Rule 13d-3 under the Securities Exchange Act of 1934, as amended (the
"Exchange Act")) of such number of shares of the outstanding Class A Common
Stock and Class B Common Stock of the Company (collectively, the "Company Common
Stock") as is indicated on the final page of this Agreement (the "Shares").

     C.   Parent desires the Stockholder to agree, and the Stockholder is
willing to agree, not to transfer or otherwise dispose of any of the Shares, or
any other shares of capital stock of the Company acquired hereafter and prior to
the Expiration Date (as defined in Section 1.1 below, except as otherwise
permitted hereby), and to vote the Shares and any other such shares of capital
stock of the Company so as to facilitate consummation of the Merger.

     NOW, THEREFORE, in consideration of the parties agree as follows:

     1.   Agreement to Retain Shares.
          -------------------------- 

          1.1  Transfer and Encumbrance.  Stockholder agrees not to transfer
               ------------------------                                     
(except as may be specifically required by court order), sell, exchange, pledge
or otherwise dispose of or encumber any of the Shares or any New Shares as
defined in Section 1.2 below, or to make any offer or agreement relating
thereto, at any time 
<PAGE>
 
prior to the Expiration Date. As used herein, the term "Expiration Date" shall
mean the earlier to occur of (i) such date and time as the Merger shall become
effective in accordance with the terms and provisions of the Merger Agreement
and (ii) such date and time as the Merger Agreement shall be terminated pursuant
to Article VII thereof.

          1.2  Additional Purchases.  Stockholder agrees that any shares of
               --------------------                                        
capital stock of the Company that Stockholder purchases or with respect to which
Stockholder otherwise acquires beneficial ownership after the execution of this
Agreement and prior to the Expiration Date ("New Shares") shall be subject to
the terms and conditions of this Agreement to the same extent as if they
constituted Shares.

     2.   Agreement to Vote Shares.  At every meeting of the stockholders of the
          ------------------------                                              
Company called with respect to any of the following, and at every adjournment
thereof, and on every action or approval by written consent of the stockholders
of the Company with respect to any of the following, Stockholder shall vote the
Shares and any New Shares:  (i) in favor of approval of the Merger Agreement and
the Merger and any matter that could reasonably be expected to facilitate the
Merger; and (ii) against approval of any proposal made in opposition to or
competition with consummation of the Merger and against any merger,
consolidation, sale of assets, reorganization or recapitalization, with any
party other than with Parent and its affiliates and against any liquidation or
winding up of the Company (each of the foregoing is hereinafter referred to as
an "Opposing Proposal").  Stockholder agrees not to take any actions contrary to
Stockholder's obligations under this Agreement.

     3.   Irrevocable Proxy.  Concurrently with the execution of this Agreement,
          -----------------                                                     
Stockholder agrees to deliver to Parent a proxy in the form attached hereto as
Exhibit A (the "Proxy"), which shall be irrevocable, with the total number of
shares of capital stock of the Company beneficially owned (as such term is
defined in Rule 13d-3 under the Exchange Act) by Stockholder set forth therein.

     4.   Representations, Warranties and Covenants of the Stockholder.
          ------------------------------------------------------------ 
Stockholder hereby represents, warrants and covenants to Parent as follows:

          4.1  Ownership of Shares.  Stockholder (i) is the beneficial owner of
               -------------------                                             
the Shares, which at the date hereof and at all times up until the Expiration
Date will be free and clear of any liens, claims, options, charges or other
encumbrances; (ii) does not beneficially own any shares of capital stock of the
Company other than the Shares (excluding shares as to which Stockholder
currently disclaims beneficial 

                                      -2-
<PAGE>
 
ownership in accordance with applicable law); and (iii) has full power and
authority to make, enter into and carry out the terms of this Agreement and the
Proxy.

          4.2  No Proxy Solicitations.  Stockholder will not, and will not
               ----------------------                                     
permit any entity under Stockholder's control to:  (i) solicit proxies or become
a "participant" in a "solicitation" (as such terms are defined in Regulation 14A
under the Exchange Act) with respect to an Opposing Proposal or otherwise
encourage or assist any party in taking or planning any action that would
compete with, restrain or otherwise serve to interfere with or inhibit the
timely consummation of the Merger in accordance with the terms of the Merger
Agreement; (ii) initiate a stockholders' vote or action by consent of the
Company stockholders with respect to an Opposing Proposal; or (iii) become a
member of a "group" (as such term is used in Section 13(d) of the Exchange Act)
with respect to any voting securities of the Company with respect to an Opposing
Proposal.

     5.   Additional Documents.  Stockholder hereby covenants and agrees to
          --------------------                                             
execute and deliver any additional documents necessary or desirable, in the
reasonable opinion of Parent or Stockholder, as the case may be, to carry out
the intent of this Agreement.

     6.   Consent and Waiver.  Stockholder hereby gives any consents or waivers
          ------------------                                                   
that are reasonably required for the consummation of the Merger under the terms
of any agreements to which Stockholder is a party or pursuant to any rights
Stockholder may have.

     7.   Termination.  This Agreement and the Proxy delivered in connection
          -----------                                                       
herewith shall terminate and shall have no further force or effect as of the
Expiration Date.

     8.   Miscellaneous.
          ------------- 

          8.1  Severability.  If any term, provision, covenant or restriction of
               ------------                                                     
this Agreement is held by a court of competent jurisdiction to be invalid, void
or unenforceable, then the remainder of the terms, provisions, covenants and
restrictions of this Agreement shall remain in full force and effect and shall
in no way be affected, impaired or invalidated.

          8.2  Binding Effect and Assignment.  This Agreement and all of the
               -----------------------------                                
provisions hereof shall be binding upon and inure to the benefit of the parties
hereto and their respective successors and permitted assigns, but, except as
otherwise 

                                      -3-
<PAGE>
 
specifically provided herein, either this Agreement nor any of the rights,
interests or obligations of the parties hereto may be assigned by either of the
parties without prior written consent of the other.

          8.3  Amendments and Modification.  This Agreement may not be modified,
               ---------------------------                                      
amended, altered or supplemented except upon the execution and delivery of a
written agreement executed by the parties hereto.

          8.4  Specific Performance; Injunctive Relief.  The parties hereto
               ---------------------------------------                     
acknowledge that Parent will be irreparably harmed and that there will be no
adequate remedy at law for a violation of any of the covenants or agreement of
Stockholder set forth herein.  Therefore, it is agreed that, in addition to any
other remedies that may be available to Parent upon any such violation, Parent
shall have the right to enforce such covenants and agreements by specific
performance, injunctive relief or by any other means available to Parent at law
or in equity.

          8.5  Notices.  All notices, requests, claims, demands and other
               -------                                                   
communications hereunder shall be in writing and sufficient if delivered in
person, by cable, telegram or telex, or sent by mail (registered or certified
mail, postage prepaid, return receipt requested) or overnight courier (prepaid)
to the respective parties as follows:

     If to Parent:       Quantum Corporation
                         500 McCarthy Boulevard
                         Milpitas, California  95035
                         Attn:  General Counsel
 
     With a copy to:     Wilson, Sonsini, Goodrich & Rosati
                         650 Page Mill Road
                         Palo Alto, California 94304
                         Attn:  Larry W. Sonsini, Esq.
                                Steven E. Bochner, Esq..

     If to the Stockholder:

     With copies to:     Brobeck, Phleger & Harrison LLP
                         Spear Street Tower
                         One Market
                         San Francisco, California 94105
                         Attention: Steve L. Camahort, Esq.

                                      -4-
<PAGE>
 
               and:

                         Brobeck, Phleger & Harrison LLP
                         38 Technology Drive
                         Irvine, California 92618-2308
                         Attention: Pat Arrington, Esq.

or to such other address as any party may have furnished to the other in writing
in accordance herewith, except that notices of change of address shall only be
effective upon receipt.

     8.6  Governing Law.  This Agreement shall be governed by, and construed and
          -------------                                                         
enforced in accordance with, the internal laws of the State of [California].

     8.7  Entire Agreement.  This Agreement contains the entire understanding of
          ----------------                                                      
the parties in respect of the subject matter hereof, and supersedes all prior
negotiations and understandings between the parties with respect to such subject
matter.

     8.8  Counterparts.  This Agreement may be executed in several counterparts,
          ------------                                                          
each of which shall be an original, but all of which together shall constitute
one and the same agreement.

     8.9  Effect of Headings.  The section headings herein are for convenience
          ------------------                                                  
only and shall not affect the construction of interpretation of this Agreement.

     8.10 Obligations of Stockholder.  Stockholder makes no agreement or
          --------------------------                                    
understanding herein in his or her capacity as a director or officer of Company,
and nothing herein will limit or affect any actions taken by Stockholder in his
or her capacity as an officer or director of Company in exercising its rights
under the Merger Agreement.

                                      -5-
<PAGE>
 
     IN WITNESS WHEREOF, the parties have caused this Voting Agreement to be
duly executed on the date and year first above written.

                                QUANTUM CORPORATION

                                By: /s/ Michael A. Brown
                                    __________________________________

                                Title: CEO
                                       _______________________________


                                STOCKHOLDER:

                                By: /s/ Kevin C. Daly
                                    __________________________________
                                    Kevin Daly

                                Stockholder's Address for Notice:



                                Shares beneficially owned:

                                ___________________ shares of Class A
                                Common Stock and

                                ___________________ shares of Class B
                                Common Stock



                     [Signature Page to Voting Agreement]

                                      -6-
<PAGE>
 
                                   EXHIBIT A

                               IRREVOCABLE PROXY


     The undersigned stockholder of ATL Products, Inc., a Delaware corporation
("Company"), hereby irrevocably appoints the directors on the Board of Directors
of Quantum Corporation, a Delaware corporation ("Parent"), and each of them, as
the sole and exclusive attorneys and proxies of the undersigned, with full power
of substitution and resubstitution, to the full extent of the undersigned's
rights with respect to the shares of capital stock of the Company beneficially
owned by the undersigned, which shares are listed on the final page of this
Proxy (the "Shares"), and any and all other shares or securities issued or
issuable in respect thereof on or after the date hereof, until such time as that
certain Agreement of Merger and Plan of Reorganization dated as of May 18, 1998
(the "Merger Agreement"), among Parent, Quick Acquisition Corp., a Delaware
corporation and a wholly-owned subsidiary of Parent ("Merger Sub"), and Company,
shall be terminated in accordance with its terms or the Merger (as defined in
the Merger Agreement) is effective.  Upon the execution hereof, all prior
proxies given by the undersigned with respect to the Shares and any and all
other shares or securities issued or issuable in respect thereof on or after the
date hereof are hereby revoked and no subsequent proxies will be given.

     This proxy is irrevocable, is granted pursuant to the Voting Agreement
dated as of May 18, 1998 between Parent and the undersigned stockholder (the
"Voting Agreement"), and is granted in consideration of Parent entering into the
Merger Agreement.  The attorneys and proxies named above will be empowered at
any time prior to termination of the Merger Agreement to exercise all voting and
other rights (including, without limitation, the power to execute and deliver
written consents with respect to the Shares) of the undersigned at every annual,
special or adjourned meeting of Company stockholders, and in every written
consent in lieu of such a meeting, or otherwise, in favor of approval of the
Merger and the Merger Agreement and any matter that could reasonably be expected
to facilitate the Merger, and against any proposal made in opposition to or
competition with the consummation of the Merger and against any merger,
consolidation, sale of assets, reorganization or recapitalization of the Company
with any party other than Parent and its affiliates and against any liquidation
or winding up of the Company.

     The attorneys and proxies named above may only exercise this proxy to vote
the Shares subject hereto at any time prior to termination of the Merger
Agreement at every annual, special or adjourned meeting of the stockholders of
Company and in every written consent in lieu of such meeting, in favor of
approval of the Merger and the Merger Agreement and any matter that could
reasonably be expected to facilitate the Merger, and against any merger,
consolidation, sale of assets, reorganization or recapitalization of Company
with any party other than Parent and its affiliates, and 

                                      -7-
<PAGE>
 
against any liquidation or winding up of the Company, and may not exercise this
proxy on any other matter. The undersigned stockholder may vote the Shares on
all other matters.

     Any obligation of the undersigned hereunder shall be binding upon the
successors and assigns of the undersigned.

     This proxy is irrevocable.

Dated:  May 18, 1998

                                  /s/ Kevin C. Daly
        Signature of Stockholder:_________________________________________

                                      Kevin C. Daly
        Print Name of Stockholder:________________________________________

        Shares beneficially owned:

        ______________ shares of Class A Common Stock

        ______________ shares of Class B Common Stock
        


                      



                           [Signature Page to Proxy]

                                      -8-

<PAGE>
 
                                                                     EXHIBIT 2.4


                           NONCOMPETITION AGREEMENT


     This NONCOMPETITION AGREEMENT (this "AGREEMENT") is made as of ___________,
1998 by and among Quantum Corporation, a Delaware corporation ("PARENT"), ATL
Products, Inc., a Delaware corporation ("COMPANY"), and __________________  (the
"STOCKHOLDER").

                                   RECITALS

     A.   As an employee, executive and stockholder of Company, the Stockholder
has obtained extensive and valuable knowledge and information concerning the
business of Company (including confidential information relating to Company and
its operations, assets, contracts, customers, personnel, plans and prospects).

     B.   Concurrently with the execution and delivery of this Agreement, Parent
is acquiring Company through a merger (the "MERGER") of Quick Acquisition
Corporation, a Delaware corporation and wholly owned subsidiary of Parent, with
and into Company, pursuant to an Agreement and Plan of Reorganization dated May
18, 1998 (the "MERGER AGREEMENT").  The Merger Agreement requires that a
noncompetition agreement be executed and delivered by the Stockholder as a
condition to the completion of the Merger, and the Stockholder is entering into
this Agreement in order to induce Parent to complete the Merger.

                                   AGREEMENT

     The parties, intending to be legally bound, agree as follows:

     1.   Definitions.  Capitalized terms used but not expressly defined in this
          -----------                                                           
Agreement shall have the meanings ascribed to them in the Merger Agreement.

     2.   Acknowledgments by the Stockholder.  The Stockholder acknowledges that
          ----------------------------------                                    
(a) the Stockholder has occupied a position of trust and confidence with Company
prior to the date hereof and has become familiar with the following, any and all
of which may constitute confidential information of Company (any such
information constituting confidential information of Company, the "CONFIDENTIAL
INFORMATION"): (i) any and all trade secrets concerning the business and affairs
of Company, data, know-how, compositions, processes, customer lists, current and
anticipated customer requirements, price lists, market studies, business plans;
(ii) any and all information concerning the business and affairs of Company
(which includes historical financial statements, financial projections and
budgets, historical and projected sales, capital spending budgets and plans, the
names and backgrounds of key personnel, personnel training and techniques and
materials), however documented; and (iii) any and all notes, analysis,
compilations, studies, summaries, and 
<PAGE>
 
other material prepared by or for Company containing or based, in whole or in
part, on any information included in the foregoing, (b) Parent has required that
the Stockholder make the covenants set forth in this Agreement as a condition to
Parent's acquisition of the Company; (c) the provisions of this Agreement are
reasonable and necessary to protect and preserve Company's business, and (d)
Company would be irreparably damaged if the Stockholder were to breach the
covenants set forth in Sections 3, 4, 5, 6 and 7 of this Agreement.

     3.   Confidential Information.  The Stockholder acknowledges and agrees
          ------------------------                                          
that all Confidential Information known or obtained by the Stockholder, whether
before or after the date hereof, is the property of Parent.  Therefore, the
Stockholder agrees that the Stockholder will not, at any time, disclose to any
unauthorized Persons or use for his own account or for the benefit of any third
party any Confidential Information, whether the Stockholder has such information
in the Stockholder's memory or embodied in writing or other physical form,
without Parent's written consent, unless and to the extent that the Confidential
Information (i) is or becomes generally known to and available for use by the
public other than as a result of the Stockholder's fault or the fault of any
other Person bound by a duty of confidentiality to Parent or Company or (ii)
becomes available to Stockholder on a nonconfidential basis from a person other
than Company or Parent who is not otherwise bound by a confidentiality agreement
with Company or Parent, or is otherwise not under an obligation to Company or
Parent not to transmit the information to Stockholder.  The Stockholder agrees
to deliver to Parent, at any time Parent may request, all documents, memoranda,
notes, plans, records, reports, and other documentation, models, components, or
computer software, whether embodied in a disk or in other form (and all copies
of all of the foregoing), relating to the businesses, operations, or affairs of
Company and any other Confidential Information that the Stockholder may then
possess or have under the Stockholder's control.

     4.   Noncompetition.  As an inducement for Parent to enter into the Merger
          --------------                                                       
Agreement and as additional consideration for the consideration to be paid under
the Merger Agreement (part of which will be distributed to the Stockholder), the
Stockholder agrees that during the Noncompetition Period (as hereinafter
defined), the Stockholder will not, directly or indirectly, engage or invest in,
own, manage, operate, finance, control, or participate in the ownership,
management, operation, financing, or control of, be employed by, associated
with, or in any manner connected with, lend the Stockholder's name or any
similar name to, lend the Stockholder's credit to, or render services or advice
to, any business whose products, product development, services or other
activities compete in any respect with the products, product development,
services or other activities of or offered by Company, as such existed at or
before the Closing Date (the "RESTRICTED BUSINESS"), in North America; provided,
however, that the Stockholder may purchase or otherwise acquire up to (but not
more than) three percent (3%) of any class of securities of any enterprise (but
without otherwise participating in the activities of such enterprise) if such
securities are listed on any national or regional securities exchange or have
been registered under Section 12(g) of the Securities Exchange Act of 1934, as
amended.  The Stockholder agrees that this covenant is reasonable with respect
to its duration, geographical area, and scope.  As used herein, the
"NONCOMPETITION PERIOD" shall commence upon the Closing Date and end upon the
earlier of (i) 12 months following the 

                                      -2-
<PAGE>
 
termination of Stockholder's employment with the Company or Parent or (ii) the
third anniversary of the Closing Date. Notwithstanding the foregoing, in the
event that Stockholder's employment with Parent or Company is terminated by
Parent or Company other than for Cause (as defined below), the Noncompetition
Period shall end six months following the termination of Stockholder's
employment with the Company or Parent. For purposes of this Agreement, "CAUSE"
shall mean termination by the Company or Parent (i) because of the Stockholder's
commission of a felony involving moral turpitude, (ii) the willful, unauthorized
disclosure of the Company's or Parent's trade secrets, or (iii) following
delivery to Stockholder of a written demand for performance from Company or
Parent which describes the basis for Company's or Parent's belief that
Stockholder has not substantially performed his duties, continued violations by
Stockholder of Stockholder's obligations to Company or Parent which are
demonstrably willful and deliberate on Stockholder's part.

     5.   Nonsolicitation.  The Stockholder further agrees that during the
          ---------------                                                 
Noncompetition Period, he will not directly or indirectly, personally or through
others, encourage, induce, attempt to induce, solicit or attempt to solicit (on
the Stockholder's own behalf or on behalf of any other person or entity) any
employee of Parent or Company to leave his or her employment with such firm;
                                                                            
provided, however, that the foregoing shall not prohibit general solicitations
- --------  -------                                                             
by means of newspaper advertisements, web site postings and the like.

     6.   Independence of Obligations.  The covenants of the Stockholder set
          ---------------------------                                       
forth in this Agreement shall be construed as independent of any other agreement
or arrangement between the Stockholder, on the one hand, and Parent or Company,
on the other.  The existence of any claim or  cause of action by the Stockholder
against Parent or Company shall not constitute a defense to the enforcement of
such covenants against the Stockholder.

     7.   Remedies.  If the Stockholder breaches the covenants set forth in this
          --------                                                              
Agreement, each of Parent and Company will be entitled to the following
remedies:

          a.   damages from the Stockholder; and

          b.   in addition to its right to damages and any other rights it may
have, to obtain injunctive or other equitable relief to restrain any breach or
threatened breach or otherwise to specifically enforce any provision of this
Agreement, it being agreed that money damages alone would be inadequate to
compensate the Parent or Company and would be an inadequate remedy for such
breach.

     8.   Non-Exclusivity.  The rights and remedies of Parent and Company
          ---------------                                                
hereunder are not exclusive of or limited by any other rights or remedies which
Parent or Company may have, whether at law, in equity, by contract or otherwise,
all of which shall be cumulative (and not alternative). Without limiting the
generality of the foregoing, the rights and remedies of Parent and Company,
hereunder, and the obligations and liabilities of the Stockholder hereunder, are
in addition to their 

                                      -3-
<PAGE>
 
respective rights, remedies, obligations and liabilities under the law of unfair
competition, misappropriation of trade secrets and the like.

     9.   Waiver.  The rights and remedies of the parties to this Agreement are
          ------                                                               
cumulative and not alternative.  Neither the failure nor any delay by any party
in exercising any right, power, or privilege under this Agreement will operate
as a waiver of such right, power, or privilege, and no single or partial
exercise of any such right, power, or privilege will preclude any other or
further exercise of such right, power, or privilege or the exercise of any other
right, power, or privilege.  To the maximum extent permitted by applicable law,
(a) no claim or right arising out of this Agreement can be discharged by one
party, in whole or in part, by a waiver or renunciation of the claim or right
unless in writing signed by the other party; (b) no waiver that may be given by
a party will be applicable except in the specific instance for which it is
given; and (c) no notice to or demand on one party will be deemed to be a waiver
of any obligation of such party or of the right of the party giving such notice
or demand to take further action without notice or demand as provided in this
Agreement.

     10.  Governing Law.  This Agreement will be governed by the laws of the
          -------------                                                     
State of California without regard to conflicts of laws principles.

     11.  Severability.  If any provision of this Agreement or any part of any
          ------------                                                        
such provision is held under any circumstances to be invalid or unenforceable in
any jurisdiction, then (a) such provision or part thereof shall, with respect to
such circumstances and in such jurisdiction, be deemed amended to conform to
applicable laws so as to be valid and enforceable to the fullest possible
extent, (b) the invalidity or unenforceability of such provision or part thereof
under such circumstances and in such jurisdiction shall not affect the validity
or enforceability of such provision or part thereof under any other
circumstances or in any other jurisdiction, and (c) such invalidity of
enforceability of such provision or part thereof shall not affect the validity
or enforceability of the remainder of such provision or the validity or
enforceability of any other provision of this Agreement.  Each provision of this
Agreement is separable from every other provision of this Agreement, and each
part of each provision of this Agreement is separable from every other part of
such provision.

     12.  Counterparts.  This Agreement may be executed in one or more
          ------------                                                
counterparts, each of which will be deemed to be an original copy of this
Agreement and all of which, when taken together, will be deemed to constitute
one and the same agreement.

     13.  Section Headings, Construction.  The headings of Sections in this
          ------------------------------                                   
Agreement are provided for convenience only and will not affect its construction
or interpretation.  All references to "Section" or "Sections" refer to the
corresponding Section or Sections of this Agreement unless otherwise specified.
All words used in this Agreement will be construed to be of such gender or
number as the circumstances require.  Unless otherwise expressly provided, the
word "including" does not limit the preceding words or terms.

                                      -4-
<PAGE>
 
     14.  Notices.  All notices, consents, waivers, and other communications
          -------                                                           
under this Agreement must be in writing and will be deemed to have been duly
given when (a) delivered by hand, (b) sent by facsimile, provided that a copy is
mailed by registered mail, return receipt requested, or (c) when received by the
addressee, if sent by a nationally recognized overnight delivery service or
registered mail (receipt requested), in each case to the appropriate addresses
and facsimile numbers set forth below (or to such other addresses and facsimile
numbers as a party may designate by notice to the other parties):

Stockholder:   At Stockholder's address set forth on the signature page hereof.

Parent:        Quantum Corporation
               500 McCarthy Boulevard
               Milpitas, California 95035
               Attn:  General Counsel

     15.  Further Assurances.  The Stockholder shall execute and/or cause to be
          ------------------                                                   
delivered to Parent or Company such instruments and other documents and shall
take such other actions as Parent or Company may reasonably request to
effectuate the intent and purposes of this Agreement.

     16.  Assignment.  This Agreement and all obligations hereunder are personal
          ----------                                                            
to the Stockholder and may not be transferred or assigned by the Stockholder at
any time.  Each of Parent and Company may assign its respective rights under
this Agreement to any entity in connection with any sale or transfer of all or a
substantial portion of its respective assets to such entity.

     17.  Binding Nature.  Subject to Section 17, this Agreement will be binding
          --------------                                                        
upon the Stockholder and the Stockholder's representatives, executors,
administrators, estate, heirs, successors and assigns, and will inure to the
benefit of Parent and Company and their respective successors and assigns.

     18.  Entire Agreement.  This Agreement constitutes the entire agreement
          ----------------                                                  
between the parties with respect to the subject matter of this Agreement and
supersedes all prior written and oral agreements and understandings among
Parent, Company and the Stockholder with respect to the subject matter of this
Agreement.  This Agreement may not be amended except by a written agreement
executed by all parties hereto.

                                      -5-
<PAGE>
 
     IN WITNESS WHEREOF, the parties have executed and delivered this Agreement
as of the date first above written.

QUANTUM CORPORATION:                    STOCKHOLDER:


By:_______________________________      By:_____________________________

Name:_____________________________

Title:____________________________

ATL PRODUCTS, INC.


By:_______________________________

Name:_____________________________

Title:____________________________



                 [Signature Page to Noncompetition Agreement]

<PAGE>
 
                                August 18, 1998
 
Quantum Corporation
500 McCarthy Boulevard
Milpitas, California 95035
 
  RE: REGISTRATION STATEMENT ON FORM S-4
 
Gentlemen:
 
  We have examined the Registration Statement on Form S-4 to be filed by you
with the Securities and Exchange Commission on or about August 18, 1998 (the
"Registration Statement") in connection with the registration under the
Securities Act of 1933, as amended, of 18,000,000 shares of your Common Stock
(the "Shares"). As your counsel in connection with this transaction, we have
examined the proceedings taken and are familiar with the proceedings proposed
to be taken by you in connection with the issuance and sale of the Shares
pursuant to the acquisition transaction set forth in the Registration
Statement.
 
  It is our opinion that, when issued and sold in the manner described in the
Registration Statement, the Shares will be legally and validly issued, fully-
paid and non-assessable.
 
  We consent to the use of this opinion as an exhibit to the Registration
Statement, and further consent to the use of our name wherever appearing in
the Registration Statement and any amendments thereto.
 
                                          Very truly yours,
 
                                          Wilson Sonsini Goodrich & Rosati,
                                          Professional Corporation
 
                                          /s/ Wilson Sonsini Goodrich & Rosati

<PAGE>

                                                                   Exhibit 8.1

              [LETTERHEAD OF WILSON SONSINI GOODRICH & ROSATI]
 
                               August 18, 1998

Quantum Corporation
500 McCarthy Boulevard
Milpitas, California 95035


Ladies and Gentlemen:

        This opinion is being delivered to you in connection with the Form S-4
Registration Statement filed with the Securities and Exchange Commission 
(which contains a prospectus and joint proxy statement) (the "Registration 
Statement") filed pursuant to the Agreement and Plan of Reorganization (the 
"Reorganization Agreement"), dated May 18, 1998, among Quantum Corporation, a 
Delaware corporation ("Quantum"), Quick Acquisition Corporation, a Delaware 
corporation and a wholly-owned subsidiary of Quantum ("Merger Sub"), and ATL 
Products, Inc., a Delaware corporation ("ATL").

        Except as otherwise provided, capitalized terms used but not defined 
herein shall have the meanings set forth in the Reorganization Agreement. All 
section references, unless otherwise indicated, are to the Internal Revenue 
Code of 1986, as amended (the "Code").

        We have acted as counsel to Quantum and Merger Sub in connection with 
the Merger. As such, and for the purpose of rendering this opinion, we have 
examined, and are relying upon (without any independent investigation or 
review thereof) the truth and accuracy, at all relevant times, of the 
statements, covenants, representations and warranties contained in the 
following documents (including all exhibits and schedules attached thereto):

        1.      the Reorganization Agreement;

        2.      the Registration Statement;

        3.      those certain tax representation letters delivered to us by
                Quantum, Merger Sub and ATL containing certain representations
                of Quantum, Merger Sub and ATL (the "Tax Representation
                Letters"); and

        4.      such other instruments and documents related to the formation,
                organization and operation of Quantum, Merger Sub and ATL and
                related to the consummation of the Merger and the other
                transactions contemplated by the Reorganization Agreement as
                we have deemed necessary or appropriate.
<PAGE>
 
Quantum Corporation
August 18, 1998
Page 2


        In connection with rendering this opinion, we have assumed (without 
any independent investigation or review thereof) that:

        1.      Original documents submitted to us (including signatures
                thereto) are authentic, documents submitted to us as copies
                conform to the original documents, and that all such documents
                have been (or will be by the Effective Time) duly and validly
                executed and delivered where due execution and delivery are a
                prerequisite to the effectiveness thereof;

        2.      All representations, warranties and statements made or agreed
                to by Quantum, Merger Sub and ATL, their managements,
                employees, officers, directors and shareholders in connection
                with the Merger, including, but not limited to, those set
                forth in the Reorganization Agreement (including the exhibits
                thereto) and the Tax Representation Letters are true and
                accurate at all relevant times;

        3.      All covenants contained in the Reorganization Agreement
                (including exhibits thereto) and the Tax Representation Letters
                are performed without waiver or breach of any material
                provision thereof;

        4.      Quantum will not redeem, subsequent to and in connection with
                the Merger, an amount of its stock having a value greater
                than 15%, in the aggregate, of the Quantum Common Stock issued
                in the Merger;

        5.      The Merger will be reported by Quantum and ATL on their
                respective federal income tax returns in a manner consistent
                with the opinion set forth below; and

        6.      Any representation or statement made "to the best of
                knowledge" or similarly qualified is correct without such
                qualification.

        Based on our examination of the foregoing items and subject to the 
limitations, qualifications, assumptions and caveats set forth herein, we are 
of the opinion that, if the Merger is consummated in accordance with the 
Reorganization Agreement (and without any waiver, breach or amendment of any 
of the provisions thereof) and the statements set forth in the Tax 
Representation Letters are true and correct as of the Effective Time, then for
federal income tax purposes, the Merger will be a reorganization within the 
meaning of Section 368(a) of the Code.

        We consent to the reference to our firm under the caption "Certain 
Federal Income Tax Considerations" in the Proxy Statement included in the 
Registration Statement and to the filing of this opinion as an exhibit to the 
Proxy Statement and to the Registration Statement.

        This opinion does not address the various state, local or foreign tax
consequences that may result from the Merger or the other transactions
contemplated by the Reorganization Agreement.
<PAGE>
 
Quantum Corporation
August 18, 1998
Page 3


In addition, no opinion is expressed as to any federal income tax consequence of
the Merger or the other transactions contemplated by the Reorganization 
Agreement except as specifically set forth herein, and this opinion may not be 
relied upon except with respect to the consequences specifically discussed 
herein.

        No opinion is expressed (i) as to any transaction other than the
Merger as described in the Reorganization Agreement, including the transaction
by which ATL stock was distributed by Odetics, Inc., a Delaware corporation,
to its shareholders, or (ii) as to any other transaction whatsoever, including
the Merger, if all of the transactions described in the Reorganization
Agreement are not consummated in accordance with the terms of the
Reorganization Agreement and without waiver of any material provision thereof.
To the extent that any of the representations, warranties, covenants,
statements and assumptions material to owe opinion and upon which we have
relied are not accurate and complete in all material respects at all relevant
times, our opinion would be adversely affected and should not be relied upon.

        This opinion only represents our best judgement as to the federal income
tax consequences of the Merger and is not binding on the Internal Revenue 
Service or any court of law, tribunal, administrative agency or other 
governmental body. The conclusions are based on the Code, existing judicial 
decisions, administrative regulations and published rulings. No assurance can be
given that future legislative, judicial or administrative changes or 
interpretations would not adversely affect the accuracy of the conclusions 
stated herein. Nevertheless, by rendering this opinion, we undertake no 
responsibility to advise you of any new developments in the application or 
interpretation of the federal income tax laws.

        This opinion is being delivered solely in connection with the 
Registration Statement. It is intended for the benefit of Quantum and Merger Sub
and may no be relied upon or utilized for any other purpose or by any other 
person and may not be made available to any other person without our prior 
written consent.

                                       Very truly yours,

                                       WILSON SONSINI GOODRICH & ROSATI
                                        Professional Corporation

                                       /s/ WILSON SONSINI GOODRICH & ROSATI


<PAGE>
 
                                                                     EXHIBIT 8.2

                [LETTERHEAD OF BROBECK, PHLEGER & HARRISON LLP]


                               August 18, 1998



ATL Products, Inc.
2801 Kelvin Avenue
Irvine, California 92614

Ladies and Gentlemen:

          This opinion is being delivered to you in connection with the
Registration Statement on Form S-4 (the "Registration Statement") filed with
the Securities and Exchange Commission relating to the Agreement and Plan of
Reorganization (the "Agreement") dated May 18, 1998, among Quantum
Corporation, a Delaware corporation ("Quantum"), Quick Acquisition
Corporation, a Delaware corporation ("Sub"), and ATL Products, Inc., a
Delaware corporation ("ATL"). Pursuant to the Agreement, Sub will merge with
and into ATL (the "Merger"), and ATL will become a wholly owned subsidiary of
Quantum.

          Except as otherwise provided, capitalized terms referred to herein
have the meanings set forth in the Agreement.  All section references, unless
otherwise indicated, are to the Internal Revenue Code of 1986, as amended (the
"Code").

          We have acted as legal counsel to ATL in connection with the Merger.
As such, and for the purpose of rendering this opinion, we have examined and are
relying upon (without any independent investigation or review thereof) the truth
and accuracy, at all relevant times, of the statements, covenants,
representations and warranties contained in the following documents (including
all schedules and exhibits thereto):

          1.  The Agreement;

          2.  Representations made to us in a letter by Quantum and Sub;

          3.  Representations made to us in a letter by ATL;

          4.  The Registration Statement; and

<PAGE>
 
ATL Products, Inc.                                               August 18, 1998
                                                                          Page 2

          5.  Such other instruments and documents related to the formation,
organization and operation of Quantum, ATL and Sub and to the consummation of
the Merger and the other transactions contemplated by the Agreement as we have
deemed necessary or appropriate.

          In connection with rendering this opinion, we have assumed or obtained
representations (and are relying thereon, without any independent investigation
or review thereof) that:

          A.  Original documents submitted to us (including signatures) are
authentic, documents submitted to us as copies conform to the original
documents, and there has been (or will be by the Effective Time) due execution
and delivery of all documents where due execution and delivery are prerequisites
to the effectiveness thereof;

          B.  All representations made to us are true and correct as of the date
of this letter and will be true and correct as of the Effective Time (and
thereafter to the extent related to periods after the Merger).  All
representations or statements made "to the best knowledge" of a person or
similarly qualified are and will be correct without such qualification;

          C.  The Merger will be consummated in accordance with the Agreement
without any waiver or breach of any material provision thereof, and the Merger
will be effective under the laws of the State of Delaware;

          D.  Quantum will not redeem, subsequent to and in connection with 
the Merger, an amount of its stock having a value greater than 15%, in the 
aggregate, of the Quantum Common Stock issued in the Merger; and

          E.  The Merger will be reported by Quantum and ATL on their respective
federal income tax returns in a manner consistent with the opinion set forth
below.

          Based on our examination of the foregoing items and subject to the
assumptions, exceptions, limitations and qualifications set forth herein, we are
of the opinion that the Merger will constitute a "reorganization" within the
meaning of Section 368(a) of the Code for federal income tax purposes.

          In addition to the assumptions and representations set forth above,
this opinion is subject to the exceptions, limitations and qualifications set
forth below.

          a.  This opinion represents and is based upon our best judgment
<PAGE>
 
ATL Products, Inc.                                               August 18, 1998
                                                                          Page 3

regarding the application of federal income tax laws arising under the Code,
existing judicial decisions, administrative regulations and published rulings
and procedures.  Our opinion is not binding upon the Internal Revenue Service or
the courts, and there is no assurance that the Internal Revenue Service will not
successfully assert a contrary position.  Furthermore, no assurance can be
given that future legislative, judicial or administrative changes, on either a
prospective or retroactive basis, will not adversely affect the accuracy of the
conclusions stated herein.  Nevertheless, we undertake no responsibility to
advise you of any new developments in the application or interpretation of the
federal income tax laws.

          b. This opinion addresses only the classification of the Merger as a
reorganization under Section 368(a) of the Code. This opinion does not address
any other federal, state, local or foreign tax consequences that may result
from the Merger or any other transaction (including any transaction undertaken
in connection with the Merger). In particular, we express no opinion regarding
(i) whether and the extent to which any ATL stockholder who has provided or
will provide services to ATL, Quantum or Sub will have compensation income
under any provision of the Code; (ii) the effects of such compensation income,
including but not limited to the effect upon the basis and holding period of
the Quantum Common Stock received by any such stockholder in the Merger; (iii)
the potential application of the "golden parachute" provisions (Sections 280G,
3121(v)(2) and 4999) of the Code, the alternative minimum tax provisions
(Sections 56 and 57) of the Code or Sections 305, 306, 357, 424, and 708, or
the regu lations promulgated thereunder; (iv) other than that the Merger will
be a reorganization within the meaning of Section 368(a) of the Code and the
consequences that follow directly and solely from such characterization, the
corporate level tax consequences of the Merger to Quantum, Sub or ATL,
including without limitation the survival and/or availability, after the
Merger, of any of the federal income tax attributes or elections of ATL,
application of any provision of the Code, as well as the regulations promulgated
thereunder and judicial interpretations thereof; (v) the basis of any equity
interest in ATL acquired by Quantum in the Merger; (vi) the tax consequences of
any transaction in which ATL stock or a right to acquire ATL stock was received,
including the 1997 distribution of the stock of ATL by Odetics, Inc., or the
effect of the Merger upon such tax consequences; or (vii) the tax consequences
of the Merger to holders of options or warrants to purchase ATL stock.

          c.  No opinion is expressed as to any transaction other than the
Merger as described in the Agreement or as to any transaction whatsoever,
including the Merger, if all the transactions described in the Agreement are not
consummated in accordance with the terms of such Agreement and without waiver or
breach of any material provision thereof or if all of the representations,
warranties, statements and assumptions upon which we relied are not true and
accurate at all relevant times. In
<PAGE>
 
ATL Products, Inc.                                               August 18, 1998
                                                                          Page 4

the event any one of the statements, representations, warranties or assumptions
upon which we have relied to issue this opinion is incorrect, our opinion might
be adversely affected and may not be relied upon.

          d. This opinion has been delivered to you solely in connection with
the Registration Statement. It is intended solely for your benefit and may not
be relied upon for any other purpose or by any other person or entity and may
not be made available to any other person or entity without our prior written
consent. We hereby consent to the filing of this opinion as an exhibit to the
Registration Statement and further consent to the use of our name wherever
appearing in such Registration Statement and any amendment thereto.

                               Very truly yours,

                               /s/ Brobeck, Phleger & Harrison LLP

                               BROBECK, PHLEGER & HARRISON LLP

<PAGE>
 
                                                                   EXHIBIT 23.3
 
              CONSENT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS
 
  We consent to the reference to our firm under the caption "Experts" and to
the use of our report dated April 28, 1998 included in the Proxy Statement of
ATL Products, Inc. that is made a part of the Registration Statement (Form S-
4) and Prospectus of Quantum Corporation for the registration of 18,000,000
shares of its common stock. We also consent to the incorporation by reference
therein of our report dated April 21, 1998 with respect to the consolidated
financial statements and schedule of Quantum Corporation included in its
Annual Report (Form 10-K) for the year ended March 31, 1998, filed with the
Securities and Exchange Commission.
 
                                          /s/ Ernst & Young LLP
 
Palo Alto, California
August 14, 1998

<PAGE>
 
                                                                   EXHIBIT 23.4
 
                       INDEPENDENT ACCOUNTANTS' CONSENT
 
The Board of Directors
MKE Quantum Components LLC:
 
  We consent to the incorporation by reference in the registration statement
on Form S-4 of Quantum Corporation of our report dated April 14, 1998, except
for notes 6(b) and 12, which are as of June 5, 1998, with respect to the
consolidated balance sheet of MKE Quantum Components LLC and subsidiaries as
of March 31, 1998, and the related consolidated statements of operations,
members' equity, and cash flows for the period from May 16, 1997 (Inception)
through March 31, 1998, which report appears in the annual report on Form 10-K
of Quantum Corporation dated June 26, 1998.
 
                                          /s/ KPMG Peat Marwick LLP
Boston, Massachusetts
August 13, 1998

<PAGE>
 
                                                                   EXHIBIT 23.5
 
              CONSENT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS
 
  We consent to the reference to our firm under the caption "Experts" and to
the use of our report dated April 28, 1998, included in the Proxy Statement of
ATL Products, Inc. that is made a part of the Registration Statement (Form S-
4) and Prospectus of Quantum Corporation for the registration of 18,000,000
shares of its common stock to be filed with the Securities and Exchange
Commission on or about August 17, 1998.
 
                                          /s/ Ernst & Young LLP
 
Orange County, California
August 12, 1998

<PAGE>

                                                                    EXHIBIT 99.1

 
PROXY

                              ATL PRODUCTS, INC.
                             CLASS A COMMON STOCK
                             CLASS B COMMON STOCK

          THIS PROXY IS SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS

     The undersigned stockholder of Class A Common Stock of ATL PRODUCTS, INC. 
("ATL") hereby appoints KEVIN C. DALY, Ph.D and JAMES A. PIPP, and each of them,
proxies of the undersigned, each with full power to act without the other and
with power of substitution, to represent the undersigned at the Special Meeting
of the Stockholders of ATL to be held at the Hyatt Regency Irvine located at
17900 Jamboree Road, Irvine, California on September 24, 1998 at 2:00 p.m.
(Pacific Time), and at any adjournments thereof, and to vote all shares of Class
A Common Stock of ATL held of record by the undersigned on August 10, 1998, with
all the powers the undersigned would possess if personally present, in
accordance with the instructions on the reverse hereof.

     The undersigned hereby revokes any other proxy to vote at such Special 
Meeting of Stockholders and hereby ratifies and confirms all that said proxies, 
and each of them, may lawfully do by virtue hereof. The undersigned also 
acknowledges receipt of the Notice of Special Meeting of Stockholders to be held
on September 24, 1998 and the Proxy Statement/Prospectus dated August 18, 1998 
furnished herewith.

                  CONTINUED AND TO BE SIGNED ON REVERSE SIDE
                               SEE REVERSE SIDE

<PAGE>
 
[x] Please mark votes as in this example.

     THIS PROXY, WHEN PROPERLY EXECUTED, WILL BE VOTED IN ACCORDANCE WITH THE 
INSTRUCTIONS BELOW, OR IF NO INSTRUCTIONS ARE INDICATED, THIS PROXY WILL BE 
VOTED FOR PROPOSAL 1 AND AS THE NAMED PROXIES CONSIDER ADVISABLE IN THEIR 
JUDGMENT WITH REGARD TO ANY OTHER MATTERS PROPERLY BROUGHT TO A VOTE AT THE
SPECIAL MEETING OR ANY ADJOURNMENT OR POSTPONEMENT THEREOF.

     1. Approval of the Merger and the Merger Agreement.

        FOR [_]       AGAINST [_]       ABSTAIN [_]

     MARK HERE FOR ADDRESS CHANGE AND NOTE AT LEFT           [_]
     MARK HERE IF YOU PLAN TO ATTEND THE MEETING             [_]

(This proxy must be signed exactly as your name appears hereon. Executors,
administrators, trustees, etc., should give full title as such. If the
stockholder is a corporation, a duly authorized officer should sign on behalf of
the corporation and should indicate his or her title.)

PLEASE MARK, SIGN, DATE AND RETURN THIS PROXY CARD PROMPTLY USING THE ENCLOSED
ENVELOPE.



Signature:                             Date:
           ------------------------          --------------------

Signature:                             Date:
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