ADAPTEC INC
10-K, 1999-06-29
COMPUTER COMMUNICATIONS EQUIPMENT
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                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                            ------------------------

                                   FORM 10-K
                            ------------------------
(MARK ONE)

      [X]   ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
        SECURITIES EXCHANGE ACT OF 1934.

                    FOR THE FISCAL YEAR ENDED MARCH 31, 1999

                                       OR

      [ ]   TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
        SECURITIES EXCHANGE ACT OF 1934.

           FOR THE TRANSITION PERIOD FROM __________ TO __________ .

                        COMMISSION FILE NUMBER 000-15071

                                 ADAPTEC, INC.
             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)

<TABLE>
<S>                                            <C>
                   DELAWARE                                      94-2748530
           (STATE OF INCORPORATION)                 (I.R.S. EMPLOYER IDENTIFICATION NO.)
</TABLE>

                             691 S. MILPITAS BLVD.
                           MILPITAS, CALIFORNIA 95035
                    (ADDRESS OF PRINCIPAL EXECUTIVE OFFICES)

       REGISTRANT'S TELEPHONE NUMBER, INCLUDING AREA CODE: (408) 945-8600

        SECURITIES REGISTERED PURSUANT TO SECTION 12(b) OF THE ACT: NONE

          SECURITIES REGISTERED PURSUANT TO SECTION 12(g) OF THE ACT:

                         COMMON STOCK, $.001 PAR VALUE

                          COMMON SHARE PURCHASE RIGHTS
                                (TITLE OF CLASS)

     Indicate by check mark whether the Registrant (1) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities Exchange Act of
1934 during the preceding 12 months (or for such shorter period that the
Registrant was required to file such reports), and (2) has been subject to such
filing requirements for the past 90 days.  Yes [X]     No [ ]

     Indicate by check mark if disclosure of delinquent filers pursuant to Item
405 of Regulation S-K is not contained herein, and will not be contained, to the
best of the Registrant's knowledge, in definitive proxy or information
statements incorporated by reference in Part III of this Form 10-K or any
amendment to this Form 10-K.  Yes [ ]     No [X]

     Based on the closing sale price of the Common Stock on the Nasdaq National
Market System on June 2, 1999, the aggregate market value of the voting stock
held by non-affiliates of the Registrant was $2,486,811,915. Shares of Common
Stock held by each officer and director and by each person known by the Company
to own 5% or more of the outstanding Common Stock have been excluded in that
such persons may be deemed to be affiliates. This determination of affiliate
status is not necessarily a conclusive determination for other purposes.

     The number of shares outstanding of Registrant's Common Stock, $.001 par
value, was 104,447,315 at June 2, 1999.

                      DOCUMENTS INCORPORATED BY REFERENCE

     Part III incorporates information by reference from the definitive Proxy
Statement for the Annual Meeting of Stockholders to be held on September 9,
1999.

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                             INTRODUCTORY STATEMENT

     References made in this Annual Report on Form 10-K to "Adaptec," the
"Company," or the "Registrant" refer to Adaptec, Inc. and its wholly owned
subsidiaries. Adaptec, Easy CD Creator, Direct CD, Spin Doctor, Toast, Adaptec
Jam and the Adaptec logo are trademarks of Adaptec, Inc., which may be
registered in some jurisdictions. All other trademarks used are owned by their
respective owners.

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                                     PART I

ITEM 1. BUSINESS

OVERVIEW AND DESCRIPTION OF BUSINESS SEGMENTS

     Adaptec Inc., a leading supplier of bandwidth management solutions that
significantly enhance total system performance by increasing the data transfer
rates between personal computers ("PCs"), servers, peripherals, and networks,
was incorporated in 1981. The Company operates in four principal segments: Host
I/O (Input/Output), RAID (Redundant Array of Independent Disks), Software and
Peripheral Technology Solutions ("PTS"). A number of trends are driving the need
to increase effective I/O bandwidth between PCs, servers, peripherals and
networks: (i) the introduction of increasingly powerful central processing units
("CPUs"), which require more rapidly accessed and intelligently managed data to
function at their optimal performance level, (ii) operating systems, such as
Windows NT and Windows 98 that allow for faster I/O and multitasking, (iii) the
growth of data-intensive software applications, such as graphics, audio and
video, which require significantly more bandwidth, (iv) the proliferation of
client/server networks, the Internet and corporate intranets, which is in turn
driving growth in the processing power of servers, and (v) growth in high-
performance peripherals, such as high capacity hard disk drives, scanners,
CD-ROMs and CD-R, CD-RW and DVD drives. These factors have created a rapid
increase in the transfer of data between desktop PCs, servers, peripherals, and
networks resulting in substantial I/O and network bottlenecks.

     The Host I/O segment designs, develops, manufactures and markets host bus
adapter ("HBA") boards and chips that allow computers to transfer information to
and from peripherals, such as hard disk drives, scanners, CD-ROMs, CD-Rs,
CD-RWs, DVD-ROMs, and Zip and Jaz drives among many other devices. The Company's
HBAs are based on Small Computer System Interface ("SCSI") technology and are
utilized in servers, high-end workstations and desktops where high performance
I/O is a vital component of overall system performance.

     The RAID segment designs, develops, manufactures and markets bus-based and
microprocessor-based RAID solutions. These products are utilized from entry
level workstations to enterprise-class servers. The Company's RAID adapters
provide performance and functionality, incorporate the latest technical
innovations, and offer superior software functionality to make RAID fast, simple
and reliable.

     The Software segment designs, develops and markets optical media software
for CD-R and CD-RW. This segment includes video editing products and software
utility products that simplify connecting a SCSI host adapter and peripherals to
a microcomputer system. The Company's CD-R and CD-RW products are used for data
storage to optical media, including audio, video and still photos, and provide
users storage alternatives to traditional disk and removable media options.
Additionally, the Company's CD-RW products allow users to transfer downloaded
music from the Internet to CDs for private use. The Company's CD-R software
offerings are available as standalone products, and also ship built-in or
"bundled" with most CD-R drives in the desktop market.

     The business lines that comprised the PTS segment were sold in November
1998 and January 1999 to Texas Instruments, Inc. ("TI") and STMicroelectronics,
Inc. ("ST"), respectively. This segment designed, developed, manufactured and
marketed proprietary integrated circuits ("ICs") for use in mass storage devices
and other peripherals.

     See "Note 18. Segment Reporting and Foreign Operations" in Notes to
Consolidated Financial Statements on page F-28, for further information on the
Company's operating segments.

CORPORATE STRATEGY

     In the second quarter of fiscal 1999, a change in the Company's senior
management team resulted in a decision to refocus the business along its core
competencies. Prior to the change, the Company acquired read channel and
preamplifier application specific integrated circuits ("ASIC") technologies
("ASIC technologies") from Analog Devices, Inc. ("ADI") and purchased Ridge
Technologies, Inc. ("Ridge").

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     In April 1998, the Company acquired ASIC technologies from ADI for $34.4
million in cash. The transaction was accounted for using the purchase method of
accounting. The ASIC technologies acquired from ADI were incorporated into the
mainstream removable PTS business line to enhance its product offering. (See
"Note 9. Acquired In-Process Technology and Related Intangibles" in Notes to
Consolidated Financial Statements on page F-13 for further information).

     In May 1998, the Company purchased Ridge, a development stage company, for
1.2 million shares of the Company's common stock valued at $21.2 million in
common stock and assumed stock options valued at $13.1 million. Prior to the
acquisition the Company owned a 19.9% interest in Ridge with a carrying value of
approximately $1.5 million. The transaction was accounted for using the purchase
method of accounting. The acquisition of Ridge was to allow the Company entry
into the storage subsystems business.

     In the first quarter of fiscal 1999, in connection with management's plan
to improve operating efficiencies and reduce costs, the Company recorded a
restructuring charge of $8.8 million. The restructuring charge was comprised
primarily of severance and benefits related to the involuntary termination of
approximately 550 employees, of which approximately 36% were based in the United
States and the remainder were based in Singapore.

     In furthering management's objective to refocus the business the Company
divested of certain unprofitable business activities including storage
subsystems (primarily those business activities purchased in connection with the
Ridge transaction, see "Note 8. Business Combinations and Related Party
Transactions" in Notes to Consolidated Financial Statements on page F-11 for
further information) external storage, satellite networking, fibre channel and
high-end peripheral technology solutions. In order to improve long-term
profitability, in the second quarter of fiscal 1999, the Company recorded a
restructuring charge of $24.5 million, net of an adjustment to the restructuring
charge taken in the first quarter of fiscal 1999 of $1.4 million. This charge
was comprised primarily of severance and benefits related to the involuntary
termination of approximately 300 U.S. employees and the write-off of inventory,
property and equipment, and other assets including goodwill associated with the
storage subsystems business line.

     On November 6, 1998, the Company entered into a definitive agreement with
TI under which certain assets of the Company's high-end PTS business line were
transferred to TI for $8.5 million in cash. Additionally, the Company agreed to
license certain technologies to TI for $3.7 million. TI also agreed to pay
royalties ranging from 2% - 5% on certain products for up to five years.

     On November 12, 1998, the Company entered into a definitive agreement with
Jaycor Networks, Inc. ("JNI") whereby the Company agreed to contribute certain
tangible and intangible assets related to the fibre channel product line in
exchange for an ownership interest in JNI. The Company received 6.7% of JNI's
outstanding capital stock along with warrants to purchase up to an additional
11.7%. The warrants have a nominal exercise price and will become exercisable
upon the achievement of certain milestones by JNI. The Company and JNI also
entered into a cross-license agreement whereby JNI will pay royalties on certain
products and the Company will license certain technologies from JNI
royalty-free.

     On November 25, 1998, the Company entered into a definitive agreement with
Chaparral Technologies, Inc. ("Chaparral") whereby the Company agreed to
contribute certain tangible and intangible assets related to the Company's
external storage product line for 19.9% of the outstanding stock of Chaparral.
The Company and Chaparral also entered into a cross-license agreement whereby
Chaparral will pay royalties on certain products manufactured by Adaptec or
other manufacturers, respectively. Adaptec will license certain technologies
from Chaparral royalty-free in order to manufacture product for Chaparral.

     On December 18, 1998, the Company entered into a definitive agreement with
BroadLogic, Inc. ("BroadLogic") whereby the Company agreed to contribute certain
tangible and intangible assets related to the Company's satellite networking
product line in exchange for 19.9% of the outstanding stock of BroadLogic and
warrants to purchase BroadLogic common stock at $4 per share. The Company and
BroadLogic also entered into a royalty-free cross-license agreement.

     On January 15, 1999, the Company sold to ST certain assets and certain
intellectual property rights relating to the Company's mainstream removable PTS
business line for an aggregate purchase price of
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$72.1 million in cash and $3.3 million in cost reimbursements. The Company
received all of the cash proceeds in January 1999 and recorded a gain of
approximately $10.0 million (net of taxes of $21.5 million) in the fourth
quarter of fiscal 1999. The Company and ST also entered into a royalty-free
cross-license agreement.

     The Company's investments in JNI, Chaparral and BroadLogic approximate fair
value and are accounted for under the cost method. The Combined investments are
less than $1.0 million at March 31, 1999.

     During the quarter ended March 31, 1999, the Company recorded a
restructuring charge of $6.6 million, net of an adjustment to the restructuring
charges taken in the first and second quarters of fiscal 1999 of $1.2 million.
This charge resulted from a reduction in the infrastructure that supported
businesses divested in fiscal 1999. The Company's fourth quarter restructuring
charge was comprised primarily of severance and benefits related to the
involuntary termination of approximately 125 employees, of which most were based
in the U.S. and the write-off of property and equipment.

PRODUCTS

     The Company's products are designed and manufactured using a core set of
technologies and resources. The Company continues to utilize, for all segments,
a process called concurrent engineering, in which manufacturing, marketing, and
engineering work together early in the development cycle to meet the demands of
emerging technologies as well as decrease the "time to volume" of product
shipments. The Company's semiconductor technology design centers develop
products for all markets the Company serves. The Company maintains separate
engineering functions for each of its operating segments. The Company maintains
an Internet Web site to provide its customers with detailed company and product
information.

  Host I/O

     The Company's Host I/O products, including SCSI host adapter boards and
chips and related firmware and software, meet the demanding I/O and connectivity
requirements of enterprise servers, technical workstations and high-performance
desktop and portable computers across all important microprocessor-based
platforms.

     The Company's Host I/O products, which incorporate the Company's
proprietary single chip architectures provide customers comprehensive I/O
solutions in the markets it serves. Ultra2 SCSI products include (peripheral
component interconnect) PCI Ultra2 solutions for workstation applications such
as CAD/CAM, financial analysis and desktop publishing. The Company provides bus
mastering, SCSI host adapters that manage all I/O processing activity, thereby
freeing the CPU to perform other operations. The Company offers these host
adapters across all ranges of bus architectures including PCI, ISA, EISA, and
PCMCIA as well as for previous generations of the SCSI standard. The Company
also provides non-bus mastering host adapters that provide standardized SCSI
connectivity between the CPU and its peripherals. To expand further the market
for its products, the Company continues to develop and market I/O solutions
meeting specific original equipment manufacturer ("OEM") requirements and
turnkey kits for the distributor channels. These kits include a SCSI host
adapter and related software that enable end-users to more readily connect SCSI
peripherals to their microcomputer.

     The Company has undertaken numerous initiatives to increase the
accessibility, ease of use, and versatility of the SCSI standard. Advanced SCSI
programming interface ("ASPI"), an industry standard developed by the Company,
enables users to integrate high-performance SCSI peripherals with computers
using popular operating systems, such as Windows 98, Windows NT, NetWare, OS/2,
and UNIX. In addition, the Company has strategic relationships with leading
operating system vendors, such as IBM Corporation, Microsoft Corporation, and
Novell Inc., resulting in joint development projects to embed the Company's
software within their operating systems.

  RAID

     Adaptec RAID products include bus-based and microprocessor-based RAID
solutions primarily in the NT server market. These products are utilized in a
wide range of servers from entry level workstations to

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enterprise-class servers. Adaptec's RAID adapters provide performance and
functionality, incorporate 64-bit PCI technology and offer superior software
functionality to make RAID creation and manipulation fast, simple and reliable.
The Company believes it is the only significant RAID vendor to offer the benefit
of proprietary SCSI development in its RAID controllers. In addition, Adaptec's
Ultra2 SCSI RAID card family supports advanced RAID features, including bootable
arrays, hot-swap drives, extended parity protection, dynamic sector repairing
and round-the-clock fault tolerance for business and mission critical data.

     All Adaptec SCSI RAID Cards are rigorously tested with hundreds of SCSI
systems and peripherals like hard disk drives, tape drives, Zip, Jaz, CD-R,
CD-RW, and scanners to ensure customers are getting compatibility that they can
rely upon.

  Software

     The Company's software products focus on providing CD-R and CD-RW mastering
capability as well as providing complementary editing utilities. The products
include Easy CD Creator(TM), CD Direct(TM), Spin Doctor(TM), Toast(TM) and
Adaptec Jam(TM) and are popular for data storage to optical media and provides
users a storage alternative to other removable media. Adaptec's software
offerings are available in retail packages and also ship built-in or "bundled"
with most industry-leading CD-R and CD-RW drives.

  Peripheral Technology Solutions

     The Company developed proprietary ICs for use in mass storage devices. The
Company worked closely with customers to provide complete solutions that
included sophisticated ICs that optimize overall performance.

MARKETING AND CUSTOMERS

  Host I/O

     The Company believes it has successfully positioned itself as a leading
supplier of a full range of I/O solutions providing bandwidth management. The
Company sells its products through a direct sales force to substantially all
major server and PC manufacturers, as well as most of the major electronic
distributors worldwide. The Company works closely with its OEM customers on the
design of current and next generation products to meet the specific requirements
of system integrators and end-users. The Company provides its OEM customers with
extensive applications and system design support. The Company also sells
board-based products to end-users through major computer product distributors
and provides technical support to its customers worldwide.

     The Company's OEM customers include Acer Incorporated, Asustek Computer,
Inc., Compaq Computer Corporation, Dell Computer Corporation, Fujitsu Ltd., IBM
Corporation, Siemens Nixdorf and Solectron Corporation . The Company's major
distributors include Computer 2000, Inc., Ingram Micro, Inc., Karma/CHS
Elektronic, Macrotron Systems, Inc., Merisel, Inc., Nichimen Electronics,
Softbank Corporation, Synnex and Tech Data Corporation. Net revenues from the
Host I/O segment were $520.1 million, $701.1 million and $667.7 million in
fiscal 1999, 1998 and 1997, respectively.

     The Company emphasizes solution-oriented customer support as a key element
of its marketing strategy and maintains technical applications groups in the
field as well as at the Company's headquarters. Support provided by these groups
includes assisting current and prospective customers in the use of the Company's
products, writing application notes, and conducting seminars for system
designers. The systems-level expertise and software experience of the Company's
engineering staff is also available to customers with particularly difficult I/O
design problems. A high level of customer support is also maintained through
technical support hotlines, electronic bulletin boards, and dial-in-fax
capability.

  RAID

     The Company markets its RAID products through a direct sales force to all
major server manufacturers. The Company's marketing and engineering teams work
closely with the OEMs on the design of current and

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next generation products to meet the customer requirements. Adaptec provides its
OEMs with extensive customer support. It also sells RAID solutions to end-users
through major distributors and maintains training and support for distribution
customers such as value added resellers ("VARs"), system integrators and
distributors. Sales and marketing of RAID product to OEM's is primarily handled
by the Company's marketing and engineering teams. Senior management familiar
with the customer's market and needs may also participate in the marketing
process. Sales to other customers such as VAR's, system integrators and
distributors are marketed similarly with somewhat less engineering support than
is required by OEM's.

     Dell Computer Corporation is the primary OEM customer for the Company's
RAID product offering. Major distributors for RAID include Tech Data Corporation
and Ingram Micro, Inc. Net revenues from the RAID segment were $32.2 million,
$14.5 million and $3.3 million in fiscal 1999, 1998 and 1997, respectively.

  Software

     CD-R and CD-RW drives are shipping in ever increasing quantities which is
driven by price performance and backward compatibility with CD-ROM drives. The
Company has leveraged its strength in developing high-performance peripheral
connectivity software to attain its position as a leading supplier of CD-R
software. Through its close relationship with leading CD-RW and DVD drive
manufacturers and system OEMs the Company ensures software support and
compatibility for its product offerings. The Company's product emphasis has been
to provide high-performance, high-quality, consumer-friendly software
applications that enable the usage of optical storage. The Company's strong
brand recognition and retail presence results from its extensive compatibility
and usability testing with its OEMs.

     The Company's OEM customers include Compaq Computer Corporation, Hewlett
Packard Company, Sony Corporation, Philips Electronics, N.V., Gateway 2000,
Inc., Yamaha, Smart & Friendly, IBM Corporation, Matshusita/Panasonic, Sanyo,
Samsung Electronics Co., Ltd., Ricoh Corporation, and Mitsumi Electronics
Corporation. The Company's major distribution customers include Ingram Micro,
Inc., Tech Data Corporation, Computer 2000, Inc. Major retailers include
CompUSA, Inc. and Best Buy Co., Inc. Net revenues from the Software segment were
$47.1 million, $38.2 million and $17.4 million in fiscal 1999, 1998 and 1997,
respectively.

     The development of compelling new multimedia applications that focus on
data storage, digital photography, music CD creation, the availability of
digital music formats such as MP3, Internet audio, and desktop video drive the
need for optical storage devices.

  Peripheral Technology Solutions

     PTS ICs were used in rigid and removable mass storage products. PTS
customers included mass storage OEMs such Samsung Electronics Co., Ltd., Western
Digital Corp. and Toshiba. The business lines that comprised the PTS segment
were sold in fiscal 1999. The net revenues from the PTS segment were $90.8
million, $249.8 million and $245.4 million in fiscal 1999, 1998 and 1997,
respectively.

COMPETITION

     The markets for all of the Company's products within the Host I/O, RAID and
Software segments are highly competitive and are characterized by rapid
technological advances, frequent new product introductions, evolving industry
standards, and competitive price pressures. The Company's competitors continue
to introduce products with improved performance characteristics, and its
customers continue to develop new applications. As the Company has continued to
broaden its bandwidth management product offerings into the desktop and server
environments, it has experienced, and expects to experience in the future,
significantly increased competition both from existing competitors and from
additional companies that may enter its markets. Some of these companies have
greater technical, marketing, manufacturing, and financial resources than the
Company. The Company will have to continue to develop and market appropriate
products to remain competitive. The Company believes one of the factors in its
competitive success is its continued commitment of resources to research and
development in the future.

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  Host I/O

     In the Host I/O market, the Company competes with LSI Logic Corporation and
a number of other smaller host adapter manufacturers. The Company's competitive
strategy is to continue to leverage its technical leadership and concentrate on
the most technology-intensive solutions. To address the competitive nature of
the business the Company designs advanced features into its products, with
particular emphasis on data transfer rates, software-defined features, and
compatibility with major operating systems and most peripherals. The Company
believes the principal competitive factors in this market are performance, a
comprehensive array of solutions ranging from connectivity products for the
personal computing market to high-performance products for the enterprise-wide
computing and networked environments, product features, brand awareness,
financial resources, and technical and administrative support. The Company
believes that it presently competes favorably with respect to each of these
factors.

  RAID

     The markets for the Company's RAID controller products have been highly
competitive and are likely to remain competitive. Furthermore, there are several
companies with established reputations in the RAID controller market, which have
established relationships with several of the large system OEMs. The Company
believes that its principal competitors for RAID controllers are American
Megatrends, Inc. (AMI) and Mylex Corporation. The customers historically
accounting for the most significant volumes of the RAID market are also large
OEMs, any of which could develop their own controllers at any time rather than
purchase such products from the Company.

     The Company believes the principle competitive factors in this market are
performance, software features, a comprehensive array of solutions ranging from
entry level servers and workstations to high-end enterprise-class servers, brand
awareness, financial resources and technical and administrative support. The
Company presently believes it competes favorably with respect to each of these
factors.

  Software

     The rapidly growing CD-RW market has attracted a number of software
competitors ranging from small operations to large consumer software companies.
The Company's believes its competitive strength is its technical expertise in
providing quality connectivity support coupled with its strong retail presence.
Its competitive strategy is to continue to focus on providing its OEM customers
with high-quality software solutions at competitive prices, while leveraging its
OEM presence to drive consumers to upgrade to its full-featured retail
applications. The Company believes the primary competitive factors in the OEM
market to be performance, pricing, and support, while at retail the factors
relate more to the compelling nature of its products and consumer awareness.

  Peripheral Technology Solutions

     In November 1998 and January 1999, the business lines which constituted the
PTS segment were sold to Texas Instruments, Inc. and STMicroelectronics, Inc.
respectively, and accordingly, the Company no longer participates in this
market.

BACKLOG

     At March 31, 1999, the Company's backlog was approximately $56 million
compared with $61 million at March 31, 1998. Backlog levels may vary with
product availability, delivery lead times and customer order delays, changes or
cancellations. Accordingly, the Company's backlog as of any particular date may
not necessarily be an indicator of future operating results.

MANUFACTURING

     The Company's Singapore manufacturing facility produces and tests host
adapters, RAID and software products. The Company continuously strives to lower
costs, shorten manufacturing cycle times, and improve

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service to customers. The Company's products make extensive use of standard
logic, printed circuit boards, and random access memory from several outside
suppliers in addition to the Company's custom designed integrated circuits.

     All semiconductor wafers used in manufacturing the Company's products are
processed to its specifications by outside suppliers and internally tested by
the Company. The Company has secured capacity through agreements with Taiwan
Semiconductor Manufacturing Co., Ltd. ("TSMC") that ensure availability of a
portion of the Company's wafer needs for both current and future technologies
for which the Company has made advance payments.

PATENTS AND LICENSES

     The Company believes that patents are of less significance in its industry
than such factors as innovative skills, technological expertise, and marketing
abilities. However, the Company encourages its engineers to document patentable
inventions and has applied for and continues to apply for patents both in the
United States and in foreign countries when it deems it to be advantageous to do
so. There can be no assurance that patents will be issued or that any patent
issued will provide significant protection or could be successfully defended.

     As is the case with many companies in the electronics industry, it may be
desirable in the future for the Company to obtain technology licenses from other
companies. The Company has occasionally received notices of claimed infringement
of intellectual property rights and may receive additional such claims in the
future. The Company evaluates all such claims and, if necessary, will seek to
obtain appropriate licenses. There can be no assurance that any such licenses,
if required, will be available on acceptable terms.

RESEARCH AND DEVELOPMENT

     The Company believes research and development is fundamental to its
success, especially in integrated circuit design, software development, and I/O
solutions that encompass emerging technologies. The development of proprietary
integrated circuits that support multiple architectures and peripheral devices
requires a combination of engineering disciplines. In addition, extensive
knowledge of computer and subsystem architectures, expertise in the design of
high-speed digital ICs, and knowledge of operating system software is essential.
The Company's research and development efforts continue to focus on the
development of complete solutions that include proprietary ICs, firmware, and
software that support multiple architectures and peripheral devices. These I/O
solutions facilitate high-speed data transfer rates, which are essential to the
enhanced performance of client/server networking environments, applications
requiring high-performance I/O, and the adoption of various peripheral devices.

     The Company intends to continue to leverage its technical expertise and
product innovation capabilities to address I/O solutions across a broad range of
users and platforms. The Company continues to invest resources in all business
segments to develop its core products as well as next generation hardware and
software solutions.

     Approximately 25% of the Company's employees are engaged in research and
development. In fiscal 1999, 1998, and 1997, the Company spent approximately
$146.2 million (21.1% of net revenues), $169.0 million (16.8% of net revenues)
and $128.5 million (13.8% of net revenues), respectively, for research and
development.

EMPLOYEES

     At March 31, 1999, the Company had 2,123 employees. The Company's continued
success will depend in large measure on its ability to attract and retain highly
skilled employees who are in great demand.

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EXECUTIVE OFFICERS

     The following sets forth certain information with regard to executive
officers of Adaptec as of June 23, 1999 except that ages are as of March 31,
1999:

     Mr. Robert N. Stephens (age 53) has served as Chief Executive Officer since
April 1999 and President since October 1998. Prior to his promotion, Mr.
Stephens had served as Chief Operating Officer since November 1995. From 1993 to
1995, he founded and served as Chairman for Power I/O Corporation.

     Mr. Andrew J. Brown (age 39) has served as Vice President of Finance and
Chief Financial Officer since August 1998. From November 1996 to February 1999,
he served as Vice President, and from May 1994 to February 1999, he served as
Corporate Controller and Principal Accounting Officer. From July 1988 to April
1994 he served in various financial roles within the Company.

     Mr. Kenneth B. Arola (age 43) has served as Vice President since June 1998,
and as Corporate Controller and Principal Accounting Officer since February
1999. From July 1995 to June 1998 he served as Director of Corporate Finance.
From December 1990 to July 1995 he served in various financial roles within the
Company.

     Mr. J. Peter Campagna (age 46) has served as Vice President and Treasurer
since August 1998. Prior to that, Mr. Campagna served as the Director of Tax
from October 1994 to July 1998.

     Mr. Sam Kazarian (age 56) has served as Vice President of Operations since
May 1990.

     Mr. Michael A. Ofstedahl (age 39) has served as Vice President of Worldwide
Sales, since February 1998. From January 1996 to February 1998, Mr. Ofstedahl
was Vice President of Sales for Chromatic Research, Inc. and from April 1993 to
January 1996, he was Vice President of Strategic Accounts at Adaptec.

     Mr. Henry P. Massey (age 59) has served as Secretary since November 1989.
For more than the last five years, Mr. Massey has been a practicing lawyer and a
member of Wilson, Sonsini, Goodrich & Rosati, Professional Corporation, a law
firm and general outside counsel to the Company.

FOREIGN AND DOMESTIC OPERATIONS

     See "Note 18. Segment Reporting and Foreign Operations" in Notes to
Consolidated Financial Statements on page F-28.

CERTAIN FACTORS BEARING ON FUTURE RESULTS

     This report contains forward-looking statements that involve risks and
uncertainties. For example, Management's Discussion and Analysis of Results of
Operations and Financial Condition includes statements relating to expected
sales growth, gross margins anticipated operating expenditures and anticipated
capital expenditures. The statements contained in this document that are not
purely historical are forward-looking statements within the meaning of Section
27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act
of 1934, including without limitation statements regarding the Company's
expectations, beliefs, intentions or strategies regarding the future. All
forward-looking statements included in this document are based on information
available to the Company on the date hereof, and the Company assumes no
obligation to update any such forward-looking statements. The Company's actual
results could differ materially from those anticipated in these forward-looking
statements as a result of certain factors, including those set forth in the
following risk factors and elsewhere in this document. In evaluating the
Company's business, prospective investors should consider carefully the
following factors in addition to the other information set forth in this
document.

     Future Operating Results Subject to Fluctuation. In the second half of
fiscal 1998 and the first half of fiscal 1999, the Company's operating results
were adversely affected by shifts in corporate and retail buying patterns,
increased competition, emerging technologies, economic instability in Asia and
turbulence in the computer disk drive industry. In addition, fiscal 1999
operating results were significantly impacted by unusual

                                       10
<PAGE>   11

charges and credits including write-offs of acquired in-process technology,
costs related to the termination of the Symbios acquisition, restructuring
charges, impairment of assets and terminations of senior executives and the gain
on the sale of PTS and the gain on the sale of land. In the future, the
Company's operating results may fluctuate as a result of these factors and as a
result of a wide variety of other factors, including, but not limited to,
cancellations or postponements of orders, shifts in the mix of the Company's
products and sales channels, changes in pricing policies by the Company's
suppliers, interruption in the supply of custom integrated circuits, the market
acceptance of new and enhanced versions of the Company's products, product
obsolescence and general worldwide economic and computer industry fluctuations.
In addition, fluctuations may be caused by future accounting pronouncements,
changes in accounting policies, and the timing of acquisitions of other business
products and technologies and any associated charges to earnings. The volume and
timing of orders received during a quarter are difficult to forecast. The
Company's customers from time to time encounter uncertain and changing demand
for their products. Customers generally order based on their forecasts. If
demand falls below such forecasts or if customers do not control inventories
effectively, they may cancel or reschedule shipments previously ordered from the
Company. The Company has historically operated with a relatively small backlog,
especially relating to orders of its Host I/O products and has set its operating
budget based in part on expectations of future revenues. Because much of the
Company's operating budget is relatively fixed in the short term, if revenues do
not meet the Company's expectations then the Company's operating income and net
income may be disproportionately affected. Operating results in any particular
quarter, which do not meet the expectations of securities analysts, are likely
to cause volatility in the price of the Company's common stock.

     Certain Risks Associated with the High-Performance Computer Market. The
Company's host interface solutions are used primarily in high performance
computer systems designed to support bandwidth-intensive applications and
operating systems. Historically, the Company's growth has been supported by
increasing demand for systems that support client/server and Internet/intranet
applications, computer-aided engineering, desktop publishing, multimedia, and
video. Beginning in the second half of fiscal 1998, the demand for such systems
slowed as more businesses chose to use relatively inexpensive PC's for desktop
applications and information technology managers shifted resources toward
resolving Year 2000 problems and investing in network infrastructure. Should
demand for such systems continue to slow, the Company's business or operating
results could be materially adversely affected by a resulting decline in demand
for the Company's products.

     Certain Risks Associated with the Server Market. The Company's RAID
products are used primarily in workstations and enterprise servers. The use of
RAID technology in this market is an industry standard, however, there can be no
assurance that another technology will not replace RAID in the disk array
controller marketplace or that there will be continuing widespread acceptance or
growth of the use of RAID products in general, or the Company's RAID controllers
in particular, in that market. Should demand for such systems slow or should the
Company's products not be widely accepted, the Company's business or operating
results could be materially adversely affected by a resulting decline for the
Company's products.

     Certain Risks Associated with the Software Market. The Company's Software
products are used primarily in high performance computer systems to enable the
control of SCSI peripherals and/or enable CD recording/writing. The Company's
sales are primarily to major OEM's and distributors, thus the Company's business
depends on general economic and business conditions and the growth of the CD
recording and high-performance computer markets. Should demand for the Company's
products slow and/or the CD recording market not develop as quickly as expected,
the Company's business or operating results could be materially adversely
affected by a resulting decline in demand for the Company's products.

     Reliance on Industry Standards, Technological Change, Dependence on New
Products. The computer industry is characterized by various standards and
protocols that evolve with time. The Company's current products are designed to
conform to certain industry standards and protocols such as SCSI, UltraSCSI,
Ultra2 SCSI, PCI, RAID, and Fast Ethernet. In particular, a majority of the
Company's revenues are currently derived from products based on the SCSI
standard. If consumer acceptance of these standards was to decline, or if they
were replaced with new standards, and if the Company did not anticipate these
changes and develop new products, the Company's business or operating results
could be materially adversely affected. For
                                       11
<PAGE>   12

example, the Company believes that changes in consumers' perceptions of the
relative merits of SCSI based products and products incorporating a competing
standard, Ultra-DMA, have materially adversely affected the sales of the
Company's products and may adversely affect the Company's future sales.

     The markets for the Company's products are characterized by rapidly
changing technology, frequent new product introductions, and declining average
selling prices over product life cycles. The Company's future success is
therefore highly dependent upon the timely completion and introduction of new
products at competitive price/performance levels. The success of new product
introductions is dependent on several factors, including proper new product
definition, product costs, timely completion and introduction of new product
designs, quality of new products, differentiation of new products from those of
the Company's competitors, and market acceptance of the Company's and its
customers' products. As a result, the Company believes that continued
significant expenditures for research and development will be required in the
future. There can be no assurance that the Company will successfully identify
new product opportunities and develop and bring new products to market in a
timely manner, that products or technologies developed by others will not render
the Company's products or technologies obsolete or noncompetitive, or that the
Company's products will be selected for design into the products of its targeted
customers. The failure of any of the Company's new product development efforts
could have a material adverse effect on the Company's business or operating
results. In addition, the Company's revenues and operating results could be
materially adversely impacted if its customers shifted their demand to a
significant extent away from board-based I/O solutions to application-specific
ICs.

     Competition. The markets for all of the Company's products are intensely
competitive and are characterized by rapid technological advances, frequent new
product introductions, evolving industry standards, and price erosion. In the
host adapter market, the Company competes with a number of host adapter
manufacturers, including LSI Logic Corporation and other small host adapter
manufacturers. The Company's principal competitors for RAID solutions in the
server market are American Megatrends, Inc., Mylex Corporation and captive
suppliers. The Company's principal competitors in the Software segment range
from small operations to large consumer software companies. As the Company has
continued to broaden its bandwidth management product offerings into the
desktop, server, and networking environments, it has experienced, and expects to
experience in the future, significantly increased competition both from existing
competitors and from additional companies that may enter its markets. Some of
these companies have greater technical, marketing, manufacturing, and financial
resources than the Company. There can be no assurance that the Company will be
able to make timely introduction of new leading-edge solutions in response to
competitive threats, that the Company will be able to compete successfully in
the future against existing or potential competitors or that the Company's
business or operating results will not be materially adversely affected by price
competition.

     Certain Risks Associated With Acquisitions. As part of its overall
strategy, the Company may continue to acquire or invest in complementary
companies, products, or technologies and to enter into joint ventures and
strategic alliances with other companies. Risks commonly encountered in such
transactions include the difficulty of assimilating the operations and personnel
of the combined companies, the potential disruption of the Company's ongoing
business, the inability to retain key technical and managerial personnel, the
inability of management to maximize the financial and strategic position of the
Company through the successful integration of acquired businesses, additional
expenses associated with amortization of acquired intangible assets, dilution of
existing equity holders, the maintenance of uniform standards, controls,
procedures, and policies, and the impairment of relationships with employees and
customers as a result of any integration of new personnel. There can be no
assurance that the Company will be successful in overcoming these risks or any
other problems encountered in connection with such business combinations,
investments, or joint ventures, or that such transactions will not materially
adversely affect the Company's business, financial condition, or operating
results.

     Certain Risks Associated with Restructuring. During fiscal 1999, the
Company decided to exit certain activities and undertook certain restructuring
actions. In connection with these actions, the Company effected a workforce
reduction of 975 people. There is no assurance that these actions will be
successful or have a positive impact on results of operations. Furthermore,
should such actions have a negative impact on the
                                       12
<PAGE>   13

Company's ability to design and develop new products, market new or existing
products, or produce and/or purchase products at competitive prices, these
actions could have a material adverse impact on the Company's results of
operations.

     Year 2000 Compliance Issues. The inability of computers, software and other
equipment utilizing microprocessors to recognize and properly process data
fields containing a 2-digit year is commonly referred to as the Year 2000
Compliance issue. As the year 2000 approaches, such systems may be unable to
accurately process certain date-based information.

     During fiscal 1998, the Company completed implementation of Enterprise
Resource Planning ("ERP") software to replace the Company's existing core
business applications and accordingly does not anticipate any internal Year 2000
issues. Additionally, the Company has analyzed the remainder of its business not
addressed by the ERP software and has, through its standard product development
cycle, ensured its products are Year 2000 Compliant through procedures, tests
and methodologies that have been in effect since fiscal 1997. However, if
internal systems do not properly recognize and process date information for
years into and beyond the turn of the century, there could be a material adverse
impact on other Company's operations. A significant disruption of the Company's
financial or business systems would materially adversely impact the Company's
ability to process orders, manage production and issue and pay invoices. The
Company's inability to perform these functions for a long period of time could
result in a material adverse impact on the Company's result of operations and
financial condition. Failure of these systems could cause a disruption in the
manufacturing process and could result in a delay in completion and shipment of
product.

     The Company has communicated with others with whom it does significant
business, including major distributors, suppliers, customer, vendors and
financial service organizations, to assess their Year 2000 Compliance readiness
with respect to both their operations and the products and services they supply.
The analysis will continue into fiscal 2000, with corrective action taken
commensurate with the criticality of affected products and services. However, if
companies with whom the Company does significant business fail because of a Year
2000 malfunction, there could be a material adverse impact on the Company's
operating results. The Company believes it is currently being impacted by its
customers' redirection of corporate management information system budgets
towards resolving Year 2000 Compliance issues. Continuation of this trend could
lower the demand for the Company's products if corporate buyers defer purchases
of high-end business PCs.

     The Company has developed a contingency plan for some of its applications
and systems to address any of the consequences of internal or external failures
to be Year 2000 Compliant. It is also in the process of creating a contingency
plan for internal and external sources, including key suppliers, which it
expects to complete in the first half of fiscal 2000. The potential
ramifications of a year 2000 type failure are potentially far-reaching and
largely unknown. The Company cannot assure you that a contingency plan in effect
at the time of a system failure will adequately address the immediate or
long-term effects of a failure, or that such a failure would not have a material
adverse impact on the Company's operations or financial results in spite of
prudent planning.

     Dependence on Wafer Suppliers and Other Subcontractors. All of the finished
silicon wafers used for the Company's products are currently manufactured to the
Company's specifications by independent foundries. The Company currently
purchases all of its wafers through a supply agreement with TSMC. The
manufacture of semiconductor devices is sensitive to a wide variety of factors,
including the availability of raw materials, the level of contaminants in the
manufacturing environment, impurities in the materials used, and the performance
of personnel and equipment. While the quality, yield, and timeliness of wafer
deliveries to date have been acceptable, there can be no assurance that
manufacturing yield problems will not occur in the future. In addition, although
the Company has various supply agreements with its supplier, a shortage of raw
materials or production capacity could lead the Company's wafer supplier to
allocate available capacity to customers other than the Company, or to internal
uses. Any prolonged inability to obtain wafers with competitive performance and
cost attributes, adequate yields, or timely deliveries from its foundries would
delay production and product

                                       13
<PAGE>   14

shipments and could have a material adverse effect on the Company's business or
operating results. The Company expects that it will in the future seek to
convert its fabrication process arrangements to smaller wafer geometries and to
more advanced process technologies. Such conversions entail inherent
technological risks that can affect yields and delivery times. If for any reason
the Company's current supplier was unable or unwilling to satisfy the Company's
wafer needs, the Company would be required to identify and qualify additional
foundries. There can be no assurance that any additional wafer foundries would
become available, that such foundries would be successfully qualified, or that
such foundries would be able to satisfy the Company's requirements on a timely
basis.

     In order to secure wafer capacity, the Company from time to time has
entered into "take or pay" contracts that committed the Company to purchase
specified wafer quantities over extended periods, and has made prepayments to
foundries. In the future, the Company may enter into similar transactions or
other transactions, including, without limitation, non-refundable deposits with
or loans to foundries, or equity investments in, joint ventures with or other
partnership relationships with foundries. Any such transaction could require the
Company to seek additional equity or debt financing to fund such activities.
There can be no assurance that the Company will be able to obtain any required
financing on terms acceptable to the Company.

     Additionally, the Company relies on subcontractors for the assembly and
packaging of the ICs included in its products. The Company has no long-term
agreements with its assembly and packaging subcontractors. In addition, the
Company is increasingly using board subcontractors to better balance production
runs and capacity. There can be no assurance that such subcontractors will
continue to be able and willing to meet the Company's requirements for such
components or services. Any significant disruption in supplies from, or
degradation in the quality of components or services supplied by, such
subcontractors could delay shipments and result in the loss of customers or
revenues or otherwise have a material adverse effect on the Company's business
or operating results.

     Certain Issues Related to Distributors. The Company's distributors
generally offer a diverse array of products from several different
manufacturers. Accordingly, there is a risk that these distributors may give
higher priority to selling products from other suppliers, thus reducing their
efforts to sell the Company's products. A reduction in sales efforts by the
Company's current distributors could have a material adverse effect on its
business or operating results. The Company's distributors may on occasion build
inventories in anticipation of substantial growth in sales, and if such growth
does not occur as rapidly as anticipated, distributors may decrease the amount
of product ordered from the Company in subsequent quarters. In addition, there
has recently been an industry trend towards the elimination of price protection
and distributor incentive programs and channel assembly. These trends could
result in a change in distributor business habits, with distributors possibly
deciding to decrease the amount of product held so as to reduce inventory levels
and this in turn could reduce the Company's revenues in any given quarter and
give rise to fluctuation in the Company's operating results. In addition, the
Company may from time to time take actions to reduce inventory levels at
distributors. These actions could reduce the Company's revenues in any given
quarter and give rise to fluctuations in the Company's operating results.

     Dependence on Key Personnel. The Company's future success depends in large
part on the continued service of its key technical, marketing, and management
personnel, and on its ability to continue to attract and retain qualified
employees, particularly those highly skilled design, process, and test engineers
involved in the design enhancements and manufacture of existing products and the
development of new products and processes. The competition for such personnel is
intense, and the loss of key employees could have a material adverse effect on
the Company's business or operating results.

     Certain Risks Associated with International Operations. The Company's
manufacturing facility and various subcontractors it utilizes from time to time
are located primarily in Asia. Additionally, the Company has various sales
offices and customers throughout Europe, Japan, and other countries. The
Company's international operations and sales are subject to political and
economic risks, including political instability, currency controls, exchange
rate fluctuations, and changes in import/export regulations, tariffs, and
freight rates. The Company may use forward exchange contracts to manage any
exposure associated with certain

                                       14
<PAGE>   15

foreign currency denominated commitments. In addition, because the Company's
wafer supplier, TSMC, is located in Taiwan, the Company is subject to the risk
of political instability in Taiwan, including the potential for conflict between
Taiwan and the People's Republic of China.

     Intellectual Property Protection and Disputes. The Company has historically
devoted significant resources to research and development and believes that the
intellectual property derived from such research and development is a valuable
asset that has been and will continue to be important to the success of the
Company's business. Although the Company actively maintains and defends its
intellectual property rights, no assurance can be given that the steps taken by
the Company will be adequate to protect its proprietary rights. In addition, the
laws of certain territories in which the Company's products are or may be
developed, manufactured, or sold, including Asia and Europe, may not protect the
Company's products and intellectual property rights to the same extent as the
laws of the United States. The Company has from time to time discovered
counterfeit copies of its products being manufactured or sold by others.
Although the Company maintains an active program to detect and deter the
counterfeiting of its products, should counterfeit products become available in
the market to any significant degree it could materially adversely affect the
business or operating results of the Company.

     From time to time, third parties may assert exclusive patent, copyright,
and other intellectual property rights to technologies that are important to the
Company. There can be no assurance that third parties will not assert
infringement claims against the Company in the future, that assertions by third
parties will not result in costly litigation or that the Company would prevail
in such litigation or be able to license any valid and infringed patents from
third parties on commercially reasonable terms. Litigation, regardless of its
outcome, could result in substantial cost and diversion of resources of the
Company. Any infringement claim or other litigation against or by the Company
could materially adversely affect the Company's business or operating results.

     Need for Interoperability. The Company's products must be designed to
interoperate effectively with a variety of hardware and software products
supplied by other manufacturers, including microprocessors, peripherals, and
operating system software. The Company depends on significant cooperation with
these manufacturers in order to achieve its design objectives and produce
products that interoperate successfully. While the Company believes that it
generally has good relationships with leading system, peripheral, and
microprocessor suppliers, there can be no assurance that such suppliers will not
from time to time make it more difficult for the Company to design its products
for successful interoperability or decide to compete with the Company.

     Natural Disasters. The Company's corporate headquarters are located near
major earthquake faults. Any damage to the Company's information systems caused
as a result of an earthquake, fire or any other natural disasters could have a
material adverse effect on the Company's business, financial condition and
results of operations.

     Volatility of Stock Price. The stock market in general, and the market for
shares of technology companies in particular, have from time to time experienced
extreme price fluctuations, which have often been unrelated to the operating
performance of the affected companies. In addition, factors such as
technological innovations or new product introductions by the Company, its
competitors, or its customers may have a significant impact on the market price
of the Company's common stock. Furthermore, quarter-to-quarter fluctuations in
the Company's results of operations caused by changes in customer demand,
changes in the microcomputer and peripherals markets, or other factors, may have
a significant impact on the market price of the Company's common stock. In
addition, the Company's stock price may be affected by general market conditions
and international macroeconomic factors unrelated to the Company's performance
such as those recently evidenced by the financial turmoil in Asia. These
conditions, as well as factors that generally affect the market for stocks of
high technology companies, could cause the price of the Company's common stock
to fluctuate substantially over short periods.

                                       15
<PAGE>   16

ITEM 2. PROPERTIES

     The Company owns seven buildings (approximately 479,000 square feet) in
California, which are primarily used by the Company for corporate offices,
research, manufacturing, marketing, and sales, and one building (approximately
200,000 square feet) in Longmont, Colorado, for research, technical support,
marketing, sales, and administrative support. The Company is actively pursuing
the sale of the Longmont facility and has classified it in assets held for sale
(current assets) at March 31, 1999.

     The Company leases seven buildings (approximately 164,000 square feet) in
California, of which two are used as outside warehouses, four are sublet or
available for sublease and one is occupied by the Company. Other facilities
include Redmond, Washington (3,000 square feet); Hudson, Wisconsin (9,000 square
feet); and Nashua, New Hampshire (23,000 square feet) to support technical
design efforts and sales.

     Adaptec Manufacturing Singapore is located in one owned facility
(approximately 172,000 square feet) and is used by the Company for research,
manufacturing, sales and warehousing. The Company also leases four sales offices
in the United States, and one sales office each in Brussels, Belgium; Munich,
Germany; Bretonneux, France; London, England; Lindfield, Australia; Singapore;
Seoul, Korea; Taipei, Taiwan; Hong Kong; and Tokyo, Japan. The Tokyo office also
provides technical design efforts and technical support with the Brussels office
providing technical support to Europe. The Company believes its existing
facilities and equipment are well maintained and in good operating condition and
believes its manufacturing facilities, together with the use of independent
manufacturers where required or desirable, will be sufficient to meet its
anticipated manufacturing needs through fiscal 2000.

     The Company also acquired a parcel of land in Fremont California, for $12.9
million in fiscal 1996. The Company is actively pursuing the sale of the Fremont
land and has classified it in assets held for sale (current assets) at March 31,
1999. Additionally, the Company owned three parcels of land in Lake Forest,
California. One parcel was sold in March 1999 and the remaining two parcels were
classified in assets held for sale (current assets) at March 31, 1999 and were
subsequently sold in April 1999. The Company's future facilities requirements
will depend upon the Company's business, and the Company believes additional
space, if required, may be obtained on reasonable terms.

ITEM 3. LEGAL PROCEEDINGS

     A class action lawsuit is pending in the United States District Court for
the Northern District of California against the Company and certain of its
officers and directors. The action alleges that the Company made false and
misleading statements at various times during the period between April 1997 and
January 1998 in violation of the federal securities laws. The complaint does not
set forth purported damages. In addition, a derivative action is pending in the
Superior Court of the State of California against the Company and certain of its
current and former officers and directors alleging that the individual
defendants improperly profited from transactions in the Company's stock during
the same time period referenced by the class action lawsuit. The Company
believes the lawsuit and derivative action are without merit and intends to
defend itself vigorously.

     The IRS is currently auditing the Company's income tax returns for fiscal
1994 to 1996. No proposed adjustments have been received for these years. The
Company believes sufficient taxes have been provided and that the ultimate
outcome of the IRS audits will not have a material adverse impact on the
Company's financial position or results of operations.

     From time to time, the Company is subject to certain litigation, claims and
assessments in the normal course of business. The Company believes that any
liability with respect to such routine litigation, individually or in the
aggregate, is not likely to be material to the Company's financial position or
results of operations.

ITEM 4. SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS

     Not applicable.

                                       16
<PAGE>   17

                                    PART II

ITEM 5. MARKET FOR REGISTRANT'S COMMON STOCK AND RELATED SHAREHOLDER MATTERS

     The Company's common stock is traded in the over-the-counter market under
the Nasdaq Stock Market symbol ADPT. The following table sets forth the range of
the high and low prices by quarter as reported by Nasdaq National Market System.

<TABLE>
<CAPTION>
                                                               1999                        1998
                                                     ------------------------    ------------------------
                                                        HIGH          LOW           HIGH          LOW
                                                     ----------    ----------    ----------    ----------
<S>                                                  <C>           <C>           <C>           <C>
First quarter......................................  $24 1/8       $12 1/2       $40 5/8       $30 1/8
Second quarter.....................................  15            8 3/8         51 3/8        38
Third quarter......................................  19 7/8        7 7/8         54 1/4        33 7/8
Fourth quarter.....................................  26 3/4        17 7/16       39 1/2        19 7/16
</TABLE>

     At March 31, 1999, there were 986 holders of record of the Company's common
stock. The Company has not paid cash dividends on its common stock and does not
currently plan to pay cash dividends to its stockholders in the near future.

                                       17
<PAGE>   18

ITEM 6. SELECTED FINANCIAL DATA

RESULTS OF OPERATIONS DATA FOR THE YEARS ENDED MARCH 31:

     Note that certain items below previously reported in specific financial
statement captions have been reclassified to conform with current presentation.

<TABLE>
<CAPTION>
                                     1999          1998          1997         1996        1995
                                  ----------    ----------    ----------    --------    --------
                                             (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
<S>                               <C>           <C>           <C>           <C>         <C>
Net revenues....................  $  692,441    $1,007,293    $  933,868    $659,347    $466,194
Cost of revenues................     284,503       391,100       388,969     275,939     205,596
Gross profit....................     407,938       616,193       544,899     383,408     260,598
Operating expenses:
  Research and development......     146,172       169,022       128,530      87,628      60,848
  Sales, marketing, and
     administrative.............     180,986       215,624       162,979     117,332      81,966
  Write-off of acquired
     in-process technology......      45,482            --        90,457      52,313          --
  Restructuring and other
     charges....................      68,788         6,715         1,705          --          --
Total operating expenses........     441,428       391,361       383,671     257,273     142,814
Gain on sale of PTS.............      31,476            --            --          --          --
Income (loss) before cumulative
  effect of a change in
  accounting principle..........     (13,293)      181,877       107,561     103,375      93,402
Cumulative effect of a change in
  accounting principle, net of
  tax benefit...................          --        (9,000)           --          --          --
Net income (loss)...............     (13,293)      172,877       107,561     103,375      93,402

NET INCOME (LOSS) PER SHARE DATA FOR THE YEARS ENDED MARCH 31:
  Basic
     Income (loss) before
       cumulative effect of a
       change in accounting
       principle................  $    (0.12)   $     1.61    $     0.99    $   0.99    $   0.90
     Cumulative effect of a
       change in accounting
       principle................          --         (0.08)           --          --          --
                                  ----------    ----------    ----------    --------    --------
     Net income (loss)..........       (0.12)         1.53          0.99        0.99        0.90
  Diluted
     Income (loss) before
       cumulative effect of a
       change in accounting
       principle................  $    (0.12)   $     1.54    $     0.93    $   0.95    $   0.87
     Cumulative effect of a
       change in accounting
       principle................          --         (0.08)           --          --          --
                                  ----------    ----------    ----------    --------    --------
     Net income (loss)..........       (0.12)         1.46          0.93        0.95        0.87
  Weighted average shares
     outstanding
     Basic......................     110,127       113,172       108,456     104,136     103,371
     Diluted....................     110,127       118,432       115,596     109,073     106,942
Balance Sheet Data as of March
  31:
     Working capital............  $  857,651    $  850,610    $  693,629    $334,989    $294,058
     Total assets...............   1,173,068     1,275,229     1,043,494     646,486     435,708
     Long-term debt, net of
       current portion..........     230,000       230,000       230,850       4,250       7,650
     Stockholders' equity.......     790,702       904,745       688,325     511,945     371,644
</TABLE>

                                       18
<PAGE>   19

NORMALIZED RESULTS OF OPERATIONS DATA FOR THE YEARS ENDED MARCH 31:

     The following normalized results of operations of the Company exclude the
write-off of acquired in-process technology, restructuring and other charges,
gain on the sale of Peripheral Technology Solutions ("PTS"), revenue and
expenses related to the PTS segment, gain on the sale of land and the cumulative
effect of a change in accounting principle. The normalized results of operations
presented are not necessarily indicative of future operating results.
Additionally note that certain items previously reported in specific financial
statement captions have been reclassified to conform with current presentation.

<TABLE>
<CAPTION>
                                        1999        1998        1997        1996        1995
                                      --------    --------    --------    --------    --------
                                              (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
<S>                                   <C>         <C>         <C>         <C>         <C>
Net revenues........................  $601,639    $757,507    $688,488    $530,885    $366,138
Cost of revenues....................   219,919     255,999     251,762     198,298     144,938
Gross profit........................   381,720     501,508     436,726     332,587     221,200
Operating expenses:
  Research and development..........   115,758     123,093      90,550      68,356      45,125
  Sales, marketing, and
     administrative.................   167,545     202,306     149,438     109,928      75,417
Total operating expenses............   283,303     325,399     239,988     178,284     120,542
Net income..........................    86,935     147,455     155,469     124,618      80,558

NORMALIZED NET INCOME PER SHARE DATA FOR THE YEARS ENDED MARCH 31:
Net income per share:
  Basic.............................  $   0.79    $   1.30    $   1.43    $   1.20    $   0.78
  Diluted...........................      0.77        1.25        1.35        1.14        0.75
Weighted average shares outstanding:
  Basic.............................   110,127     113,172     108,456     104,136     103,371
  Diluted...........................   112,775     118,432     115,596     109,073     106,942
</TABLE>

                                       19
<PAGE>   20

ITEM 7. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS
OF OPERATIONS

RESULTS OF OPERATIONS

     The following table sets forth the items in the Consolidated Statements of
Operations as a percentage of net revenues:

<TABLE>
<CAPTION>
                   YEARS ENDED MARCH 31,                        1999     1998    1997
                   ---------------------                        ----     ----    ----
<S>                                                             <C>      <C>     <C>
Net revenues................................................    100%     100%    100%
Cost of revenues............................................     41       39      42
                                                                ---      ---     ---
  Gross margin..............................................     59       61      58
                                                                ---      ---     ---
Operating expenses:
  Research and development..................................     21       17      14
  Sales, marketing and administrative.......................     26       21      17
  Write-off of acquired in-process technology...............      7       --      10
  Restructuring and other charges...........................     10        1      --
                                                                ---      ---     ---
          Total operating expenses..........................     64       39      41
                                                                ---      ---     ---
Income (loss) from operations...............................     (5)      22      17
                                                                ---      ---     ---
Interest and other income...................................      5        3       1
Interest expense............................................     (2)      (1)     --
Gain on sale of PTS.........................................      5       --      --
                                                                ---      ---     ---
Income from operations before provision for income taxes and
  cumulative effect of a change in accounting principle.....      3       24      18
Provision for income taxes..................................      5        6       6
                                                                ---      ---     ---
Income (loss) before cumulative effect of a change in
  accounting principle......................................     (2)      18      12
Cumulative effect of a change in accounting principle, net
  of tax benefit............................................     --       (1)     --
                                                                ---      ---     ---
Net income (loss)...........................................     (2)%     17%     12%
                                                                ===      ===     ===
</TABLE>

NORMALIZED RESULTS OF OPERATIONS

     The following unaudited, normalized table sets forth the items in the
Consolidated Statements of Operations on a normalized basis as a percentage of
net revenues and excludes the write-off of acquired in-process technology,
restructuring and other charges, gain on the sale of Peripheral Technology
Solutions ("PTS"), revenue and expenses related to the PTS segment, gain on the
sale of land and the cumulative effect of a change in accounting principle. The
information presented below is not necessarily indicative of future operating
results.

<TABLE>
<CAPTION>
                   YEARS ENDED MARCH 31,                      1999    1998    1997
                   ---------------------                      ----    ----    ----
<S>                                                           <C>     <C>     <C>
Net revenues................................................  100%    100%    100%
Cost of revenues............................................   37      34      37
                                                              ---     ---     ---
  Gross margin..............................................   63      66      63
                                                              ---     ---     ---
Operating expenses:
  Research and development..................................   19      16      13
  Sales, marketing and administrative.......................   28      27      22
                                                              ---     ---     ---
          Total operating expenses..........................   47      43      35
                                                              ---     ---     ---
Income from operations......................................   16      23      28
                                                              ---     ---     ---
Interest income.............................................    6       4       2
Interest expense............................................   (2)     (2)     --
                                                              ---     ---     ---
Income before provision for income taxes....................   20      25      30
Provision for income taxes..................................    6       6       7
                                                              ---     ---     ---
Net income..................................................   14%     19%     23%
                                                              ===     ===     ===
</TABLE>

                                       20
<PAGE>   21

SEC COMMENT LETTER

     On June 8, 1999, the Company received a comment letter from the Securities
and Exchange Commission ("SEC") relating to certain previous 1934 Act filings
with the SEC, primarily comments about disclosure in the Company's Management's
Discussion and Analysis and Notes to Consolidated Financial Statements. The
Company has addressed the comments in its response to the SEC dated June 16,
1999 and has incorporated such comments into its disclosures in this fiscal 1999
Annual Report on Form 10-K to the extent practicable. However, there can be no
assurance that the SEC will not take exception with the Company's responses and
disclosures and require that the Company file additional responses and
disclosures in its periodic reports.

RESULTS OF OPERATIONS

     In fiscal 1999, the Company adopted Statement of Financial Accounting
Standards No. 131 ("SFAS 131"), "Disclosures about Segments of an Enterprise and
Related Information." The Company evaluated its product segments in accordance
with SFAS 131 and concluded that its reportable segments are Host I/O
(Input/Output), RAID (Redundant Array of Independent Disks), Software and
Peripheral Technology Solutions ("PTS").

     The Host I/O segment designs, develops, manufactures and markets host bus
adapter ("HBA") boards and chips that allow computers to transfer information to
and from peripherals, such as hard disk drives, scanners, CD-ROMs, CD-Rs,
CD-RWs, DVD-ROMs, and Zip and Jaz drives among many other devices. The Company's
HBAs are based on Small Computer System Interface ("SCSI") technology and are
utilized in servers, high-end workstations and desktops where high performance
I/O is a vital component of overall system performance.

     The RAID segment designs, develops, manufactures and markets bus-based and
microprocessor-based RAID solutions. These products are utilized from entry
level workstations to enterprise-class servers. The Company's RAID adapters
provide performance and functionality, incorporate the latest technical
innovations, and offer superior software functionality to make RAID fast, simple
and reliable.

     The Software segment designs, develops and markets optical media software
for CD-R and CD-RW. This segment includes video editing products and software
utility products that simplify connecting a SCSI host adapter and peripherals to
a microcomputer system. The Company's CD-R and CD-RW products are used for data
storage to optical media, including audio, video and still photos, and provide
users storage alternatives to traditional disk and removable media options.
Additionally, the Company's CD-RW products allow users to transfer downloaded
music from the Internet to CDs for private use. The Company's CD-R software
offerings are available as standalone products, and also ship built-in or
"bundled" with most CD-R drives in the desktop market.

     The business lines that comprised the PTS segment were sold in November
1998 and January 1999 to Texas Instruments, Inc. ("TI") and STMicroelectronics,
Inc. ("ST"), respectively. This segment designed, developed, manufactured and
marketed proprietary integrated circuits ("ICs") for use in mass storage devices
and other peripherals.

     NET REVENUES. The Company's fiscal 1999 net revenues decreased 31% from the
prior year to $692.4 million. Net revenues for the year were comprised of $520.1
million from the Host I/O segment, down 26% from the prior year, $32.2 million
from the RAID segment, up 122% from the prior year, $47.1 million from the
Software segment, up 23% from the prior year, and $90.8 million from the
recently sold PTS segment, down 64% from the prior year. Other net revenues for
fiscal 1999 of $2.2 million represent revenue from recently divested businesses,
including external storage, satellite networking and fibre channel. Although
these businesses were divested, the Company continues to hold minority
investments in Chaparral Technologies, Inc. ("Chaparral"), BroadLogic Inc.
("BroadLogic") and Jaycor Networks, Inc. ("JNI"), the companies which acquired
these businesses.

     Fiscal 1999 net revenues from the Host I/O segment declined as a result of
Ultra-DMA penetration in the desktop market. The Company expects that Host I/O
net revenues from the desktop market will continue to be adversely impacted by
Ultra-DMA in the future. Ultra-DMA has not had a material impact on revenue
                                       21
<PAGE>   22

derived from the workstation and server markets, although there can be no
assurance that Ultra-DMA will not have a material adverse impact in the future.
The decline was partially offset by the demand for high performance I/O fueled
by the growth in on-line applications like electronic commerce, on-line
publishing, and proliferation of the Internet and corporate intranets. Net
revenues from the RAID segment increased primarily as a result of the
introduction of the Company's high-end RAID product. Net revenues from the
Software segment increased as a result of continued increased demand for CD-R
and CD-RW drives. Net revenues from the PTS segment for fiscal 1999 represent
approximately nine months of revenue versus twelve months in fiscal 1998, as the
products that comprised the PTS segment were sold to TI and ST in November 1998
and January 1999, respectively. Proportionately, net revenues from the PTS
segment still declined due to continued weakness in the disk drive industry and
Asian markets.

     The Company's fiscal 1998 net revenues increased 8% from the prior year to
$1,007.3 million. Net revenues for the year were comprised of $701.1 million
from the Host I/O segment, up 5% from the prior year, $14.5 million from the
RAID segment, up 341% from the prior year, $38.2 million from the Software
segment, up 119% from the prior year and $249.8 million from the PTS segment, up
2% from the prior year. Other net revenues for fiscal 1998 of $3.7 million
included the external storage, satellite networking and fibre channel
businesses. Net revenues from the Host I/O segment increased as a result of
growth in the high-performance microcomputer markets, demand for SCSI in the
client/server environment, the ongoing deployment of sophisticated operating
systems and an increase in the use of diverse peripherals such as high capacity
hard drives, scanners and optical drives, offset by a trend toward lower-priced
PCs for mainstream consumer desktop applications as well as enhancements to the
Ultra-DMA standard, which is used predominantly in the desktop market. Net
revenues for the RAID segment increased as a result of growth in market
acceptance of the Company's RAID products. Net revenues from the Software
segment increased due to increased demand for CD-R and CD-RW drives. Net
revenues from the Company's PTS segment were adversely impacted by the turbulent
disk drive market, as well as instability in the Asian markets, which resulted
in a less than expected increase in PTS net revenues.

     GROSS MARGIN. The Company's fiscal 1999 gross margin was 59% compared to
61% in fiscal 1998 and 58% in fiscal 1997. The fiscal 1999 gross margin
decreased from fiscal 1998 primarily due to underutilized manufacturing capacity
resulting from the decline in Host I/O net revenues and the sale of the PTS
segment. Additionally, the Company's fiscal 1999 gross margin was adversely
impacted by the increase in Host I/O sales to OEMs as a percentage of total Host
I/O sales, due to the Company's focus on reducing inventory in the channel. The
Company's gross margins increased in fiscal 1998 due to greater shipments of the
Company's higher margin Host I/O products and the Company's continued focus on
component cost reductions and manufacturing efficiencies.

     RESEARCH AND DEVELOPMENT EXPENSES. The Company's fiscal 1999 research and
development expenses decreased 14% from the prior year to $146.2 million. The
decrease in total dollars was primarily attributable to company-wide cost
reduction programs which included reductions in workforce and the curtailment of
costs related to the divesting of certain unprofitable business activities. The
Company expects to realize the full benefits of these reductions in fiscal 2000.
Fiscal 1999 research and development expenses as a percentage of net revenues
were 21% compared to 17% in fiscal 1998. The increase as a percentage of net
revenues was directly related to the decline in fiscal 1999 net revenues and the
cost reductions expected from the restructuring and divesting activities were
not fully realized until the end of the fiscal year.

     The Company's fiscal 1998 research and development expenses increased 32%
to $169.0 million from $128.5 million in fiscal 1997. The increase in total
dollars was primarily a result of increased staffing levels to support the
Company's investment in new hardware and software solutions, including RAID,
CD-R software solutions, external storage and fibre channel. Fiscal 1998
research and development expenses as a percentage of net revenues were 17%
compared to 14% in fiscal 1997. The increase as a percentage of net revenues was
primarily due to lower than expected revenues.

     SALES, MARKETING, AND ADMINISTRATIVE EXPENSES. The Company's fiscal 1999
sales, marketing and administrative expenses decreased 16% from the prior year
to $181.0 million. The decrease in total dollars is primarily attributable to
company-wide cost reduction programs, specifically reductions in workforce. The

                                       22
<PAGE>   23

Company expects to realize the full benefits of these reductions in fiscal 2000.
Fiscal 1999 sales, marketing and administrative expenses as a percentage of net
revenues are 26% compared to 21% in fiscal 1998. The increase as a percentage of
net revenues is primarily related to the decline in fiscal 1999 net revenues,
and the cost reductions expected from the restructuring and divesting activities
were not fully realized until the end of the fiscal year.

     The Company's fiscal 1998 sales, marketing and administrative expenses
increased 32% to $215.6 million from $163.0 million in fiscal 1997. The increase
in total dollars was a result of increased staffing levels required to support
the Company's worldwide growth. In addition, the Company increased advertising
and promotional programs aimed at leveraging the Company's brand image and
generating demand for its products. Fiscal 1998 sales, marketing and
administrative expenses as a percentage of net revenues were 21% compared to 17%
in fiscal 1997. The increase as a percentage of net revenues was primarily due
to lower than expected net revenues.

     WRITE-OFF OF ACQUIRED IN-PROCESS TECHNOLOGY. During fiscal 1999 and 1997,
the Company purchased complementary businesses recorded under the purchase
method of accounting, resulting in an aggregate write-off of acquired in-process
technology of $45.5 million and $90.5 million, respectively.

     In the first quarter of fiscal 1999, the Company purchased Ridge
Technologies, Inc. ("Ridge") and acquired read channel and preamplifier ASIC
technologies ("ASIC technologies") from Analog Devices, Inc. ("ADI"), which
resulted in a first quarter write-off of acquired in-process technology charge
of $39.4 million and $26.4 million, respectively. The unamortized goodwill
associated with Ridge was written-off in the second quarter of fiscal 1999, in
connection with the Company's restructuring activities and decision to exit the
storage subsystems business. The write-off was included in "Restructuring and
other charges" in the Consolidated Statements of Operations. In the fourth
quarter of fiscal 1999, the Company reduced its estimate of the amount allocated
to acquired in-process technology from the purchase of ASIC technologies from
ADI by $20.3 million from $26.4 million previously reported in the first quarter
of fiscal 1999 to $6.1 million. Amortization of intangibles increased
approximately $1.7 million in each of the first three quarters of fiscal 1999
from $7.5 million to $12.6 million for the year ended March 31, 1999. In the
fourth quarter of fiscal 1999, the Company relieved the unamortized goodwill of
$20.0 million associated with ASIC technologies purchased from ADI in connection
with the sale of the Company's mainstream removable PTS business line. The
Company reduced the gain originally reported in the Company's Form 8-K dated
January 15, 1999 by $14.0 million from $45.5 million previously reported to
$31.5 million for the fourth quarter and year ended March 31, 1999. Basic and
diluted net income (loss) per share for the four quarters of fiscal 1999 were
impacted by the restatement as follows:

<TABLE>
<CAPTION>
                                                              PRIOR TO      SUBSEQUENT TO
                        FISCAL 1999                          RESTATEMENT     RESTATEMENT
                        -----------                          -----------    -------------
<S>                                                          <C>            <C>
First quarter:
  Basic....................................................    $(0.68)         $(0.51)
  Diluted..................................................    $(0.68)         $(0.51)

Second quarter:
  Basic....................................................    $(0.22)         $(0.23)
  Diluted..................................................    $(0.22)         $(0.23)

Third quarter:
  Basic....................................................    $ 0.25          $ 0.23
  Diluted..................................................    $ 0.24          $ 0.23

Fourth quarter:
  Basic....................................................    $ 0.58          $ 0.43
  Diluted..................................................    $ 0.55          $ 0.41
</TABLE>

     There was no impact on fiscal 1999 year-to-date basic or diluted net loss
per share. Additionally, there will be no impact on future results of operations
as the goodwill associated with ASIC technologies purchased from ADI was
relieved in the fourth quarter of fiscal 1999.

                                       23
<PAGE>   24

     The Company allocated amounts to acquired in-process technology in the
first quarter of fiscal 1999 in a manner consistent with widely recognized
appraisal practices at the date of the acquisition of ASIC technologies from
ADI. Subsequent to the acquisitions, the SEC staff expressed views that took
issue with certain appraisal practices generally employed in determining the
fair value of the acquired in-process technology that was the basis for the
Company's measurement of the acquired in-process technology charge. The charge
of $26.4 million associated with ASIC technologies purchased from ADI, as first
reported, was based upon assumptions and appraisal methodologies the SEC has
since announced it does not consider appropriate.

     As a result of computing the acquired in-process technology using the SEC
preferred methodology, the Company decided to revise the amount originally
allocated to acquired in-process technology. The Company revised its results of
operations for fiscal 1999 and will amend its Reports on Form 10-Q for the first
three quarters of fiscal 1999 previously filed with the SEC.

     The Company and its advisors believe that the restated acquired in-process
technology charge relating to ASIC technologies purchased from ADI of $6.1
million is valued consistently with the SEC staff's current views regarding
valuation methodologies. There can be no assurances, however, that the SEC staff
will not take issue with any assumptions used in the Company's valuation model
and require the Company to further revise the amount allocated to acquired
in-process technology.

     In fiscal 1997, the Company acquired complementary businesses and
technologies consisting of Western Digital's Connectivity Solutions Group
("WD"), CD-R software technology from Corel, Inc. ("Corel"), Data Kinesis, Inc.
("DKI"), Sigmax Technology, Inc. ("Sigmax"), Toast CD-R technology ("Toast"),
and certain assets from Skipstone, Inc. ("Skipstone") for an aggregate purchase
price of $124.3 million, resulting in a write-off of acquired in-process
technology charge of $90.5 million. Unamortized goodwill associated with WD was
relieved in fiscal 1999 in connection with the sale of the high-end PTS business
line to TI, for which no gain was derived. Goodwill associated with Corel was
minimal and expensed in fiscal 1997. Unamortized goodwill associated with Sigmax
and Skipstone was written-off in fiscal 1998 and is included in "Restructuring
and other charges" in the Consolidated Statements of Operations. The acquired
in-process technology associated with DKI was completed subsequent to the
acquisition and is now incorporated in the Company's products which began
shipping in fiscal 1999. The acquired in-process technology associated with
Toast related to further developments of the already existing Toast product.
Such developments were later incorporated into the Company's products. Goodwill
associated with DKI and Toast will be fully amortized during fiscal 2000.

     Additionally, in fiscal 1997, the Company acquired Cogent Data
Technologies, Inc. ("Cogent") under the pooling-of-interests method of
accounting. Cogent's historical operations, net assets, and cash flows were not
material to the Company's consolidated financial statements and, therefore, have
not been reflected in the Company's consolidated financial results prior to the
acquisition. Beginning at the date of acquisition, the book value of the
acquired assets and assumed liabilities as well as the results of Cogent's
operations and cash flows, all of which are not material to the Company, have
been combined with those of the Company.

     RESTRUCTURING AND OTHER CHARGES. During fiscal 1999, the Company incurred
$39.9 million in restructuring charges, $21.5 million in acquisition related
charges and $7.4 million in asset impairments and other charges. During fiscal
1998, the Company incurred $6.7 million in asset impairments and other charges.
During fiscal 1997, the Company incurred $1.7 million in acquisition related
charges.

     During fiscal 1999, the Company completed a reduction in workforce of
approximately 975 employees and divested certain unprofitable business
activities (including storage subsystems, fibre channel, external storage,
satellite networking, and high-end PTS) to strategically refocus the Company and
bring operating expenses in line with net revenues. The Company continues to
hold a minority interest in the fibre channel, external storage and satellite
networking technologies through investments in JNI, Chaparral and BroadLogic,
respectively. The Company incurred approximately $8.8 million, $24.5 million and
$6.6 million of charges in the first, second and fourth quarters of fiscal 1999
related to these restructuring activities. The second and fourth quarter charges
are net of $1.4 million and $1.2 million adjustments, respectively, relating to
charges taken in previous quarters. Total fiscal 1999 restructuring charges are
$39.9 million and consisted of severance
                                       24
<PAGE>   25

and benefits of $21.6 million, asset write-offs of $13.5 million and facilities
and other costs of $4.8 million, of which $17.4 million represented non-cash
charges. During fiscal 1999, the Company expended $20.0 million of cash related
to these restructuring activities. The Company substantially completed all of
the restructuring activities as of March 31, 1999 and the remaining balance of
$2.5 million is primarily expected to be paid out in the first two quarters of
fiscal 2000.

     The Company expects the fiscal 1999 restructuring activities could result
in an annual expense reduction in the range of $80 - $90 million. These savings
may be potentially offset by incremental costs associated with anticipated
business growth.

     In fiscal 1999, the Company recorded $21.5 million in acquisition costs
related to the termination of the Symbios, Inc. acquisition. Additionally, the
Company recorded $4.0 million and $3.4 million in non-cash asset impairment
charges and executive termination costs, respectively. The impairment charges
related to $1.4 million in manufacturing equipment deemed unnecessary due to
non-temporary declines in production volume and the write-off of $2.6 million of
non-trade related receivables classified in other current assets. The executive
termination costs, relating to three executives, consisted of $1.9 million in
severance and benefits and $1.5 million in non-cash stock compensation charges
resulting from amended option agreements.

     In fiscal 1998, the Company recorded non-cash asset impairment charges of
$6.7 million. The impairment charges consisted of impairments of the remaining
goodwill balances from the acquisition of Sigmax and Skipstone of $1.5 million
and $1.7 million, respectively, and the write-down of the Company's minority
investment in Ridge of $3.5 million. The remaining goodwill for the acquisition
of Sigmax was written-off when the Company decided to abandon this business
after the R&D project fell behind and the critical market window was missed, the
engineers acquired in the purchase had left the Company, and the intellectual
property was deemed to have no alternative use. The remaining goodwill from the
acquisition of Skipstone was written-off when the Company decided to abandon
this business as the market for this technology was not developing at the rate
required to earn a reasonable return on its investment, most of engineers
acquired in the purchase had left the Company, and the intellectual property had
no alternative use. The impairment and write-down of the Ridge minority
investment was a result of delays in the Ridge product. Ridge was not able to
bring the Ridge product under development to market in a timely manner, which
management believed resulted in a permanent impairment of the value of the
Company's underlying investment in Ridge.

     In fiscal 1997, the Company recorded $1.7 million in acquisition costs
related to the acquisition of Cogent.

     INTEREST AND OTHER INCOME. The Company's fiscal 1999 interest and other
income increased 7% to $35.1 million from the prior year primarily due to the
gain on the sale of land in California of $1.6 million, which represented the
other income in fiscal 1999. The remaining $33.5 million of interest and other
income represents interest earned on investments. Fiscal 1998 interest income
increased 147% to $32.9 million from $13.3 million in fiscal 1997. The increase
from fiscal 1997 was due to higher cash balances during fiscal 1998 as a result
of cash generated from operations and proceeds received in connection with
$230.0 million of 4 3/4% Convertible Subordinated Notes that the Company issued
in February 1997. Interest expense for fiscal 1999 and 1998 of $12.1 million and
$12.4 million, respectively, is primarily related to the 4 3/4% Convertible
Subordinated Notes. Interest expense for fiscal 1997 of $2.7 million is
primarily related to two months of interest on the 4 3/4% Convertible
Subordinated Notes which were issued in February 1997.

     GAIN ON THE SALE OF PTS. The Company sold the high-end PTS business line to
TI in November 1998 for $8.5 million in cash and the mainstream removable PTS
business line to ST for $72.1 million in cash and $3.3 million in cost
reimbursements. The sale of the mainstream removable PTS business line to ST
resulted in a $10.0 million gain, net of taxes of $21.5 million. The gain on the
sale of PTS was reduced in the fourth quarter of fiscal 1999 from that
originally reported in the Company's Form 8-K dated January 15, 1999. The
reduction reflects the increase in goodwill resulting from the fiscal 1999
fourth quarter restatement of acquired in-process technology of ASIC
technologies purchased from ADI, which was incorporated into the business line
sold to ST.

                                       25
<PAGE>   26

     INCOME TAXES. The Company's effective tax rate for fiscal 1999 was 164%
compared to 26% and 37% for fiscal 1998 and 1997. This increase in effective tax
rate was primarily due to the write-off of acquired in-process technology and
goodwill, which are not deductible for tax purposes, and the gain associated
with the sale of PTS. In the third quarter of fiscal 1999, the Company's
normalized effective tax rate changed (exclusive of the write-off of acquired
in-process technology and goodwill and the gain associated with the sale of PTS)
from 25% to 28% due to a geographic shift of earnings resulting from
restructuring and business divestitures. For fiscal 1998 and 1997, the Company's
normalized effective tax rate was 25% (exclusive of the write-off of acquired
in-process technology and goodwill).

     The difference between the Company's normalized effective tax rate and the
U.S. federal statutory tax rate is primarily due to income earned in Singapore
where the Company is subject to a significantly lower effective tax rate,
resulting from a tax holiday relating to certain of its products. The terms of
the tax holiday provide that profits derived from certain products will be
exempt from tax through 2006, subject to certain conditions.

     The Company's tax related liabilities were $65.8 million, $25.2 million and
$8.0 million at March 31, 1999, 1998 and 1997 respectively. Tax related
liabilities are primarily comprised of income, withholding and transfer taxes
accrued by the Company in the taxing jurisdictions in which it operates around
the world, including, but not limited to, the United States, Singapore, Japan,
Germany and Belgium. The amount of the liability is based on management's
evaluation of its tax exposures in light of the complicated nature of the
business transactions entered into by the Company in a global business
environment.

     NET INCOME (LOSS). The Company's net loss for fiscal 1999 was $13.3
million, representing diluted net loss per share of $0.12, compared to net
income of $172.9 million and $107.6 million in fiscal 1998 and 1997,
representing diluted net income per share of $1.46 and $0.93, respectively. On a
normalized basis, net income for fiscal 1999 was $86.9 million, representing
normalized diluted net income per share of $0.77, compared to normalized net
income of $147.5 million and $155.5 million in fiscal 1998 and 1997,
representing normalized diluted net income per share of $1.25 and $1.35,
respectively. The normalized results exclude the write-off of acquired
in-process technology, restructuring and other charges, gain on the sale of PTS,
revenue and expenses related to the PTS segment, gain on the sale of land and
the cumulative effect of a change in accounting principle.

LIQUIDITY AND CAPITAL RESOURCES

     OPERATING ACTIVITIES. Net cash provided by operating activities during
fiscal 1999 was $207.7 million. Net cash generated from operating activities
during fiscal 1999 resulted from a net loss of $13.3 million adjusted for
non-cash items including the write-off of acquired in-process technology of
$45.5 million, non-cash charges associated with restructuring and other charges
of $22.9 million and depreciation and amortization of $50.2 million.
Additionally, the net loss was adjusted for the pre-tax gain on the sale of PTS
of $31.5 million. Cash generated from operating activities during fiscal 1999
was also impacted by the decrease in accounts receivable and inventory of $68.1
million and $16.8 million, respectively, and the increase in accrued liabilities
of $36.2 million. The change in deferred income taxes and accounts payable was
primarily offset by the income tax benefit from employee stock transactions and
the change in other assets and prepaid expenses (exclusive of land held for sale
reclassified to prepaid expenses).

     Net cash provided by operating activities during fiscal 1998 of $245.1
million was primarily attributable to net income of $172.9 million adjusted by
non-cash items including the cumulative effect of a change in accounting
principle of $9.0 million, depreciation and amortization of $42.9 million,
provision for doubtful accounts of $4.0 million and non-cash charges associated
with restructuring and other charges of $6.7 million. Increases in accounts
receivable and inventories were largely offset by decreases in other assets and
prepaid expenses and an increase in accounts payable.

     Net cash provided by operating activities during fiscal 1997 of $245.5
million was primarily attributable to net income of $107.6 million adjusted by
non-cash items including the net write-off of acquired in-process technology of
$88.7 million (net of taxes) and depreciation and amortization of $28.6 million.
Increases in accounts receivable and prepaid expenses were largely offset by
increases in accounts payable and accrued liabilities.
                                       26
<PAGE>   27

     In each of fiscal years 1996 through 1998, the Company entered into
agreements with Taiwan Semiconductor Manufacturing Co., Ltd. ("TSMC") which
provides the Company with guaranteed capacity for wafer fabrication in exchange
for advance payments by the Company. The Company recorded the prepayments as
either prepaid expenses or other assets based upon the amount expected to be
utilized in the next 12 months. As wafers are received from TSMC, the prepaid
expenses balance is reclassified to inventory. The Company utilized $18.2
million and $9.8 million of the prepayments in fiscal 1999 and 1998,
respectively, which were capitalized into inventory. The advance payments
expected to be realized in the next 12 months of $8.4 million are classified in
prepaid expenses and the remaining advance payments or $21.1 million are
classified in other assets and are expected to be realized by the Company during
the term of the agreements through December 31, 2002.

     In fiscal 1998, the Company entered into one of the TSMC agreements, which
provided the Company with increased wafer fabrication capacity in return for
advance payments totaling $35.3 million. The Company signed a non-interest
bearing promissory note for the $35.3 million, which was due in two equal
installments of approximately $17.6 million and $17.7 million. The first
installment was paid in January 1998. During fiscal 1999, the Company
determined, based upon analyses performed each quarter, that the anticipated
future manufacturing requirements would not be sufficient to utilize the prepaid
wafer capacity. Accordingly, the Company and TSMC mutually agreed to terminate
the agreement and the remaining unpaid balance on the related promissory note.
Further, TSMC agreed to refund the Company the $17.6 million previously paid, in
four equal quarterly installments. The Company reversed the $35.3 million of
prepayments classified in other assets as well as the $17.7 million of long-term
debt and recorded a $17.7 million receivable due from TSMC, which is classified
in prepaid expenses.

     Additionally, in fiscal 1999, the Company and TSMC amended another
agreement to extend the term of the agreement by two years through December 31,
2002, and TSMC agreed to refund the Company $5.4 million of advanced payments,
payable in four equal quarterly installments. This amount due from TSMC was also
reclassified from other assets to prepaid expenses.

     INVESTING ACTIVITIES. Net cash provided by investing activities during
fiscal 1999 was $55.4 million. During fiscal 1999, the Company received $76.0
million in net proceeds from the sale of PTS. The sale was offset in part by the
purchase of certain net assets in connection with acquisition of ASIC
technologies from ADI and purchase of Ridge accounted for under the purchase
method of accounting (net of cash received) of $34.1 million and the purchase of
property and equipment of $30.3 million. Additionally, the Company had $43.9
million of cash inflow related to proceeds from maturities of marketable
securities, net of reinvestments.

     Net cash used for investing activities during fiscal 1998 was $346.1
million and included the net reinvestment of $239.8 million of marketable
securities. The Company also continued to make various building and leasehold
improvements to its facilities and invest in equipment for product development
and manufacturing to support current and future business requirements. Purchases
of property and equipment of $97.7 million during fiscal 1998 included $11.3
million for land located in California.

     Net cash used for investing activities during fiscal 1997 was $221.3
million. During fiscal 1997, the Company made payments of $107.2 million, net of
cash received, in connection with the acquisitions of WD, Corel, DKI, Sigmax,
Toast and Skipstone. The Company acquired Cogent in a transaction accounted for
as a pooling-of-interests through the issuance of 3 million shares of its common
stock. During fiscal 1997, the Company purchased property and equipment totaling
$88.0 million. Additionally, the Company entered into an agreement with Lucent
Technologies, Inc. ("Lucent") to sell $21.0 million of fabrication equipment
that the Company had previously purchased in fiscal 1997 in connection with a
separate agreement with Lucent that ensured the Company of the availability of
certain levels of wafer capacity from Lucent. The new agreement cancelled the
initial capacity agreement and required Lucent to purchase the equipment from
the Company in fiscal 1998.

     FINANCING ACTIVITIES. Net cash used for financing activities during fiscal
1999 was $172.7 million. During fiscal 1999, the Company repurchased $200.2
million of its common stock and made debt payments totaling

                                       27
<PAGE>   28

$5.6 million. The Company received proceeds of $33.1 million from the issuance
of common stock to employees through its stock option and employee stock
purchase plans.

     Net cash provided by financing activities during fiscal 1998 of $10.1
million was primarily due to the issuance of common stock to employees through
its stock option and employee stock purchase plans of $38.9 million, offset in
part by payments to TSMC of $17.7 million on the short-term note, payments on
debt of $3.4 million, and repurchases of common stock of $7.7 million.

     Net cash provided by financing activities during fiscal 1997 was $202.6
million. During fiscal 1997, the Company issued $230.0 million of 4 3/4%
Convertible Subordinated Notes due February 1, 2004, for which the Company
received net proceeds of $223.9 million. The notes provide for semi-annual
interest payments each February 1 and August 1, which commenced on August 1,
1997. The holders of the notes are entitled to convert the notes into common
stock at a conversion price of $51.66 per share through February 1, 2004. The
notes are redeemable, in whole or in part, at the option of the Company, at any
time on or after February 3, 2000 at declining premiums to par. Debt issuance
costs are being amortized ratably over the term of the notes. The Company paid a
$46.2 million short-term note issued to TSMC in connection with an agreement to
ensure increased wafer capacity for future technology. The Company also received
proceeds from the issuance of common stock to employees through its stock option
and employee stock purchase plans of $28.3 million.

     STOCK REPURCHASES. In fiscal 1999, the Company repurchased 12,931,000
shares of its common stock at an average price of $15.48 for a total cash outlay
of $200.2 million. In fiscal 1998, the Company repurchased 350,000 shares of its
common stock at an average price of $22.19 for a total cash outlay of $7.7
million. In May 1999, the Company's Board of Directors authorized the Company to
repurchase an additional $200.0 million of its common stock in the open market.

     LINES OF CREDIT. During fiscal 1999, the Company terminated its unsecured
$17.0 million revolving line of credit and a $6.8 million line of credit assumed
in conjunction with the fiscal 1999 first quarter purchase of Ridge and obtained
an unsecured $60.0 million revolving line of credit which expires on March 25,
2000.

     LIQUIDITY. As of March 31, 1999, the Company's principal sources of
liquidity consist of $743.9 million of cash, cash equivalents and marketable
securities and an unsecured $60.0 million revolving line of credit, under which
there were no outstanding borrowings as of March 31, 1999. The Company believes
existing working capital, together with expected cash flows from operations and
available sources of bank, equity and equipment financing, will be sufficient to
support its operations through fiscal 2000.

CHANGE IN ACCOUNTING POLICY

     On November 20, 1997, the Emerging Issues Task Force ("EITF") of the
Financial Accounting Standards Board issued EITF 97-13, "Accounting for Costs
Incurred in Connection with a Consulting Contract that Combines Business Process
Reengineering and Information Technology Transformation." EITF 97-13 requires
that business process reengineering costs incurred in connection with an overall
information technology transformation project be expensed as incurred. The
transition provisions of EITF 97-13 require that companies that had previously
capitalized such business process reengineering costs charge off any unamortized
amounts as a cumulative effect of a change in accounting principle. In fiscal
1998, the cumulative effect of the change to the Company was to decrease net
income by $9.0 million (net of tax benefit of $3.0 million).

RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS

     In June 1998, the Financial Accounting Standards Board issued Statement of
Financial Accounting Standards No. 133, ("SFAS 133") "Accounting for Derivative
Instruments and Hedging Activities." SFAS 133 establishes accounting and
reporting standards for derivative instruments and for hedging activities and
requires recognition of all derivatives as assets or liabilities and measurement
of those instruments at fair value. This statement is effective for fiscal years
beginning after June 15, 2000. The Company will adopt this statement in the
first quarter of fiscal 2001 but does not expect the adoption of SFAS 133 to
have a material impact on the Company's financial position or results of
operations.

                                       28
<PAGE>   29

YEAR 2000

     The inability of computers, software and other equipment utilizing
microprocessors to recognize and properly process data fields containing a
2-digit year is commonly referred to as the Year 2000 Compliance issue. As the
year 2000 approaches, such systems may be unable to accurately process certain
date-based information.

     During fiscal 1998, the Company completed implementation of Enterprise
Resource Planning ("ERP") software to replace the Company's core business
applications, which support sales and customer service, manufacturing,
distribution, and finance and accounting. The ERP software was selected not only
because it was Year 2000 Compliant, but more importantly, to add functionality
and efficiency to the business processes of the Company. The Company completed
Year 2000 testing of the ERP software and is satisfied that it will not present
any Year 2000 Compliance issues.

     In the first half of fiscal 1998, the Company also began a project to
analyze and assess the remainder of its business not addressed by the ERP
software such as other computer and network hardware and software, production
process controllers and related manufacturing equipment. Internal and external
resources are being used to complete any required modification and tests for
Year 2000 Compliance. Furthermore, with the replacement or upgrade of its
internal use software, which is primarily commercial off-the-shelf software, and
non-compatible hardware, the Company believes that the Year 2000 Compliance
issue will not pose significant operational problems for the Company or its
customers.

     The Company presently believes that its products are Year 2000 Compliant.
The majority of the Company's products are not date sensitive. However, for
those products that are date sensitive, the Company, as a standard part of its
product development cycle, has had procedures, tests, and methodologies that
have been in effect since fiscal 1997 to ensure each product's Year 2000
Compliance readiness.

     In addition, the Company has defined its critical suppliers and
communicated with them to determine their Year 2000 Compliance readiness and the
extent to which the Company is vulnerable to any third party Year 2000 issues.
However, there can be no guarantee that the systems of other companies on which
the Company's operations rely will be remediated in a timely manner, or that a
failure to become Year 2000 Compliant by another company, or a conversion that
is incompatible with the Company's systems, would not have a material adverse
effect on the Company.

     Our costs to date related to the Year 2000 Compliance issue consist
primarily of reallocation of internal resources to evaluate and assess systems
and products as described above and to plan our testing and remediation efforts.
The total cost to the Company of Year 2000 Compliance activities has not been
and is not anticipated to be material to its financial position or results of
operations in any given year (less than $1.0 million). Such costs exclude costs
to implement the ERP system and the reallocation of internal resources, as these
costs are not considered incremental to the Company. These costs and the date on
which the Company plans to complete the Year 2000 Compliance remediation and
testing processes are based on management's best estimates, which were derived
utilizing various assumptions of future events including the continued
availability of certain resources, third party modification plans and other
factors. However, there can be no guarantee that these estimates will be
achieved and actual results could differ from those plans.

     The Company has developed a contingency plan for some of its applications
and systems to address any of the consequences of internal or external failures
to be Year 2000 Compliant. It is also in the process of creating a contingency
plan for internal and external sources, including key suppliers, which it
expects to complete in the first half of fiscal 2000.

ITEM 7A. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

     At March 31, 1999, the Company's investment portfolio consisted of fixed
income securities, excluding those classified as cash equivalents, of $426.3
million (See "Note 2. Marketable Securities" of the Notes to Consolidated
Financial Statements on page F-8 for further information). These securities are
subject to interest rate risk and will decline in value if market interest rates
increase. If market interest rates were to

                                       29
<PAGE>   30

increase immediately and uniformly by 10% from levels as of March 31, 1999, the
decline in the fair value of the portfolio would not be material.

     The Company's long-term debt bears interest at a fixed rate. Accordingly,
an immediate 10% change in interest rates would not result in the Company's
long-term debt having any effect on the Company's results of operations.

     On occasion, the Company enters into forward exchange contracts to hedge
certain firm commitments denominated in foreign currencies. The Company does not
use derivative financial instruments for trading or speculative purposes.
Forward exchange contracts are denominated in the same currency as the
underlying transaction (primarily Singapore dollars) and the terms of the
forward foreign exchange contracts generally match the terms of the underlying
transactions. The effect of an immediate 10% change in exchange rates on the
forward exchange contracts would not be material to the Company's financial
condition or results of operations, as there were no forward exchange contracts
outstanding as of March 31, 1999.

ITEM 8. FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

     See the index appearing under Item 14(a)(1) on page 31 for the Consolidated
Financial Statements of Adaptec, Inc. at March 31, 1999 and 1998 and for each of
the three years in the period ended March 31, 1999 and the Report of Independent
Accountants.

ITEM 9. CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND
FINANCIAL DISCLOSURE

     None.

                                    PART III

ITEM 10. DIRECTORS AND EXECUTIVE OFFICERS OF THE REGISTRANT

     Information with respect to directors of Adaptec is incorporated by
reference from the information under the captions: "Election of
Directors -- Nominees" and "Section 16(a) Beneficial Ownership Reporting
Compliance" in the Company's definitive Proxy Statement for the Annual Meeting
of Stockholders to be held, September 9, 1999 (the "Proxy Statement").
Information with respect to the executive officers of Adaptec is included in
Part I of this Form 10-K under the heading "Executive Officers".

ITEM 11. EXECUTIVE COMPENSATION

     Incorporated by reference from the information under the caption:
"Executive Compensation and Other Matters" and "Election of Directors -- Certain
Transactions" in the Company's Proxy Statement.

ITEM 12. SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT

     Incorporated by reference from the information under the caption: "Election
of Directors -- Security Ownership of Management; Principal Stockholders" in the
Company's Proxy Statement.

ITEM 13. CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS

     Incorporated by reference from the information under the caption: "Election
of Directors -- Certain Transactions" in the Company's Proxy Statement.

                                       30
<PAGE>   31

                                    PART IV

ITEM 14. EXHIBITS, FINANCIAL STATEMENT SCHEDULES AND REPORTS ON FORM 8-K

     The following Consolidated Financial Statements of Adaptec, Inc. and the
Report of Independent Accountants, as listed under (a)(1) below, are included in
this document.

(a)(1) FINANCIAL STATEMENTS:

<TABLE>
<CAPTION>
                                                                 PAGE
                                                              -----------
<S>                                                           <C>
Consolidated Statements of Operations -- Fiscal Years ended
  March 31, 1999, 1998, and 1997............................          F-1
Consolidated Balance Sheets at March 31, 1999 and 1998......          F-2
Consolidated Statements of Cash Flows -- Fiscal Years ended
  March 31, 1999, 1998, and 1997............................          F-3
Consolidated Statements of Stockholders' Equity -- Fiscal
  Years ended March 31, 1999, 1998, and 1997................          F-4
Notes to Consolidated Financial Statements..................  F-5 to F-30
Report of Management........................................         F-31
Report of Independent Accountants...........................         F-32
</TABLE>

(2) All schedules are omitted because they are not applicable or the required
    information is shown in the consolidated financial statements or notes
    thereto.

(3) Exhibits included herein (numbered in accordance with Item 601 of Regulation
    S-K):

<TABLE>
<CAPTION>
EXHIBIT
NUMBER                           DESCRIPTION                           NOTES
- -------                          -----------                           -----
<S>      <C>                                                           <C>
 2.1     Agreement for Purchase and Sale of Stock by and among
         Western Digital Corporation, Western Digital CSG
         Corporation, and Adaptec, Inc. dated April 9, 1996.             (3)
 2.2     Agreement and Plan of Reorganization by and among Adaptec,
         Inc., Adaptec Acquisition Corporation, and Data Kinesis,
         Inc. dated August 6, 1996.                                      (4)
 2.3     Asset Acquisition Agreement by and among Adaptec, Inc. and
         Analog Devices, Inc. dated March 24, 1998                      (16)
 2.4     Agreement and Plan of Reorganization by and among Adaptec,
         Inc., Ridge Technologies and RDS Acquisition (as of May 21,
         1998).                                                         (16)
 2.5     Agreement and Plan of Merger dated February 23, 1998 between
         Registrant and Adaptec, Inc., a California corporation.        (16)
 2.6     Asset Purchase Agreement between Texas Instruments,
         Incorporated and Adaptec, Inc. dated November 6, 1998.         (14)
 2.7     Asset Acquisition Agreement among Adaptec, Inc., Adaptec
         Mfg. (s) Pte. Ltd. And STMicroelectronics, Inc. dated
         January 15, 1999.                                              (14)
 2.8     Amendment No. 1 to Asset Acquisition Agreement among
         Adaptec, Inc., Adaptec Mfg. (s) Pte. Ltd. and
         STMicroelectronics, Inc. dated January 15, 1999.               (14)
 3.1     Certificate of Incorporation of Registrant filed with
         Delaware Secretary of State on November 19, 1997.              (16)
 3.2     Bylaws of Registrant, as amended on June 29, 1999.
 4.1     Second Amended and Restated Rights Agreement dated December
         5, 1996 between Registrant and Chase Mellon Shareholder
         Services, Inc. as Rights Agents.                                (8)
 4.2     First Amendment dated March 12, 1998 to Second Amended and
         Restated Rights Agreement.                                     (16)
 4.3     Indenture dated as of February 3, 1997 between Registrant
         and State Street Bank and Trust Company.                        (1)
</TABLE>

                                       31
<PAGE>   32

<TABLE>
<CAPTION>
EXHIBIT
NUMBER                           DESCRIPTION                           NOTES
- -------                          -----------                           -----
<S>      <C>                                                           <C>
 4.4     First Supplemental indenture dated as of March 12, 1998
         between Registrant and State Street Bank and Trust Company.    (16)
10.1+    Registrant's 1986 Employee Stock Purchase Plan.                 (6)
10.2     Technology License Agreement dated January 1, 1985 between
         the Registrant and International Business Machines
         Corporation.                                                   (10)
10.3+    Registrant's Savings and Retirement Plan.                       (9)
10.4+    1990 Stock Plan, as amended.                                   (12)
10.5+    Forms of Stock Option Agreement, Tandem Stock Option/SAR
         Agreement, Restricted Stock Purchase Agreement, Stock
         Appreciation Rights Agreement, and Incentive Stock Rights
         Agreement for use in connection with the 1990 Stock Plan, as
         amended.                                                        (7)
10.6+    1990 Directors' Option Plan and forms of Stock Option
         Agreement, as amended.
10.7     Option Agreement I Between Adaptec Manufacturing (S) Pte.
         Ltd. and Taiwan Semiconductor Manufacturing Co., Ltd. dated
         October 23, 1995.                                               (2)
10.8*    Option Agreement II Between Adaptec Manufacturing (S) Pte.
         Ltd. and Taiwan Semiconductor Manufacturing Co., Ltd. dated
         October 23, 1995.                                               (2)
10.9     Consignment Agreement between Adaptec, Inc. and AT&T Corp.
         dated January 10, 1996.                                         (2)
10.10    Form of Indemnification Agreement entered into with
         directors and officers of Adaptec, Inc., a California
         corporation, prior to Registrant's reincorporation into
         Delaware.                                                      (11)
10.11    Form of Indemnification Agreement entered into between
         Registrant and its officers and directors.                     (16)
10.12    Deposit and Supply Agreement between Taiwan Semiconductor
         Manufacturing Co., Ltd. and Adaptec Manufacturing Pte. Ltd.     (6)
10.13    Industrial Lease Agreement between the Registrant, as
         Lessee, and Jurong Town Corporation, as Lessor.                 (5)
10.14    Amendment No. 1 to Option Agreement III between Adaptec
         Manufacturing (s) Pte. Ltd. And Taiwan Semiconductor
         Manufacturing Co. Ltd.                                         (13)
10.15    Termination of Option III agreement between Adaptec
         Manufacturing (s) Pte. Ltd. and Taiwan Semiconductor
         Manufacturing Co. Ltd.                                         (15)
10.16**  Amendment to Option Agreements I & II between Taiwan
         Semiconductor Manufacturing Co., Ltd. and Adaptec,
         Manufacturing (s) Pte. Ltd.
10.17    Modification to Amendment to Option Agreement I & II between
         Taiwan Semiconductor Manufacturing Co., Ltd. and Adaptec,
         Manufacturing (s) Pte. Ltd.
21.1     Subsidiaries of Registrant.
23.1     Consent of Independent Accountants, PricewaterhouseCoopers
         LLP. (See Page 34)
24.1     Power of Attorney. (See Page 36)
27.1     Financial Data Schedule for the year ended March 31, 1999.
27.2     Financial Data Schedule for the year ended March 31, 1998.
</TABLE>

                                       32
<PAGE>   33

<TABLE>
<CAPTION>
EXHIBIT
NUMBER                           DESCRIPTION                           NOTES
- -------                          -----------                           -----
<S>      <C>                                                           <C>
27.3     Financial Data Schedule for the year ended March 31, 1997.
</TABLE>

- ---------------
 (1) Incorporated by reference to exhibits filed with Registrant's Registration
     Statement Number 333-24557 on Form S-1 on April 4, 1997.

 (2) Incorporated by reference to exhibits filed with Registrant's Annual Report
     on Form 10-K for the year ended March 31, 1996.

 (3) Incorporated by reference to exhibits filed with Registrant's Quarterly
     Report on Form 10-Q for the quarter ended June 28, 1996.

 (4) Incorporated by reference to exhibits filed with Registrant's Quarterly
     Report on Form 10-Q for the quarter ended September 27, 1996.

 (5) Incorporated by reference to exhibits filed with Registrant's Annual Report
     on Form 10-K for the year ended March 31, 1995.

 (6) Incorporated by reference to exhibits filed with Registrant's Annual Report
     on Form 10-K for the year ended March 31, 1994.

 (7) Incorporated by reference to exhibits filed with Registrant's Annual Report
     on Form 10-K for the year ended March 31, 1993.

 (8) Incorporated by reference to Exhibit 1 filed with Amendment No. 4 to
     Registrant's Registration Statement Number 0-15071 on Form 8-A as filed on
     January 4, 1997.

 (9) Incorporated by reference to exhibits filed with Registrant's Annual Report
     on Form 10-K for the fiscal year ended March 31, 1987.

(10) Incorporated by reference to Exhibit 10.15 filed in response to Item 16(a)
     "Exhibits," of Registrant's Registration Statement on Form S-1 and
     Amendment No. 1 and Amendment No. 2 thereto (file No. 33-5519), which
     became effective on June 11, 1986.

(11) Incorporated by reference to exhibits filed with Registrant's Annual Report
     on Form 10-K for the fiscal year ended March 31, 1992.

(12) Incorporated by reference to Exhibit 4.2 to Form 10-Q as filed February 7,
     1996.

(13) Incorporated by reference to Exhibit 10.1 to Form 10-Q as filed August 7,
     1998.

(14) Incorporated by reference to Exhibits 2.1, 2.2, 2.3, respectively, to Form
     8-K as filed January 29, 1999.

(15) Incorporated by reference to Exhibit 10.1 to Form 10-Q as filed February
     12, 1999.

(16) Incorporated by reference to exhibits filed with the Registrant's Annual
     Report on Form 10-K for the year ended March 31, 1998.

  +  Management contract or compensatory plan or arrangement required to be
     filed as an exhibit to this Form 10-K pursuant to Item 14(c) of said form.

  *  Confidential treatment has been granted for portions of this agreement.

 **  Confidential treatment has been requested for portions of this agreement.

 (b) REPORTS ON FORM 8-K

     During the fourth quarter ended March 31, 1999, the Company filed the
following current Reports on Form 8-K:

     On January 29, 1999, pursuant to Item 2 thereof, to report the disposition
of the Peripheral Technology Solutions segment.

                                       33
<PAGE>   34

                                                                    EXHIBIT 23.1

                       CONSENT OF INDEPENDENT ACCOUNTANTS

     We hereby consent to the incorporation by reference in the Registration
Statements on Form S-8 (No. 333-77321, No. 333-66151, No. 33-02889, No.
333-00779, No. 33-43591, No. 333-14241, and No. 333-12095) and Form S-1 (No.
333-24557) of Adaptec, Inc. and its subsidiaries of our report dated April 28,
1999, relating to the Financial Statements, which appears in this Annual Report
on Form 10-K.

/s/  PricewaterhouseCoopers LLP
- ---------------------------------------------
PricewaterhouseCoopers LLP
San Jose, California
June 29, 1999

                                       34
<PAGE>   35

                                   SIGNATURES

     Pursuant to the requirements of Section 13 or 15(d) of the Securities
Exchange Act of 1934, the Registrant has duly caused this Report to be signed on
its behalf by the undersigned, thereunto duly authorized.

ADAPTEC, INC.

/s/ ROBERT N. STEPHENS
- --------------------------------------
Robert N. Stephens
President and Chief Executive Officer

Date: June 29, 1999

                                       35
<PAGE>   36

                               POWER OF ATTORNEY

     KNOW ALL PERSONS BY THESE PRESENT, that each person whose signature appears
below constitutes and appoints Robert N. Stephens and Andrew J. Brown, jointly
and severally, his attorneys-in-fact, each with the power of substitution, for
him in any and all capacities, to sign any amendments to this Report on Form
10-K, 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 of 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 Exchange Act of 1934, this
Report has been signed below by the following persons in the capacities and on
the dates indicated.

<TABLE>
<CAPTION>
                      SIGNATURE                                      TITLE                    DATE
                      ---------                                      -----                    ----
<C>                                                     <S>                               <C>
               /s/ ROBERT N. STEPHENS                   President, Chief Executive        June 29, 1999
- -----------------------------------------------------   Officer
                (Robert N. Stephens)

                 /s/ ANDREW J. BROWN                    Vice President of Finance,        June 29, 1999
- -----------------------------------------------------   Chief Financial Officer
                  (Andrew J. Brown)

                /s/ KENNETH B. AROLA                    Vice President, Corporate         June 29, 1999
- -----------------------------------------------------   Controller and Principal
                 (Kenneth B. Arola)                     Accounting Officer

               /s/ LAURENCE B. BOUCHER                  Chairman                          June 29, 1999
- -----------------------------------------------------
                (Laurence B. Boucher)

                  /s/ JOHN G. ADLER                     Director                          June 29, 1999
- -----------------------------------------------------
                   (John G. Adler)

                  /s/ CARL J. CONTI                     Director                          June 29, 1999
- -----------------------------------------------------
                   (Carl J. Conti)

                  /s/ JOHN C. EAST                      Director                          June 29, 1999
- -----------------------------------------------------
                   (John C. East)

                  /s/ ILENE H. LANG                     Director                          June 29, 1999
- -----------------------------------------------------
                   (Ilene H. Lang)

                /s/ ROBERT J. LOARIE                    Director                          June 29, 1999
- -----------------------------------------------------
                 (Robert J. Loarie)

                   /s/ B. J. MOORE                      Director                          June 29, 1999
- -----------------------------------------------------
                    (B. J. Moore)

               /s/ W. FERRELL SANDERS                   Director                          June 29, 1999
- -----------------------------------------------------
                (W. Ferrell Sanders)

                /s/ PHILLIP E. WHITE                    Director                          June 29, 1999
- -----------------------------------------------------
                 (Phillip E. White)
</TABLE>

                                       36
<PAGE>   37

                                 ADAPTEC, INC.

                     CONSOLIDATED STATEMENTS OF OPERATIONS
                    (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)

<TABLE>
<CAPTION>
                                                                   YEAR ENDED MARCH 31,
                                                            ----------------------------------
                                                              1999         1998         1997
                                                            --------    ----------    --------
<S>                                                         <C>         <C>           <C>
Net revenues..............................................  $692,441    $1,007,293    $933,868
Cost of revenues..........................................   284,503       391,100     388,969
                                                            --------    ----------    --------
  Gross profit............................................   407,938       616,193     544,899
                                                            --------    ----------    --------
Operating expenses:
  Research and development................................   146,172       169,022     128,530
  Sales, marketing, and administrative....................   180,986       215,624     162,979
  Write-off of acquired in-process technology.............    45,482            --      90,457
  Restructuring and other charges.........................    68,788         6,715       1,705
                                                            --------    ----------    --------
          Total operating expenses........................   441,428       391,361     383,671
                                                            --------    ----------    --------
Income (loss) from operations.............................   (33,490)      224,832     161,228
                                                            --------    ----------    --------
Interest and other income.................................    35,059        32,899      13,297
Interest expense..........................................   (12,103)      (12,402)     (2,744)
Gain on sale of PTS.......................................    31,476            --          --
                                                            --------    ----------    --------
Income from operations before provision for income taxes
  and cumulative effect of a change in accounting
  principle...............................................    20,942       245,329     171,781
Provision for income taxes................................    34,235        63,452      64,220
                                                            --------    ----------    --------
Income (loss) before cumulative effect of a change in
  accounting principle....................................   (13,293)      181,877     107,561
Cumulative effect of a change in accounting principle, net
  of tax benefit..........................................        --        (9,000)         --
                                                            --------    ----------    --------
Net income (loss).........................................  $(13,293)   $  172,877    $107,561
                                                            ========    ==========    ========
Net income (loss) per share:
  Basic
     Income (loss) before cumulative effect of a change in
       accounting principle...............................  $  (0.12)   $     1.61    $   0.99
     Cumulative effect of a change in accounting
       principle..........................................        --         (0.08)         --
                                                            --------    ----------    --------
     Net income (loss)....................................  $  (0.12)   $     1.53    $   0.99
                                                            ========    ==========    ========
  Diluted
     Income (loss) before cumulative effect of a change in
       accounting principle...............................  $  (0.12)   $     1.54    $   0.93
     Cumulative effect of a change in accounting
       principle..........................................        --         (0.08)         --
                                                            --------    ----------    --------
     Net income (loss)....................................  $  (0.12)   $     1.46    $   0.93
                                                            ========    ==========    ========
Shares used in computing net income (loss) per share:
  Basic...................................................   110,127       113,172     108,456
  Diluted.................................................   110,127       118,432     115,596
</TABLE>

                            See accompanying notes.

                                       F-1
<PAGE>   38

                                 ADAPTEC, INC.

                          CONSOLIDATED BALANCE SHEETS
                                 (IN THOUSANDS)

                                     ASSETS

<TABLE>
<CAPTION>
                                                                    AS OF MARCH 31,
                                                                ------------------------
                                                                   1999          1998
                                                                ----------    ----------
<S>                                                             <C>           <C>
Current assets:
  Cash and cash equivalents.................................    $  317,580    $  227,183
  Marketable securities.....................................       426,332       470,199
  Accounts receivable, net of allowance for doubtful
     accounts of $1,895 in 1999 and $4,185 in 1998..........        67,158       136,476
  Inventories...............................................        50,838        71,297
  Deferred income taxes.....................................        61,345        46,479
  Prepaid expenses and other................................        86,764        39,460
                                                                ----------    ----------
          Total current assets..............................     1,010,017       991,094
Property and equipment, net.................................       126,734       194,798
Other assets................................................        36,317        89,337
                                                                ----------    ----------
                                                                $1,173,068    $1,275,229
                                                                ==========    ==========

                          LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
  Current portion of long-term debt.........................    $       --    $      850
  Note payable..............................................            --        17,640
  Accounts payable..........................................        39,487        48,047
  Accrued liabilities.......................................       112,879        73,947
                                                                ----------    ----------
          Total current liabilities.........................       152,366       140,484
                                                                ----------    ----------
Long-term debt, net of current portion......................       230,000       230,000
                                                                ----------    ----------
Commitments and contingencies (Note 17)
Stockholders' equity:
  Preferred stock; $0.001 par value
     Authorized shares, 1,000; Series A shares, 250
      designated
     Outstanding shares, none...............................            --            --
  Common stock; $0.001 par value
     Authorized shares, 400,000
     Outstanding shares, 105,507 in 1999 and 113,981 in
      1998..................................................           106           114
  Additional paid-in capital................................       194,521       295,263
  Retained earnings.........................................       596,075       609,368
                                                                ----------    ----------
          Total stockholders' equity........................       790,702       904,745
                                                                ----------    ----------
                                                                $1,173,068    $1,275,229
                                                                ==========    ==========
</TABLE>

                            See accompanying notes.

                                       F-2
<PAGE>   39

                                 ADAPTEC, INC.

                     CONSOLIDATED STATEMENTS OF CASH FLOWS
                                 (IN THOUSANDS)

<TABLE>
<CAPTION>
                                                                  YEARS ENDED MARCH 31,
                                                             --------------------------------
                                                               1999        1998        1997
                                                             --------    --------    --------
<S>                                                          <C>         <C>         <C>
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)..........................................  $(13,293)   $172,877    $107,561
Adjustments to reconcile net income (loss) to net cash
  provided by operating activities:
  Cumulative effect of a change in accounting principle,
     net of taxes..........................................        --       9,000          --
  Write-off of acquired in-process technology, net of
     taxes.................................................    45,482          --      88,691
  Non-cash charges associated with restructuring and other
     charges...............................................    22,920       6,715          --
  Gain on sale of PTS......................................   (31,476)         --          --
  Depreciation and amortization............................    50,166      42,896      28,611
  Provision for doubtful accounts..........................     1,258       4,000       1,000
  Deferred income taxes....................................   (14,866)    (14,497)    (13,896)
  Income tax benefit of employees' stock transactions......    18,157      12,390      22,144
  Changes in assets and liabilities:
     Accounts receivable...................................    68,060     (17,173)    (36,984)
     Inventories...........................................    16,836     (18,113)     11,998
     Prepaid expenses and other............................    16,440      21,578      (3,878)
     Other assets..........................................     2,556      21,339       3,329
     Accounts payable......................................   (10,753)     (4,353)     25,968
     Accrued liabilities...................................    36,193       8,428      10,948
                                                             --------    --------    --------
Net Cash Provided by Operating Activities..................   207,680     245,087     245,492
                                                             --------    --------    --------
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of certain net assets in connection with
  acquisitions, net........................................   (34,126)         --    (107,214)
Proceeds from the sale of PTS, net.........................    75,999          --          --
Investments in property and equipment, net.................   (30,347)    (97,699)    (87,959)
Decreases (increases) in marketable securities, net........    43,867    (239,833)    (26,083)
Purchase of minority investments...........................        --      (8,560)         --
                                                             --------    --------    --------
Net Cash Provided by (Used for) Investing Activities.......    55,393    (346,092)   (221,256)
                                                             --------    --------    --------
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of convertible debt.................        --          --     223,905
Payments of short-term note................................        --     (17,640)    (46,200)
Proceeds from issuance of common stock.....................    33,098      38,921      28,323
Repurchases of common stock................................  (200,224)     (7,768)         --
Principal payments on debt.................................    (5,550)     (3,400)     (3,400)
                                                             --------    --------    --------
Net Cash Provided by (Used for) Financing Activities.......  (172,676)     10,113     202,628
                                                             --------    --------    --------
Net Increase (Decrease) in Cash and Cash Equivalents.......    90,397     (90,892)    226,864
  Cash and Cash Equivalents at Beginning of Year...........   227,183     318,075      91,211
                                                             --------    --------    --------
  Cash and Cash Equivalents at End of Year.................  $317,580    $227,183    $318,075
                                                             ========    ========    ========
Supplemental Disclosures of Cash Flows:
Interest paid..............................................  $ 11,100    $ 11,218    $    641
Income taxes paid..........................................    14,963      58,537      67,118
Income tax refund received.................................    23,746          --          --
</TABLE>

                            See accompanying notes.

                                       F-3
<PAGE>   40

                                 ADAPTEC, INC.

                CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY
                                 (IN THOUSANDS)

<TABLE>
<CAPTION>
                                           COMMON STOCK       ADDITIONAL
                                         -----------------     PAID-IN      RETAINED
                                         SHARES     AMOUNT     CAPITAL      EARNINGS     TOTAL
                                         -------    ------    ----------    --------    --------
<S>                                      <C>        <C>       <C>           <C>         <C>
BALANCE, MARCH 31, 1996................  106,040     $106      $182,826     $329,013    $511,945
Sale of common stock under employee
  purchase and option plans............    2,814        3        28,320           --      28,323
Issuance of common stock in connection
  with acquisition.....................    2,686        3        18,432          (83)     18,352
Income tax benefit of employees' stock
  transactions.........................       --       --        22,144           --      22,144
Net income.............................       --       --            --      107,561     107,561
                                         -------     ----      --------     --------    --------
BALANCE, MARCH 31, 1997................  111,540      112       251,722      436,491     688,325
Sale of common stock under employee
  purchase and option plans............    2,791        3        38,918           --      38,921
Income tax benefit of employees' stock
  transactions.........................       --       --        12,390           --      12,390
Repurchases of common stock............     (350)      (1)       (7,767)          --      (7,768)
Net income.............................       --       --            --      172,877     172,877
                                         -------     ----      --------     --------    --------
BALANCE, MARCH 31, 1998................  113,981      114       295,263      609,368     904,745
Sale of common stock under employee
  purchase and option plans............    3,250        3        33,095           --      33,098
Issuance of common stock in connection
  with acquisition.....................    1,207        2        34,339           --      34,341
Stock-based compensation charges.......       --       --        13,878           --      13,878
Income tax benefit of employees' stock
  transactions.........................       --       --        18,157           --      18,157
Repurchases of common stock............  (12,931)     (13)     (200,211)          --    (200,224)
Net loss...............................       --       --            --      (13,293)    (13,293)
                                         -------     ----      --------     --------    --------
BALANCE, MARCH 31, 1999................  105,507     $106      $194,521     $596,075    $790,702
                                         =======     ====      ========     ========    ========
</TABLE>

                            See accompanying notes.

                                       F-4
<PAGE>   41

                                 ADAPTEC, INC.

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

NOTE 1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

BASIS OF PRESENTATION

     The consolidated financial statements include the accounts of the Company
and its wholly owned subsidiaries after elimination of intercompany transactions
and balances. 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 consolidated financial
statements and accompanying notes. Actual results could differ from those
estimates. In November 1996, the Company effected a two for one split of its
common stock. In March 1998, the Company was reincorporated in the State of
Delaware. The accompanying consolidated financial statements have been
retroactively restated to reflect the stock split and give effect to the
reincorporation. Additionally, certain items previously reported in specific
financial statement captions have been reclassified to conform with current
presentation.

FOREIGN CURRENCY TRANSLATION

     For foreign subsidiaries whose functional currency is the local currency,
the Company translates assets and liabilities to U.S. dollars using year end
exchange rates and translates revenues and expenses using average exchange rates
during the year. Exchange gains and losses arising from translation of foreign
entity financial statements have not been material to the Company's operating
results in the periods presented.

     For foreign subsidiaries whose functional currency is the U.S. dollar,
certain assets and liabilities are remeasured at the year end or historical
rates as appropriate. Revenues and expenses are remeasured at the average rates
during the year. Currency transaction gains and losses are recognized in current
operations and have not been material to the Company's operating results in the
periods presented.

CASH EQUIVALENTS AND MARKETABLE SECURITIES

     Cash equivalents consist of highly liquid investments with original
maturities of three months or less. The Company's marketable securities are
classified as available-for-sale and, at the balance sheet date, are reported at
fair market value which approximates cost.

CONCENTRATION OF CREDIT RISK

     Financial instruments that potentially subject the Company to significant
concentrations of credit risk consist principally of cash and cash equivalents,
marketable securities, and trade accounts receivable. The Company invests in
marketable securities including municipal bonds, corporate bonds and government
securities, all of which are of high investment grade. The Company, by policy,
limits the amount of credit exposure through diversification and investment in
highly rated securities. Sales to customers are denominated in U.S. dollars. As
a result, the Company believes its foreign currency risk is minimal.

     The Company sells its products to original equipment manufacturers ("OEMs")
and distributors throughout the world. The Company performs ongoing credit
evaluations of its customers' financial condition and, generally, requires no
collateral from its customers. The Company maintains an allowance for doubtful
accounts based upon the expected collectibility of all accounts receivable.
During fiscal 1998, the Company increased its allowance for bad debt due to
adverse business conditions in the disk drive market. Otherwise, the Company has
historically not experienced significant losses from its accounts receivable.
The Company wrote-off $3.5 million, $4.9 million and $0.1 million of its
accounts receivable in fiscal 1999, 1998 and 1997, respectively.

DERIVATIVE FINANCIAL INSTRUMENTS

     The Company enters into foreign currency contracts in order to reduce the
impact of certain foreign currency fluctuations. Certain firmly committed
transactions denominated in foreign currencies are occasion-

                                       F-5
<PAGE>   42
                                 ADAPTEC, INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

ally hedged with forward exchange contracts. Gains and losses related to hedges
of firmly committed transactions are deferred and recognized as income when the
hedged transaction occurs and have been less than $1.0 million for the periods
presented. At March 31, 1999 and 1998, the Company had forward exchange
contracts outstanding with a notional amount of $0.0 million and $7.7 million,
respectively, to hedge the exposure associated with a firm, fixed liability to
construct an office facility in Singapore. The Company does not hold or issue
derivative financial instruments for trading or speculative purposes. The
amounts potentially subject to credit risk relating to forward exchange
contracts, arising from the possible inability of counterparties to meet the
terms of their contracts, are generally limited to the amounts, if any, by which
the counterparties' obligations exceed the obligations of the Company. The
Company controls credit risk through credit approvals, limits and monitoring
procedures.

FAIR VALUE OF FINANCIAL INSTRUMENTS

     For certain of the Company's financial instruments, including cash and cash
equivalents, marketable securities, accounts receivable, notes payable and
accounts payable, the carrying amounts approximate fair value due to their short
maturities. The estimated fair value of the Company's 4 3/4% Convertible
Subordinated Notes was $190.4 million and $190.6 million at March 31, 1999 and
1998, respectively, and is based on quoted market prices. The estimated fair
value of the Company's forward exchange contracts was $7.9 million at March 31,
1998. The Company had no forward exchange contracts outstanding at March 31,
1999.

INVENTORIES

     Inventories are stated at the lower of cost (first-in, first-out) or
market.

PROPERTY AND EQUIPMENT

     Property and equipment are stated at cost and depreciated or amortized
using the straight-line method over the estimated useful lives of the assets.
The Company capitalizes substantially all costs related to the purchase and
implementation of software projects used for internal business operations,
excluding business process reengineering costs as defined by Emerging Issues
Task Force ("EITF") 97-13. Capitalized internal-use software costs primarily
include licenses fees, consulting fees and any associated direct labor and are
amortized over the estimated useful life of the project, typically a three to
five year period. In fiscal 1997 and 1998, the Company implemented Enterprise
Resource Planning ("ERP") software. Subsequently, costs related to the purchase
and implementation of software projects has been immaterial to the Company's
financial position.

CHANGE IN ACCOUNTING POLICY FOR BUSINESS PROCESS REENGINEERING COSTS

     On November 20, 1997, the EITF of the Financial Accounting Standards Board
issued EITF 97-13, "Accounting for Costs Incurred in Connection with a
Consulting Contract that Combines Business Process Reengineering and Information
Technology Transformation." EITF 97-13 requires that business process
reengineering costs incurred in connection with an overall information
technology transformation project be expensed as incurred. The transition
provisions of EITF 97-13 require that companies that had previously capitalized
such business process reengineering costs charge off any unamortized amounts as
a cumulative effect of a change in accounting principle. In fiscal 1998, the
cumulative effect of the change to the Company was to decrease net income by
$9.0 million (net of tax benefit of $3.0 million).

PRODUCT DEVELOPMENT COSTS

     The Company's policy is to capitalize internal software development costs
incurred after technological feasibility has been demonstrated. Such internal
software development costs have not been material to date.

                                       F-6
<PAGE>   43
                                 ADAPTEC, INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

OTHER ASSETS

     The Company's other assets include goodwill, minority investments and
long-term advance payments to Taiwan Semiconductor Manufacturing Co., Ltd..
("TSMC"). Amortization totaling $12.6 million, $10.4 million and $6.4 million
was included in the Company's consolidated statements of operations during 1999,
1998 and 1997, respectively. During fiscal 1999, the Company wrote-off $1.4
million of goodwill associated with restructuring activities and relieved $24.8
million of goodwill associated with the sale of the Peripheral Technology
Solutions ("PTS") segment (Notes 10 and 13). Goodwill and minority investments
are evaluated periodically for potential impairment based on the future
estimated cash flows of the acquired technology or investment. The advance
payments to TSMC were made in exchange for guaranteed wafer fabrication capacity
through December 31, 2002 (Note 6). As wafers are purchased and received from
TSMC, the advance payments are relieved and capitalized into inventory. The
Company classifies only those payments expected to be converted into inventory
within one year as current assets and the remaining payments are classified as
other assets. The TSMC balance is evaluated periodically for potential
impairment based on future production requirements. No impairments have been
identified or recorded in any period presented.

REVENUE RECOGNITION

     The Company recognizes revenue from its product sales, including software
sales, upon satisfaction of contractual obligations, which is generally at the
time of shipment. The Company records provisions for estimated returns and
allowances at the time of shipment.

STOCK-BASED COMPENSATION

     The Company accounts for stock-based compensation using the intrinsic value
method prescribed in Accounting Principles Board Opinion No. 25 ("APB 25"),
"Accounting for Stock Issued to Employees." The Company's policy is to grant
options with an exercise price equal to the quoted market price of the Company's
stock on the grant date. Accordingly, no compensation cost has been recognized
in the Company's Consolidated Statements of Operations, except as described in
Notes 10 and 11 relating to restructuring and other charges. The Company has
provided additional pro forma disclosures as required under Statement of
Financial Accounting Standards No. 123 ("SFAS 123"), "Accounting for Stock-Based
Compensation" in Note 15.

COMPREHENSIVE INCOME

     As of April 1, 1998, the Company adopted Statement of Financial Accounting
Standards No. 130 ("SFAS 130"), "Reporting Comprehensive Income". SFAS 130
establishes new rules for the reporting and display of comprehensive income and
its components, however, the adoption of this statement has no impact on the
Company's net income (loss) or stockholders' equity. It requires components of
comprehensive income, including unrealized gains or losses on the Company's
available-for-sale securities and foreign currency translation adjustments, to
be reported in the financial statements. These amounts are not material to the
Company's financial statements for the periods presented.

RECENT ACCOUNTING PRONOUNCEMENTS

     In June 1998, the Financial Accounting Standards Board issued Statement of
Financial Accounting Standards No. 133 ("SFAS 133"), "Accounting for Derivative
Instruments and Hedging Activities." SFAS 133 established accounting and
reporting standards for derivative instruments and for hedging activities and
requires recognition of all derivatives as assets or liabilities and measurement
of those instruments at fair value. This statement is effective for fiscal years
beginning after June 15, 2000. The Company will adopt this statement in the
first quarter of fiscal 2001 but does not expect the adoption of SFAS 133 to
have a material impact on the Company's financial position, results of
operations or cash flows.

                                       F-7
<PAGE>   44
                                 ADAPTEC, INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

ACQUIRED IN-PROCESS TECHNOLOGY

     The Company reduced its estimate of the amount allocated to acquired
in-process technology from the purchase of read channel and preamplifier ASIC
technologies ("ASIC technologies") from Analog Devices, Inc. ("ADI") by $20.3
million, from $26.4 million previously reported in the first quarter of fiscal
1999 to $6.1 million. Amortization of intangibles increased approximately $1.7
million in each of the first three quarters of fiscal 1999 from $7.5 million to
$12.6 million for the year ended March 31, 1999. In the fourth quarter of fiscal
1999, the Company relieved the unamortized goodwill associated with ASIC
technologies purchased from ADI in connection with the sale of the Company's
mainstream removable PTS business line. The Company reduced the gain originally
reported in the Company's Form 8-K dated January 15, 1999 by $14.0 million from
$46.5 million previously reported, to $31.5 million for the fourth quarter and
year ended March 31, 1999. Basic and diluted net income (loss) per share for the
four quarters of fiscal 1999 were impacted by the restatement, however, there
was no impact on fiscal 1999 year-to-date basic or diluted net loss per share.
Additionally, there will be no impact on future results of operations as the
goodwill associated with ASIC technologies purchased from ADI was relieved in
the fourth quarter of fiscal 1999. The adjustments described above have been
reflected in the Company's Consolidated Financial Statements and related notes
for the year ended March 31, 1999. Further discussion of the analysis and
adjustment of amounts allocated to acquired in-process technology is included in
Note 9.

NOTE 2. MARKETABLE SECURITIES

     The Company's portfolio of marketable securities consists of the following:

<TABLE>
<CAPTION>
                                                                1999        1998
                                                              --------    --------
                                                                 (IN THOUSANDS)
<S>                                                           <C>         <C>
Municipal bonds.............................................  $148,898    $186,346
Corporate bonds.............................................    97,176     185,665
U.S. government securities..................................   180,258      98,188
                                                              --------    --------
                                                              $426,332    $470,199
                                                              ========    ========
</TABLE>

     At March 31, 1999 and 1998, the net unrealized holding gains and losses on
securities were immaterial. The marketable securities at March 31, 1999 and 1998
by contractual maturity are shown below:

<TABLE>
<CAPTION>
                                                                1999        1998
                                                              --------    --------
                                                                 (IN THOUSANDS)
<S>                                                           <C>         <C>
Mature in one year or less..................................  $254,539    $216,252
Mature after one year through three years...................   171,793     253,947
                                                              --------    --------
                                                              $426,332    $470,199
                                                              ========    ========
</TABLE>

     At March 31, 1999, marketable securities totaling $189.7 million were
classified as cash equivalents and included municipal bonds, corporate bonds and
U.S. government securities of $2.6 million, $28.7 million and $158.4 million,
respectively. At March 31, 1998, marketable securities totaling $175 million
were classified as cash equivalents and included municipal bonds, corporate
bonds and U.S. government securities of $6 million, $13 million and $156
million, respectively.

                                       F-8
<PAGE>   45
                                 ADAPTEC, INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

NOTE 3. BALANCE SHEET DETAIL

INVENTORY

<TABLE>
<CAPTION>
                                                               1999       1998
                                                              -------    -------
                                                                (IN THOUSANDS)
<S>                                                           <C>        <C>
Raw materials...............................................  $16,354    $17,728
Work-in-process.............................................    8,202     18,415
Finished goods..............................................   26,282     35,154
                                                              -------    -------
                                                              $50,838    $71,297
                                                              =======    =======
</TABLE>

PROPERTY AND EQUIPMENT

<TABLE>
<CAPTION>
                                                      LIFE           1999        1998
                                                  -------------    --------    --------
                                                                      (IN THOUSANDS)
<S>                                               <C>              <C>         <C>
Land............................................             --    $ 13,240    $ 41,017
Buildings and improvements......................   5 - 40 years      51,706      50,761
Machinery and equipment.........................    3 - 5 years      86,591     106,173
Furniture and fixtures..........................    3 - 7 years      67,771      69,040
Leasehold improvements..........................  Life of lease       3,300       6,662
Construction in progress........................             --       1,070       4,578
                                                                   --------    --------
                                                                    223,678     278,231
Accumulated depreciation and amortization.......                    (96,944)    (83,433)
                                                                   --------    --------
                                                                   $126,734    $194,798
                                                                   ========    ========
</TABLE>

OTHER ASSETS

<TABLE>
<CAPTION>
                                                               1999       1998
                                                              -------    -------
                                                                (IN THOUSANDS)
<S>                                                           <C>        <C>
TSMC advance payments (Note 6)..............................  $21,148    $63,840
Goodwill, net of accumulated amortization of $7,438 in 1999
  and $19,855 in 1998.......................................    2,238     11,213
Minority investments........................................    6,629      5,100
Other.......................................................    6,302      9,184
                                                              -------    -------
                                                              $36,317    $89,337
                                                              =======    =======
</TABLE>

ACCRUED LIABILITIES

<TABLE>
<CAPTION>
                                                                1999       1998
                                                              --------    -------
                                                                (IN THOUSANDS)
<S>                                                           <C>         <C>
Accrued compensation and related taxes......................  $ 22,137    $25,273
Sales and marketing related.................................     7,708     11,036
Tax related.................................................    65,754     25,208
Other.......................................................    17,280     12,430
                                                              --------    -------
                                                              $112,879    $73,947
                                                              ========    =======
</TABLE>

NOTE 4. LINE OF CREDIT

     In March 1999, the Company obtained an unsecured $60.0 million revolving
line of credit which expires on March 25, 2000. No borrowings were outstanding
under this line of credit as of March 31, 1999. The interest rate and commitment
fee is based on a pricing matrix, which correlates with the Company's credit
rating and market interest rates. Under the arrangement, the Company is required
to maintain certain

                                       F-9
<PAGE>   46
                                 ADAPTEC, INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

financial ratios among other restrictive covenants. The Company was in
compliance with all such covenants as of March 31, 1999.

     In May 1998, the Company assumed a $6.8 million unsecured revolving line of
credit, of which $4.7 million was outstanding, in conjunction with the purchase
of Ridge Technologies, Inc. ("Ridge") (Note 8). In August 1998, the Company paid
in full and terminated this line of credit.

     The Company had available an unsecured $17.0 million revolving line of
credit that was to expire on December 31, 1998. No borrowings were outstanding
under this line of credit as of and since March 31, 1998. In June 1998, the
Company terminated this line of credit.

NOTE 5. LONG-TERM DEBT

     In February 1997, the Company issued $230.0 million of 4 3/4% Convertible
Subordinated Notes due on February 1, 2004. The Company received net proceeds of
$223.9 million. The notes provide for semi-annual interest payments each
February 1 and August 1, commencing on August 1, 1997. The holders of the notes
are entitled to convert the notes into common stock at a conversion price of
$51.66 per share through February 1, 2004. The notes are redeemable, in whole or
in part, at the option of the Company, at any time on or after February 3, 2000
at declining premiums to par. Debt issuance costs are being amortized ratably
over the term of the notes.

     In June 1992, the Company entered into a $17.0 million term loan agreement
bearing interest at 7.65%, with principal and interest payable in quarterly
installments of $850,000. In the first quarter of fiscal 1999, the Company paid
the remaining outstanding principal and interest due on the loan.

NOTE 6. TAIWAN SEMICONDUCTOR MANUFACTURING AGREEMENTS

     In each of fiscal years 1996 through 1998, the Company entered into
agreements with TSMC, including Option I, Option II and Option III Agreements,
which provide the Company with guaranteed capacity for wafer fabrication in
exchange for advance payments by the Company. The Company records the
prepayments as either prepaid expenses or other assets based upon the amount
expected to be utilized in the next 12 months. As wafers are received from TSMC,
the prepaid expenses balance is reclassified to inventory. The Company utilized
$18.2 million and $9.8 million of the prepayments in fiscal 1999 and 1998,
respectively, which were capitalized into inventory. The advance payments
expected to be realized in the next 12 months of $8.4 million are classified in
prepaid expenses and the remaining advance payments or $21.1 million are
classified in other assets and are expected to be realized by the Company during
the term of the agreements through December 31, 2002.

     In fiscal 1998, the Company entered into the Option III TSMC Agreement,
which provided the Company with increased wafer fabrication capacity in return
for advance payments totaling $35.3 million. The Company signed a non-interest
bearing promissory note for the $35.3 million, which was due in two equal
installments of approximately $17.6 million and $17.7 million. The first
installment was paid in January 1998. In January 1999, the Company and TSMC
mutually agreed to terminate the Option III Agreement and the remaining unpaid
balance on the related promissory note. Further, TSMC agreed to refund the
Company the $17.6 million previously paid, in four equal quarterly installments.
The Company reversed the $35.3 million of payments classified in other assets as
well as the $17.6 million of long-term debt and recorded a $17.7 million
receivable due from TSMC, which is classified in prepaid expenses. At no time
did the Company determine that the prepaid balance was impaired.

     Additionally, in fiscal 1999, the Company and TSMC amended the Option I and
Option II Agreements to extend the term of the agreements by two years through
December 31, 2002, and TSMC agreed to refund the Company $5.4 million of
advanced payments, payable in four equal quarterly installments. This amount due
from TSMC was also reclassified from other assets to prepaid expenses.

                                      F-10
<PAGE>   47
                                 ADAPTEC, INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

     There can be no assurance that the Company will be able to satisfy its
future wafer needs from current or alternative manufacturing sources. This could
result in possible loss of sales or reduced margins.

NOTE 7. STATEMENTS OF OPERATIONS

     Restructuring and other charges include:

<TABLE>
<CAPTION>
                                                               1999      1998     1997
                                                              -------   ------   ------
                                                                   (IN THOUSANDS)
<S>                                                           <C>       <C>      <C>
Acquisition related charges (Note 8)........................  $21,463   $   --   $1,705
Restructuring charges (Note 10).............................   39,931       --       --
Asset impairments and other charges (Note 11)...............    7,394    6,715       --
                                                              -------   ------   ------
          Total.............................................  $68,788   $6,715   $1,705
                                                              =======   ======   ======
</TABLE>

NOTE 8. BUSINESS COMBINATIONS AND RELATED PARTY TRANSACTIONS

     Fiscal 1999: In April 1998, the Company purchased ASIC technologies from
ADI for $34.4 million in cash. The ASIC technologies purchased from ADI were
incorporated into the mainstream removable PTS business line. Grant Saviers,
former Chairman and CEO of the Company is a director of ADI. Additionally, in
May 1998, the Company acquired Ridge, a development stage company, for 1.2
million shares of the Company's common stock valued at $21.2 million and assumed
stock options valued at $13.1 million. The Company incurred $1.2 million in
professional fees, including finance, accounting, legal and appraisal fees,
related to the acquisitions, which were capitalized as part of the purchase
price of the transactions.

     Fiscal 1998: In both June and September 1997, the Company invested an
aggregate $5.0 million in Series A Preferred Stock, representing a 19.9%
interest in Ridge. In conjunction with this investment, Grant Saviers, former
Chairman and CEO of the Company, became a director of Ridge. In December 1997,
the Company wrote-down its minority investment by $3.5 million to $1.5 million
based on an identified impairment (Note 11). In February 1998, the Company
guaranteed a $6.8 million line of credit on behalf of Ridge in exchange for a
warrant to purchase up to 200,000 shares of Ridge common stock. During fiscal
1998, the Company incurred $0.9 million in research and development expenditures
related to consulting services provided by Ridge.

     Fiscal 1997: During fiscal 1997, the Company acquired complementary
businesses and technologies consisting of Western Digital's Connectivity
Solutions Group ("WD"), CD-R software technology from Corel, Inc. ("Corel"),
Data Kinesis, Inc. ("DKI"), Sigmax Technology, Inc. ("Sigmax"), Toast CD-R
technology ("Toast"), and certain assets from Skipstone, Inc. ("Skipstone") for
an aggregate amount of approximately $109.0 million in cash and $15.3 million in
stock options exchanged. These companies were in the business of designing and
developing silicon solutions for the Small Computer System Interface ("SCSI")
disk drive market, CD Creator for the CD-R software market, software for
improving system performance in file management and RAID (Redundant Array of
Independent Disks) applications, CD-ROM controllers for ATAPI CD-ROM drivers
and, CD-R technology for Macintosh platforms.

     The Company accounted for these acquisitions using the purchase method of
accounting, and excluding the aggregate write-off of acquired in-process
technology from these acquisitions for fiscal 1999 and 1997, the aggregate
impact of the acquisitions was not material to the Company's consolidated
statements of operations from the acquisition date.

     The allocation of the Company's aggregate purchase price to the tangible
and identifiable intangible assets acquired and liabilities assumed is
summarized below. The allocations were based on independent appraisals and
estimates of fair values. The allocation for the ASIC technologies purchased
from ADI in fiscal

                                      F-11
<PAGE>   48
                                 ADAPTEC, INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

1999 has been restated to conform with the Securities and Exchange Commission
("SEC") staff's current views regarding valuation methodologies (Note 9).

<TABLE>
<CAPTION>
                                                               1999       1997
                                                              -------   --------
                                                                (IN THOUSANDS)
<S>                                                           <C>       <C>
Net tangible assets (liabilities)...........................  $(2,752)  $ 10,979
  In-process technology.....................................   45,482     90,457
  Goodwill and other intangible assets:
     Goodwill...............................................   25,078     22,855
     Covenant not to compete................................    2,200         --
     Acquired employees.....................................    1,375         --
                                                              -------   --------
                                                               28,653     22,855
                                                              -------   --------
  Net assets acquired.......................................  $71,383   $124,291
                                                              =======   ========
</TABLE>

     In fiscal 1999, the tangible liabilities assumed exceeded the tangible
assets acquired, which was comprised primarily of a line of credit (Note 4),
accounts payable and fixed assets. In fiscal 1997, the tangible assets acquired
were primarily comprised of inventory and equipment. Acquired in-process
technology was written-off in the period in which the acquisitions were
completed. The goodwill and other intangible assets associated with Ridge and
the ASIC technologies purchased from ADI were written-off and relieved in August
1998 and January 1999 as a result of divesting the storage subsystems business
and the sale of the mainstream removable PTS business line, respectively (Notes
10 and 13). The goodwill associated with WD was relieved in November 1998 in
conjunction with the sale of the high-end PTS business line (Note 13). The
goodwill associated with Sigmax and Skipstone was deemed impaired and
written-off in fiscal 1998 (Note 11). The goodwill associated with DKI and Toast
is being amortized over a benefit period of three years and will be fully
amortized during fiscal 2000

     In fiscal 1998, the Company entered into an agreement to purchase all of
the outstanding stock of Symbios, Inc., a wholly-owned subsidiary of Hyundai
Electronics America ("HEA"). In fiscal 1999, the Company and HEA mutually agreed
to terminate the agreement. The Company paid a $7.0 million termination fee and
approximately $6.7 million in nonconsummation fees to HEA. Additionally, the
Company incurred approximately $7.8 million in other acquisition-related
charges, including legal, consulting and other costs. The Company expensed the
entire $21.5 million in fees associated with this terminated acquisition in
"Restructuring and other charges" in the Consolidated Statements of Operations
in the first quarter of fiscal 1999 (Note 7).

     During fiscal 1998, the Company purchased $1.0 million in preferred stock,
and entered into a development and license agreement with a venture-stage
company whose founder and CEO, Larry Boucher, is also a founder, former interim
CEO, and Chairman of the Board of Directors of the Company. During fiscal 1999,
the Company and the venture-stage company agreed to terminate the development
and license agreement. Two other directors of the Company are also directors of
the venture-stage company.

     In fiscal 1997, the Company completed its acquisition of Cogent Data
Technologies, Inc. ("Cogent"). The Company acquired all of the outstanding
capital stock of Cogent in exchange for 2.6 million shares of its common stock.
Additionally, the Company incurred $1.7 million in professional fees related to
this acquisition, which have been included in "Restructuring and other charges"
in the Consolidated Statements of Operations in the periods the costs were
incurred (Note 7). The Company has recorded this acquisition using the
pooling-of-interests method of accounting. Cogent's historical operations, net
assets, and cash flows were not material to the Company's consolidated financial
statements and, therefore, have not been reflected in the Company's consolidated
financial results prior to the acquisition. Beginning at the date of
acquisition, the book value of the acquired assets and assumed liabilities as
well as the results of Cogent's operations and cash flows, all of which are not
material to the Company, have been combined with those of the Company.

                                      F-12
<PAGE>   49
                                 ADAPTEC, INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

NOTE 9. ACQUIRED IN-PROCESS TECHNOLOGY AND RELATED INTANGIBLES

     During fiscal 1999 and 1997, the Company purchased complementary businesses
recorded under the purchase method of accounting, resulting in an aggregate
write-off of acquired in-process technology of $45.5 million and $90.5 million,
respectively.

     In the first quarter of fiscal 1999, the Company purchased Ridge and
acquired ASIC technologies from ADI, which resulted in a first quarter write-off
of acquired in-process technology charge of $26.4 million and $39.4 million,
respectively. The unamortized goodwill associated with Ridge was written-off in
the second quarter of fiscal 1999, in connection with the Company's
restructuring activities and decision to exit the storage subsystems business.
The write-off was included in "Restructuring and other charges" in the
Consolidated Statements of Operations. The Company reduced its estimate of the
amount allocated to acquired in-process technology from the purchase of ASIC
technologies from ADI by $20.3 million from $26.4 million previously reported in
the first quarter of fiscal 1999 to $6.1 million. Amortization of intangibles
increased approximately $1.7 million in each of the first three quarters of
fiscal 1999 from $7.5 million to $12.6 million for the year ended March 31,
1999. In the fourth quarter of fiscal 1999, the Company relieved the unamortized
goodwill associated with ASIC technologies purchased from ADI in connection with
the sale of the Company's mainstream removable PTS business line. The Company
reduced the gain originally reported in the Company's Form 8-K dated January 15,
1999 by $14.0 million from $45.5 million previously reported to $31.5 million
for the fourth quarter and year ended March 31, 1999. Basic and diluted net
income (loss) per share for the four quarters of fiscal 1999 were impacted by
the restatement as follows:

<TABLE>
<CAPTION>
                                                               PRIOR TO     SUBSEQUENT TO
                        FISCAL 1999                           RESTATEMENT    RESTATEMENT
                        -----------                           -----------   -------------
<S>                                                           <C>           <C>
First quarter:
  Basic.....................................................    $(0.68)        $(0.51)
  Diluted...................................................    $(0.68)        $(0.51)
Second quarter:
  Basic.....................................................    $(0.22)        $(0.23)
  Diluted...................................................    $(0.22)        $(0.23)
Third quarter:
  Basic.....................................................    $ 0.25         $ 0.23
  Diluted...................................................    $ 0.24         $ 0.23
Fourth quarter:
  Basic.....................................................    $ 0.58         $ 0.43
  Diluted...................................................    $ 0.55         $ 0.41
</TABLE>

     There was no impact on fiscal 1999 year-to-date basic or diluted net loss
per share. Additionally, there will be no impact on future results of operations
as the goodwill associated with ASIC technologies purchased from ADI was
relieved in the fourth quarter of fiscal 1999.

     The Company allocated amounts to acquired in-process technology in the
first quarter of fiscal 1999 in a manner consistent with widely recognized
appraisal practices at the date of the acquisition of ASIC technologies from
ADI. Subsequent to the acquisition, the SEC staff expressed views that took
issue with certain appraisal practices generally employed in determining the
fair value of the acquired in-process technology that was the basis for the
Company's measurement of the acquired in-process technology charge. The charge
of $26.4 million associated with ASIC technologies purchased from ADI, as first
reported, was based upon assumptions and appraisal methodologies the SEC has
since announced it does not consider appropriate.

     As a result of computing the acquired in-process technology using the SEC
preferred methodology, the Company decided to revise the amount originally
allocated to acquired in-process technology relating to the

                                      F-13
<PAGE>   50
                                 ADAPTEC, INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

acquisition of ASIC technologies from ADI. The Company has revised its results
of operations for fiscal 1999 and will amend its Reports on Form 10-Q for the
first three quarters of fiscal 1999 previously filed with the SEC.

     The $6.1 million allocation of the purchase price to acquired in-process
technology from ASIC technologies purchased from ADI was determined by
identifying research projects, including read channel and preamplifier ASIC
technologies, in areas for which technological feasibility had not been
established and no alternative future uses existed. The value was determined by
estimating the expected cash flows from the projects once commercially viable,
discounting the net cash flows back to their present value and the applying a
percentage of completion to the calculated value as defined below.

     Net cash flows. The net cash flows from the identified projects were based
on estimates of revenues, cost of sales, research and development costs,
selling, general and administrative costs, royalty costs and income taxes from
those projects. These estimates were based on the assumptions mentioned below.
The research and development costs included in the model reflected costs to
complete development of technologies acquired and sustain projects, but excluded
costs to bring acquired in-process projects to technological feasibility.

     The estimated revenues were based on management projections of the acquired
in-process projects for read channel and preamplifier ASIC products and the
business projections were compared and found to be in line with industry
analysts' forecasts of growth in substantially all of the relevant markets.
Estimated total revenues from the majority of the acquired in-process technology
product areas were expected to peak in fiscal 2001 and decline from 2002 into
2003 as other new products were expected to become available. These projections
were based on estimates of market size and growth, expected trends in
technology, and the nature and expected timing of new product introductions by
the Company and its competitors.

     Projected gross margins were based on management's estimates and were in
line with the Company's business which acquired ASIC technologies from ADI. The
estimated selling, general and administrative costs were in line with comparable
company averages within the industry at approximately 14% of revenues. Research
and development costs was consistent with ADI's historical cost structure.

     Discount rate. Discounting the net cash flows back to their present value
was based on cost of capital for start up companies and well managed venture
capital funds which typically have similar risks and returns on investments. The
cost of capital used in discounting the net cash flows from acquired in-process
technology was 25%, as reported by Bradley A. Fowler in the Business Valuation
Review of March 19, 1996. Higher required rates of return, which would
correspond to higher risk, may have been somewhat mitigated by the Company's
expertise in the disk drive market.

     Percentage of completion. The percentage of completion for the projects was
determined using costs incurred by ADI prior to the acquisitions to date
compared to the remaining research and development to be completed to bring the
projects to technological feasibility. The Company estimates, as of the
acquisition date, the projects in aggregate were approximately 71% complete and
the aggregate costs to complete are $11.0 million ($8.0 million in fiscal 1999
and $3.0 million in fiscal 2000). Substantially all of the acquired in-process
technology projects were expected to be completed and generating revenues within
two years following the acquisition date.

     The Company and its advisors believe that the restated acquired in-process
technology charge relating to ASIC technologies purchased from ADI of $6.1
million is valued consistently with the SEC staff's current views regarding
valuation methodologies. There can be no assurances, however, that the SEC staff
will not

                                      F-14
<PAGE>   51
                                 ADAPTEC, INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

take issue with any assumptions used in the Company's valuation model and
require the Company to further revise the amount allocated to acquired
in-process technology.

     In fiscal 1997, the Company acquired complementary businesses and
technologies consisting of WD, Corel, DKI, Sigmax, Toast and Skipstone for an
aggregate purchase price of $124.3 million, resulting in a write-off of acquired
in-process technology charge of $90.5 million. Unamortized goodwill associated
with WD was relieved in fiscal 1999 in connection with the sale of the high-end
PTS business line to TI, for which no gain was derived. Goodwill associated with
Corel was minimal and expensed in fiscal 1997. Unamortized goodwill associated
with Sigmax and Skipstone was deemed impaired and written-off in fiscal 1998 and
the write-off is included in "Restructuring and other charges" in the
Consolidated Statements of Operations (Note 11). The acquired in-process
technology associated with DKI was completed subsequent to the acquisition and
is now incorporated in the Company's products which began shipping in fiscal
1999. The acquired in-process technology associated with Toast related to
further developments of the already existing Toast product. Such developments
were later incorporated into the Company's products. Goodwill associated with
DKI and Toast will be fully amortized during fiscal 2000.

NOTE 10. RESTRUCTURING CHARGES

     During fiscal 1999, the Company recorded $39.9 million in restructuring
charges, including $21.6 million of severance and benefits ($3.9 million in
non-cash stock-based compensation charges -- Note 15), $13.5 million of asset
write-offs, and $4.8 million in other charges.

     In the first quarter of fiscal 1999, in connection with management's plan
to reduce costs and improve operating efficiencies, the Company recorded a
restructuring charge of $8.8 million. The restructuring charge was comprised
primarily of severance and benefits related to the involuntary termination of
approximately 550 employees, of which approximately 36% were based in the U.S.
and the remainder were based in Singapore.

     In the second quarter of fiscal 1999, the Company recorded a restructuring
charge of $24.5 million, net of an adjustment to the restructuring charge taken
in the first quarter of fiscal 1999 of $1.4 million. This charge was a direct
result of management's decision to refocus the business and divest certain
unprofitable business activities including storage subsystems (primarily those
business activities purchased in connection with the Ridge transaction -- Note
8), fibre channel, external storage, satellite networking and high-end
peripheral technology solutions. The Company continues to hold a minority
interest in the fibre channel, external storage and satellite networking
technologies through investments in Jaycor Networks, Inc. ("JNI"), Chaparral
Technologies, Inc. ("Chaparral") and BroadLogic Inc. ("BroadLogic"),
respectively (Note 13). The second quarter restructuring charge was comprised
primarily of severance and benefits related to the involuntary termination of
approximately 300 U.S. employees and the write-off of property and equipment,
inventory, and other assets including goodwill associated with the storage
subsystems business. The adjustments to the prior quarter provision reflect
changes to the estimated costs of anticipated expenses as actual costs were
settled.

     In the fourth quarter of fiscal 1999, the Company recorded a restructuring
charge of $6.6 million, net of an adjustment to the restructuring charges taken
in the first and second quarters of fiscal 1999 of $1.2 million. This charge
resulted from a reduction in the infrastructure that supported businesses
divested during fiscal 1999 (Note 13). The restructuring charge was comprised
primarily of severance and benefits related to the involuntary termination of
approximately 125 employees, of which most were based in the U.S., and the
write-off of property and equipment. The adjustment to the prior quarter
provisions was primarily a result of favorable negotiations with vendors
surrounding contractual obligations.

                                      F-15
<PAGE>   52
                                 ADAPTEC, INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

     The following table sets forth an analysis of the components of the
restructuring charges recorded in fiscal 1999:

RESTRUCTURING CHARGES

<TABLE>
<CAPTION>
                                                     SEVERANCE
                                                        AND         ASSET        OTHER
                  QUARTERS ENDED                     BENEFITS     WRITE-OFFS    CHARGES     TOTAL
                  --------------                     ---------    ----------    -------    -------
                                                                    (IN THOUSANDS)
<S>                                                  <C>          <C>           <C>        <C>
MARCH 31, 1999
Severance and benefits.............................   $5,982       $    --      $    --    $ 5,982
Property and equipment write-offs..................       --         1,245           --      1,245
Accrued lease costs................................       --            --          190        190
Other charges......................................       --            --          354        354
Adjustment to prior quarters' provisions...........      534          (459)      (1,245)    (1,170)
                                                      ------       -------      -------    -------
Total March 31, 1999...............................   $6,516       $   786      $  (701)   $ 6,601
                                                      ======       =======      =======    =======
SEPTEMBER 30, 1998
Severance and benefits.............................   $9,231       $    --      $    --    $ 9,231
Inventory write-offs...............................       --           984           --        984
Property and equipment write-offs..................       --         8,484           --      8,484
Contractual obligations............................       --            --        3,742      3,742
Accrued lease costs................................       --            --          927        927
Goodwill and other assets write-offs...............       --         2,005           --      2,005
Other charges......................................       --            --          605        605
Adjustment to prior quarter provision..............     (934)          280         (794)    (1,448)
                                                      ------       -------      -------    -------
Total September 30, 1998...........................   $8,297       $11,753      $ 4,480    $24,530
                                                      ======       =======      =======    =======
JUNE 30, 1998
Severance and benefits.............................   $6,800       $    --      $    --    $ 6,800
Property and equipment write-offs..................       --           950           --        950
Other charges......................................       --            --        1,050      1,050
                                                      ------       -------      -------    -------
Total June 30, 1998................................   $6,800       $   950      $ 1,050    $ 8,800
                                                      ======       =======      =======    =======
</TABLE>

                                      F-16
<PAGE>   53
                                 ADAPTEC, INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

     The following table sets forth the Company's restructuring reserves:

<TABLE>
<CAPTION>
                                                    SEVERANCE
                                                       AND         ASSET        OTHER
              RESTRUCTURING RESERVES                BENEFITS     WRITE-OFFS    CHARGES     TOTAL
              ----------------------                ---------    ----------    -------    --------
                                                                    (IN THOUSANDS)
<S>                                                 <C>          <C>           <C>        <C>
Restructuring charges.............................   $ 6,800      $    950     $ 1,050    $  8,800
Cash paid.........................................    (3,244)           --          --      (3,244)
Non-cash charges..................................      (296)         (950)         --      (1,246)
                                                     -------      --------     -------    --------
Balance at June 30, 1998..........................     3,260            --       1,050       4,310
                                                     =======      ========     =======    ========
Restructuring charges.............................     8,297        11,753       4,480      24,530
Cash paid.........................................    (6,718)           --        (272)     (6,990)
Non-cash charges..................................      (338)      (11,753)         --     (12,091)
                                                     -------      --------     -------    --------
Balance at September 30, 1998.....................     4,501            --       5,258       9,759
                                                     =======      ========     =======    ========
Cash paid.........................................    (3,742)           --      (1,794)     (5,536)
                                                     -------      --------     -------    --------
Balance at December 31, 1998......................       759            --       3,464       4,223
                                                     =======      ========     =======    ========
Restructuring charges.............................     6,516           786        (701)      6,601
Cash paid.........................................    (2,550)           --      (1,737)     (4,287)
Non-cash charges..................................    (3,258)         (786)         --      (4,044)
                                                     -------      --------     -------    --------
Balance at March 31, 1999.........................   $ 1,467      $     --     $ 1,026    $  2,493
                                                     =======      ========     =======    ========
</TABLE>

     The Company expects the fiscal 1999 restructuring activities will result in
an annual savings in the range of $80 - $90 million. These savings may be
potentially offset by incremental costs associated with anticipated business
growth. The Company anticipates that the remaining reserve balance at March 31,
1999 of $2.5 million will be substantially paid out in the first half of fiscal
2000.

NOTE 11. ASSET IMPAIRMENTS AND OTHER CHARGES

     The Company regularly evaluates the recoverability of long-lived assets by
measuring the carrying amount of the assets against the estimated undiscounted
future cash flows associated with them. At the time such evaluations indicate
that the future undiscounted cash flows are not sufficient to recover the
carrying value of such assets, the assets are adjusted to their fair values.
Based on these evaluations, the Company recorded non-cash impairment charges of
$4.0 million and $6.7 in fiscal 1999 and 1998, respectively. The fiscal 1999
impairment charges related to $1.4 million in manufacturing equipment deemed
unnecessary due to non-temporary declines in production volume and the write-off
of approximately $2.6 million of non-trade related receivables classified in
other current assets.

     The fiscal 1998 impairment consisted of impairments of the remaining
balances of goodwill for the acquisitions of Sigmax and Skipstone of $1.5
million and $1.7 million, respectively and the write-down of the Company's
minority investment in Ridge of $3.5 million. The remaining goodwill for Sigmax
was written-off when the Company decided to abandon this business after the R&D
project fell behind and the critical market window was missed, the engineers
acquired in the purchase had left the Company, and the intellectual property was
deemed to have no alternative use. The remaining goodwill from the acquisition
of Skipstone was written-off when the Company decided to abandon this business
as the market for this technology was not developing at the rate required to
earn a reasonable return on its investment, most of the engineers acquired in
the purchase had left the Company, and the intellectual property had no
alternative use. The impairment and write-down of the Ridge minority investment
was a result of delays in the Ridge product. Ridge was not able to bring the
Ridge product under development to market in a timely manner, which management
believed resulted in permanent impairment of the value of the Company's
underlying investment in Ridge.

                                      F-17
<PAGE>   54
                                 ADAPTEC, INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

     Additionally, the Company recorded executive termination costs of $3.4
million in fiscal 1999, relating to three executives. The costs consisted of
$1.9 million in severance and benefit payments and $1.5 million in non-cash
stock compensation charges resulting from amended option agreements (Note 15).

     The asset impairment and other charges above are included in "Restructuring
and other charges" in the Consolidated Statements of Operations in the period
incurred.

NOTE 12. ASSETS HELD FOR SALE

     In connection with the Company's restructuring activities and evaluation of
long-lived assets, the Company is actively pursuing the sale of certain assets.
In the fourth quarter of fiscal 1999, the Company recorded a gain on the sale of
land in California of $1.6 million and included the gain in interest and other
income for the year ended March 31, 1999. Cash proceeds from the sale were
received in April 1999. As of March 31, 1999, the Company had approximately
$41.1 million in prepaid expenses as assets held for sale representing land and
buildings in California and Colorado. These assets, valued at cost which
approximates net realizable value, are expected to be sold within the next 12
months and are included in current assets as of March 31, 1999.

     In April 1999, the Company sold some of the land held for sale in
California, which resulted in a gain of $3.5 million to be recorded in the first
quarter of fiscal 2000.

NOTE 13. BUSINESS DIVESTITURES

     In November 1998, the Company entered into a definitive agreement with
Texas Instruments, Inc. ("TI") under which certain assets of the Company's
high-end PTS business line were sold to TI for approximately $8.5 million in
cash. The Company received cash proceeds of $4.5 million upon consummation of
the asset purchase agreement. The outstanding balance of $4.0 million was paid
in two equal installments in February and May of 1999. Additionally, the Company
agreed to license certain technologies to TI for $3.7 million. The license
payments are due and payable in varying amounts during the second quarter
through the fourth quarter of the Company's fiscal 2000. In addition, TI agreed
to pay royalties ranging from 2 - 5% on certain products for up to five years.

     In November 1998, the Company entered into a definitive agreement with JNI
whereby the Company agreed to contribute certain tangible and intangible assets
related to the fibre channel product line in exchange for ownership interest in
JNI. The Company's ownership percentage is 6.7% with warrants to purchase
additional shares upon successful completion of various milestones by JNI. The
aggregate price of the warrants is nominal and would represent an additional
11.7% ownership by the Company upon exercise. In addition, the Company has
agreed to provide JNI with certain other manufacturing services and lease space
to JNI in one of the Company's facilities for a transitionary period of time.
The Company and JNI also entered into a cross-license agreement whereby JNI will
pay royalties on certain products and the Company will license certain
technologies from JNI royalty-free.

     In November 1998, the Company entered into a definitive agreement with
Chaparral whereby the Company agreed to contribute certain tangible and
intangible assets related to the external storage product line for 19.9% of the
outstanding stock of Chaparral. In addition, the Company has agreed to provide
certain other manufacturing services for a transitionary period of time and
lease space in one of the Company's facilities. The Company and Chaparral also
entered into a cross-license agreement whereby Chaparral will pay royalties on
certain products. The Company will license certain technologies from Chaparral
royalty-free in order to manufacture product for Chaparral.

     In December 1998, the Company entered into a definitive agreement with
BroadLogic whereby the Company agreed to contribute certain tangible and
intangible assets related to the satellite networking product line in exchange
for 19.9% of the outstanding stock of BroadLogic and warrants to purchase common
stock. In

                                      F-18
<PAGE>   55
                                 ADAPTEC, INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

addition, the Company has agreed to provide certain other manufacturing services
for a transitionary period of time and lease space to BroadLogic in one of the
Company's facilities. The Company and BroadLogic also entered into a
royalty-free cross-license agreement.

     In January 1999, the Company consummated an agreement with
STMicroelectronics, Inc. ("ST") under which ST acquired certain assets and
obtained certain intellectual property rights of the Company's mainstream
removable PTS business line for an aggregate purchase price of $72.1 million in
cash and $3.3 million in cost reimbursements. The Company received all of the
cash proceeds in January 1999 and recorded a gain of $10.0 million (net of taxes
of $21.5 million) in the fourth quarter of fiscal 1999. The gain on the sale of
the business line has been restated to reflect the change in goodwill associated
with the purchase of ASIC technologies from ADI (Note 9). In addition, the
Company has agreed to provide certain other manufacturing services and lease
space to ST in one of the Company's facilities for a transitionary period of
time. The Company and ST also entered into a royalty-free cross-license
agreement.

     The Company's unaudited pro forma net revenues (excluding PTS and in
thousands) were $601,639, $757,507 and $688,488 in fiscal 1999, 1998 and 1997,
respectively. The Company's unaudited pro forma net income was $479, $134,412
and $99,972 in fiscal 1999, 1998 and 1997, respectively.

     The Company's investments in JNI, Chaparral and BroadLogic approximate fair
value and are accounted for under the cost method. The combined investments are
valued at approximately $1.0 million. Additionally, billings for products and
services provided were less than $2.0 million in fiscal 1999 and are not
anticipated to be material going forward.

NOTE 14. NET INCOME (LOSS) PER SHARE

     Net income (loss) per share is presented in accordance with Statement of
Financial Accounting Standards No. 128 ("SFAS 128") for all periods presented.

     Basic net income (loss) per share is computed by dividing net income (loss)
available to common stockholders (numerator) by the weighted average number of
common shares outstanding (denominator) during the period. Diluted net income
(loss) per share gives effect to all dilutive potential common shares
outstanding during a period. In computing diluted net income (loss) per share,
the average stock price for the period is used in determining the number of
shares to be purchased from exercise of stock options under the treasury stock
method.

     Following is a reconciliation of the numerators and denominators of the
basic and diluted net income (loss) per share computations for the years ended
March 31:
<TABLE>
<CAPTION>
                                          1999                                1998
                         ---------------------------------------   ---------------------------
                           INCOME         SHARES       PER SHARE     INCOME         SHARES
                         (NUMERATOR)   (DENOMINATOR)    AMOUNT     (NUMERATOR)   (DENOMINATOR)
                         -----------   -------------   ---------   -----------   -------------
                                       (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
<S>                      <C>           <C>             <C>         <C>           <C>
BASIC
Net income (loss)
 available to common
 stockholders..........   $(13,293)       110,127       $(0.12)     $172,877        113,172
                                                        ======
Effect of Dilutive
 Securities Common
 stock equivalents.....         --             --                         --          5,260
4 3/4% Convertible
 Subordinated Notes....         --             --                         --             --
                          --------        -------                   --------        -------
DILUTED
Net income (loss)
 available to common
 stockholders and
 assumed conversions...   $(13,293)       110,127       $(0.12)     $172,877        118,432
                          ========        =======       ======      ========        =======

<CAPTION>
                           1998                       1997
                         ---------   ---------------------------------------
                         PER SHARE     INCOME         SHARES       PER SHARE
                          AMOUNT     (NUMERATOR)   (DENOMINATOR)    AMOUNT
                         ---------   -----------   -------------   ---------
                              (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
<S>                      <C>         <C>           <C>             <C>
BASIC
Net income (loss)
 available to common
 stockholders..........    $1.53      $107,561        108,456        $0.99
                           =====                                     =====
Effect of Dilutive
 Securities Common
 stock equivalents.....                     --          6,447
4 3/4% Convertible
 Subordinated Notes....                    441            693
                                      --------        -------
DILUTED
Net income (loss)
 available to common
 stockholders and
 assumed conversions...    $1.46      $108,002        115,596        $0.93
                           =====      ========        =======        =====
</TABLE>

                                      F-19
<PAGE>   56
                                 ADAPTEC, INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

     Options to purchase 18,384,000 shares of common stock were outstanding at
March 31, 1999, however, the stock options and conversion of 4,452,000 shares of
common stock related to the 4 3/4% Convertible Subordinated Notes were not
included in the computation of diluted net loss per share for the year ended
March 31, 1999, because they were anti-dilutive.

     Additional options to purchase 2,369,000 shares of common stock were
outstanding at March 31, 1998, but were not included in the computation of
diluted weighted average shares outstanding because the options' exercise price
was greater than the average market price of the common shares during the year
ended March 31, 1998. The conversion of 4,452,000 shares of common stock related
to the 4 3/4% Convertible Subordinated Notes are also not included in the
computation of diluted net income per share for the year ended March 31, 1998,
as the impact was anti-dilutive.

     Additional options to purchase 203,000 shares of common stock were
outstanding at March 31, 1997, but were not included in the computation of
diluted weighted average shares outstanding because the options' exercise price
was greater than the average market price of the common shares during the year
ended March 31, 1997.

NOTE 15. STOCKHOLDERS' EQUITY

1986 EMPLOYEE STOCK PURCHASE PLAN

     The Company has authorized 10,600,000 shares of common stock for issuance
under the 1986 Employee Stock Purchase Plan (1986 Plan). Qualified employees may
elect to have a certain percentage (not to exceed 10%) of their salary withheld
pursuant to the 1986 Plan. The salary withheld is then used to purchase shares
of the Company's common stock at a price equal to 85% of the market value of the
stock at the beginning or ending of the offering period, whichever is lower.
Prior to March 31, 1998, the offering period was three months. During fiscal
1999, the Company amended the 1986 Plan to extend the offering period to six
months. Under this Plan, 770,006, 359,849 and 285,336 shares were issued during
fiscal 1999, 1998 and 1997, representing approximately $6.6 million, $9.4
million and $5.9 million in employee contributions, respectively.

1990 STOCK PLAN

     The Company's 1990 Stock Plan allows the Board of Directors to grant to
employees, officers, and consultants options to purchase common stock or other
stock rights at exercise prices not less than 50% of the fair market value of
the underlying common stock on the date of grant. The expiration of options or
other stock rights is not to exceed ten years after the date of grant. To date,
the Company has issued all incentive and non-statutory stock options under this
Plan at exercise prices of at least 100% of fair market value of the underlying
common stock on the respective dates of grant. Generally, options vest and
become exercisable over a four year period. In March 1999, the Company amended
the 1990 Stock Plan to permit non-employee directors of the Company to
participate in the plan. The annual grant to the Board of Directors was made on
March 31, 1999, under this plan.

                                      F-20
<PAGE>   57
                                 ADAPTEC, INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

     Option activity under the 1990 Stock Plan is as follows:

<TABLE>
<CAPTION>
                                                                         OPTIONS OUTSTANDING
                                                                    ------------------------------
                                                       OPTIONS                    WEIGHTED AVERAGE
                                                      AVAILABLE       SHARES       EXERCISE PRICE
                                                     -----------    -----------   ----------------
<S>                                                  <C>            <C>           <C>
BALANCE, MARCH 31, 1996............................    8,196,630     11,639,662        $13.32
  Authorized.......................................    9,833,906             --            --
  Granted..........................................   (7,296,738)     7,296,738        $24.69
  Exercised........................................           --     (2,414,728)       $ 8.58
  Cancelled........................................    1,555,300     (1,555,300)       $19.33
                                                     -----------    -----------        ------
BALANCE, MARCH 31, 1997............................   12,289,098     14,966,372        $19.05
  Authorized.......................................    4,846,065             --            --
  Granted..........................................  (15,509,116)    15,509,116        $28.81
  Exercised........................................           --     (2,393,758)       $12.05
  Cancelled........................................   10,990,488    (10,990,488)       $33.30
                                                     -----------    -----------        ------
BALANCE, MARCH 31, 1998............................   12,616,535     17,091,242        $19.69
  Authorized.......................................    4,490,166             --            --
  Granted..........................................  (22,837,135)    22,837,135        $13.38
  Exercised........................................           --     (2,412,849)       $10.66
  Cancelled........................................   19,731,659    (19,731,659)       $18.88
                                                     -----------    -----------        ------
BALANCE, MARCH 31, 1999............................   14,001,225     17,783,869        $13.71
                                                     ===========    ===========        ======
Options exercisable at:
  March 31, 1997................................................      5,397,068        $12.97
  March 31, 1998................................................      6,861,531        $16.41
  March 31, 1999................................................      6,995,660*       $13.49
</TABLE>

- ---------------
* Amount includes certain vested options repriced in the third quarter of fiscal
  1999 but not exercisable until April 1999. See "Repricing of Stock Options"
  below.

     The following table summarizes information about the 1990 Stock Plan at
March 31, 1999:

<TABLE>
<CAPTION>
     OPTIONS OUTSTANDING               OPTIONS EXERCISABLE
- -----------------------------   ---------------------------------
                    NUMBER      WEIGHTED AVERAGE      WEIGHTED        NUMBER         WEIGHTED
   RANGE OF       OUTSTANDING      REMAINING          AVERAGE       EXERCISABLE      AVERAGE
EXERCISE PRICES   AT 3/31/99    CONTRACTUAL LIFE   EXERCISE PRICE   AT 3/31/99    EXERCISE PRICE
- ---------------   -----------   ----------------   --------------   -----------   --------------
<S>               <C>           <C>                <C>              <C>           <C>
$ 0.37 - $10.00    1,802,552          5.4              $ 6.79        1,529,203        $ 6.84
$10.01 - $20.00   13,333,397          8.2              $12.72        4,071,507        $12.38
$20.01 - $30.00    2,647,920          7.0              $23.43        1,394,950        $23.97
                  ----------                                         ---------
                  17,783,869          7.8              $13.71        6,995,660        $13.49
                  ==========                                         =========
</TABLE>

1990 DIRECTORS' OPTION PLAN

     The 1990 Directors' Option Plan provides for the automatic grant to
non-employee directors of non-statutory stock options to purchase common stock
at the fair market value of the underlying common stock on the date of grant,
which is generally the last day of each fiscal year except for the first grant
to any newly elected director. Upon joining the board, each new non-employee
director receives an option for 40,000 shares which vests over four years and,
prior to March 31, 1997, expired five years after the date of grant. Originally
and prior to March 31, 1997, each director received an option at the end of each
fiscal year for 10,000 shares, which vested quarterly and over a four year
period and expired five years after the date of grant. During fiscal 1997, the
Company amended the Directors' Option Plan such that all newly issued shares
expire ten years

                                      F-21
<PAGE>   58
                                 ADAPTEC, INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

after the date of grant and all newly issued annual shares vest over a one year
period. During fiscal 1999, the Company amended the Director's Option Plan to
increase the annual grant to 15,000 shares for the fiscal year ended March 31,
1999, however, in March 1999, the Company suspended the annual stock option
grants to directors under this plan. Instead, the fiscal 1999 grant to directors
was made under the newly amended 1990 Stock Plan.

     Option activity under the 1990 Directors' Option Plan is as follows:

<TABLE>
<CAPTION>
                                                                         OPTIONS OUTSTANDING
                                                                     ----------------------------
                                                       OPTIONS                   WEIGHTED AVERAGE
                                                      AVAILABLE       SHARES      EXERCISE PRICE
                                                      ---------      --------    ----------------
<S>                                                   <C>            <C>         <C>
BALANCE, MARCH 31, 1996.............................    580,000       652,500         $15.80
  Authorized........................................    800,000            --             --
  Granted...........................................    (70,000)       70,000         $37.25
  Exercised.........................................         --      (113,750)        $ 6.73
                                                      ---------      --------         ------
BALANCE, MARCH 31, 1997.............................  1,310,000       608,750         $19.96
  Granted...........................................   (120,000)      120,000         $29.83
  Exercised.........................................         --      (101,250)        $ 9.32
                                                      ---------      --------         ------
BALANCE, MARCH 31, 1998.............................  1,190,000       627,500         $23.56
  Granted...........................................    (40,000)       40,000         $11.00
  Exercised.........................................         --       (67,500)        $ 9.19
                                                      ---------      --------         ------
BALANCE, MARCH 31, 1999.............................  1,150,000       600,000         $24.34
                                                      =========      ========         ======
Options exercisable at:
  March 31, 1997...............................................       248,750         $14.10
  March 31, 1998...............................................       342,500         $22.03
  March 31, 1999...............................................       467,500         $24.16
</TABLE>

     The following table summarizes information about the 1990 Directors' Option
Plan at March 31, 1999:

<TABLE>
<CAPTION>
     OPTIONS OUTSTANDING               OPTIONS EXERCISABLE
- -----------------------------   ---------------------------------
                    NUMBER      WEIGHTED AVERAGE      WEIGHTED        NUMBER         WEIGHTED
   RANGE OF       OUTSTANDING      REMAINING          AVERAGE       EXERCISABLE      AVERAGE
EXERCISE PRICES   AT 3/31/99    CONTRACTUAL LIFE   EXERCISE PRICE   AT 3/31/99    EXERCISE PRICE
- ---------------   -----------   ----------------   --------------   -----------   --------------
<S>               <C>           <C>                <C>              <C>           <C>
$10.01 - $20.00..   127,500           3.6              $14.77          87,500         $16.50
$20.01 - $30.00..   362,500           3.3              $22.45         297,500         $22.28
$30.01 - $40.00..    70,000           8.0              $37.25          70,000         $37.25
$40.01 - $50.00..    40,000           8.5              $49.38          12,500         $49.38
                    -------                                           -------
                    600,000           4.3              $24.34         467,500         $24.16
                    =======                                           =======
</TABLE>

PRO FORMA INFORMATION

     Pro forma information regarding net income (loss) and net income (loss) per
share is required to be determined as if the Company had accounted for the
options granted pursuant to its 1986 Employee Stock Purchase Plan, 1990 Stock
Plan, and 1990 Directors' Option Plan, collectively called "options", under the
fair value method SFAS 123. The fair value of options granted in fiscal 1999,
1998 and 1997 reported below have

                                      F-22
<PAGE>   59
                                 ADAPTEC, INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

been estimated at the date of grant using a Black-Scholes option pricing model
with the following weighted average assumptions:

<TABLE>
<CAPTION>
                                      1986 EMPLOYEE STOCK                               1990 DIRECTORS'
                                         PURCHASE PLAN          1990 STOCK PLAN           OPTION PLAN
                                      --------------------    --------------------    --------------------
                                      1999    1998    1997    1999    1998    1997    1999    1998    1997
                                      ----    ----    ----    ----    ----    ----    ----    ----    ----
<S>                                   <C>     <C>     <C>     <C>     <C>     <C>     <C>     <C>     <C>
Expected life (in years)..........    0.34    0.25    0.25      4       4       4       4       4        4
Risk-free interest rate...........    5.2%    5.4%    5.2%    5.2%    5.4%    6.0%    5.2%    5.4%     6.0%
Volatility........................     62%     52%     44%     62%     52%     44%     62%     52%      44%
Dividend yield....................     --      --      --      --      --      --      --      --       --
</TABLE>

     The Black-Scholes option valuation model was developed for use in
estimating the fair value of traded options that 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 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 the opinion
of management, the existing models do not necessarily provide a reliable single
measure of fair value of its options. The weighted average estimated fair value
of the 1986 Employee Stock Purchase Plan grants during 1999, 1998 and 1997 was
$3.44, $6.84 and $6.65 per share, respectively. The weighted average estimated
fair value of shares granted under the 1990 Stock Plan during 1999, 1998 and
1997 was $6.95, $18.44 and $12.24, respectively. The weighted average estimated
fair value of shares granted under the 1990 Directors' Plan during 1999, 1998
and 1997 was $5.43, $13.56 and $14.80, respectively.

     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 follows (in thousands except per share amounts):

<TABLE>
<CAPTION>
                                                        1999        1998       1997
                                                      --------    --------    -------
<S>                                                   <C>         <C>         <C>
Pro forma net income (loss).........................  $(75,981)   $127,351    $83,305
Pro forma basic net income (loss) per share.........  $  (0.69)   $   1.13    $  0.77
Pro forma diluted net income (loss) per share.......  $  (0.69)   $   1.08    $  0.72
</TABLE>

     The effects on pro forma disclosures of applying SFAS 123 are not likely to
be representative of the effects on pro forma disclosures of future years, since
it is applicable only to options granted subsequent to March 31, 1995.
Therefore, the pro forma effect of SFAS 123 is not fully reflected in fiscal
1998 and 1997.

REPRICING OF STOCK OPTIONS

     On October 21, 1998, the Company approved the cancellation and reissuance
of outstanding stock options under the Company's stock option plans. Under this
program, all current active employees, except for executive officers, with
outstanding stock options with an exercise price in excess of $12.50 per share
could exchange their stock options for new non-qualified stock options with an
exercise price of $12.50 per share, the fair market value of the common stock on
the exchange date. The new options maintain the vesting schedule established by
the canceled stock options, however, the exercisability of the exchanged options
was suspended until April 1999. During fiscal 1999, 11,111,933 stock options
were repriced to $12.50. The weighted average exercise price of the stock
options prior to repricing was $19.53.

     On January 30, 1998, the Company approved the cancellation and reissuance
of outstanding options under the Company's stock option plans. Under the
program, holders of outstanding options with exercise prices in excess of $22.31
per share were given the choice of retaining these options or of obtaining in
substitution new options for the same number of shares. The new options were
exercisable at a price of $22.31 per share, the fair market value of the common
stock on the reissue date. The new options maintained the vesting schedule
established by the canceled option, except that vesting is suspended for six
months, while

                                      F-23
<PAGE>   60
                                 ADAPTEC, INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

vesting for officers of the Company participating in the stock repricing is
suspended for twelve months. During fiscal 1998, 9,536,254 stock options were
repriced to $22.31. The weighted average exercise price of the stock options
prior to repricing was $37.50.

STOCK-BASED COMPENSATION CHARGES

     During fiscal 1999, the Company recorded non-cash stock-based compensation
charges of $3.4 million related to restructuring activities (Note 10), $1.5
million in connection with the termination of executives (Note 11), and $9.0
million in connection with the sale of the high-end PTS business line to ST
(Note 13). The stock-based compensation charges were recorded pursuant to
modifications made to the option holder's original option agreements. The
charges were accounted for using either the intrinsic value method or the fair
value method, based on the nature of the modification and the subsequent
relationship with the option holder. The charges were recorded as an increase to
additional paid-in-capital in the period the modification occurred.

RIGHTS PLAN

     The Company has reserved 250,000 shares of Series A Preferred Stock for
issuance under the 1996 Rights Agreement which was amended and restated as of
December 5, 1996. Under this plan, stockholders have received one Preferred
Stock Purchase Right ("Right") for each outstanding share of the Company's
common stock. Each Right will entitle stockholders to buy one one-thousandth of
a share of Series A Preferred Stock at an exercise price of $180.00 per right.
The Rights trade automatically with shares of the Company's common stock. The
Rights are not exercisable until ten days after a person or group announces
acquisition of 20% or more of the Company's outstanding common stock or the
commencement of a tender offer which would result in ownership by a person or
group of 20% or more of the then outstanding common stock.

     The Company is entitled to redeem the Rights at $0.01 per Right anytime on
or before the tenth day following such an acquisition or tender offer. This
redemption period may be extended by the Company in some cases. If, prior to
such redemption, the Company is acquired in a merger or other business
combination, a party acquires 20% or more of the Company's common stock, a 20%
stockholder engages in certain self-dealing transactions, or the Company sells
50% or more of its assets, each right will entitle the holder to purchase from
the surviving corporation, for $180.00 per share, common stock having a then
current market value of $360.00 per share.

     The Series A Preferred Stock purchasable upon exercise of the Rights will
not be redeemable. Each share of Series A Preferred Stock will be entitled to an
aggregate dividend of 1,000 times the dividend declared per common stock. In the
event of liquidation, the holders of the Series A Preferred Stock will be
entitled to a preferential liquidation payment equal to 1,000 times the per
share amount to be distributed to the holders of the common stock. Each share of
Series A Preferred Stock will have 1,000 votes, voting together with the common
stock. In the event of any merger, consolidation or other transaction in which
the common stock are changed or exchanged, each share of Series A Preferred
Stock will be entitled to receive 1,000 times the amount received per common
stock. These rights are protected by customary anti-dilution provisions.

                                      F-24
<PAGE>   61
                                 ADAPTEC, INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

SHARES RESERVED FOR FUTURE ISSUANCE

     At March 31, 1999, the Company has reserved the following shares of
authorized but unissued common stock:

<TABLE>
<S>                                                           <C>
1986 Employee Stock Purchase Plan...........................   5,323,183
1990 Stock Plan.............................................  31,785,094
1990 Directors' Option Plan.................................   1,750,000
Conversion of 4 3/4% Convertible Subordinated Notes.........   4,452,187
                                                              ----------
                                                              43,310,464
                                                              ==========
</TABLE>

STOCK REPURCHASES

     In January 1998, the Company's Board of Directors authorized the purchase
of up to 10 million shares of the Company's common stock in the open market.
During the fourth quarter of fiscal 1998, the Company repurchased and retired
approximately 350,000 shares of its common stock from the open market for
approximately $7.8 million. During the second quarter of fiscal 1999, the
Company repurchased and retired 8,261,000 shares of its common stock for
approximately $97.2 million. The transactions were recorded as reductions to
common stock and additional paid-in capital.

     In October 1998, the Company's Board of Directors authorized an additional
repurchase of up to $200.0 million of the Company's common stock in the open
market. The Company repurchased an additional 485,000 and 4,185,000 shares of
its common stock for approximately $9.3 million and $93.7 million in the third
and fourth quarters of fiscal 1999, respectively. The transactions were recorded
as reductions to common stock and additional paid-in capital.

     In May 1999, the Company's Board of Directors approved a third repurchase
program of up to $200.0 million of the Company's common stock in the open
market.

NOTE 16. INCOME TAXES

     The components of income before income taxes for the years ended March 31
are as follows:

<TABLE>
<CAPTION>
                                                       1999        1998        1997
                                                     --------    --------    --------
                                                              (IN THOUSANDS)
<S>                                                  <C>         <C>         <C>
Domestic...........................................  $(46,500)   $ 95,400    $ 74,866
Foreign............................................    67,442     149,929      96,915
                                                     --------    --------    --------
Income before income taxes.........................  $ 20,942    $245,329    $171,781
                                                     --------    --------    --------
</TABLE>

     The split of domestic and foreign income was impacted by the acquisition
related write-offs of acquired in-process technology, restructuring and other
charges, and the gain on the sale of PTS which reduced domestic income by $136
million for 1999 and $92 million for 1997.

                                      F-25
<PAGE>   62
                                 ADAPTEC, INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

     The components of the provision for income taxes for the years ended March
31 are as follows:

<TABLE>
<CAPTION>
                                                               1999       1998       1997
                                                              -------    -------    -------
                                                                     (IN THOUSANDS)
<S>                                                           <C>        <C>        <C>
Federal
  Current...................................................  $35,542    $46,362    $45,363
  Deferred..................................................  (14,077)   (11,552)   (10,025)
                                                              -------    -------    -------
                                                               21,465     34,810     35,338
                                                              -------    -------    -------
Foreign
  Current...................................................   12,111     21,520     21,418
  Deferred..................................................     (738)      (319)    (1,961)
                                                              -------    -------    -------
                                                               11,373     21,201     19,457
                                                              -------    -------    -------
State
  Current...................................................    1,448     10,067     11,335
  Deferred..................................................      (51)    (2,626)    (1,910)
                                                              -------    -------    -------
                                                                1,397      7,441      9,425
                                                              -------    -------    -------
  Provision for income taxes................................  $34,235    $63,452    $64,220
</TABLE>

     The reduction in provision for income taxes for fiscal 1999 reflects the
large decrease in income before taxes. This reduction, however, was offset in
part by acquisition and restructuring related costs for which no tax benefit
will be derived. The tax benefit associated with dispositions from employee
stock plans reduces taxes currently payable for 1999 by $18.2 million ($12.4
million and $22.1 million for 1998 and 1997, respectively). These benefits were
recorded directly to stockholders' equity.

Significant components of the Company's deferred tax assets as of March 31 are
as follows:

<TABLE>
<CAPTION>
                                                               1999       1998
                                                              -------    -------
                                                                (IN THOUSANDS)
<S>                                                           <C>        <C>
Not currently deductible reserves...........................  $23,854    $16,024
State taxes.................................................      546      2,054
Compensatory accruals.......................................    7,190      9,320
Various expense accruals....................................   11,928     11,299
Capitalized technology......................................   11,278      7,156
Foreign tax credits.........................................   12,660         --
Fixed assets................................................   (5,061)      (304)
Other.......................................................   (1,050)       930
                                                              -------    -------
Net deferred tax assets.....................................  $61,345    $46,479
                                                              =======    =======
</TABLE>

                                      F-26
<PAGE>   63
                                 ADAPTEC, INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

     The provision for income taxes differs from the amount computed by applying
the federal statutory tax rate to income before taxes for the years ended March
31 as follows:

<TABLE>
<CAPTION>
                                                              1999     1998     1997
                                                              -----    -----    -----
<S>                                                           <C>      <C>      <C>
Federal statutory rate......................................   35.0%    35.0%    35.0%
State taxes, net of federal benefit.........................    1.4      2.3      2.7
Foreign subsidiary income at other than the U.S. tax rate...   (9.6)   (10.9)   (11.9)
Tax-exempt interest income..................................  (15.9)    (1.7)    (1.2)
Acquisition write-offs......................................  100.2       --     12.4
Gain associated with sale of PTS segment....................   50.1       --       --
Other.......................................................    2.3      1.2      0.4
                                                              -----    -----    -----
Effective income tax rate...................................  163.5%    25.9%    37.4%
</TABLE>

     The Company's effective tax rate for fiscal 1999 was 164% compared to 26%
and 37% for fiscal 1998 and 1997. The increase in effective tax rate was
primarily due to the write off of acquired in-process technology and goodwill,
which are not deductible for tax purposes, and the gain associated with the sale
of the PTS segment. In the third quarter of fiscal 1999, the Company's
normalized effective tax rate changed (exclusive of write-off's of acquired
in-process technology and goodwill and the gain associated with the sale of the
PTS segment) from 25% to 28% due to a geographic shift of earnings resulting
from restructuring and business divestitures. For fiscal 1998 and 1997, the
Company's normalized effective tax rate was 25% (exclusive of write-offs of
acquired in-process technology and goodwill).

     The Company's subsidiary in Singapore is currently operating under a tax
holiday. If certain conditions are met, the tax holiday provides that profits
derived from certain products will be exempt from Singapore tax through fiscal
2006. In addition, profits derived from the Company's remaining products will be
taxed at a lower rate than the Singapore statutory rate of 26%, through fiscal
1999. As of March 31, 1999, the Company had not accrued income taxes on $394
million of accumulated undistributed earnings of its Singapore subsidiary, as
these earnings will be reinvested indefinitely.

NOTE 17. COMMITMENTS AND CONTINGENCIES

     The Company leases certain office facilities, vehicles, and certain
equipment under operating lease agreements that expire at various dates through
fiscal 2007. As of March 31, 1999, future minimum lease payment under
non-cancelable operating leases totaled $14.5 million and are due and payable as
follows (in thousands):

<TABLE>
<S>                                                          <C>
FISCAL YEAR
2000.......................................................  $ 4,808
2001.......................................................    4,257
2002.......................................................    2,742
2003.......................................................    1,169
2004.......................................................      441
2005 and thereafter........................................    1,130
                                                             -------
                                                             $14,547
                                                             =======
</TABLE>

     Rent expense was approximately $3.7 million, $6.6 million and $5.7 million
during fiscal 1999, 1998 and 1997, respectively.

     During fiscal 1996, the Company entered into an agreement with Lucent
Technologies, Inc. ("Lucent") to procure up to $25.0 million of fabrication
equipment for the Lucent facility in Spain. In exchange, the Company would be
ensured availability of certain levels of wafer capacity from Lucent. During
1997, the

                                      F-27
<PAGE>   64
                                 ADAPTEC, INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

Company purchased $21.0 million of equipment in connection with the Lucent
agreement. Subsequently, in the fourth quarter of fiscal 1997, the Company
determined that it would not require the additional wafer capacity and entered
into a separate agreement to sell the fabrication equipment to Lucent at a price
equal to the Company's carrying value and to terminate the wafer capacity
agreement. Accordingly, there was no impairment identified or recorded. There
were also no termination fees associated with the subsequent agreement. Lucent
paid the Company in two installments, both of which were received in fiscal
1998.

     A class action lawsuit is pending in the United States District Court for
the Northern District of California against the Company and certain of its
officers and directors. The action alleges that the Company made false and
misleading statements at various times during the period between April 1997 and
January 1998 in violation of the federal securities laws. The complaint does not
set forth purported damages. In addition, a derivative action is pending in the
Superior Court of the State of California against the Company and certain of its
officers and directors alleging that the individual defendants improperly
profited from transactions in the Company's stock during the same time period
referenced by the class action lawsuit. The Company believes the lawsuit and
derivative action are without merit and intends to defend itself vigorously.

     The IRS is currently auditing the Company's income tax returns for fiscal
1994 to 1996. No proposed adjustments have been received for these years. The
Company believes sufficient taxes have been provided and that the ultimate
outcome of the IRS audits will not have a material adverse impact on the
Company's financial position or results of operations.

     From time to time, the Company is subject to certain litigation, claims and
assessments in the normal course of business. The Company believes that any
liability with respect to such routine litigation, individually or in the
aggregate, is not likely to be material to the Company's financial position or
results of operations.

NOTE 18. SEGMENT REPORTING AND FOREIGN OPERATIONS

     In fiscal 1999, the Company adopted Statement of Financial Accounting
Standards No. 131 ("SFAS 131"), "Disclosures about Segments of an Enterprise and
Related Information." The Company evaluated its product segments in accordance
with SFAS 131 and concluded that its reportable segments are Host I/O, RAID
(Redundant Array of Independent Disks), Software and PTS.

     The Host I/O segment designs, develops, manufactures and markets host bus
adapter ("HBA") boards and chips that allow computers to transfer information to
and from peripherals, such as hard disk drives, scanners, CD-ROMs, CD-Rs,
CD-RWs, DVD-ROMs, and Zip and Jaz drives among many other devices. The Company's
HBAs are based on Small Computer System Interface ("SCSI") technology and are
utilized in servers, high-end workstations and desktops where high performance
I/O is a vital component of overall system performance.

     The RAID segment designs, develops, manufactures and markets bus-based and
microprocessor-based RAID solutions. These products are utilized from entry
level workstations to enterprise-class servers. The Company's RAID adapters
provide performance and functionality, incorporate the latest technical
innovations, and offer superior software functionality to make RAID fast, simple
and reliable.

     The Software segment designs, develops and markets optical media software
for CD-R and CD-RW. This segment includes video editing products and software
utility products that simplify connecting a SCSI host adapter and peripherals to
a microcomputer system. The Company's CD-R and CD-RW products are used for data
storage to optical media, including audio, video and still photos, and provide
users storage alternatives to traditional disk and removable media options.
Additionally, CD-RW allows users to transfer downloaded music from the internet
to CDs for private use. The Company's CD-R software offerings are available as
standalone products, and also ship built-in or "bundled" with most CD-R drives
in the desktop market.

                                      F-28
<PAGE>   65
                                 ADAPTEC, INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

     The business lines that comprised the PTS segment were sold in November
1998 and January 1999 to TI and ST, respectively. This segment designed,
developed, manufactured and marketed proprietary integrated circuits ("ICs") for
use in mass storage devices and other peripherals.

     Summarized financial information concerning the Company's reportable
segments is shown in the following table. The Company does not identify or
allocate assets or depreciation by operating segments nor are the segments
evaluated under these criteria. The "Other" column includes corporate related
items and, as it relates to segment profit (loss), income and expenses not
allocated to reportable segments, primarily related unusual transactions and to
businesses divested in fiscal 1999 (Note 13).

<TABLE>
<CAPTION>
                                     HOST
                                     I/O        RAID     SOFTWARE     PTS        OTHER       TOTAL
                                   --------   --------   --------   --------   ---------   ----------
                                                             (IN THOUSANDS)
<S>                                <C>        <C>        <C>        <C>        <C>         <C>
Fiscal 1999
  Revenues.......................  $520,148   $ 32,166   $47,110    $ 90,803   $   2,214   $  692,441
  Segment profit (loss)..........   162,882    (18,650)    7,219     (30,628)    (99,881)      20,942
Fiscal 1998
  Revenues.......................   701,114     14,494    38,186     249,786       3,713    1,007,293
  Segment profit (loss)..........   261,582    (28,483)    8,249      32,189     (28,208)     245,329
Fiscal 1997
  Revenues.......................   667,722      3,290    17,425     245,380          51      933,868
  Segment profit (loss)..........   259,941    (23,430)   (1,471)     53,484    (116,743)     171,781
</TABLE>

     The following table presents the details of "Other" segment profit (loss):

<TABLE>
<CAPTION>
                                                             (IN THOUSANDS)
                                                    ---------------------------------
                                                      1999        1998        1997
                                                    --------    --------    ---------
<S>                                                 <C>         <C>         <C>
Losses from divested businesses...................  $(31,679)   $(34,378)   $ (20,583)
Unallocated corporate expenses, net...............    (8,364)     (7,612)     (14,551)
Interest and other income.........................    35,059      32,899       13,297
Interest expense..................................   (12,103)    (12,402)      (2,744)
Write-off of acquired in-process technology.......   (45,482)         --      (90,457)
Restructuring and other charges...................   (68,788)     (6,715)      (1,705)
Gain on sale of PTS...............................    31,476          --           --
                                                    --------    --------    ---------
Total.............................................  $(99,881)   $(28,208)   $(116,743)
                                                    ========    ========    =========
</TABLE>

     The following table presents revenues by country and is attributed to
countries based on location of the selling entity:

<TABLE>
<CAPTION>
                                                      1999         1998         1997
                                                    --------    ----------    --------
                                                              (IN THOUSANDS)
<S>                                                 <C>         <C>           <C>
United States.....................................  $295,736    $  704,334    $782,622
Singapore.........................................   388,676       294,217     147,367
Other countries...................................     8,029         8,742       3,879
                                                    --------    ----------    --------
Total.............................................  $692,441    $1,007,293    $933,868
                                                    ========    ==========    ========
</TABLE>

                                      F-29
<PAGE>   66
                                 ADAPTEC, INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

     The following table presents long-lived assets by country based on the
location of the asset and includes all non-current assets except non-current
financial instruments and deferred tax assets:

<TABLE>
<CAPTION>
                                                                1999        1998
                                                              --------    --------
                                                                 (IN THOUSANDS)
<S>                                                           <C>         <C>
United States...............................................  $ 94,085    $167,644
Singapore...................................................    31,030      25,051
Other countries.............................................     1,619       2,103
                                                              --------    --------
Total.......................................................  $126,734    $194,798
                                                              ========    ========
</TABLE>

     The Company had no significant customers which accounted for more than 10%
of net revenues or gross receivables in fiscal 1999, 1998 and 1997.

NOTE 19. COMPARATIVE QUARTERLY FINANCIAL DATA (UNAUDITED)

     Summarized quarterly financial data is presented below. Note that certain
items previously reported in specific financial statement captions have been
reclassified to conform with current presentation. Additionally, the following
information has been adjusted to reflect the restatement of the purchase price
allocation of ASIC technologies from ADI (Note 7). The Company will amend its
Reports on Form 10-Q for the first three quarters of fiscal 1999 previously
filed with the SEC.

<TABLE>
<CAPTION>
                                                                    QUARTERS
                                             ------------------------------------------------------
                                              FIRST      SECOND     THIRD      FOURTH       YEAR
                                             --------   --------   --------   --------   ----------
                                                    (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
<S>                                          <C>        <C>        <C>        <C>        <C>
FISCAL 1999
Net revenues...............................  $180,630   $143,922   $183,872   $184,017   $  692,441
Gross profit...............................  $100,892   $ 80,835   $109,153   $117,058   $  407,938
Write-off of acquired in-process
  technology...............................  $ 45,482   $     --   $     --   $     --   $   45,482
Restructuring and other charges............  $ 30,263   $ 31,924   $     --   $  6,601   $   68,788
Gain on sale of the PTS segment............  $     --   $     --   $     --   $ 31,476   $   31,476
Net income (loss)..........................  $(58,749)  $(25,924)  $ 25,012   $ 46,368   $  (13,293)
Net income (loss) per share:
  Basic....................................  $  (0.51)  $  (0.23)  $   0.23   $   0.43   $    (0.12)
  Diluted..................................  $  (0.51)  $  (0.23)  $   0.23   $   0.41   $    (0.12)
Weighted average shares outstanding:
  Basic....................................   114,200    111,583    108,040    106,687      110,127
  Diluted..................................   114,200    111,583    110,881    111,881      110,127

FISCAL 1998
Net revenues...............................  $271,442   $278,088   $254,163   $203,600   $1,007,293
Gross profit...............................  $163,948   $173,558   $158,859   $119,828   $  616,193
Restructuring and other charges............  $     --   $  1,528   $  5,187   $     --   $    6,715
Net income.................................  $ 59,689   $ 62,719   $ 27,075   $ 23,394   $  172,877
Net income per share:
  Basic....................................  $   0.53   $   0.56   $   0.24   $   0.21   $     1.53
  Diluted..................................  $   0.51   $   0.52   $   0.23   $   0.20   $     1.46
Weighted average shares outstanding:
  Basic....................................   112,008    112,931    113,666    114,083      113,172
  Diluted..................................   122,181    123,902    124,444    116,558      118,432
</TABLE>

                                      F-30
<PAGE>   67

                              REPORT OF MANAGEMENT

     Management is responsible for the preparation and integrity of the
consolidated financial statements and other financial information presented in
the annual report. The accompanying financial statements were prepared in
conformity with generally accepted accounting principles and as such include
some amounts based on management's best judgments and estimates. Financial
information in the annual report is consistent with that in the financial
statements.

     Management is responsible for maintaining a system of internal business
controls and procedures to provide reasonable assurance that assets are
safeguarded and that transactions are authorized, recorded, and reported
properly. The internal control system is continuously monitored by management
review, written policies and guidelines, and careful selection and training of
qualified personnel who are provided with and expected to adhere to the
Company's standards of business conduct. Management believes the Company's
internal controls provide reasonable assurance that assets are safeguarded
against material loss from unauthorized use or disposition and the financial
records are reliable for preparing financial statements and other data and
maintaining accountability for assets.

     The Audit Committee of the Board of Directors meets periodically with the
independent accountants and management to discuss internal business controls,
auditing, and financial reporting matters. The Committee also reviews with the
independent accountants the scope and results of the audit effort.

     The independent accountants, PricewaterhouseCoopers LLP, are engaged to
audit the consolidated financial statements of the Company and conduct such
tests and related procedures, as they deem necessary in accordance with
generally accepted auditing standards. The opinion of the independent
accountants, based upon their audit of the consolidated financial statements, is
contained in this annual report.

<TABLE>
<S>                                                <C>
/s/ ROBERT N. STEPHENS                             /s/ ANDREW J. BROWN
- --------------------------------------------       --------------------------------------------
Robert N. Stephens                                 Andrew J. Brown
President and Chief Executive Officer              Vice President, Finance and
                                                   Chief Financial Officer

/s/ KENNETH B. AROLA                               /s/ J. PETER CAMPAGNA
- --------------------------------------------       --------------------------------------------
Kenneth B. Arola                                   J. Peter Campagna
Vice President, Corporate Controller, and          Vice President and Treasurer
Principal Accounting Officer
</TABLE>

                                      F-31
<PAGE>   68

                       REPORT OF INDEPENDENT ACCOUNTANTS

To the Board of Directors and Stockholders of Adaptec, Inc.

     In our opinion, the consolidated financial statements listed in the index
appearing under Item 14(a)(1) on page   , present fairly, in all material
respects, the financial position of Adaptec, Inc. and its subsidiaries at March
31, 1999 and 1998, and the results of their operations and their cash flows for
each of the three years in the period ended March 31, 1999, in conformity with
generally accepted accounting principles. 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 of these statements in accordance with generally accepted auditing
standards, which 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, assessing the
accounting principles used and significant estimates made by management, and
evaluating the overall financial statement presentation. We believe our audits
provide a reasonable basis for the opinion expressed above.

     As discussed in Note 1 to the consolidated financial statements, the
Company changed its method of accounting for business process reengineering
costs in 1998.

/s/ PRICEWATERHOUSECOOPERS LLP
- ---------------------------------------------------------

PricewaterhouseCoopers LLP

San Jose, California
April 28, 1999

                                      F-32
<PAGE>   69

                               INDEX TO EXHIBITS

<TABLE>
<CAPTION>
EXHIBIT
NUMBER                             DESCRIPTION                           NOTES
- -------                            -----------                           -----
<S>        <C>                                                           <C>
 2.1       Agreement for Purchase and Sale of Stock by and among           (3)
           Western Digital Corporation, Western Digital CSG
           Corporation, and Adaptec, Inc. dated April 9, 1996.
 2.2       Agreement and Plan of Reorganization by and among Adaptec,      (4)
           Inc., Adaptec Acquisition Corporation, and Data Kinesis,
           Inc. dated August 6, 1996.
 2.3       Asset Acquisition Agreement by and among Adaptec, Inc. and     (16)
           Analog Devices, Inc. dated March 24, 1998
 2.4       Agreement and Plan of Reorganization by and among Adaptec,     (16)
           Inc., Ridge Technologies and RDS Acquisition (as of May 21,
           1998).
 2.5       Agreement and Plan of Merger dated February 23, 1998 between   (16)
           Registrant and Adaptec, Inc., a California corporation.
 2.6       Asset Purchase Agreement between Texas Instruments,            (14)
           Incorporated and Adaptec, Inc. dated November 6, 1998.
 2.7       Asset Acquisition Agreement among Adaptec, Inc., Adaptec       (14)
           Mfg.(s) Pte. Ltd. And STMicroelectronics, Inc. dated January
           15, 1999.
 2.8       Amendment No. 1 to Asset Acquisition Agreement among           (14)
           Adaptec, Inc., Adaptec
           Mfg. (s) Pte. Ltd. and STMicroelectronics, Inc. dated
           January 15, 1999.
 3.1       Certificate of Incorporation of Registrant filed with          (16)
           Delaware Secretary of State on November 19, 1997.
 3.2       Bylaws of Registrant, as amended on June 29, 1999.
 4.1       Second Amended and Restated Rights Agreement dated December     (8)
           5, 1996 between Registrant and Chase Mellon Shareholder
           Services, Inc. as Rights Agents.
 4.2       First Amendment dated March 12, 1998 to Second Amended and     (16)
           Restated Rights Agreement.
 4.3       Indenture dated as of February 3, 1997 between Registrant       (1)
           and State Street Bank and Trust Company.
 4.4       First Supplemental indenture dated as of March 12, 1998        (16)
           between Registrant and State Street Bank and Trust Company.
10.1+      Registrant's 1986 Employee Stock Purchase Plan.                 (6)
10.2       Technology License Agreement dated January 1, 1985 between     (10)
           the Registrant and International Business Machines
           Corporation.
10.3+      Registrant's Savings and Retirement Plan.                       (9)
10.4+      1990 Stock Plan, as amended.                                   (12)
10.5+      Forms of Stock Option Agreement, Tandem Stock Option/SAR        (7)
           Agreement, Restricted Stock Purchase Agreement, Stock
           Appreciation Rights Agreement, and Incentive Stock Rights
           Agreement for use in connection with the 1990 Stock Plan, as
           amended.
10.6+      1990 Directors' Option Plan and forms of Stock Option
           Agreement, as amended.
10.7       Option Agreement I Between Adaptec Manufacturing (S) Pte.       (2)
           Ltd. and Taiwan Semiconductor Manufacturing Co., Ltd. dated
           October 23, 1995.
10.8*      Option Agreement II Between Adaptec Manufacturing (S) Pte.      (2)
           Ltd. and Taiwan Semiconductor Manufacturing Co., Ltd. dated
           October 23, 1995.
10.9       Consignment Agreement between Adaptec, Inc. and AT&T Corp.      (2)
           dated January 10, 1996.
</TABLE>
<PAGE>   70

<TABLE>
<CAPTION>
EXHIBIT
NUMBER                             DESCRIPTION                           NOTES
- -------                            -----------                           -----
<S>        <C>                                                           <C>
10.10      Form of Indemnification Agreement entered into with            (11)
           directors and officers of Adaptec, Inc., a California
           corporation, prior to Registrant's reincorporation into
           Delaware.
10.11      Form of Indemnification Agreement entered into between         (16)
           Registrant and its officers and directors.
10.12      Deposit and Supply Agreement between Taiwan Semiconductor       (6)
           Manufacturing Co., Ltd. and Adaptec Manufacturing Pte. Ltd.
10.13      Industrial Lease Agreement between the Registrant, as           (5)
           Lessee, and Jurong Town Corporation, as Lessor.
10.14      Amendment No. 1 to Option Agreement III between Adaptec        (13)
           Manufacturing (s) Pte. Ltd. And Taiwan Semiconductor
           Manufacturing Co. Ltd.
10.15      Termination of Option III agreement between Adaptec            (15)
           Manufacturing (s) Pte. Ltd. And Taiwan Semiconductor
           Manufacturing Co. Ltd.
10.16**    Amendment to Option Agreements I & II between Taiwan
           Semiconductor Manufacturing Co., Ltd. and Adaptec
           Manufacturing (s) Pte. Ltd.
10.17      Modification to Amendment to Option Agreements I & II
           between Taiwan Semiconductor Manufacturing Co., Ltd. and
           Adaptec Manufacturing (s) Pte. Ltd.
21.1       Subsidiaries of Registrant.
23.1       Consent of Independent Accountants, PricewaterhouseCoopers
           LLP. (See Page 34)
24.1       Power of Attorney. (See Page 36)
27.1       Financial Data Schedule for the year ended March 31, 1999.
27.2       Financial Data Schedule for the year ended March 31, 1998.
27.3       Financial Data Schedule for the year ended March 31, 1997.
</TABLE>

- ---------------
 (1) Incorporated by reference to exhibits filed with Registrant's Registration
     Statement Number 333-24557 on Form S-1 on April 4, 1997.

 (2) Incorporated by reference to exhibits filed with Registrant's Annual Report
     on Form 10-K for the year ended March 31, 1996.

 (3) Incorporated by reference to exhibits filed with Registrant's Quarterly
     Report on Form 10-Q for the quarter ended June 28, 1996.

 (4) Incorporated by reference to exhibits filed with Registrant's Quarterly
     Report on Form 10-Q for the quarter ended September 27, 1996.

 (5) Incorporated by reference to exhibits filed with Registrant's Annual Report
     on Form 10-K for the year ended March 31, 1995.

 (6) Incorporated by reference to exhibits filed with Registrant's Annual Report
     on Form 10-K for the year ended March 31, 1994.

 (7) Incorporated by reference to exhibits filed with Registrant's Annual Report
     on Form 10-K for the year ended March 31, 1993.

 (8) Incorporated by reference to Exhibit 1 filed with Amendment No. 4 to
     Registrant's Registration Statement Number 0-15071 on Form 8-A as filed on
     January 4, 1997.

 (9) Incorporated by reference to exhibits filed with Registrant's Annual Report
     on Form 10-K for the fiscal year ended March 31, 1987.

(10) Incorporated by reference to Exhibit 10.15 filed in response to Item 16(a)
     "Exhibits," of Registrant's Registration Statement on Form S-1 and
     Amendment No. 1 and Amendment No. 2 thereto
     (file No. 33-5519), which became effective on June 11, 1986.
<PAGE>   71

(11) Incorporated by reference to exhibits filed with Registrant's Annual Report
     on Form 10-K for the fiscal year ended March 31, 1992.

(12) Incorporated by reference to Exhibit 4.2 to Form 10-Q as filed February 7,
     1996.

(13) Incorporated by reference to Exhibit 10.1 to Form 10-Q as filed August 7,
     1998.

(14) Incorporated by reference to Exhibits 2.1, 2.2, 2.3, respectively, to Form
     8-K as filed January 29, 1999.

(15) Incorporated by reference to Exhibit 10.1 to Form 10-Q as filed February
     12, 1999.

(16) Incorporated by reference to exhibits filed with the Registrant's Annual
     Report on Form 10-K for the year ended March 31, 1998.

  +  Management contract or compensatory plan or arrangement required to be
     filed as an exhibit to this Form 10-K pursuant to Item 14(c) of said form.

  *  Confidential treatment has been granted for portions of this agreement.

  ** Confidential treatment has been requested for portions of this agreement.

<PAGE>   1
                                                                     EXHIBIT 3.2


                                     BYLAWS

                                       OF

                                  ADAPTEC, INC.

                             a Delaware Corporation




- ------------------
Amended as of June 29, 1999



                                      -i-

<PAGE>   2
                               TABLE OF CONTENTS
                                  (CONTINUED)


<TABLE>
<CAPTION>
                                                                                  PAGE
                                                                                  ----
<S>                                                                               <C>
ARTICLE I CORPORATE OFFICES........................................................1

           1.1       REGISTERED OFFICE.............................................1
           1.2       OTHER OFFICES.................................................1

ARTICLE II MEETINGS OF STOCKHOLDERS................................................1

           2.1       PLACE OF MEETINGS.............................................1
           2.2       ANNUAL MEETING................................................1
           2.3       SPECIAL MEETING...............................................2
           2.4       NOTICE OF STOCKHOLDERS' MEETINGS..............................2
           2.5       MANNER OF GIVING NOTICE; AFFIDAVIT OF NOTICE..................2
           2.6       QUORUM........................................................3
           2.7       ADJOURNED MEETING; NOTICE.....................................3
           2.8       VOTING........................................................3
           2.9       VALIDATION OF MEETING; WAIVER OF NOTICE.......................4
           2.10      STOCKHOLDER ACTION BY WRITTEN CONSENT WITHOUT A MEETING.......4
           2.11      RECORD DATE FOR STOCKHOLDER NOTICE; VOTING....................4
           2.12      PROXIES.......................................................5
           2.13      INSPECTORS OF ELECTION........................................5
           2.14      LIST OF STOCKHOLDERS ENTITLED TO VOTE.........................6
           2.15      ADVANCE NOTICE OF STOCKHOLDER NOMINATIONS.....................6
           2.16      ADVANCE NOTICE OF STOCKHOLDERS BUSINESS.......................7

ARTICLE III DIRECTORS..............................................................8

           3.1       POWERS........................................................8
           3.2       NUMBER OF DIRECTORS...........................................8
           3.3       ELECTION, QUALIFICATION AND TERM OF OFFICE OF DIRECTORS.......8
           3.4       RESIGNATION AND VACANCIES.....................................8
           3.5       PLACE OF MEETINGS; MEETINGS BY TELEPHONE......................9
           3.6       FIRST MEETINGS...............................................10
           3.7       REGULAR MEETINGS.............................................10
           3.8       SPECIAL MEETINGS; NOTICE.....................................10
           3.9       QUORUM.......................................................10
           3.10      WAIVER OF NOTICE.............................................11
           3.11      ADJOURNMENT..................................................11
           3.12      NOTICE OF ADJOURNMENT........................................11
           3.13      BOARD ACTION BY WRITTEN CONSENT WITHOUT A MEETING............11
</TABLE>



                                      -ii-

<PAGE>   3
                               TABLE OF CONTENTS
                                  (CONTINUED)


<TABLE>
<CAPTION>
                                                                                   PAGE
                                                                                   ----
<S>                                                                                <C>
           3.14      FEES AND COMPENSATION OF DIRECTORS............................11
           3.15      APPROVAL OF LOANS TO OFFICERS.................................12
           3.16      REMOVAL OF DIRECTORS..........................................12

ARTICLE IV COMMITTEES..............................................................12

           4.1       COMMITTEES OF DIRECTORS.......................................12
           4.2       COMMITTEE MINUTES.............................................13
           4.3       MEETINGS AND ACTION OF COMMITTEES.............................13

ARTICLE V OFFICERS.................................................................13

           5.1       OFFICERS......................................................13
           5.2       ELECTION OF OFFICERS..........................................14
           5.3       SUBORDINATE OFFICERS..........................................14
           5.4       REMOVAL AND RESIGNATION OF OFFICERS...........................14
           5.5       VACANCIES IN OFFICES..........................................14
           5.6       CHAIRMAN OF THE BOARD.........................................14
           5.7       CHIEF EXECUTIVE OFFICER.......................................14
           5.8       PRESIDENT.....................................................15
           5.9       CHIEF OPERATING OFFICER.......................................15
           5.10      CORPORATE VICE PRESIDENTS.....................................15
           5.11      SECRETARY.....................................................15
           5.12      CHIEF FINANCIAL OFFICER.......................................16
           5.13      TREASURER.....................................................16
           5.14      ADMINISTRATIVE VICE PRESIDENTS................................16
           5.15      AUTHORITY AND DUTIES OF OFFICERS..............................17

ARTICLE VI INDEMNITY...............................................................17

           6.1       INDEMNIFICATION OF DIRECTORS AND OFFICERS.....................17
           6.2       INDEMNIFICATION OF OTHERS.....................................17
           6.3       PAYMENT OF EXPENSES IN ADVANCE................................18
           6.4       INDEMNITY NOT EXCLUSIVE.......................................18
           6.5       INSURANCE INDEMNIFICATION.....................................18

ARTICLE VII RECORDS AND REPORTS....................................................19

           7.1       MAINTENANCE AND INSPECTION OF RECORDS.........................19
           7.2       MAINTENANCE AND INSPECTION OF BYLAWS..........................20
           7.3       MAINTENANCE AND INSPECTION OF OTHER CORPORATE RECORDS.........20
           7.4       INSPECTION BY DIRECTORS.......................................20
</TABLE>




                                     -iii-


<PAGE>   4
<TABLE>
<CAPTION>
                                                                                   PAGE
                                                                                   ----
<S>                                                                                <C>
           7.5       REPRESENTATION OF SHARES OF OTHER CORPORATIONS................21

ARTICLE VIII GENERAL MATTERS.......................................................21

           8.1       RECORD DATE FOR PURPOSES OTHER THAN NOTICE AND VOTING.........21
           8.2       CHECKS........................................................21
           8.3       EXECUTION OF CORPORATE CONTRACTS AND INSTRUMENTS..............21
           8.4       STOCK CERTIFICATES; PARTLY PAID SHARES........................22
           8.5       SPECIAL DESIGNATION ON CERTIFICATES...........................22
           8.6       LOST CERTIFICATES.............................................22
           8.7       CONSTRUCTION; DEFINITIONS.....................................23
           8.8       DIVIDENDS.....................................................23
           8.9       FISCAL YEAR...................................................23
           8.10      TRANSFER OF STOCK.............................................23
           8.11      STOCK TRANSFER AGREEMENTS.....................................23
           8.12      REGISTERED STOCKHOLDERS.......................................24

ARTICLE IX EMERGENCY PROVISIONS....................................................24

           9.1       GENERAL.......................................................24
           9.2       UNAVAILABLE DIRECTORS.........................................24
           9.3       AUTHORIZED NUMBER OF DIRECTORS................................24
           9.4       QUORUM........................................................24
           9.5       CREATION OF EMERGENCY COMMITTEE...............................25
           9.6       CONSTITUTION OF EMERGENCY COMMITTEE...........................25
           9.7       POWERS OF EMERGENCY COMMITTEE.................................25
           9.8       DIRECTORS BECOMING AVAILABLE..................................26
           9.9       ELECTION OF BOARD OF DIRECTORS................................26
           9.10      TERMINATION OF EMERGENCY COMMITTEE............................26

ARTICLE X AMENDMENTS...............................................................26


ARTICLE XI DISSOLUTION.............................................................26


ARTICLE XII CUSTODIAN..............................................................27

           12.1      APPOINTMENT OF A CUSTODIAN IN CERTAIN CASES...................27
           12.2      DUTIES OF CUSTODIAN...........................................28
</TABLE>



                                      -iv-

<PAGE>   5
                                     BYLAWS

                                       OF

                                  ADAPTEC, INC.


                                   ARTICLE I

                                CORPORATE OFFICES

           1.1 REGISTERED OFFICE

           The registered office of the corporation shall be fixed in the
certificate of incorporation of the corporation.

           1.2 OTHER OFFICES

           The board of directors may at any time establish other offices at any
place or places where the corporation is qualified to do business.

                                   ARTICLE II

                            MEETINGS OF STOCKHOLDERS

           2.1 PLACE OF MEETINGS

           Meetings of stockholders shall be held at any place, within or
outside the State of Delaware, designated by the board of directors. In the
absence of any such designation, stockholders' meetings shall be held at the
principal executive office of the corporation.

           2.2 ANNUAL MEETING

           The annual meeting of stockholders shall be held each year on a date
and at a time designated by the board of directors. In the absence of such
designation, the annual meeting of stockholders shall be held on the fourth
Thursday of August in each fiscal year at 9:30 a.m. However, if such day falls
on a legal holiday, then the meeting shall be held at the same time and place on
the next succeeding full business day. At the meeting, directors shall be
elected and any other proper business may be transacted.



<PAGE>   6

           2.3 SPECIAL MEETING

           A special meeting of the stockholders may be called at any time by
the board of directors, the chairman of the board, the chief executive officer,
the president or by one or more stockholders holding shares in the aggregate
entitled to cast not less than ten percent (10%) of the votes at that meeting.

           If a special meeting is called by any person or persons other than
the board of directors, then the request shall be in writing, specifying the
time of such meeting and the general nature of the business proposed to be
transacted, and shall be delivered personally or sent by registered mail or by
telegraphic or other facsimile transmission to the chairman of the board, the
chief executive officer, the president, the chief operating officer, any
corporate vice president or the secretary of the corporation. The officer
receiving the request shall cause notice to be promptly given to the
stockholders entitled to vote, in accordance with the provisions of Sections 2.4
and 2.5 of these bylaws, that a meeting will be held at the time requested by
the person or persons calling the meeting, so long as that time is not less than
thirty-five (35) nor more than sixty (60) days after the receipt of the request.
If the notice is not given within twenty (20) days after receipt of the request,
then the person or persons requesting the meeting may give the notice. Nothing
contained in this paragraph of this Section 2.3 shall be construed as limiting,
fixing or affecting the time when a meeting of stockholders called by action of
the board of directors may be held.

           2.4 NOTICE OF STOCKHOLDERS' MEETINGS

           All notices of meetings with stockholders shall be in writing and
shall be sent or otherwise given in accordance with Section 2.5 of these bylaws
not less than ten (10) (or, if sent by third-class mail pursuant to Section 2.5
of these bylaws, thirty (30)) nor more than sixty (60) days before the date of
the meeting to each stockholder entitled to vote at such meeting. The notice
shall specify the place, date, and hour of the meeting, and (I) in the case of a
special meeting, the general nature of the business to be transacted (no
business other than that specified in the notice may be transacted) or (ii) in
the case of the annual meeting, those matters which the board of directors, at
the time of giving the notice, intends to present for action by the stockholders
(but any proper matter may be presented at the meeting for such action). The
notice of any meeting at which directors are to be elected shall include the
name of any nominee or nominees who, at the time of the notice, management
intends to present for election.

           2.5 MANNER OF GIVING NOTICE; AFFIDAVIT OF NOTICE

           Written notice of any meeting of stockholders shall be given either
personally, by first-class mail, by third-class mail, but only if the
Corporation has outstanding shares held of record by five hundred (500) or more
persons, or by telegraphic or other written communication. Notices not
personally delivered shall be sent postage prepaid and shall be addressed to the
stockholder at the address of that stockholder appearing on the books of the
corporation or given by the stockholder to the corporation for the purpose of
notice. Notice shall be deemed to have been given at such time as



                                      -2-
<PAGE>   7
it is delivered personally or deposited in the mail or sent by telegram or other
means of written communication.

           An affidavit of the mailing or other means of giving any notice of
any stockholders' meeting, executed by the secretary, assistant secretary or any
transfer agent of the corporation giving the notice, shall be prima facie
evidence of the giving of such notice.

           2.6 QUORUM

           The holders of a majority of the shares entitled to vote, present in
person or represented by proxy, shall constitute a quorum for the transaction of
business at all meetings of stockholders, except as otherwise provided by
statute or by the certificate of incorporation. The stockholders present at a
duly called or held meeting at which a quorum is present may continue to do
business until adjournment, notwithstanding the withdrawal of enough
stockholders to leave less than a quorum, if any action taken (other than
adjournment) is approved by at least a majority of the shares required to
constitute a quorum.

           When a quorum is present at any meeting, the affirmative vote of
holders of a the majority of the stock having voting power present in person or
represented by proxy shall decide any question brought before such meeting,
unless the question is one upon which, by express provision of the laws of the
State of Delaware or of the certificate of incorporation or these bylaws, a
different vote is required, in which case such express provision shall govern
and control the decision of the question.

           2.7 ADJOURNED MEETING; NOTICE

           Any stockholders' meeting, annual or special, whether or not a quorum
is present, may be adjourned from time to time by the vote of the majority of
the shares represented at that meeting, either in person or by proxy, but in the
absence of a quorum, no other business may be transacted at that meeting, except
as provided in Section 2.6 of these bylaws.

           When any meeting of stockholders, either annual or special, is
adjourned to another time or place, unless these bylaws otherwise require,
notice need not be given of the adjourned meeting if the time and place thereof
are announced at the meeting at which the adjournment is taken. At the adjourned
meeting the corporation may transact any business that might have been
transacted at the original meeting. If the adjournment is for more than
forty-five (45) days, or if after the adjournment a new record date is fixed for
the adjourned meeting, a notice of the adjourned meeting shall be given to each
stockholder of record entitled to vote at the adjourned meeting in accordance
with the provisions of Sections 2.4 and 2.5 of these bylaws.

           2.8 VOTING

           The stockholders entitled to vote at any meeting of stockholders
shall be determined in accordance with the provisions of Section 2.11 of these
bylaws, subject to the provisions of



                                      -3-
<PAGE>   8
Sections 217 and 218 of the General Corporation Law of Delaware (relating to
voting rights of fiduciaries, pledgers and joint owners of stock and to voting
trusts and other voting agreements).

           Except as provided in the last paragraph of this Section 2.8, or as
may be otherwise provided in the certificate of incorporation, each stockholder
shall be entitled to one vote for each share of capital stock held by such
stockholder.

           On any matter other than the election of directors, any stockholder
may vote part of the shares in favor of the proposal and refrain from voting the
remaining shares or vote them against the proposal, but, if the stockholder
fails to specify the number of shares which the stockholder is voting
affirmatively, it will be conclusively presumed that the stockholder's approving
vote is with respect to all shares which the stockholder is entitled to vote.

           If a quorum is present, the affirmative vote of the majority of the
shares represented and voting at a duly-held meeting (which shares voting
affirmatively also constitute at least a majority of the required quorum) shall
be the act of the stockholders, unless the vote of a greater number, or voting
by classes, is required by law or by the certificate of incorporation.

           2.9 VALIDATION OF MEETING; WAIVER OF NOTICE

           Whenever notice is required to be given under any provision of the
General Corporation Law of Delaware or of the certificate of incorporation or
these bylaws, a written waiver thereof, signed by the person entitled to notice,
whether before or after the time stated therein, shall be deemed equivalent to
notice. Attendance of a person at a meeting shall constitute a waiver of notice
of such meeting, except when the person attends a meeting for the express
purpose of objecting, at the beginning of the meeting, to the transaction of any
business because the meeting is not lawfully called or convened. Neither the
business to be transacted at, nor the purpose of, any regular or special meeting
of the stockholders need be specified in any written waiver of notice unless so
required by the certificate of incorporation or these bylaws.

           2.10 STOCKHOLDER ACTION BY WRITTEN CONSENT WITHOUT A MEETING

           The stockholders of the corporation may not take action by written
consent without a meeting but must take any such actions at a duly called annual
or special meeting.

           2.11 RECORD DATE FOR STOCKHOLDER NOTICE; VOTING

           For purposes of determining the stockholders entitled to notice of
any meeting or to vote thereat, the board of directors may fix, in advance, a
record date, which shall not be more than sixty (60) days nor less than ten (10)
days before the date of any such meeting and in such event only stockholders of
record on the date so fixed are entitled to notice and to vote, notwithstanding
any transfer of any shares on the books of the corporation after the record
date.



                                      -4-
<PAGE>   9

           If the board of directors does not so fix a record date, the record
date for determining stockholders entitled to notice of or to vote at a meeting
of stockholders shall be at the close of business on the business day next
preceding the day on which notice is given or, if notice is waived, at the close
of business on the business day next preceding the day on which the meeting is
held.

           A determination of stockholders of record entitled to notice of or to
vote at a meeting of stockholders shall apply to any adjournment of the meeting
unless the board of directors fixes a new record date for the adjourned meeting,
but the board of directors shall fix a new record date if the meeting is
adjourned for more than thirty (30) days from the date set for the original
meeting.

           The record date for any other purpose shall be as provided in Section
8.1 of these bylaws.

           2.12 PROXIES

           Each stockholder entitled to vote at a meeting of stockholders may
authorize another person or persons to act for him by a written or electronic
proxy, executed by the stockholder and filed with the secretary of the
corporation, but no such proxy shall be voted or acted upon after three (3)
years from its date, unless the proxy provides for a longer period. A written
proxy shall be deemed executed if the stockholder's name is placed on the proxy
(whether by manual signature, typewriting, telegraphic transmission or
otherwise) by the stockholder or the stockholder's attorney-in-fact. An
electronic proxy (which may be transmitted via telephone, e-mail, the Internet
or such other electronic means as the Board of Directors may determine from time
to time) shall be deemed executed if the Company receives an appropriate
electronic transmission from the stockholder or the stockholder's
attorney-in-fact along with a pass code or other identifier which reasonably
establishes the stockholder or the stockholder's attorney-in-fact as the sender
of such transmission. The revocability of a proxy that states on its face that
it is irrevocable shall be governed by the provisions of Section 212(e) of the
General Corporation Law of Delaware.

           2.13 INSPECTORS OF ELECTION

           Before any meeting of stockholders, the board of directors shall
appoint one or more inspectors to act at the meeting and make a written report
thereof. The board of directors may designate one or more persons as alternate
inspectors to replace any inspector who fails to act. If no inspector or
alternate is able to act at a meeting of stockholders, the person presiding at
the meeting shall appoint one or more inspectors to act at the meeting.

           Such inspectors shall:

           (a) ascertain the number of shares outstanding and the voting power
of each;

           (b) determine the shares represented at a meeting and the validity of
proxies and ballots;

           (c) count all votes and ballots;

           (d) determine and retain for a reasonable period a record of the
disposition of any challenges made to any determination by the inspectors; and



                                      -5-
<PAGE>   10

           (e) certify their determination of the number of shares represented
at the meeting, and their count of all votes and ballots.

           The inspectors may appoint or retain other persons or entities to
assist the inspectors in the performance of the inspectors' duties.

           2.14 LIST OF STOCKHOLDERS ENTITLED TO VOTE

           The officer who has charge of the stock ledger of a corporation shall
prepare and make, at least ten (10) days before every meeting of stockholders, a
complete list of the stockholders entitled to vote at the meeting, arranged in
alphabetical order, and showing the address of each stockholder and the number
of shares registered in the name of each stockholder. Such list shall be open to
the examination of any stockholder, for any purpose germane to the meeting,
during ordinary business hours, for a period of at least ten (10) days prior to
the meeting, either at a place within the city where the meeting is to be held,
which place shall be specified in the notice of the meeting, or, if not so
specified, at the place where the meeting is to be held. The list shall also be
produced and kept at the time and place of the meeting during the whole time
thereof, and may be inspected by any stockholder who is present.

           2.15 ADVANCE NOTICE OF STOCKHOLDER NOMINATIONS

           Nominations of persons for election to the board of directors of the
corporation may be made at a meeting of stockholders by or at the direction of
the board of directors or by any stockholder of the corporation entitled to vote
in the election of directors at the meeting who complies with the notice
procedures set forth in this Section. Such nominations, 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 the corporation. To be timely, a
stockholder's notice shall be delivered to or mailed and received at the
principal executive offices of the corporation not less than twenty (20) 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. Such stockholder's notice shall set forth (a) as to each person, if any,
whom the stockholder proposes to nominate for election or re-election as a
director: (i) the name, age, business address and residence address of such
person, (ii) the principal occupation or employment of such person, (iii) the
class and number of shares of the corporation which are beneficially owned by
such person, (iv) any other information relating to such person that is required
by law to be disclosed in solicitations of proxies for election of directors,
and (v) such person's written consent to being named as a nominee and to serving
as a director if elected; and (b) as to the stockholder giving the notice: (i)
the name and address, as they appear on the corporation's books, of such
stockholder, (ii) the class and number of shares of the corporation which are
beneficially owned by such stockholder, and (iii) a description of all
arrangements or understandings between such stockholder and each nominee and any
other person or persons (naming such person or persons) relating to the
nomination. At the



                                      -6-
<PAGE>   11

request of the board of directors any person nominated by the board of directors
for election as a director shall furnish to the Secretary of the corporation
that information required to be set forth in the stockholder's notice of
nomination which pertains to the nominee. No person shall be eligible for
election as a director of the corporation unless nominated in accordance with
the procedures set forth in this Section. The chairman of the meeting shall, if
the facts warrant, determine and declare at the meeting that a nomination was
not made in accordance with the procedures prescribed by these bylaws, and if he
should so determine, he shall so declare at the meeting and the defective
nomination shall be disregarded.

           2.16 ADVANCE NOTICE OF STOCKHOLDERS BUSINESS

           At the annual meeting of the stockholders, only such business shall
be conducted as shall have been properly brought before the meeting. To be
properly brought before an annual meeting, business must be: (a) as specified in
the notice of meeting (or any supplement thereto) given by or at the direction
of the board of directors, (b) otherwise properly brought before the meeting by
or at the direction of the board of directors, or (c) otherwise properly brought
before the meeting by a stockholder. Business to be brought before the meeting
by a stockholder shall not be considered properly brought if the stockholder has
not given timely notice thereof in writing to the Secretary of the corporation.
To be timely, a stockholder's notice must be delivered to the principal
executive offices of the corporation not less than forty five (45) days prior to
the date on which the corporation first mailed proxy materials for the prior
year's annual meeting; provided, however, that if the corporation's annual
meeting of stockholders occurs on a date more than thirty (30) days earlier or
later than the corporation's prior year's annual meeting, then the corporation's
board of directors shall determine a date a reasonable period prior to the
corporation's annual meeting of stockholders by which date the stockholders
notice must be delivered and publicize such date in a filing pursuant to the
Securities Exchange Act of 1934, as amended, or via press release. Such
publication shall occur at least ten (10) days prior to the date set by the
Board of Directors. A stockholder's notice to the Secretary shall set forth as
to each matter the stockholder proposes to bring before the annual meeting: (i)
a brief description of the business desired to be brought before the annual
meeting and the reasons for conducting such business at the annual meeting, (ii)
the name and address of the stockholder proposing such business, (iii) the class
and number of shares of the corporation, which are beneficially owned by the
stockholder, (iv) any material interest of the stockholder in such business, and
(v) any other information that is required by law to be provided by the
stockholder in his capacity as proponent of a stockholder proposal.
Notwithstanding anything in these bylaws to the contrary, no business shall be
conducted at any annual meeting except in accordance with the procedures set
forth in this Section. The chairman of the annual meeting shall, if the facts
warrant, determine and declare at the meeting that business was not properly
brought before the meeting and in accordance with the provisions of this
Section, and, if he should so determine, he shall so declare at the meeting that
any such business not properly brought before the meeting shall not be
transacted.




                                      -7-
<PAGE>   12

                                  ARTICLE III

           DIRECTORS 3.1 POWERS

           Subject to the provisions of the General Corporation Law of Delaware
and any limitations in the certificate of incorporation or these bylaws relating
to action required to be approved by the stockholders or by the outstanding
shares, the business and affairs of the corporation shall be managed and all
corporate powers shall be exercised by or under the direction of the board of
directors.

           3.2 NUMBER OF DIRECTORS

           The authorized number of directors shall be ten (10). This number may
be changed by a duly adopted amendment to the certificate of incorporation or by
an amendment to this bylaw adopted by the vote or written consent of the holders
of a majority of the stock issued and outstanding and entitled to vote or by
resolution of a majority of the board of directors.

           No reduction of the authorized number of directors shall have the
effect of removing any director before that director's term of office expires.

           3.3 ELECTION, QUALIFICATION AND TERM OF OFFICE OF DIRECTORS

           Except as provided in Section 3.4 of these bylaws, directors shall be
elected at each annual meeting of stockholders to hold office until the next
annual meeting. Directors need not be stockholders unless so required by the
certificate of incorporation or these bylaws, wherein other qualifications for
directors may be prescribed. Each director, including a director elected to fill
a vacancy, shall hold office until his successor is elected and qualified or
until his earlier resignation or removal.

           Elections of directors need not be by written ballot.

           3.4 RESIGNATION AND VACANCIES

           Any director may resign effective on giving written notice to the
chairman of the board, the president, the secretary or the board of directors,
unless the notice specifies a later time for that resignation to become
effective. If the resignation of a director is effective at a future time, the
board of directors may elect a successor to take office when the resignation
becomes effective.

           Vacancies in the board of directors may be filled by a majority of
the remaining directors, even if less than a quorum, or by a sole remaining
director; provided, a vacancy created by the removal of a director by the vote
of the stockholders or by court order may be filled only by the



                                      -8-
<PAGE>   13

affirmative vote of a majority of the shares represented and voting at a duly
held meeting at which a quorum is present (which shares voting affirmatively
also constitute a majority of the required quorum). Each director so elected
shall hold office until the next annual meeting of the stockholders and until a
successor has been elected and qualified.

           A vacancy or vacancies in the board of directors shall be deemed to
exist in the event of the death, resignation or removal of any director, or if
the board of directors by resolution declares vacant the office of a director
who has been declared of unsound mind by an order of court or convicted of a
felony, or if the authorized number of directors is increased, or if the
stockholders fail, at any meeting of stockholders at which any director of
directors are elected, to elect the number of directors to be elected at that
meeting.

           The stockholders may elect a director or directors at any time to
fill any vacancy or vacancies not filled by the directors.

           If at any time, by reason of death or resignation or other cause, the
corporation should have no directors in office, then any officer or any
stockholder or an executor, administrator, trustee or guardian of a stockholder,
or other fiduciary entrusted with like responsibility for the person or estate
of a stockholder, may call a special meeting of stockholders in accordance with
the provisions of the certificate of incorporation or these bylaws, or may apply
to the Court of Chancery for a decree summarily ordering an election as provided
in Section 211 of the General Corporation Law of Delaware.

           If, at the time of filling any vacancy or any newly created
directorship, the directors then in office constitute less than a majority of
the whole board (as constituted immediately prior to any such increase), then
the Court of Chancery may, upon application of any stockholder or stockholders
holding at least ten (10) percent of the total number of the shares at the time
outstanding having the right to vote for such directors, summarily order an
election to be held to fill any such vacancies or newly created directorships,
or to replace the directors chosen by the directors then in office as aforesaid,
which election shall be governed by the provisions of Section 211 of the General
Corporation Law of Delaware as far as applicable.

           3.5 PLACE OF MEETINGS; MEETINGS BY TELEPHONE

           Regular meetings of the board of directors may be held at any place
within or outside the State of Delaware that has been designated from time to
time by resolution of the board. In the absence of such a designation, regular
meetings shall be held at the principal executive office of the corporation.
Special meetings of the board may be held at any place within or outside the
State of Delaware that has been designated in the notice of the meeting or, if
not stated in the notice or if there is no notice, at the principal executive
office of the corporation.




                                      -9-
<PAGE>   14

           Any meeting of the board, regular or special, may be held by
conference telephone or similar communication equipment, so long as all
directors participating in the meeting can hear one another; and all such
directors shall be deemed to be present in person at the meeting.

           3.6 FIRST MEETINGS

           The first meeting of each newly elected board of directors shall be
held at such time and place as shall be fixed by the vote of the stockholders at
the annual meeting and no notice of such meeting shall be necessary to the newly
elected directors in order legally to constitute the meeting, provided a quorum
shall be present. In the event of the failure of the stockholders to fix the
time or place of such first meeting of the newly elected board of directors, or
in the event such meeting is not held at the time and place so fixed by the
stockholders, the meeting may be held at such time and place as shall be
specified in a notice given as hereinafter provided for special meetings of the
board of directors, or as shall be specified in a written waiver signed by all
of the directors.

           3.7 REGULAR MEETINGS

           Regular meetings of the board of directors may be held without notice
at such time and at such place as shall from time to time be determined by the
board.

           3.8 SPECIAL MEETINGS; NOTICE

           Special meetings of the board of directors for any purpose or
purposes may be called at any time by the chairman of the board, the chief
executive officer, the president, the chief operating officer or any two (2)
directors.

           Notice of the date, time and place of special meetings shall be
delivered personally, by telephone, facsimile, telegram, electronic mail or
other comparable communication equipment to each director or sent by first-class
mail, charges prepaid, addressed to each director at that director's address as
it is shown on the records of the corporation. If the notice is mailed, it shall
be deposited in the United States mail at least four (4) days before the time of
the holding of the meeting. If the notice is delivered personally or by
telephone, facsimile, telegram, electronic mail or other comparable
communication equipment, it shall be delivered at least twelve (12) hours before
the time of the holding of the meeting. Any notice given personally or by
telephone, facsimile, telegram, electronic mail or other comparable
communication equipment may be communicated either to the director or to a
person at the office of the director who the person giving the notice has reason
to believe will promptly communicate it to the director. The notice need not
specify the purpose or the place of the meeting, if the meeting is to be held at
the principal executive office of the corporation.

           3.9 QUORUM

           A majority of the authorized number of directors shall constitute a
quorum for the transaction of business, except to adjourn as provided in Section
3.11 of these bylaws. Every act or decision



                                      -10-
<PAGE>   15
done or made by a majority of the directors present at a duly held meeting at
which a quorum is present shall be regarded as the act of the board of
directors, subject to the provisions of the certificate of incorporation and
applicable law.

           A meeting at which a quorum is initially present may continue to
transact business notwithstanding the withdrawal of directors, if any action
taken is approved by at least a majority of the required quorum for that
meeting.

           3.10 WAIVER OF NOTICE

           Whenever notice is required to be given under any provision of the
General Corporation Law of Delaware or of the certificate of incorporation or
these bylaws, a written waiver thereof, signed by the person entitled to notice,
whether before or after the time stated therein, shall be deemed equivalent to
notice. Attendance of a person at a meeting shall constitute a waiver of notice
of such meeting, except when the person attends a meeting for the express
purpose of objecting, at the beginning of the meeting, to the transaction of any
business because the meeting is not lawfully called or convened. Neither the
business to be transacted at, nor the purpose of, any regular or special meeting
of the directors, or members of a committee of directors, need be specified in
any written waiver of notice unless so required by the certificate of
incorporation or these bylaws.

           3.11 ADJOURNMENT

           A majority of the directors present, whether or not constituting a
quorum, may adjourn any meeting to another time and place.

           3.12 NOTICE OF ADJOURNMENT

           Notice of the time and place of holding an adjourned meeting need not
be given, unless the meeting is adjourned for more than twenty-four (24) hours,
in which case notice of the time and place shall be given before the time of the
adjourned meeting, in the manner specified in Section 3.8 of these bylaws, to
the directors who were not present at the time of the adjournment.

           3.13 BOARD ACTION BY WRITTEN CONSENT WITHOUT A MEETING

           Unless otherwise restricted by the certificate of incorporation or
these bylaws, any action required or permitted to be taken at any meeting of the
board of directors, or of any committee thereof, may be taken without a meeting
if all members of the board or committee, as the case may be, shall individually
or collectively consent thereto in writing. Such action by written consent shall
have the same force and effect as a unanimous vote of the board of directors.
Such written consent and any counterparts thereof shall be filed with the
minutes of the proceedings of the board.



                                      -11-
<PAGE>   16

           3.14 FEES AND COMPENSATION OF DIRECTORS

           Directors and members of committees may receive such compensation, if
any, for their services and such reimbursement of expenses as may be fixed or
determined by resolution of the board of directors. This Section 3.14 shall not
be construed to preclude any director from serving the corporation in any other
capacity as an officer, agent, employee or otherwise and receiving compensation
for those services.

           3.15 APPROVAL OF LOANS TO OFFICERS

           The corporation may lend money to, or guarantee any obligation of, or
otherwise assist any officer or other employee of the corporation or of its
subsidiary, including any officer or employee who is a director of the
corporation or its subsidiary, whenever, in the judgment of the directors, such
loan, guaranty or assistance may reasonably be expected to benefit the
corporation. The loan, guaranty or other assistance may be with or without
interest and may be unsecured, or secured in such manner as the board of
directors shall approve, including, without limitation, a pledge of shares of
stock of the corporation. Nothing in this section contained shall be deemed to
deny, limit or restrict the powers of guaranty or warranty of the corporation at
common law or under any statute.

           3.16 REMOVAL OF DIRECTORS

           Unless otherwise restricted by statute, by the certificate of
incorporation or by these bylaws, 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.

           No reduction of the authorized number of directors shall have the
effect of removing any director prior to the expiration of such director's term
of office.

                                   ARTICLE IV

                                   COMMITTEES

           4.1 COMMITTEES OF DIRECTORS

           The board of directors may, by resolution adopted by a majority of
the authorized number of directors, designate one (1) or more committees, each
consisting of two (2) or more directors, to serve at the pleasure of the board.
The board may designate one (1) or more directors as alternate members of any
committee, who may replace any absent member at any meeting of the committee.
The appointment of members or alternate members of a committee requires the vote
of a majority of the authorized number of directors. Any committee, to the
extent provided in the resolution of the board, shall have all the authority of
the board, except with respect to (I) amend the certificate of incorporation
(except that a committee may, to the extent authorized in the resolution or
resolutions



                                      -12-
<PAGE>   17

providing for the issuance of shares of stock adopted by the board of directors
as provided in Section 151(a) of the General Corporation Law of Delaware, fix
any of the preferences or rights of such shares relating to dividends,
redemption, dissolution, any distribution of assets of the corporation or the
conversion into, or the exchange of such shares for, shares of any other class
or classes or any other series of the same or any other class or classes of
stock of the corporation), (ii) adopt an agreement of merger or consolidation
under Sections 251 or 252 of the General Corporation Law of Delaware, (iii)
recommend to the stockholders the sale, lease or exchange of all or
substantially all of the corporation's property and assets, (iv) recommend to
the stockholders a dissolution of the corporation or a revocation of a
dissolution, or (v) adopt a certificate of ownership and merger pursuant to
Section 253 of the General Corporation Law of Delaware.

           4.2 COMMITTEE MINUTES

           Each committee shall keep regular minutes of its meetings and report
the same to the board of directors when required.

           4.3 MEETINGS AND ACTION OF COMMITTEES

           Meetings and actions of committees shall be governed by, and held and
taken in accordance with, the provisions of Article III of these bylaws, Section
3.5 (place of meetings and meetings by telephone), Section 3.7 (regular
meetings), Section 3.8 (special meetings and notice), Section 3.9 (quorum),
Section 3.10 (waiver of notice), Section 3.11 (adjournment), Section 3.12
(notice of adjournment), and Section 3.13 (action without a meeting), with such
changes in the context of those bylaws as are necessary to substitute the
committee and its members for the board of directors and its members; provided,
however, that the time of regular meetings of committees may also be called by
resolution of the board of directors and that notice of special meetings of
committees shall also be given to all alternate members, who shall have the
right to attend all meetings of the committee. The board of directors may adopt
rules for the government of any committee not inconsistent with the provisions
of these bylaws.

                                   ARTICLE V

                                    OFFICERS

           5.1 OFFICERS

           The officers of the corporation shall be a president, a secretary,
and a chief financial officer. The corporation may also have, at the discretion
of the board of directors, a chairman of the board, a chief executive officer, a
chief operating officer, a treasurer, one or more corporate vice presidents, one
or more assistant secretaries, one or more assistant treasurers, and any such
other officers as may be appointed in accordance with the provisions of Section
5.3 of these bylaws. Any number of offices may be held by the same person.



                                      -13-
<PAGE>   18

           In addition to the officers of the corporation described above, there
may also be such administrative vice presidents of the corporation as may be
designated and appointed from time to time by the chief executive officer of the
corporation in accordance with the provisions of Section 5.14 of these bylaws.

           5.2 ELECTION OF OFFICERS

           The officers of the corporation, except such officers as may be
appointed in accordance with the provisions of Sections 5.3 or 5.5 of these
bylaws, shall be chosen by the board of directors, subject to the rights, if
any, of an officer under any contract of employment.

           5.3 SUBORDINATE OFFICERS

           The board of directors may appoint, or empower the president to
appoint, such other officers and agents as the business of the corporation may
require, each of whom shall hold office for such period, have such authority,
and perform such duties as are provided in these bylaws or as the board of
directors may from time to time determine.

           5.4 REMOVAL AND RESIGNATION OF OFFICERS

           Subject to the rights, if any, of an officer under any contract of
employment, any officer may be removed, either with or without cause, by an
affirmative vote of the majority of the board of directors at any regular or
special meeting of the board or, except in the case of an officer chosen by the
board of directors, by any officer upon whom such power of removal may be
conferred by the board of directors.

           Any officer may resign at any time by giving written notice to the
corporation. Any resignation shall take effect at the date of the receipt of
that notice or at any later time specified in that notice; and, unless otherwise
specified in that notice, the acceptance of the resignation shall not be
necessary to make it effective. Any resignation is without prejudice to the
rights, if any, of the corporation under any contract to which the officer is a
party.

           5.5 VACANCIES IN OFFICES

           A vacancy in any office because of death, resignation, removal,
disqualification or any other cause shall be filled in the manner prescribed in
these bylaws for regular appointments to that office.

           5.6 CHAIRMAN OF THE BOARD

           The chairman of the board, if such an officer be elected, shall, if
present, preside at meetings of the board of directors and exercise and perform
such other powers and duties as may from time to time be assigned to him by the
board of directors or as may be prescribed by these bylaws. If there is no chief
executive officer, then the chairman of the board shall also have the powers and
duties prescribed in Section 5.7 of these bylaws.



                                      -14-
<PAGE>   19

           5.7 CHIEF EXECUTIVE OFFICER

           Subject to such supervisory powers, if any, as may be given by the
board of directors to the chairman of the board, if there be such an officer,
the chief executive officer of the corporation shall, subject to the control of
the board of directors, have general supervision, direction, and control of the
business and the officers of the corporation. He shall preside at all meetings
of the stockholders and, in the absence of the chairman of the board, or if
there be none, at all meetings of the board of directors. He shall have the
general powers and duties of management usually vested in the office of
president of a corporation and shall have such other powers and duties as may be
prescribed by the board of directors or these bylaws.

           5.8 PRESIDENT

           The president of the corporation shall have such powers and perform
such duties as prescribed by the board of directors or these bylaws. In the
absence or disability of the chief executive officer or if there be no such
officer, then the president shall have the same powers and be subject to the
same restrictions set forth in Section 5.7.

           5.9 CHIEF OPERATING OFFICER

           The chief operating officer shall have such powers and perform such
duties as prescribed by the board of directors or these bylaws. In the absence
or disability of the chief executive officer, if there be such an officer, the
president and the chairman of the board, the chief operating officer shall
perform the duties of chief executive officer and president, and when so acting
shall have all the powers, and be subject to all the restrictions set forth in
Section 5.7.

           5.10 CORPORATE VICE PRESIDENTS

           In the absence or disability of the chief executive officer, if there
be such an officer, the president, the chairman of the board and the chief
operating officer, if there be such an officer, the corporate vice presidents,
if any, in order of their rank as fixed by the board of directors or, if not
ranked, a corporate vice president designated by the board of directors, shall
perform all the duties of the chief executive officer and president and when so
acting shall have all the powers of, and be subject to all the restrictions
upon, the chief executive officer and president. The corporate vice presidents
shall also have such other powers and perform such other duties as from time to
time may be prescribed for them respectively by the board of directors or these
bylaws.

           5.11 SECRETARY

           The secretary shall keep or cause to be kept, at the principal
executive office of the corporation, or such other place as the board of
directors may direct, a book of minutes of all meetings and actions of
directors, committees of directors, and stockholders, with the time and place of
holding, whether regular or special (and, if special, how authorized and the
notice given), the



                                      -15-
<PAGE>   20
names of those present at directors' meetings or committee meetings, the number
of shares present or represented at stockholders' meetings, and the proceedings
thereof.

           The secretary shall keep, or cause to be kept, at the principal
executive office of the corporation or at the office of the corporation's
transfer agent or registrar, as determined by resolution of the board of
directors, a share register, or a duplicate share register, showing the names of
all stockholders and their addresses, the number and classes of shares held by
each, the number and date of certificates evidencing such shares, and the number
and date of cancellation of every certificate surrendered for cancellation.

           The secretary shall give, or cause to be given, notice of all
meetings of the stockholders and of the board of directors required by these
bylaws or by law to be given, and he shall keep the seal of the corporation, if
one be adopted, in safe custody and shall have such other powers and perform
such other duties as may be prescribed by the board of directors or by these
bylaws.

           5.12 CHIEF FINANCIAL OFFICER

           The chief financial officer shall keep and maintain, or cause to be
kept and maintained, adequate and correct books and records of accounts of the
properties and business transactions of the corporation, including accounts of
its assets, liabilities, receipts, disbursements, gains, losses, capital,
retained earnings and shares. The books of account shall at all reasonable times
be open to inspection by any director.

           The chief financial officer shall deposit all money and other
valuables in the name and to the credit of the corporation with such
depositories as may be designated by the board of directors. He shall disburse
the funds of the corporation as may be ordered by the board of directors, shall
render to the president and directors, whenever they request it, an account of
all of his transactions as chief financial officer and of the financial
condition of the corporation, and shall have such other powers and perform such
other duties as may be prescribed by the board of directors or these bylaws.

           5.13 TREASURER

           In the absence or disability of the chief financial officer, the
treasurer shall perform all the duties of the chief financial officer and when
so acting shall have all the powers of, and be subject to all the restrictions
upon, the chief financial officer. The treasurer shall have such other powers
and perform such other duties as from time to time may be prescribed
respectively by the board of directors or these bylaws.

           5.14 ADMINISTRATIVE VICE PRESIDENTS

           In addition to the corporate vice presidents of the corporation as
provided in Section 5.10 of these bylaws and such subordinate officers as may be
appointed in accordance with section 5.3 of these bylaws, there may also be such
administrative vice presidents of the corporation as may be designated and
appointed from time to time by the chief executive officer of the corporation.




                                      -16-
<PAGE>   21

Administrative vice presidents shall perform such duties and have such powers as
from time to time may be determined by the chief executive officer or the board
of directors in order to assist the officers of the corporation in the
furtherance of their duties. In the performance of such duties and the exercise
of such powers, however, such administrative vice presidents shall have limited
authority to act on behalf of the corporation as the board of directors shall
establish, including but not limited to limitations on the dollar amount and on
the scope of the agreements or commitments that may be made by such
administrative vice presidents on behalf of the corporation, which limitations
may not be exceeded by such individuals or altered by the chief executive
officer without further approval by the board of directors.

           5.15 AUTHORITY AND DUTIES OF OFFICERS

           In addition to the foregoing authority and duties, all officers of
the corporation shall respectively have such authority and perform such duties
in the management of the business of the corporation as may be designated from
time to time by the board of directors or the stockholders.

                                   ARTICLE VI

                                    INDEMNITY

           6.1 INDEMNIFICATION OF DIRECTORS AND OFFICERS

           The corporation shall, to the maximum extent and in the manner
permitted by the General Corporation Law of Delaware as the same now exists or
may hereafter be amended, indemnify any person against expenses (including
attorneys' fees), judgments, fines, and amounts paid in settlement actually and
reasonably incurred in connection with any threatened, pending or completed
action, suit, or proceeding in which such person was or is a party or is
threatened to be made a party by reason of the fact that such person is or was a
director or officer of the corporation. For purposes of this Section 6.1, a
"director" or "officer" of the corporation shall mean any person (I) who is or
was a director or officer of the corporation, (ii) who is or was serving at the
request of the corporation as a director or officer of another corporation,
partnership, joint venture, trust or other enterprise, or (iii) who was a
director or officer of a corporation which was a predecessor corporation of the
corporation or of another enterprise at the request of such predecessor
corporation.

           The corporation shall be required to indemnify a director or officer
in connection with an action, suit, or proceeding (or part thereof) initiated by
such director or officer only if the initiation of such action, suit, or
proceeding (or part thereof) by the director or officer was authorized by the
board of Directors of the corporation.

           Any repeal or modification of the foregoing provisions of this
Article shall not adversely affect any right or protection hereunder of any
person in respect of any act or omission occurring prior to the time of such
repeal or modification.



                                      -17-
<PAGE>   22

           6.2 INDEMNIFICATION OF OTHERS

           The corporation shall have the power, to the maximum extent and in
the manner permitted by the General Corporation Law of Delaware as the same now
exists or may hereafter be amended, to indemnify each of its employees and
agents (other than directors and officers) against expenses (including
attorneys' fees), judgments, fines, and amounts paid in settlement actually and
reasonably incurred in connection with any threatened, pending or completed
action, suit, or proceeding, in which such person was or is a party or is
threatened to be made a party by reason of the fact that such person is or was
an employee or agent of the corporation. For purposes of this Section 6.2, an
"employee" or "agent" of the corporation (other than a director or officer)
shall mean any person (I) who is or was an employee or agent of the corporation,
(ii) who is or was serving at the request of the corporation as an employee or
agent of another corporation, partnership, joint venture, trust or other
enterprise, or (iii) who was an employee or agent of a corporation which was a
predecessor corporation of the corporation or of another enterprise at the
request of such predecessor corporation.

           6.3 PAYMENT OF EXPENSES IN ADVANCE

           The corporation shall pay the expenses (including attorney's fees)
incurred by a director or officer of the corporation entitled to indemnification
hereunder in defending any action, suit or proceeding referred to in this
Section 6.1 in advance of its final disposition; provided, however, that payment
of expenses incurred by a director or officer of the corporation in advance of
the final disposition of such action, suit or proceeding shall be made only upon
receipt of an undertaking by the director or officer to repay all amounts
advanced if it should ultimately be determined that the director or officer is
not entitled to be indemnified under this Section 6.1 or otherwise.

           6.4 INDEMNITY NOT EXCLUSIVE

           The rights conferred on any person by this Article shall not be
exclusive of any other rights which such person may have or hereafter acquire
under any statute, provision of the corporation's Certificate of Incorporation,
these bylaws, agreement, vote of the stockholders or disinterested directors or
otherwise.

           6.5 INSURANCE INDEMNIFICATION

           The corporation may purchase and maintain insurance on behalf of any
person who is or was a director, officer, employee or agent of the corporation,
or is or was serving at the request of the corporation as a director, officer,
employee or agent of another corporation, partnership, joint venture, trust or
other enterprise against any liability asserted against him or her and incurred
by him or her in any such capacity, or arising out of his or her status as such,
whether or not the corporation would have the power to indemnify him or her
against such liability under the provisions of the General Corporation Law of
Delaware.



                                      -18-
<PAGE>   23

                                  ARTICLE VII

                               RECORDS AND REPORTS

           7.1 MAINTENANCE AND INSPECTION OF RECORDS

           The corporation shall, either at its principal executive office or at
such place or places as designated by the board of directors, keep a record of
its stockholders listing their names and addresses and the number and class of
shares held by each stockholder.

           Any stockholder of record, in person or by attorney or other agent,
shall, upon written demand under oath stating the purpose thereof, have the
right during the usual hours for business to inspect for any proper purpose the
corporation's stock ledger and a list of its stockholders and to make copies or
extracts therefrom. A proper purpose shall mean a purpose reasonably related to
such person's interest as a stockholder. In every instance where an attorney or
other agent is the person who seeks the right to inspection, the demand under
oath shall be accompanied by a power of attorney or such other writing that
authorizes the attorney or other agent to so act on behalf of the stockholder.
The demand under oath shall be directed to the corporation at its registered
office in Delaware or at its principal place of business.

           The officer who has charge of the stock ledger of a corporation shall
prepare and make, at least ten (10) days before every meeting of stockholders, a
complete list of the stockholders entitled to vote at the meeting, arranged in
alphabetical order, and showing the address of each stockholder and the number
of shares registered in the name of each stockholder. Such list shall be open to
the examination of any stockholder, for any purpose germane to the meeting,
during ordinary business hours, for a period of at least ten (10) days prior to
the meeting, either at a place within the city where the meeting is to be held,
which place shall be specified in the notice of the meeting, or, if not so
specified, at the place where the meeting is to be held. The list shall also be
produced and kept at the time and place of the meeting during the whole time
thereof, and may be inspected by any stockholder who is present.

           The record of stockholders shall also be open to inspection on the
written demand of any stockholder or holder of a voting trust certificate, at
any time during usual business hours, for a purpose reasonably related to the
holder's interests as a stockholder or as the holder of a voting trust
certificate.

           Any inspection and copying under this Section 7.1 may be made in
person or by an agent or attorney of the stockholder or holder of a voting trust
certificate making the demand.



                                      -19-
<PAGE>   24

           7.2 MAINTENANCE AND INSPECTION OF BYLAWS

           The corporation shall keep at its principal executive office, or if
its principal executive office is not in the State of California, at its
principal business office in such state, the original or a copy of these bylaws
as amended to date, which bylaws shall be subject to inspection by the
stockholders at all reasonable times during office hours. If the principal
executive office of the corporation is outside the State of California and the
corporation has no principal business office in such state, the secretary shall,
upon the written request of any stockholder, furnish to that stockholder a copy
of these bylaws as amended to date.

           7.3 MAINTENANCE AND INSPECTION OF OTHER CORPORATE RECORDS

           The accounting books and records, and the minutes of proceedings of
the stockholders and the board of directors and any committee or committees of
the board of directors, shall be kept at such place or places designated by the
board of directors or, in absence of such designation, at the principal
executive office of the corporation. The minutes shall be kept in written form
and the accounting books and records shall be kept either in written form or in
any other form capable of being converted into written form.

           The minutes and accounting books and records shall be open to
inspection upon the written demand of any stockholder or holder of a voting
trust certificate, at any reasonable time during usual business hours, for a
purpose reasonably related to the holder's interests as a stockholder or as the
holder of a voting trust certificate. The inspection may be made in person or by
an agent or attorney, and shall include the right to copy and make extracts.
Such rights of inspection shall extend to the records of each subsidiary
corporation of the corporation.

           7.4 INSPECTION BY DIRECTORS

           Every director shall have the absolute right at any reasonable time
to inspect all books, records and documents of every kind and the physical
properties of the corporation and each of its subsidiary corporations. Such
inspection by a director may be made in person or by an agent or attorney, and
the right of inspection includes the right to copy and make extracts of
documents.

           The corporation shall also, on the written request of any
stockholder, mail to the stockholder a copy of the last annual, semi-annual or
quarterly income statement which it has prepared, and a balance sheet as of the
end of that period.

           The quarterly income statements and balance sheets referred to in
this section shall be accompanied by the report, if any, of any independent
accountants engaged by the corporation or the certificate of an authorized
officer of the corporation that the financial statements were prepared without
audit from the books and records of the corporation.


                                      -20-
<PAGE>   25


           7.5 REPRESENTATION OF SHARES OF OTHER CORPORATIONS

           The chairman of the board, the chief executive officer, the
president, the chief operating officer, any corporate vice president, the
treasurer, the secretary or the chief financial officer of this corporation, or
any other person authorized by the board of directors or the president or a vice
president, is authorized to vote, represent, and exercise on behalf of this
corporation all rights incident to any and all shares of any other corporation
or corporations standing in the name of this corporation. The authority granted
herein may be exercised either by such person directly or by any other person
authorized to do so by proxy or power of attorney duly executed by such person
having the authority.

                                  ARTICLE VIII

                                 GENERAL MATTERS

           8.1 RECORD DATE FOR PURPOSES OTHER THAN NOTICE AND VOTING

           For purposes of determining the stockholders entitled to receive
payment of any dividend or other distribution or allotment of any rights or the
stockholders entitled to exercise any rights in respect of any other lawful
action, the board of directors may fix, in advance, a record date, which shall
not be more than sixty (60) days before any such action. In that case, only
stockholders of record at the close of business on the date so fixed are
entitled to receive the dividend, distribution or allotment of rights, or to
exercise such rights, as the case may be, notwithstanding any transfer of any
shares on the books of the corporation after the record date so fixed, except as
otherwise provided by law.

           If the board of directors does not so fix a record date, then the
record date for determining stockholders for any such purpose shall be at the
close of business on the day on which the board adopts the applicable
resolution, or the sixtieth (60th) day before the date of that action, whichever
is later.

           8.2 CHECKS

           From time to time, the board of directors shall determine by
resolution which person or persons may sign or endorse all checks, drafts, other
orders for payment of money, notes or other evidences of indebtedness that are
issued in the name of or payable to the corporation, and only the persons so
authorized shall sign or endorse those instruments.

           8.3 EXECUTION OF CORPORATE CONTRACTS AND INSTRUMENTS

           The board of directors, except as otherwise provided in these bylaws,
may authorize any officer or officers, or agent or agents, to enter into any
contract or execute any instrument in the



                                      -21-
<PAGE>   26
name of and on behalf of the corporation; such authority may be general or
confined to specific instances. Unless so authorized or ratified by the board of
directors or within the agency power of an officer, no officer, agent or
employee shall have any power or authority to bind the corporation by any
contract or engagement or to pledge its credit or to render it liable for any
purpose or for any amount.

           8.4 STOCK CERTIFICATES; PARTLY PAID SHARES

           The shares of a corporation shall be represented by certificates,
provided that the board of directors of the corporation may provide by
resolution or resolutions that some or all of any or all classes or series of
its stock shall be uncertificated shares. Any such resolution shall not apply to
shares represented by a certificate until such certificate is surrendered to the
corporation. Notwithstanding the adoption of such a resolution by the board of
directors, every holder of stock represented by certificates and upon request
every holder of uncertificated shares shall be entitled to have a certificate
signed by, or in the name of the corporation by the chairman or vice-chairman of
the board of directors, or the president or vice-president, and by the chief
financial officer or an assistant treasurer, or the secretary or an assistant
secretary of such corporation representing the number of shares registered in
certificate form. Any or all of the signatures on the certificate may be a
facsimile. In case any officer, transfer agent or registrar who has signed or
whose facsimile signature has been placed upon a certificate has ceased to be
such officer, transfer agent or registrar before such certificate is issued, it
may be issued by the corporation with the same effect as if he were such
officer, transfer agent or registrar at the date of issue.

           The corporation may issue the whole or any part of its shares as
partly paid and subject to call for the remainder of the consideration to be
paid therefor. Upon the face or back of each stock certificate issued to
represent any such partly paid shares, upon the books and records of the
corporation in the case of uncertificated partly paid shares, the total amount
of the consideration to be paid therefor and the amount paid thereon shall be
stated. Upon the declaration of any dividend on fully paid shares, the
corporation shall declare a dividend upon partly paid shares of the same class,
but only upon the basis of the percentage of the consideration actually paid
thereon.

           8.5 SPECIAL DESIGNATION ON CERTIFICATES

           If the corporation is authorized to issue more than one class of
stock or more than one series of any class, then the powers, the designations,
the preferences, and the relative, participating, optional or other special
rights of each class of stock or series thereof and the qualifications,
limitations or restrictions of such preferences and/or rights shall be set forth
in full or summarized on the face or back of the certificate that the
corporation shall issue to represent such class or series of stock; provided,
however, that, except as otherwise provided in Section 202 of the General
Corporation Law of Delaware, in lieu of the foregoing requirements there may be
set forth on the face or back of the certificate that the corporation shall
issue to represent such class or series of stock a statement that the
corporation will furnish without charge to each stockholder who so requests the
powers, the designations, the preferences, and the relative, participating,
optional or other special



                                      -22-
<PAGE>   27

rights of each class of stock or series thereof and the qualifications,
limitations or restrictions of such preferences and/or rights.

           8.6 LOST CERTIFICATES

           Except as provided in this Section 8.6, no new certificates for
shares shall be issued to replace a previously issued certificate unless the
latter is surrendered to the corporation and canceled at the same time. The
corporation may issue a new certificate of stock or uncertificated shares in the
place of any certificate theretofore issued by it, alleged to have been lost,
stolen or destroyed, and the corporation may require the owner of the lost,
stolen or destroyed certificate, or his legal representative, to give the
corporation a bond sufficient to indemnify it against any claim that may be made
against it on account of the alleged loss, theft or destruction of any such
certificate or the issuance of such new certificate or uncertificated shares.

           8.7 CONSTRUCTION; DEFINITIONS

           Unless the context requires otherwise, the general provisions, rules
of construction, and definitions in the Delaware General Corporation Law shall
govern the construction of these bylaws. Without limiting the generality of this
provision, the singular number includes the plural, the plural number includes
the singular, and the term "person" includes both a corporation and a natural
person.

           8.8 DIVIDENDS

           The directors of the corporation, subject to any restrictions
contained in the certificate of incorporation, may declare and pay dividends
upon the shares of its capital stock pursuant to the General Corporation Law of
Delaware. Dividends may be paid in cash, in property, or in shares of the
corporation's capital stock.

           The directors of the corporation may set apart out of any of the
funds of the corporation available for dividends a reserve or reserves for any
proper purpose and may abolish any such reserve. Such purposes shall include but
not be limited to equalizing dividends, repairing or maintaining any property of
the corporation, and meeting contingencies.

           8.9 FISCAL YEAR

           The fiscal year of the corporation shall be fixed by resolution of
the board of directors and may be changed by the board of directors.

           8.10 TRANSFER OF STOCK

           Upon surrender to the corporation or the transfer agent of the
corporation of a certificate for shares duly endorsed or accompanied by proper
evidence of succession, assignation or authority to



                                      -23-
<PAGE>   28
transfer, it shall be the duty of the corporation to issue a new certificate to
the person entitled thereto, cancel the old certificate, and record the
transaction in its books.

           8.11 STOCK TRANSFER AGREEMENTS

           The corporation shall have power to enter into and perform any
agreement with any number of stockholders of any one or more classes of stock of
the corporation to restrict the transfer of shares of stock of the corporation
of any one or more classes owned by such stockholders in any manner not
prohibited by the General Corporation Law of Delaware.

           8.12 REGISTERED STOCKHOLDERS

           The corporation shall be entitled to recognize the exclusive right of
a person registered on its books as the owner of shares to receive dividends and
to vote as such owner, shall be entitled to hold liable for calls and
assessments the person registered on its books as the owner of shares, and shall
not be bound to recognize any equitable or other claim to or interest in such
share or shares on the part of another person, whether or not it shall have
express or other notice thereof, except as otherwise provided by the laws of
Delaware.

                                   ARTICLE IX

                              EMERGENCY PROVISIONS

           9.1 GENERAL

           The provisions of this Article shall be operative only during a
national emergency declared by the President of the United States or the person
performing the President's functions, or in the event of a nuclear, atomic, or
other attack on the United States or a disaster making it impossible or
impracticable for the corporation to conduct its business without recourse to
the provisions of this Article. The provisions of this Article in that event
shall override all other Bylaws of the corporation in conflict with any
provisions of this Article, and shall remain operative so long as it remains
impossible or impracticable to continue the business of the corporation
otherwise, but thereafter shall be inoperative; provided that all actions taken
in good faith pursuant to such provisions shall thereafter remain in full force
and effect unless and until revoked by action taken pursuant to the provisions
of the bylaws other than those contained in this Article.

           9.2 UNAVAILABLE DIRECTORS

           All directors of the corporation who are not available to perform
their duties as directors by reason of physical or mental incapacity or for any
other reason or who are unwilling to perform their duties or whose whereabouts
are unknown shall automatically cease to be directors, with like effect as if
they had resigned as directors, so long as such unavailability continues.



                                      -24-
<PAGE>   29

           9.3 AUTHORIZED NUMBER OF DIRECTORS

           The authorized number of directors shall be the number of directors
remaining after eliminating those who have ceased to be directors pursuant to
Section 9.2 of these bylaws, or the minimum number required by law, whichever
number is greater.

           9.4 QUORUM

           The number of directors necessary to constitute a quorum shall be
one-third of the authorized number of directors as specified in Section 9.3 of
these bylaws, or such other minimum number as, pursuant to the law or lawful
decree then in force, it is possible for the bylaws of a corporation to specify.

           9.5 CREATION OF EMERGENCY COMMITTEE

           If the number of directors remaining after eliminating those who have
ceased to be directors pursuant to Section 9.2 of these bylaws is less than the
minimum number of authorized directors required by law, then until the
appointment of additional directors to make up such required minimum, all the
powers and authority which the board of directors could by law delegate,
including all powers and authority which the board of directors could delegate
to a committee, shall be automatically vested in an emergency committee, and the
emergency committee shall thereafter manage the affairs of the corporation
pursuant to such powers and authority and shall have all such other powers and
authority as law or lawful decree may confer on any person or body of persons
during a period of emergency.

           9.6 CONSTITUTION OF EMERGENCY COMMITTEE

           The emergency committee shall consist of all the directors remaining
after eliminating those who have ceased to be directors pursuant to Section 9.2
of these bylaws, provided that those remaining directors are not less than three
in number. If the remaining directors number less than three, the emergency
committee shall consist of three persons, who shall be the remaining director or
directors and either one or two officers or employees of the corporation, as the
remaining director or directors may in writing designate. If there is no
remaining director, the emergency committee shall consist of the three most
senior officers of the corporation who are available to serve, and if and to the
extent that officers are not available, the most senior employees of the
corporation. Seniority shall be determined in accordance with any designation of
seniority in the minutes of the proceedings of the board of directors, and in
the absence of such designation, shall be determined by rate of remuneration. If
there are no remaining directors and no officers or employees of the corporation
available, the emergency committee shall consist of three persons designated in
writing by the stockholder owning the largest number of shares of record as of
the date of the last record date.




                                      -25-
<PAGE>   30

           9.7 POWERS OF EMERGENCY COMMITTEE

           The emergency committee, once appointed, shall govern its own
procedures and shall have power to increase the number of members thereof beyond
the original number, and if a vacancy or vacancies therein arises at any time,
the remaining member or members of the emergency committee shall have the power
to fill such vacancy or vacancies. If, at any time after its appointment, all
members of the emergency committee shall die or resign or become unavailable to
act for any reason whatsoever, a new emergency committee shall be appointed in
accordance with the foregoing provisions of this Article.

           9.8 DIRECTORS BECOMING AVAILABLE

           Any person who has ceased to be a director pursuant to the provisions
of Section 9.2 of these bylaws and who thereafter becomes available to serve as
a director shall automatically become a member of the emergency committee.

           9.9 ELECTION OF BOARD OF DIRECTORS

           The emergency committee shall, as soon after its appointment as is
practicable, take all requisite action to secure the election of a board of
directors, and, upon such election, all the powers and authorities of the
emergency committee shall cease.

           9.10 TERMINATION OF EMERGENCY COMMITTEE

           If after the appointment of an emergency committee, a sufficient
number of persons who ceased to be directors pursuant to Section 9.2 of these
bylaws become available to serve as directors, so that if they had not ceased to
be directors as aforesaid, there would be enough directors to constitute the
minimum number of directors required by law, then all such persons shall
automatically be deemed to be reappointed as directors and the powers and
authorities of the emergency committee shall be at an end.

                                   ARTICLE X

                                   AMENDMENTS

           The original or other bylaws of the corporation may be adopted,
amended or repealed by the stockholders entitled to vote; provided, however,
that the corporation may, in its certificate of incorporation, confer the power
to adopt, amend or repeal bylaws upon the directors. The fact that such power
has been so conferred upon the directors shall not divest the stockholders of
the power, nor limit their power to adopt, amend or repeal bylaws.



                                      -26-
<PAGE>   31

                                   ARTICLE XI

                                   DISSOLUTION

           If it should be deemed advisable in the judgment of the board of
directors of the corporation that the corporation should be dissolved, the
board, after the adoption of a resolution to that effect by a majority of the
whole board at any meeting called for that purpose, shall cause notice to be
mailed to each stockholder entitled to vote thereon of the adoption of the
resolution and of a meeting of stockholders to take action upon the resolution.

           At the meeting a vote shall be taken for and against the proposed
dissolution. If a majority of the outstanding stock of the corporation entitled
to vote thereon votes for the proposed dissolution, then a certificate stating
that the dissolution has been authorized in accordance with the provisions of
Section 275 of the General Corporation Law of Delaware and setting forth the
names and residences of the directors and officers shall be executed,
acknowledged, and filed and shall become effective in accordance with Section
103 of the General Corporation Law of Delaware. Upon such certificate's becoming
effective in accordance with Section 103 of the General Corporation Law of
Delaware, the corporation shall be dissolved.

           Whenever all the stockholders entitled to vote on a dissolution
consent in writing, either in person or by duly authorized attorney, to a
dissolution, no meeting of directors or stockholders shall be necessary. The
consent shall be filed and shall become effective in accordance with Section 103
of the General Corporation Law of Delaware. Upon such consent's becoming
effective in accordance with Section 103 of the General Corporation Law of
Delaware, the corporation shall be dissolved. If the consent is signed by an
attorney, then the original power of attorney or a photocopy thereof shall be
attached to and filed with the consent. The consent filed with the Secretary of
State shall have attached to it the affidavit of the secretary or some other
officer of the corporation stating that the consent has been signed by or on
behalf of all the stockholders entitled to vote on a dissolution; in addition,
there shall be attached to the consent a certification by the secretary or some
other officer of the corporation setting forth the names and residences of the
directors and officers of the corporation.

                                  ARTICLE XII

                                    CUSTODIAN

           12.1 APPOINTMENT OF A CUSTODIAN IN CERTAIN CASES

           The Court of Chancery, upon application of any stockholder, may
appoint one or more persons to be custodians and, if the corporation is
insolvent, to be receivers, of and for the corporation when:



                                      -27-

<PAGE>   32

               (i) at any meeting held for the election of directors the
stockholders are so divided that they have failed to elect successors to
directors whose terms have expired or would have expired upon qualification of
their successors; or

               (ii) the business of the corporation is suffering or is
threatened with irreparable injury because the directors are so divided
respecting the management of the affairs of the corporation that the required
vote for action by the board of directors cannot be obtained and the
stockholders are unable to terminate this division; or

               (iii) the corporation has abandoned its business and has failed
within a reasonable time to take steps to dissolve, liquidate or distribute its
assets.


           12.2 DUTIES OF CUSTODIAN

           The custodian shall have all the powers and title of a receiver
appointed under Section 291 of the General Corporation Law of Delaware, but the
authority of the custodian shall be to continue the business of the corporation
and not to liquidate its affairs and distribute its assets, except when the
Court of Chancery otherwise orders and except in cases arising under Sections
226(a)(3) or 352(a)(2) of the General Corporation Law of Delaware.




                                      -28-

<PAGE>   1
                                   ADAPTEC, INC.                    EXHIBIT 10.6

                           1990 DIRECTORS' OPTION PLAN

                            (as amended August, 1998)

           1. Purposes of the Plan. The purposes of this Directors' Option Plan
are to attract and retain the best available personnel for service as Directors
of the Company, to provide additional incentive to the Outside Directors of the
Company to serve as Directors, and to encourage their continued service on the
Board.

                   All options granted hereunder shall be "non-statutory stock
options".

           2. Definitions. As used herein, the following definitions shall
apply:

                   (a) "Board" means the Board of Directors of the Company.

                   (b) "Code" means the Internal Revenue Code of 1986, as
amended.

                   (c) "Common Stock" means the Common Stock of the Company.

                   (d) "Company" means Adaptec, Inc., a Delaware corporation.

                   (e) "Continuous Status as a Director" means the absence of
any interruption or termination of service as a Director.

                   (f) "Director" means a member of the Board.

                   (g) "Employee" means any person, including officers and
Directors, employed by the Company or any Parent or Subsidiary of the Company.
The payment of a Director's fee by the Company shall not be sufficient in and of
itself to constitute "employment" by the Company.

                   (h) "Exchange Act" means the Securities Exchange Act of 1934,
as amended.

                   (i) "Fair Market Value" means, as of any date, the value of
Common Stock determined as follows:

                      (i) If the Common Stock is listed on any established stock
exchange or a national market system, including without limitation the National
Market System of the National Association of Securities Dealers, Inc. Automated
Quotation ("NASDAQ") System, the Fair Market Value of a Share of Common Stock
shall be the closing sales price for such stock (or the closing bid, if no sales
were reported, as quoted on such system or exchange (or the exchange with the
greatest volume of trading in Common Stock) on the last market trading day prior
to the day of


<PAGE>   2
determination) as reported in the Wall Street Journal or such other source as
the Board deems reliable;

                      (ii) If the Common Stock is quoted on the NASDAQ System
(but not on the National Market System thereof) or regularly quoted by a
recognized securities dealer but selling prices are not reported, the Fair
Market Value of a Share of Common Stock shall be the mean between the high and
low asked prices for the Common Stock on the last market trading day prior to
the date of determination, as reported in the Wall Street Journal or such other
source as the Board deems reliable, or;

                      (iii) In the absence of an established market for the
Common Stock, the Fair Market Value thereof shall be determined in good faith by
the Board.

                   (j) "Option" means a stock option granted pursuant to the
Plan.

                   (k) "Optioned Stock" means the Common Stock subject to an
Option.

                   (l) "Optionee" means an Outside Director who receives an
Option.

                   (m) "Outside Director" means a Director who is not an
Employee.

                   (n) "Parent" means a "parent corporation", whether now or
hereafter existing, as defined in Section 425(e) of the Internal Revenue Code of
1986.

                   (o) "Plan" means this 1990 Directors' Option Plan.

                   (p) "Share" means a share of the Common Stock, as adjusted in
accordance with Section 10 of the Plan.

                   (q) "Subsidiary" means a "subsidiary corporation", whether
now or hereafter existing, as defined in Section 424(f) of the Internal Revenue
Code of 1986.

           3. Stock Subject to the Plan. Subject to the provisions of Section 10
of the Plan, the maximum aggregate number of Shares which may be optioned and
sold under the Plan is 2,200,000 Shares (the "Pool") of Common Stock. The Shares
may be authorized, but unissued, or reacquired Common Stock.

                   If an Option should expire or become unexercisable for any
reason without having been exercised in full, the unpurchased Shares which were
subject thereto shall, unless the Plan shall have been terminated, become
available for future grant under the Plan.



                                      -2-
<PAGE>   3
           4. Administration of and Grants of Options under the Plan.

                   (a) Administrator. Except as otherwise required herein, the
Plan shall be administered by the Board.

                   (b) Procedure for Grants. All grants of Options hereunder
shall be automatic and non-discretionary and shall be made strictly in
accordance with the following provisions:

                      (i) No person shall have any discretion to select which
Outside Directors shall be granted Options or to determine the number of Shares
to be covered by Options granted to Outside Directors.

                      (ii) Each Outside Director shall be automatically granted
an Option to purchase 40,000 Shares upon the date (on or after the effective
date of this Plan) on which such person first becomes a Director, whether
through election by the stockholders of the Company or appointment by the Board
to fill a vacancy; provided, however, that no Option shall be issued under the
Plan or become exercisable until stockholder approval of the Plan has been
obtained in accordance with Section 16 hereof.

                      (iii) On March 31, 1997 and on each March 31 thereafter
during the term of this Plan, each Outside Director shall automatically receive
an Option to purchase 15,000 Shares.

                      (iv) The terms of each Option granted hereunder shall be
as follows:

                           (A) the term of the Option shall be ten (10) years.

                           (B) the Option shall be exercisable only while the
Outside Director remains a Director of the Company, except as set forth in
Section 8 hereof.

                           (C) the exercise price per Share shall be 100% of the
Fair Market Value per Share on the date of grant of the Option.

                           (D) if granted pursuant to Section 4(b)(ii), the
Option shall become exercisable in installments cumulatively as to twenty-five
percent (25%) of the Optioned Stock on the first anniversary of the date of
grant of the Option and as to six and one-quarter percent (6.25%) of the
remaining Optioned Stock for each full calendar quarter thereafter that the
Optionee remains a Director.

                           (E) if granted pursuant to Section 4(b)(iii) above,
the Option shall become exercisable in installments cumulatively as to
twenty-five percent (25%) of the Optioned Stock on the last day of each full
calendar quarter after the date of grant, provided that the Optionee remains a
Director as of such date.



                                      -3-
<PAGE>   4

                      (v) In the event that any Option granted under the Plan
would cause the number of Shares subject to outstanding Options plus the number
of Shares previously purchased upon exercise of Options to exceed the Pool, then
each such automatic grant shall be for that number of Shares determined by
dividing the total number of Shares remaining available for grant by the number
of Outside Directors on the automatic grant date. No further grants shall be
made until such time, if any, as additional Shares become available for grant
under the Plan through action of the stockholders to increase the number of
Shares which may be issued under the Plan or through cancellation or expiration
of Options previously granted hereunder.

                   (c) Powers of the Board. Subject to the provisions and
restrictions of the Plan, the Board shall have the authority, in its discretion:
(i) to determine, upon review of relevant information and in accordance with
Section 2(i) of the Plan, the Fair Market Value of the Common Stock; (ii) to
interpret the Plan; (iii) to prescribe, amend and rescind rules and regulations
relating to the Plan; (iv) to authorize any person to execute on behalf of the
Company any instrument required to effectuate the grant of an Option previously
granted hereunder; and (v) to make all other determinations deemed necessary or
advisable for the administration of the Plan.

                   (d) Effect of Board's Decision. All decisions, determinations
and interpretations of the Board shall be final.

                   (e) Suspension or Termination of Option. If the President of
the Company or his designee reasonably believes that an Optionee has committed
an act of misconduct, the President may suspend the Optionee's right to exercise
any Option pending a determination by the Board (excluding the Outside Director
accused of such misconduct). If the Board (excluding the Outside Director
accused of such misconduct) determines an Optionee has committed an act of
embezzlement, fraud, dishonesty, nonpayment of an obligation owed to the
Company, breach of fiduciary duty or deliberate disregard of the Company rules
resulting in loss, damage or injury to the Company, or if an Optionee makes an
unauthorized disclosure of any Company trade secret or confidential information,
engages in any conduct constituting unfair competition, induces any Company
customer to breach a contract with the Company or induces any principal for whom
the Company acts as agent to terminate such agency relationship, neither the
Optionee nor his estate shall be entitled to exercise any Option whatsoever. In
making such determination, the Board (excluding the Outside Director accused of
such misconduct) shall act fairly and shall give the Optionee an opportunity to
appear and present evidence on Optionee's behalf at a hearing before the Board
or a committee of the Board.

           5. Eligibility. Options may be granted only to Outside Directors. All
Options shall be automatically granted in accordance with the terms set forth in
Section 4(b) hereof. An Outside Director who has been granted an Option may, if
he is otherwise eligible, be granted an additional Option or Options in
accordance with such provisions.



                                      -4-
<PAGE>   5
                   The Plan shall not confer upon any Optionee any right with
respect to continuation of service as a Director or nomination to serve as a
Director, nor shall it interfere in any way with any rights which the Director
or the Company may have to terminate his directorship at any time.

           6. Term of Plan. The Plan shall become effective upon the earlier to
occur of its adoption by the Board or its approval by the stockholders of the
Company as described in Section 16 of the Plan. It shall continue in effect for
a term of ten (10) years unless sooner terminated under Section 11 of the Plan.

           7. Exercise Price and Consideration.

                   (a) Exercise Price. The per Share exercise price for Optioned
Stock shall be 100% of the Fair Market Value per Share on the date of grant of
the Option.

                   (b) Form of Consideration. The consideration to be paid for
the Shares to be issued upon exercise of an Option, including the method of
payment, shall be determined by the Board and may consist entirely of (i) cash,
(ii) check, (iii) promissory note, (iv) other shares which (x) in the case of
Shares acquired upon exercise of an Option either have been owned by the
Optionee for more than six (6) months on the date of surrender or were not
acquired, directly or indirectly, from the Company, and (y) have a Fair Market
Value on the date of surrender equal to the aggregate exercise price of the
Shares as to which said Option shall be exercised, (v) delivery of a properly
executed exercise notice together with irrevocable instructions to a broker to
promptly deliver to the Company the amount of sale or loan proceeds required to
pay the exercise price, (vi) by delivering an irrevocable subscription agreement
for the Shares which irrevocably obligates the Optionee to take and pay for the
Shares not more than twelve (12) months after the date of delivery of the
subscription agreement, (vii) any combination of the foregoing methods of
payment, or (viii) such other consideration and method of payment for the
issuance of Shares to the extent permitted under applicable law.

           8. Exercise of Option.

                   (a) Procedure for Exercise; Rights as a Stockholder. Any
Option granted hereunder shall be exercisable at such times as are set forth in
Section 4(b) hereof; provided, however, that no Options shall be exercisable
until stockholder approval of the Plan in accordance with Section 16 hereof has
been obtained.

                   An Option may not be exercised for a fraction of a Share.

                   An Option shall be deemed to be exercised when written notice
of such exercise has been given to the Company in accordance with the terms of
the Option by the person entitled to exercise the Option and full payment for
the Shares with respect to which the Option is exercised has been received by
the Company. Full payment may consist of any consideration and method of payment
allowable under Section 7(b) of the Plan. Until the issuance (as evidenced by
the appropriate entry on the books of the Company or of a duly authorized
transfer agent of the



                                      -5-
<PAGE>   6
Company) of the stock certificate evidencing such Shares, no right to vote or
receive dividends or any other rights as a stockholder shall exist with respect
to the Optioned Stock, notwithstanding the exercise of the Option. A share
certificate for the number of Shares so acquired shall be issued to the Optionee
as soon as practicable after exercise of the Option. No adjustment will be made
for a dividend or other right for which the record date is prior to the date the
stock certificate is issued, except as provided in Section 10 of the Plan.

                   Exercise of an Option in any manner shall result in a
decrease in the number of Shares which thereafter may be available, both for
purposes of the Plan and for sale under the Option, by the number of Shares as
to which the Option is exercised.

                   (b) Termination of Status as a Director. If an Outside
Director ceases to serve as a Director, he may, but only within three (3) months
after the date he ceases to be a Director of the Company, exercise his Option to
the extent that he was entitled to exercise it at the date of such termination.
Notwithstanding the foregoing, in no event may the Option be exercised after its
term has expired. To the extent that he was not entitled to exercise an Option
at the date of such termination, or if he does not exercise such Option (which
he was entitled to exercise) within the time specified herein, the Option shall
terminate.

                   (c) Disability of Optionee. Notwithstanding the provisions of
Section 8(b) above, in the event an Optionee is unable to continue his service
as a Director as a result of his total and permanent disability (as defined in
Section 22(e)(3) of the Code), he may, but only within six (6) months from the
date of termination, exercise his Option to the extent he was entitled to
exercise it at the date of such termination. Notwithstanding the foregoing, in
no event may the Option be exercised after its term has expired. To the extent
that he was not entitled to exercise the Option at the date of termination, or
if he does not exercise such Option (which he was entitled to exercise) within
the time specified herein, the Option shall terminate.

                   (d) Death of Optionee. In the event of the death of an
Optionee, the Option may be exercised, at any time within six (6) months
following the date of death, by the Optionee's estate or by a person who
acquired the right to exercise the Option by bequest or inheritance, but only to
the extent of the right to exercise that had accrued at the date of death.
Notwithstanding the foregoing, in no event may the option be exercised after its
term has expired.

           9. Non-Transferability of Options. Unless determined otherwise by the
Board, the Option may not be sold, pledged, assigned, hypothecated, transferred,
or disposed of in any manner other than by will or by the laws of descent or
distribution and may be exercised, during the lifetime of the Optionee, only by
the Optionee. If the Administrator makes an Option or Right transferable, such
Option or Right shall contain such additional terms and conditions as the
Administrator deems appropriate.

           10. Adjustments Upon Changes in Capitalization or Merger.



                                      -6-
<PAGE>   7
                   (a) Subject to any required action by the stockholders of the
Company, the number of Shares covered by each outstanding Option, and the number
of Shares which have been authorized for issuance under the Plan but as to which
no Options have yet been granted or which have been returned to the Plan upon
cancellation or expiration of an Option, as well as the price per Share covered
by each such outstanding Option, shall be proportionately adjusted for any
increase or decrease in the number of issued Shares resulting from a stock
split, reverse stock split, stock dividend, combination or reclassification of
the Common Stock, or any other increase or decrease in the aggregate number of
issued Shares effected without receipt of consideration by the Company;
provided, however, that conversion of any convertible securities of the Company
shall not be deemed to have been "effected without receipt of consideration."
Such adjustment shall be made by the Board, whose determination in that respect
shall be final, binding and conclusive. Except as expressly provided herein, no
issuance by the Company of Shares of stock of any class, or securities
convertible into Shares of stock of any class, shall affect, and no adjustment
by reason thereof shall be made with respect to, the number or price of Shares
subject to an Option.

                      In the event of the proposed dissolution or liquidation of
the Company, all outstanding Options will terminate immediately prior to the
consummation of such proposed action, unless otherwise provided by the Board.
The Board may, in the exercise of its sole discretion in such instances, declare
that any Option shall terminate as of a date fixed by the Board and give each
Optionee the right to exercise his Option as to all or any part of the Optioned
Stock, including Shares as to which the Option would not otherwise be
exercisable.

                   (b) In the event of a "Change in Control" of the Company, as
defined in paragraph (c) below, any Options outstanding upon the date of such
Change in Control that are not yet exercisable and vested on such date shall
become one hundred percent (100%) exercisable and vested.

                   (c) Definition of "Change in Control". For purposes of this
Section 10, a "Change in Control" means the occurrence of any of the following:

                      (i) When any "person," as such term is used in Sections
           13(d) and 14(d) of the Securities Exchange Act (other than the
           Company, a Subsidiary or a Company employee benefit plan, including
           any trustee of such plan acting as trustee) is or becomes the
           "beneficial owner" (as defined in Rule 13d-3 under the Exchange Act),
           directly or indirectly, of securities of the Company representing
           fifty percent (50%) or more of the combined voting power of the
           Company's then outstanding securities; or

                      (ii) A change in the composition of the Board occurring
           within a two-year period, as a result of which fewer than a majority
           of the directors are Incumbent Directors. "Incumbent Directors" shall
           mean directors who either (A) are directors of the Company as of the
           date hereof, or (B) are elected, or nominated for election, to the
           Board with the affirmative votes of at least a majority of the
           Incumbent Directors at the time of such election or nomination (but
           shall not include an individual whose election or nomination is in




                                      -7-
<PAGE>   8

           connection with an actual or threatened proxy contest relating to the
           election of directors to the Company);

                      (iii) The consummation of a merger or consolidation of the
           Company with any other corporation, other than a merger or
           consolidation which would result in the voting securities of the
           Company outstanding immediately prior thereto continuing to represent
           (either by remaining outstanding or by being converted into voting
           securities of the surviving entity) at least fifty percent (50%) of
           the total voting power represented by the voting securities of the
           Company or such surviving entity outstanding immediately after such
           merger or consolidation; or

                      (iv) The consummation of the sale or disposition by the
           Company of all or substantially all the Company's assets.

                   (d) Golden Parachute Excise Tax Vesting Acceleration
Limitation. Notwithstanding any other provision of this Plan, in the event that
the vesting acceleration provided for in this Plan or amounts or benefits
otherwise payable to an Optionee (i) constitute "parachute payments" within the
meaning of Section 280G of the Code, and (ii) but for this Section 10(d), would
be subject to the excise tax imposed by Section 4999 of the Code (the "Excise
Tax"), then the Optionee's accelerated vesting hereunder shall be either

                      (i)  made in full, or

                      (ii) made as to such lesser extent as would result in no
           portion of such acceleration, amounts or benefits being subject to
           the Excise Tax,

whichever of the foregoing amounts, taking into account the applicable federal,
state and local income taxes and the Excise Tax, results in the receipt by the
Optionee on an after-tax basis, of the greatest amount of severance benefits,
notwithstanding that all or some portion of such severance benefits may be
taxable under Section 4999 of the Code. Unless the Company and the Optionee
otherwise agree in writing, any determination required under this Section 10(d)
shall be made in writing in good faith by the accounting firm serving as the
Company's independent public accountants immediately prior to the Change of
Control (the "Accountants"). In the event of a reduction in benefits hereunder,
the Optionee shall be given the choice of which benefits to reduce. For purposes
of making the calculations required by this Section 10(d), the Accountants may
make reasonable assumptions and approximations concerning applicable taxes and
may rely on reasonable, good faith interpretations concerning the application of
Sections 280G and 4999 of the Code. The Company and the Optionee shall furnish
to the Accountants such information and documents as the Accountants may
reasonably request in order to make a determination under this Section. The
Company shall bear all costs the Accountants may reasonably incur in connection
with any calculations contemplated by this Section 10(d).



                                      -8-
<PAGE>   9

           11. Amendment and Termination of the Plan.

                   (a) Amendment and Termination. The Board may at any time
amend, alter, suspend, or discontinue the Plan, but no amendment, alteration,
suspension, or discontinuation shall be made which would impair the rights of
any Optionee under any grant theretofore made, without his or her consent. In
addition, to the extent necessary and desirable to comply with any other
applicable law or regulation, the Company shall obtain shareholder approval of
any Plan amendment in such a manner and to such a degree as required.

                   (b) Effect of Amendment or Termination. Any such amendment or
termination of the Plan shall not affect Options already granted and such
Options shall remain in full force and effect as if this Plan had not been
amended or terminated.

           12. Time of Granting Options. The date of grant of an Option shall,
for all purposes, be the date determined in accordance with Section 4(b) hereof.
Notice of the determination shall be given to each Outside Director to whom an
Option is so granted within a reasonable time after the date of such grant.

           13. Conditions Upon Issuance of Shares. Shares shall not be issued
pursuant to the exercise of an Option unless the exercise of such Option and the
issuance and delivery of such Shares pursuant thereto shall comply with all
relevant provisions of law, including, without limitation, the Securities Act of
1933, as amended, the Exchange Act, the rules and regulations promulgated
thereunder, state securities laws, and the requirements of any stock exchange
upon which the Shares may then be listed, and shall be further subject to the
approval of counsel for the Company with respect to such compliance.

                   As a condition to the exercise of an Option, the Company may
require the person exercising such Option to represent and warrant at the time
of any such exercise that the Shares are being purchased only for investment and
without any present intention to sell or distribute such Shares, if, in the
opinion of counsel for the Company, such a representation is required by any of
the aforementioned relevant provisions of law.

                   Inability of the Company to obtain authority from any
regulatory body having jurisdiction, which authority is deemed by the Company's
counsel to be necessary to the lawful issuance and sale of any Shares hereunder,
shall relieve the Company of any liability in respect of the failure to issue or
sell such Shares as to which such requisite authority shall not have been
obtained.

           14. Reservation of Shares. The Company, during the term of this Plan,
will at all times reserve and keep available such number of Shares as shall be
sufficient to satisfy the requirements of the Plan.



                                      -9-
<PAGE>   10

           15. Option Agreement. Options shall be evidenced by written option
agreements in such form as the Board shall approve.

           16. Stockholder Approval. Continuance of the Plan shall be subject to
approval by the stockholders of the Company at or prior to the first annual
meeting of stockholders held subsequent to the granting of an Option hereunder.
Such stockholder approval shall be obtained in the degree and manner required
under applicable state and federal law.


                                      -10-
<PAGE>   11
                                  ADAPTEC, INC.

                           DIRECTOR'S OPTION AGREEMENT

                                (Initial Option)


           Adaptec, Inc., a Delaware corporation (the "Company"), has granted to
____________________________________________ (the "Optionee"), an option to
purchase a total of 40,000 shares of the Company's Common Stock (the "Optioned
Stock"), at the price determined as provided herein, and in all respects subject
to the terms, definitions and provisions of the 1990 Directors' Option Plan (the
"Plan") adopted by the Company which is incorporated herein by reference. The
terms defined in the Plan shall have the same defined meanings herein.

1.         Nature of the Option. This Option is a nonstatutory option and is not
           intended to qualify for any special tax benefits to the Optionee.

2.         Exercise Price. The exercise price is $_____________ for each share
           of Common Stock, which is 100% of the fair market value of the Common
           Stock as determined on the date of grant of this Option.

3.         Exercise of Option. This Option shall be exercisable during its term
           in accordance with the provisions of Section 8 of the Plan as
           follows:

           (a)        Right to Exercise.

                     (i)       This Option shall become exercisable cumulatively
                               as to twenty-five percent (25%) of the Optioned
                               Stock on the first anniversary of the date of the
                               grant and as to six and one-quarter percent
                               (6.25%) of the remaining Optioned Stock for each
                               full quarter thereafter that the Optionee remains
                               a Director; provided, however, that in no event
                               shall this Option be exercisable until
                               stockholder approval of the Plan has been
                               obtained in accordance with Section 16 thereof.

                     (ii)      This Option may not be exercised for a fraction
                               of a share.

                     (iii)     In the event of Optionee's death, disability or
                               other termination of service as a Director, the
                               exercisability of the Option is governed by
                               Sections 6, 7 and 8 of this Agreement.

           (b)        Method of Exercise. This Option shall be exercisable by
                      written notice which shall state the election to exercise
                      the Option, the number of Shares in respect of which the
                      Option is being exercised, and such other representations
                      and agreements



                                      -1-
<PAGE>   12

                      as to the holder's investment intent with respect to such
                      Shares of Common Stock as may be required by the Company
                      pursuant to the provisions of the Plan. Such written
                      notice shall be signed by the Optionee and shall be
                      delivered in person or by certified mail to the Secretary
                      of the Company. The written notice shall be accompanied by
                      payment of the exercise price.

4.             Method of Payment. Payment of the exercise price shall be by any
           of the following, or a combination thereof, at the election of the
           Optionee:

           (a)        cash;

           (b)        check; or

           (c)        surrender of other Shares of Common Stock of the Company
                      which (A) either have been owned by the Optionee for more
                      than six (6) months on the date of surrender or were not
                      acquired, directly or indirectly, from the Company, and
                      (B) have a fair market value on the date of surrender
                      equal to the exercise price of the Shares as to which the
                      Option is being exercised.

5.             Restrictions on Exercise. This Option may not be exercised if the
           issuance of such Shares upon such exercise or the method of payment
           of consideration for such shares would constitute a violation of any
           applicable federal or state securities or other law or regulations,
           or if such issuance would not comply with the requirements of any
           stock exchange upon which the Shares may then be listed. As a
           condition to the exercise of this Option, the Company may require
           Optionee to make any representation and warranty to the Company as
           may be required by any applicable law or regulation.

6.             Termination of Status as a Director. If Optionee ceases to serve
           as a Director, he may, but only within three (3) months after the
           date he ceases to be a Director of the Company, exercise this Option
           to the extent that he was entitled to exercise it at the date of such
           termination. Notwithstanding the foregoing, in no event may the
           Option be exercised after the ten (10) year term has expired. To the
           extent that he was not entitled to exercise this Option at the date
           of such termination, or if he does not exercise this Option within
           the time specified herein, the Option shall terminate.

7.             Disability of Optionee. Notwithstanding the provisions of Section
           6 above, if Optionee is unable to continue his service as a Director
           as a result of his total and permanent disability (as defined in
           Section 22(e)(3) of the Internal Revenue Code), he may, but only
           within six (6) months from the date of termination, exercise this
           Option to the extent he was entitled to exercise it at the date of
           such termination. To the extent that he was not entitled to exercise
           this Option at the date of termination, or if he does not exercise
           this Option within the time specified herein, the Option shall
           terminate.



                                      -2-
<PAGE>   13
8.             Death of Optionee. In the event of the death of Optionee, the
           Option may be exercised, at any time within six (6) months following
           the date of death, by Optionee's estate or by a person who acquired
           the right to exercise the Option by bequest or inheritance, but only
           to the extent of the right to exercise that had accrued at the date
           of death.

9.             Non-Transferability of Option. This Option may not be transferred
           in any manner otherwise than by will or by the laws of descent or
           distribution and may be exercised during the lifetime of Optionee
           only by him. The terms of this Option shall be binding upon the
           executors, administrators, heirs, successors and assigns of the
           Optionee.

10.            Term of Option. This Option may not be exercised more than ten
           (10) years from the date of grant of this Option, and may be
           exercised during such term only in accordance with the Plan and the
           terms of this Option.

11.            Taxation Upon Exercise of Option. Optionee understands that, upon
           exercise of this Option, he will recognize income for tax purposes in
           an amount equal to the excess of the then fair market value of the
           Shares purchased over the exercise price paid for such Shares. (Since
           the Optionee is subject to Section 16(b) of the Securities Exchange
           Act of 1934, as amended, the measurement and timing of such income
           may be deferred, and the Optionee is advised to contact a tax advisor
           concerning the desirability of filing an 83(b) election in connection
           with the exercise of the Option.) Upon a resale of such Shares by the
           Optionee, any difference between the sale price and the fair market
           value of the Shares on the date of exercise of the Option will be
           treated as capital gain or loss.

DATE OF GRANT:  _________________



                                       ADAPTEC, INC.,
                                       a Delaware corporation



                                       By:______________________________________
                                          President



                                      -3-
<PAGE>   14
           Optionee acknowledges receipt of a copy of the Plan, a copy of which
is annexed hereto, and represents that he is familiar with the terms and
provisions thereof, and hereby accepts this Option subject to all of the terms
and provisions thereof. Optionee hereby agrees to accept as binding, conclusive
and final all decisions or interpretations of the Board upon any questions
arising under the Plan.


           Dated: _________________

                                         _______________________________________
                                         Optionee



                                      -4-
<PAGE>   15
                                  ADAPTEC, INC.

                           DIRECTOR'S OPTION AGREEMENT

                                 (Annual Option)



           Adaptec, Inc., a Delaware corporation (the "Company"), has granted to
_________________________________________ (the "Optionee"), an option to
purchase a total of 15,000 shares of the Company's Common Stock (the "Optioned
Stock"), at the price determined as provided herein, and in all respects subject
to the terms, definitions and provisions of the 1990 Directors' Option Plan (the
"Plan") adopted by the Company which is incorporated herein by reference. The
terms defined in the Plan shall have the same defined meanings herein.

1.             Nature of the Option. This Option is a nonstatutory option and is
           not intended to qualify for any special tax benefits to the Optionee.

2.             Exercise Price. The exercise price is $_____________ for each
           share of Common Stock, which is 100% of the fair market value of the
           Common Stock as determined on the date of grant of this Option.

3.             Exercise of Option.  This Option shall be exercisable during its
           term in accordance with the provisions of Section 8 of the Plan as
           follows:

           (a)        Right to Exercise.

                      (i)        This Option shall become exercisable
                                 cumulatively as to twenty-five percent (25%) of
                                 the Optioned Stock for each full quarter after
                                 the date of grant that the Optionee remains a
                                 Director; provided, however, that in no event
                                 shall this Option be exercisable until
                                 stockholder approval of the Plan has been
                                 obtained in accordance with Section 16 thereof.

                      (ii)       This Option may not be exercised for a fraction
                                 of a share.

                      (iii)      In the event of Optionee's death, disability or
                                 other termination of service as a Director, the
                                 exercisability of the Option is governed by
                                 Sections 6, 7 and 8 of this Agreement.



                                      -1-
<PAGE>   16
           (b)       Method of Exercise. This Option shall be exercisable by
                     written notice which shall state the election to exercise
                     the Option, the number of Shares in respect of which the
                     Option is being exercised, and such other representations
                     and agreements as to the holder's investment intent with
                     respect to such Shares of Common Stock as may be required
                     by the Company pursuant to the provisions of the Plan. Such
                     written notice shall be signed by the Optionee and shall be
                     delivered in person or by certified mail to the Secretary
                     of the Company. The written notice shall be accompanied by
                     payment of the exercise price.

4.             Method of Payment. Payment of the exercise price shall be by any
           of the following, or a combination thereof, at the election of the
           Optionee:

           (a)        cash;

           (b)        check; or

           (c)        surrender of other Shares of Common Stock of the Company
                      which (A) either have been owned by the Optionee for more
                      than six (6) months on the date of surrender or were not
                      acquired, directly or indirectly, from the Company, and
                      (B) have a fair market value on the date of surrender
                      equal to the exercise price of the Shares as to which the
                      Option is being exercised.

5.             Restrictions on Exercise. This Option may not be exercised if the
           issuance of such Shares upon such exercise or the method of payment
           of consideration for such shares would constitute a violation of any
           applicable federal or state securities or other law or regulations,
           or if such issuance would not comply with the requirements of any
           stock exchange upon which the Shares may then be listed. As a
           condition to the exercise of this Option, the Company may require
           Optionee to make any representation and warranty to the Company as
           may be required by any applicable law or regulation.

6.             Termination of Status as a Director. If Optionee ceases to serve
           as a Director, he may, but only within three (3) months after the
           date he ceases to be a Director of the Company, exercise this Option
           to the extent that he was entitled to exercise it at the date of such
           termination. Notwithstanding the foregoing, in no event may the
           Option be exercised after its ten (10) year term has expired. To the
           extent that he was not entitled to exercise this Option at the date
           of such termination, or if he does not exercise this Option within
           the time specified herein, the Option shall terminate.



                                      -2-

<PAGE>   17

7.             Disability of Optionee. Notwithstanding the provisions of Section
           6 above, if Optionee is unable to continue his service as a Director
           as a result of his total and permanent disability (as defined in
           Section 22(e)(3) of the Internal Revenue Code), he may, but only
           within six (6) months from the date of termination, exercise this
           Option to the extent he was entitled to exercise it at the date of
           such termination. To the extent that he was not entitled to exercise
           this Option at the date of termination, or if he does not exercise
           this Option within the time specified herein, the Option shall
           terminate.

8.             Death of Optionee. In the event of the death of Optionee, the
           Option may be exercised, at any time within six (6) months following
           the date of death, by Optionee's estate or by a person who acquired
           the right to exercise the Option by bequest or inheritance, but only
           to the extent of the right to exercise that had accrued at the date
           of death.

9.             Non-Transferability of Option. This Option may not be transferred
           in any manner otherwise than by will or by the laws of descent or
           distribution and may be exercised during the lifetime of Optionee
           only by him. The terms of this Option shall be binding upon the
           executors, administrators, heirs, successors and assigns of the
           Optionee.

10.            Term of Option. This Option may not be exercised more than ten
           (10) years from the date of grant of this Option, and may be
           exercised during such term only in accordance with the Plan and the
           terms of this Option.

11.            Taxation Upon Exercise of Option.  Optionee understands that,
           upon exercise of this Option, he will recognize income for tax
           purposes in an amount equal to the excess of the then fair market
           value of the Shares purchased over the exercise price paid for such
           Shares. (Since the Optionee is subject to Section 16(b) of the
           Securities Exchange Act of 1934, as amended, the measurement and
           timing of such income may be deferred, and the Optionee is advised to
           contact a tax advisor concerning the desirability of filing an 83(b)
           election in connection with the exercise of the Option.) Upon a
           resale of such Shares by the Optionee, any difference between the
           sale price and the fair market value of the Shares on the date of
           exercise of the Option will be treated as capital gain or loss.



DATE OF GRANT:  ______________



                                       ADAPTEC, INC.,
                                       a Delaware corporation



                                       By:_____________________________________



                                      -3-

<PAGE>   18

                                          President



                                      -4-
<PAGE>   19
           Optionee acknowledges receipt of a copy of the Plan, a copy of which
is annexed hereto, and represents that he is familiar with the terms and
provisions thereof, and hereby accepts this Option subject to all of the terms
and provisions thereof. Optionee hereby agrees to accept as binding, conclusive
and final all decisions or interpretations of the Board upon any questions
arising under the Plan.


           Dated: _________________


                                                      __________________________
                                                      Optionee



                                      -5-

<PAGE>   1
                                                                   EXHIBIT 10.16

                                   AMENDMENT
                                       TO
                            OPTION AGREEMENTS I & II


                                    BETWEEN


                                 ADAPTEC, INC.


                                      AND


                  TAIWAN SEMICONDUCTOR MANUFACTURING CO., LTD.


                                JANUARY 1, 1999


* Portions of this document have been omitted and filed separately with the
Securities and Exchange Commission pursuant to a request for confidential
treatment
<PAGE>   2

                                   AMENDMENT
                                   ---------

     THIS AMENDMENT is made and becomes effective as of January 1, 1999 (the
"Effective Date") by Taiwan Semiconductor Manufacturing Co., Ltd. ("TSMC", a
company organized under the laws of the Republic of China with its registered
address at No. 121, Park Ave. 3, Science Based Industrial Park, Hsinchu,
Taiwan, and Adaptec, Manufacturing (s) Pts. Ltd., a company organized under the
laws of Singapore with its registered address at 6 Battery Road, 532-00,
Singapore, 049909. ("Customer").

RECITALS

     WHEREAS, TSMC currently supplies Customers with wafers and Customer
wishes to maintain TSMC's guarantee to continue to supply the wafers;

     WHEREAS, Parties wish to amend the terms of the Option Agreements I and II
as set forth herein;

AGREEMENT

     NOW, THEREFORE, in consideration of the mutual covenants and conditions
contained herein, the parties agree as follows:

1. DEFINITIONS

     (a) All definitions under Option Agreements I and II remain the same
         excepted where stated herein.

     (b) "Wafer Equivalent" used in this Amendment shall mean the number of
         six-inch wafers based on the equivalency factor for 1998 Bass Capacity.
         For details of the equivalency factor, please refer to Exhibit A, which
         will be amended from time to time. Any and all capacity commitments
         referred to in this Amendment shall be measured in wafer Equivalent.

2. VOLUME COMMITMENT

     All terms and conditions pertaining to this section remain the same as set
     forth in Option Agreements I and II except where stated herein. The new
     volume commitment is listed in Exhibit B.

<PAGE>   3


3.  WAFER PRICE

    All terms and conditions pertaining to this section remain the same as set
    forth in Option Agreements I and II except where stated herein. TSMC agrees
    to refund to the Customer in the amount of [*] for the overpayment in the
    calendar year 1998 based on the Option Agreements I and II for the calendar
    year 1998. TSMC shall distribute the refund in four (4) equal installments
    to the Customer on January 31, 1999, April 30, 1999, July 31, 1999, and
    October 31, 1999 respectively.

4.  OTHER PURCHASE TERMS AND CONDITIONS

    All terms and conditions pertaining to this section remain the same as set
    forth in Option Agreements I and II and Amendment No. 2 to the Foundry
    Agreement effective as of 21st April, 1997.

5.  OBLIGATION TO PAY OPTION FEE FOR OPTION CAPACITY

    All terms and conditions pertaining to this section remain the same as set
    forth in Option Agreement II except the amount for the Option Fee shall be
    [*].

6.  FAILURE TO PURCHASE THE OPTION CAPACITY; FIRST RIGHT OF REFUSAL

    All terms and conditions pertaining to this section remain the same as set
    forth in Option Agreements I and II.

7.  TERM AND TERMINATION

    All terms and conditions pertaining to this section remain the same as set
    forth in Option Agreements I and II except that the expiration of this
    Amendment shall be December 31, 2002.

8.  BOARD APPROVAL

    Customer shall obtain the approval by its board of director of this
    Amendment, and submit to TSMC, at the time of executing this Amendment, an
    authentic copy of its board resolution authorizing the representative
    designated below to execute this Amendment.


* Confidential information has been omitted and filed separately with the
  Securities and Exchange Commission pursuant to a request for confidential
  treatment.
<PAGE>   4
9.   LIMITATION OF LIABILITY

     All terms and conditions pertaining to this section remain the same as set
     forth in Option Agreements I and II.

10.  NOTICE

     All terms and conditions pertaining to this section remain the same as set
     forth in Option Agreements I and II.

11.  ENTIRE AGREEMENT

     This Amendment together with the Option Agreements I and II, including
Exhibits A-D attached hereto, constitute the entire Agreement between the
parties with respect to the subject matter hereof, and supersedes and replaces
all prior or contemporaneous understandings, agreements, dealings and
negotiations, oral or written, regarding the subject matter hereof. No
modification, alteration or amendment of this Agreement shall be effective
unless in writing and signed by both parties. No waiver of any breach or
failure by either party to enforce any provision of this Agreement shall be
deemed a waiver of any other or subsequent breach, or a waiver of future
enforcement of that or any other provision.

12. GOVERNING LAW

     This Agreement will be governed by and interpreted in accordance with the
laws of the State of California.

13. ARBITRATION

     All terms and conditions pertaining to this section remain the same as
set forth in Option Agreements I and II.

14. ASSIGNMENT

     All terms and conditions pertaining to this section remain the same as set
forth in Option Agreements I and II.


<PAGE>   5
15.  CONFIDENTIALITY

     All terms and conditions pertaining to this section remain the same as set
     forth in Option Agreement I and II.

16.  FORCE MAJEURE

     All terms and conditions pertaining to this section remain the same as set
     forth in Option Agreements I and II.

     IN WITNESS WHEREOF, the parties, have executed this Agreement as of the
     date first stated above.

TAIWAN SEMICONDUCTOR                      ADAPTEC MANUFACTURING(S)
MANUFACTURING CO., LTD.                   Ptd. Ltd.

By:  [Signature illegible]                By: /s/ Sam Kazarian
   ---------------------------------         --------------------------------
Name: [Signature illegible]                   Sam Kazarian
     -------------------------------         --------------------------------
Title: Sr. V.P. of TSM Ltd.                   Director and Attorney-In-Fact
      ------------------------------         --------------------------------
<PAGE>   6
                                   EXHIBIT A
                             CAPACITY FACTOR TABLE

<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------
                                     MASKING
                                    LAYERS(A)
                                   (W/O ESD OR      W-PLUG       COMPLEXITY     CAPACITY
GENERIC TECHNOLOGY                  POLYLMIDE)     LAYERS(B)      INDEX(C)      FACTOR(D)
- -----------------------------------------------------------------------------------------
<S>                                <C>             <C>           <C>            <C>
1.5um SPDM (BICMOS)                     *                             *             *
1.2um SPDM (Logic)                      *                             *             *
1.0um SPDM (Logic)                      *                             *             *
1.0um DPDM (BICMOS)                     *                             *             *
0.8um SPDM (Logic)                      *                             *             *
0.8um DPDM (MixMode)                    *                             *             *
0.8um SPTM (Logic Salicide)             *                             *             *
0.8um DPDM (BICMOS)                     *                             *             *
0.6um SPDM (Logic)                      *              *              *             *
0.6um SPTM (Logic)                      *              *              *             *
0.6um DPDM (Mix Mode)                   *              *              *             *
0.6um DPDM (SRAM)                       *                             *             *
0.6um TPSM (DRAM)                       *              *              *             *
0.6um QPDM (DRAM)                       *              *              *             *
0.5um SPDM (Logic)                      *              *              *             *
0.5um SPTM (Logic SACVD)                *              *              *             *
0.5um SPTM (Logic-CMP)                  *              *              *             *
0.5um DPDM (SRAM)                       *              *              *             *
0.5um QPDM (DRAM)                       *              *              *             *
0.35um SPTM (Logic-CMP)                 *              *              *             *
- -----------------------------------------------------------------------------------------
</TABLE>

Remarks:  (1) Masking Layer of w/f ESD (or Polylmide) = Masking Layer of w/o ESD
              (or Polylmide) + 1
          (2) Masking Layer of Mixed-Mode(DP) = Masking Layer of Logic(EP) + 1
          (3) Completely Index (C) = (A) + (B)/2
          (4) Capacity Factor (D) = (C)/13, normalized to 0.8um SPDM as 1

Date of issue: 6/9/95

NOTE: This table shall be amended from time to time to reflect the update of
the technology.


* Confidential information has been omitted and filed separately with the
  Securities and Exchange Commission pursuant to a request for confidential
  treatment.
<PAGE>   7
                                                                       EXHIBIT B

                        CUSTOMER/TSMC COMMITTED CAPACITY

<TABLE>
<CAPTION>
                          UNIT: K 6" WAVER EQUIVALENT
                          ---------------------------

                                   1999      2000      2001      2002
                                   ----      ----      ----      ----
<S>                                <C>       <C>       <C>       <C>

Base Capacity
  (For Options)                     [*]       [*]       [*]        [*]

X% of Base Capacity                 [*]       [*]       [*]        [*]

Option                              [*]       [*]       [*]        [*]

TSMC Committed Capacity
  (Base Capacity +
  Option Capacity)                  [*]       [*]       [*]        [*]

Customer Committed Capacity
  (X% Base Capacity +
  Option Capacity)                  [*]       [*]       [*]        [*]
</TABLE>

Option Capacity [*] wafers x [*] per wafer = [*]

Remaining from Deposits for Options I and II: US [*]


* Confidential information has been omitted and filed separately with the
  Securities and Exchange Commission pursuant to a request for confidential
  treatment.

<PAGE>   8
                                                                       EXHIBIT C

                            INTENTIONALLY LEFT BLANK

<PAGE>   9
                                                                       EXHIBIT D

                                   OPTION FEE

<TABLE>
<CAPTION>
                    Option Capacity
                     (Unit: Wafer            Option Fee
Year                  Equivalent)            (Unit: US$)         Due Date
- ----                ---------------          -----------         --------
<S>                 <C>                      <C>                 <C>
1999                      [*]                  $ [*]               Paid

2000                      [*]                  $ [*]               Paid

2001                      [*]                  $ [*]               Paid

2002                      [*]                  $ [*]               Paid
</TABLE>


[*] Confidential information has been omitted and filed separately with the
    Securities and Exchange Commission pursuant to a request for confidential
    treatment.

<PAGE>   1
                                                                   EXHIBIT 10.17

                           MODIFICATION TO AMENDMENT
                          TO OPTION AGREEMENTS I & II

     THIS MODIFICATION TO AMENDMENT is made and becomes effective as of March
5, 1999 (the "Effective Date") by Taiwan Semiconductor Manufacturing Co., Ltd.
("TSMC"), a company organized under the laws of the Republic of China with its
registered address at No. 121, Park Ave. 3, Science Based Industrial Park,
Hsinchu, Taiwan and Adaptec Manufacturing (S) Ptd. Ltd., a company organized
under the laws of Singapore, with it's registered address at Six Battery Road,
532-00, Singapore, 049909 ("Customer").

RECITALS

     WHEREAS, TSMC currently supplies Customer with wafers and Customer
wishes to maintain TSMC's guarantee to continue to supply the wafers;

     WHEREAS, Parties wish to modify the terms of the Amendment to Option
Agreements I and II as set forth herein;

AGREEMENT

     NOW, THEREFORE, in consideration of the mutual covenants and conditions
contained herein, the parties agree as follows:

Parties agree to replace the definition of "Wafer Equivalent" under Section
1(b) of the Amendment to the following: "Wafer Equivalent" used in this
Amendment shall mean the number of six-inch physical wafers (with no reference
to the equivalency factor in Exhibit A) for 1998 Base Capacity. For the
purposes of this Amendment, each eight-inch physical wafer is equal to one
point seven eight (1.78) six-inch physical wafer.

IN WITNESS WHEREOF, the parties, have executed this Agreement as of the date
first stated above.

TAIWAN SEMICONDUCTOR                      ADAPTEC MANUFACTURING(S)
MANUFACTURING CO., LTD.                   Ptd. Ltd.

By: /s/ Magnus Ryde for Ron Norris        By: /s/ Sam Kazarian
   ----------------------------------        --------------------------------
        Magnus Ryde for Ron Norris                Sam Kazarian
        Sr. Vice President, Worldwide             Vice President, Operations
        Sales and Marketing

<PAGE>   1
                                                                    EXHIBIT 21.1
SUBSIDIARIES OF REGISTRANT

Subsidiaries:

Adaptec Mfg. (S) Pte. Ltd.
Block 1003
Bukit Merah Central #07-09
Singapore 159836
(011-65) 278-7300

Adaptec GmbH
Munchner Strasse 19
85540 Haar Germany
(011-49) 89-456-4060

Adaptec Europe SA
Dreve Richelle 161, BP8
Building M
Waterloo Office Park
B-1410 Waterloo
Belgium
(011-32) 2-352-3411

Adaptec Japan Ltd.
Harmony Tower, 3F
3-32, Honcho 1-chome
Nakano-ku, Tokyo 164
Japan
(011-81) 35-365-6700

<TABLE> <S> <C>

<ARTICLE> 5
<MULTIPLIER> 1,000

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          MAR-31-1999
<PERIOD-START>                             APR-01-1998
<PERIOD-END>                               MAR-31-1999
<CASH>                                         317,580
<SECURITIES>                                   426,332
<RECEIVABLES>                                   69,053
<ALLOWANCES>                                     1,895
<INVENTORY>                                     50,838
<CURRENT-ASSETS>                             1,010,017
<PP&E>                                         223,678
<DEPRECIATION>                                  96,944
<TOTAL-ASSETS>                               1,173,068
<CURRENT-LIABILITIES>                          152,366
<BONDS>                                        230,000
                                0
                                          0
<COMMON>                                           106
<OTHER-SE>                                     790,596
<TOTAL-LIABILITY-AND-EQUITY>                 1,173,068
<SALES>                                        692,441
<TOTAL-REVENUES>                               692,441
<CGS>                                          284,503
<TOTAL-COSTS>                                  284,503
<OTHER-EXPENSES>                               441,428
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                              12,103
<INCOME-PRETAX>                                 20,942
<INCOME-TAX>                                    34,235
<INCOME-CONTINUING>                           (13,293)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                  (13,293)
<EPS-BASIC>                                     (0.12)
<EPS-DILUTED>                                   (0.12)


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 5
<MULTIPLIER> 1,000

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          MAR-31-1998
<PERIOD-START>                             APR-01-1997
<PERIOD-END>                               MAR-31-1998
<CASH>                                         227,183
<SECURITIES>                                   470,199
<RECEIVABLES>                                  140,661
<ALLOWANCES>                                     4,185
<INVENTORY>                                     71,297
<CURRENT-ASSETS>                               991,094
<PP&E>                                         278,231
<DEPRECIATION>                                  83,433
<TOTAL-ASSETS>                               1,275,229
<CURRENT-LIABILITIES>                          140,484
<BONDS>                                        230,000
                                0
                                          0
<COMMON>                                           114
<OTHER-SE>                                     904,745
<TOTAL-LIABILITY-AND-EQUITY>                 1,275,229
<SALES>                                      1,007,293
<TOTAL-REVENUES>                             1,007,293
<CGS>                                          391,100
<TOTAL-COSTS>                                  391,100
<OTHER-EXPENSES>                               391,361
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                              12,402
<INCOME-PRETAX>                                245,329
<INCOME-TAX>                                    63,452
<INCOME-CONTINUING>                            181,877
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                        9,000
<NET-INCOME>                                   172,877
<EPS-BASIC>                                       1.53
<EPS-DILUTED>                                     1.46


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 5
<MULTIPLIER> 1,000

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          MAR-31-1997
<PERIOD-START>                             APR-01-1996
<PERIOD-END>                               MAR-31-1997
<CASH>                                         318,075
<SECURITIES>                                   230,366
<RECEIVABLES>                                  137,669
<ALLOWANCES>                                     5,098
<INVENTORY>                                     53,184
<CURRENT-ASSETS>                               817,948
<PP&E>                                         199,548
<DEPRECIATION>                                  57,949
<TOTAL-ASSETS>                               1,043,494
<CURRENT-LIABILITIES>                          124,319
<BONDS>                                        230,850
                                0
                                          0
<COMMON>                                           112
<OTHER-SE>                                     688,325
<TOTAL-LIABILITY-AND-EQUITY>                 1,043,494
<SALES>                                        933,868
<TOTAL-REVENUES>                               933,868
<CGS>                                          388,969
<TOTAL-COSTS>                                  388,969
<OTHER-EXPENSES>                               383,671
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                               2,744
<INCOME-PRETAX>                                171,781
<INCOME-TAX>                                    64,220
<INCOME-CONTINUING>                            107,561
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                   107,561
<EPS-BASIC>                                       0.99
<EPS-DILUTED>                                     0.93


</TABLE>


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