EMC CORP
S-8, 1996-03-01
COMPUTER PERIPHERAL EQUIPMENT, NEC
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<PAGE>
 
                                                   Registration No. 33-_________

    As filed with the Securities and Exchange Commission on March 1, 1996.

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                    ________________________________________

                                    FORM S-8
                          REGISTRATION STATEMENT UNDER
                           THE SECURITIES ACT OF 1933

                                EMC CORPORATION
             (Exact name of registrant as specified in its charter)

              Massachusetts                            04-2680009
          (State or other juris-                    (I.R.S. Employer
         diction of incorporation                  Identification No.)
            or organization)

                                171 South Street
                         Hopkinton, Massachusetts 01748
          (Address, including zip code of Principal Executive Offices)

               McDATA CORPORATION 1990 CLASS A STOCK OPTION PLAN
               McDATA CORPORATION 1990 CLASS B STOCK OPTION PLAN
                           (Full Title of the Plans)

                                 Paul T. Dacier
                       Vice President and General Counsel
                                EMC Corporation
                                171 South Street
                         Hopkinton, Massachusetts 01748
                                 (508) 435-1000
                      (Name, address and telephone number,
                   including area code, of agent for service)
                    ________________________________________

                        CALCULATION OF REGISTRATION FEE

<TABLE>
<CAPTION>
===============================================================================================================
Title of each class of                        Proposed maximum       Proposed maximum          Amount of 
  securities to be         Amount to be      offering price per     aggregate offering        registration  
   registered               registered            share(1)                price                   fee
- --------------------------------------------------------------------------------------------------------------- 
<S>                       <C>                <C>                    <C>                        <C>
Common Stock, $.01 par
 value per share          493,400 shares          $11.42              $5,634,628.00            $1,942.98
===============================================================================================================
</TABLE>

(1) Estimated solely for the purpose of determining the registration fee
    pursuant to Rule 457(h)(1) based upon the maximum exercise price of options
    granted pursuant to the listed plans.
<PAGE>
 
                                    PART II
               INFORMATION REQUIRED IN THE REGISTRATION STATEMENT

ITEM 3.   INCORPORATION OF DOCUMENTS BY REFERENCE.

          The following documents which have been filed with the Securities and
Exchange Commission pursuant to the Securities Exchange Act of 1934, as amended
(the "Exchange Act"), are hereby incorporated by reference in this Registration
Statement:

          (a) the Registrant's latest Annual Report filed pursuant to Section
13(a) or 15(d) of the Exchange Act;

          (b) all other reports filed pursuant to Section 13(a) or 15(d) of the
Exchange Act since the end of the fiscal year covered by the Annual Report
referred to in (a) above; and

          (c) the description of the Registrant's Common Stock contained in the
Registrant's Registration Statement filed under the Exchange Act, including any
amendment or report filed for the purpose of updating such description.

          In addition, all documents subsequently filed by the Registrant
pursuant to Sections 13(a), 13(c), 14 or 15(d) of the Exchange Act prior to the
termination of this offering shall be deemed to be incorporated by reference in
this Registration Statement and to be a part hereof from the date of filing of
such documents (such documents, and the documents enumerated above, being
hereinafter referred to as the "Incorporated Documents").  Any statement
contained in an Incorporated Document shall be deemed to be modified or
superseded for all purposes to the extent that a statement contained in this
Registration Statement or in any other subsequently filed Incorporated Document
or in any prospectus or prospectus supplement modifies or supersedes such
statement.


ITEM 4.   DESCRIPTION OF SECURITIES.

          Not applicable.


ITEM 5.   INTERESTS OF NAMED EXPERTS AND COUNSEL.

          The legality of the shares of the Registrant's common stock being
registered pursuant to this Registration Statement will be passed upon for the
Registrant by Paul T. Dacier, Vice President and General Counsel of the
Registrant. As of December 31, 1995, Mr. Dacier was the beneficial owner (for
purposes of the Exchange Act) of 49,768 shares of the Registrant's common stock.

                                      II-1
<PAGE>
 
ITEM 6.   INDEMNIFICATION OF DIRECTORS AND OFFICERS.

          Under Section 9 of the Amended and Restated Bylaws of the Registrant,
the Registrant shall, to the extent legally permissible, indemnify each of its
directors and officers (including persons who were at its request serving as
directors, officers or trustees of another organization or in any capacity with
respect to any employee benefit plan) against all liabilities and expenses,
including amounts paid in satisfaction of judgments, in compromise or as fines
and penalties, and counsel fees, reasonably incurred by him in connection with
the defense or disposition of any action, suit or other proceeding, whether
civil or criminal, in which he may be involved or with which he may be
threatened, while in office or thereafter, by reason of his being or having been
such a director or officer, except with respect to any matter as to which he
shall have been adjudicated in any proceeding not to have acted in good faith in
the reasonable belief that his action was in the best interests of the
Registrant (any person serving another organization in one or more of the
indicated capacities at the request of the Registrant who shall have acted in
good faith in the reasonable belief that his action was in the best interests of
such other organization to be deemed as having acted in such manner with respect
to the Registrant) or, to the extent that such matter relates to service with
respect to any employee benefit plan, in the best interests of the participants
or beneficiaries of such employee benefit plan; provided, however, that as to
any matter disposed of by a compromise payment by such director or officer,
pursuant to a consent decree or otherwise, no indemnification either for said
payment or for any other expenses shall be provided unless such compromise shall
be approved as in the best interests of the Registrant, after notice that it
involves such indemnification: (a) by a disinterested majority of the directors
then in office; or (b) by a majority of the disinterested directors then in
office, provided that there has been obtained an opinion in writing of
independent legal counsel to the effect that such director or officer appears to
have acted in good faith in the reasonable belief that his action was in the
best interests of the Registrant; or (c) by the holders of a majority of the
outstanding stock at the time  entitled to vote for directors, voting as a
single class, exclusive of any stock owned by any interested director or
officer.  Expenses, including counsel fees, reasonably incurred by any director
or officer in connection with the defense or disposition of any such action,
suit or other proceeding may be paid from time to time by the Registrant in
advance of the final disposition thereof upon receipt of an undertaking by such
director or officer to repay the amounts so paid to the Registrant if it is
ultimately determined that indemnification for such expenses is not authorized
under Section 9.  The right of indemnification provided by Section 9 shall not
be exclusive of or affect any other rights to which any director or officer may
be entitled.  As used in Section 9, the terms "director" and "officer" include
their respective heirs, executors and administrators, and an "interested"
director or officer is one against whom in such capacity the proceedings in
question or another proceeding on the same or similar grounds is then pending.
Nothing contained in Section 9 shall affect any rights to indemnification to
which corporate personnel other than directors and officers may be entitled by
contract or otherwise under law.

                                      II-2
<PAGE>
 
ITEM 7.   EXEMPTION FROM REGISTRATION CLAIMED.

          Not applicable.


ITEM 8.   EXHIBITS.

     4.1  Form of stock certificate (incorporated by reference from the
          Registrant's Annual Report on Form 10-K for the fiscal year ended
          December 31, 1987, as filed with the Commission on March 31, 1988).

     4.2  McDATA Corporation 1990 Class A Stock Option Plan.

     4.3  McDATA Corporation 1990 Class B Stock Option Plan.

     5.1  Opinion of Paul T. Dacier regarding the legality of the Common Stock
          being registered.

    23.1  Consent of Coopers & Lybrand L.L.P.

    23.2  Consent of Paul T. Dacier (included in the opinion filed as Exhibit
          5.1).

    25.1  Power of Attorney (included in Part II of this Registration Statement
          under the caption "Signatures").

ITEM 9.   UNDERTAKINGS.

          The undersigned registrant hereby undertakes:

          a.   To file, during any period in which offers or sales are being
made, a post-effective amendment to this registration statement to include any
material information with respect to the plan of distribution not previously
disclosed in the registration statement or any material change to such
information.

          b.   That, for the purpose of determining any liability under the
Securities Act of 1933, each post-effective amendment shall be deemed to be a
new registration statement relating to the securities offered therein, and the
offering of such securities at that time shall be deemed to be the initial bona
fide offering thereof.

          c.   To remove from registration by means of a post-effective
amendment any of the securities being registered which remain unsold at the
termination of the offering.

                                      II-3
<PAGE>
 
          d.   That, for purposes of determining any liability under the
Securities Act of 1933, each filing of the registrant's annual report pursuant
to Section 13(a) or Section 15(d) of the Exchange Act (and, where applicable,
each filing of an employee benefit plan's annual report pursuant to Section
15(d) of the Exchange Act) that is incorporated by reference in the registration
statement shall be deemed to be a new registration statement relating to the
securities offered therein, and the offering of such securities at that time
shall be deemed to be the initial bona fide offering thereof.

          e.   To deliver or cause to be delivered with the prospectus, to each
person to whom the prospectus is sent or given, the latest annual report to
security holders that is incorporated by reference in the prospectus and
furnished pursuant to and meeting the requirements of Rule 14a-3 or Rule 14c-3
under the Exchange Act; and, where interim financial information required to be
presented by Article 3 of Regulation S-X is not set forth in the prospectus, to
deliver, or cause to be delivered to each person to whom the prospectus is sent
or given, the latest quarterly report that is specifically incorporated by
reference in the prospectus to provide such interim financial information.

          f.   Insofar as indemnification for liabilities arising under the
Securities Act of 1933 may be permitted to directors, officers and controlling
persons of the Registrant pursuant to the foregoing provisions, or otherwise,
the Registrant has been advised that in the opinion of the Securities and
Exchange Commission such indemnification is against public policy as expressed
in the Act and is, therefore, unenforceable. In the event that a claim for
indemnification against such liabilities (other than the payment by the
Registrant of expenses incurred or paid by a director, officer or controlling
person of the Registrant in the successful defense of any action, suit or
proceeding) is asserted by such director, officer or controlling person in
connection with the securities being registered, the Registrant will, unless in
the opinion of its counsel the matter has been settled by controlling precedent,
submit to a court of appropriate jurisdiction the question whether such
indemnification by it is against public policy as expressed in the Act and will
be governed by the final adjudication of such issue.

                                      II-4
<PAGE>
 
                                   SIGNATURES

    Pursuant to the requirements of the Securities Act of 1933, the Registrant
certifies that it has reasonable grounds to believe that it meets all of the
requirements for filing on Form S-8 and has duly caused this Registration
Statement to be signed on its behalf by the undersigned, thereunto duly
authorized, in the City of Hopkinton, State of Massachusetts, on February 28,
1996.

                               EMC CORPORATION

                               By:  /s/ Richard J. Egan
                                    ------------------------
                                    Richard J. Egan, Chairman of the Board


    Each of the undersigned directors and/or officers of the Registrant, by
virtue of his or her signature to this Registration Statement appearing below,
hereby constitutes and appoints Michael C. Ruettgers, Colin G. Patteson and Paul
T. Dacier, and each of them singly, with full power of substitution and
resubstitution, as attorneys-in-fact in his or her name, place and stead to
execute any and all amendments to this Registration Statement in the capacity or
capacities set forth opposite his or her name and hereby ratifies all that said
attorneys-in-fact may do by virtue hereof.

    PURSUANT TO THE REQUIREMENTS OF THE SECURITIES ACT OF 1933, THIS
REGISTRATION STATEMENT HAS BEEN SIGNED BY THE FOLLOWING PERSONS IN THE
CAPACITIES AND ON THE DATES INDICATED.


SIGNATURE                 TITLE                                DATE
- ---------                 -----                                ----

/s/ Richard J. Egan       Chairman of the Board (Principal     February 28, 1996
- ------------------------   Executive Officer) and Director
Richard J. Egan            


/s/ Michael C. Ruettgers  President, Chief Executive Officer   February 28, 1996
- ------------------------   and Director
Michael C. Ruettgers         


/s/ John R. Egan          Executive Vice President, Sales and  February 28, 1996
- ----------------------     Director
John R. Egan             


/s/ Colin G. Patteson     Vice President and Chief Financial   February 28, 1996
- ---------------------      Officer (Principal Financial 
Colin G. Patteson          Officer)
 
 
/s/ William J. Teuber    Vice President and Controller         February 28, 1996
- -----------------------   (Principal Accounting Officer)
William J. Teuber        
                                    

                                      II-5
<PAGE>
 
- -----------------------  Director                              February 28, 1996
W. Paul Fitzgerald

 
/s/ Joseph F. Oliveri    Director                              February 28, 1996
- -----------------------
Joseph F. Oliveri

 
/s/ Michael J. Cronin    Director                              February 28, 1996
- -----------------------
Michael J. Cronin
 

/s/ Maureen E. Egan      Director                              February 28, 1996
- -----------------------
Maureen E. Egan
 
                         Director                              February 28, 1996
- -----------------------
John F. Cunningham

                                      II-6

<PAGE>
 
                                                                     Exhibit 4.2

                               McDATA CORPORATION

                         1990 CLASS A STOCK OPTION PLAN

                     (As approved by the Board of Directors
                              on August 28, 1990,
                           and by the Stockholders on
                               November 16, 1990)


I.       Purpose

         The McDATA Corporation 1990 Class A Stock Option Plan ("Plan") provides
         for the grant of Stock Options to Employees of McDATA Corporation (the
         "Company"), and such of its subsidiaries (as defined in Section 425(f)
         of the Internal Revenue Code of 1986 (the "Code")) as the Board of
         Directors of the Company (the "Board") shall from time to time
         designate ("Participating Subsidiaries"), in order to advance the
         interests of the Company and its Participating Subsidiaries through the
         motivation, attraction and retention of their respective Employees.

II.      Incentive Stock Options and Non-Incentive Stock Options

         The Stock Options granted under the Plan may be either:

         (a)   Incentive Stock Options ("ISOs") which are intended to be
               "Incentive Stock Options" as that term is defined in Section 422A
               of the Code; or

         (b)   Nonstatutory Stock Options ("NSOs") which are intended to be
               options that do not qualify as "Incentive Stock Options" under
               Section 422A of the Code.

         All Stock Options shall be ISOs unless the Option Agreement clearly
         designates the Stock Options granted thereunder, or a specified portion
         thereof, as NSOs or unless the stockholders of the Company do not
         approve the Plan within twelve months after the Plan is adopted by the
         Board.  If the Plan is not approved by the stockholders of the Company
         within twelve months after the Plan is adopted by the Board, any ISO
         granted under the Plan shall be treated as an NSO as of the original
         date of grant, but all other terms and conditions of such Stock Options
         shall continue in effect.  Subject to the other provisions of the Plan,
         a Participant 

                                       1
<PAGE>
 
         may receive ISOs and NSOs at the same time, provided that
         the ISOs and NSOs are clearly designated as such.

         Except as otherwise expressly provided herein, all of the provisions
         and requirements of the Plan relating to Stock Options shall apply to
         ISOs and NSOs.

III.     Administration

         3.1  Committee.  The Plan shall be administered by a committee 
              --------- 
              ("Committee") composed of at least two members of the Board of
              Directors. The Board of Directors may reserve to itself any of the
              authority granted to the Committee as set forth herein, and it may
              perform and discharge all of the functions and responsibilities of
              the Committee at any time that a duly constituted Committee is not
              appointed and serving. All references in this Plan to the
              "Committee" shall be deemed to refer to the Board of Directors
              whenever the Board is discharging the powers and responsibilities
              of the Committee. The Committee or the Board, as the case may be,
              shall have full authority to administer the Plan, including
              authority to interpret and construe any provision of the Plan and
              any Stock Option granted thereunder, and to adopt such rules and
              regulations for administering the Plan as it may deem necessary in
              order to comply with the requirements of the Code or in order that
              Stock Options that are intended to be ISOs will be classified as
              incentive stock options under the Code, or in order to conform to
              any regulation or to any change in any law or regulation
              applicable thereto. The Committee or the Board may delegate any of
              its responsibilities under the Plan, other than its responsibility
              to grant Stock Options or to interpret and construe the Plan.

         3.2  Actions of Committee.  All actions taken and all interpretations
              --------------------
              and determinations made by the Committee in good faith (including
              determinations of Fair Market Value) shall be final and binding
              upon all Participants, the Company and all other interested
              persons. No member of the Committee shall be personally liable for
              any action, determination or interpretation made in good faith
              with respect to the Plan, and all members of the Committee shall,
              in addition to their rights as directors, be fully protected by
              the Company with respect to any such action, determination or
              interpretation.

IV.      Definitions

         4.1  "Stock Option." A Stock Option is the right granted under the 
               -------------
              Plan to an Employee to purchase, at such time or times and at such
              price or prices 

                                       2
<PAGE>
 
              ("Option Price") as are determined by the Committee, the number of
              shares of Common Stock determined by the Committee.

         4.2  "Common Stock." A share of Common Stock means a share of 
               -------------
              authorized but unissued or reacquired Class A Common Stock (par
              value $.001 per share) of the Company.

         4.3  "Fair Market Value." If the Common Stock is not traded publicly,
               ------------------                                   
              the Fair Market Value of a share of Common Stock on any date shall
              be determined, in good faith, by the Board or the Committee after
              such consultation with outside legal, accounting and other experts
              as the Board or the Committee may deem advisable, and the Board or
              the Committee shall maintain a written record of its method of
              determining such value. If the Common Stock is traded publicly,
              the Fair Market Value of a share of Common Stock on any date shall
              be the average of the representative closing bid and asked prices,
              as quoted by the National Association of Securities Dealers
              through NASDAQ (its automated system for reporting quotes), for
              the date in question or, if the Common Stock is listed on the
              NASDAQ National Market System or is listed on a national stock
              exchange, the officially quoted closing price on NASDAQ or such
              exchange, as the case may be, on the date in question.

         4.4  "Employee".  An Employee is an employee of the Company or any 
               ---------
              Participating Subsidiary.

         4.5  "Participant".  A Participant is an Employee to whom a Stock 
               ------------                       
              Option is granted.

V.       Eligibility and Participation

         Grants of Stock Options under this Plan may be made to Employees who
         are, at the time of grant, holders of Class A Common Stock or of
         options to acquire Class A Common Stock of the Company.  Any Director
         of the Company or of a Participating Subsidiary who is also an Employee
         shall also be eligible to receive Stock Options, but Directors who are
         not Employees shall not be eligible to receive Stock Options under the
         Plan.

         The Committee shall from time to time determine the Employees to whom
         Stock Options shall be granted, the number of shares of Common Stock
         subject to each Stock Option to be granted to each such Employee, the
         Option Price of such Stock Options, all as provided in this Plan.  The
         Option Price of any ISO shall be not less than the Fair Market Value of
         a share of Common Stock on the date on which the Stock Option is
         granted.  The Option Price of an NSO shall not be less than 

                                       3
<PAGE>
 
         50% of the Fair Market Value of a share of Common Stock on the date the
         NSO is granted. If an ISO is granted to an Employee who then owns stock
         possessing more than 10% of the total combined voting power of all
         classes of stock of the Company or any parent or subsidiary corporation
         of the Company, the Option Price of such ISO shall be at least 110% of
         the Fair Market Value of the Common Stock subject to the ISO at the
         time such ISO is granted, and such ISO shall not be exercisable after
         five years after the date on which it was granted. Each Stock Option
         shall be evidenced by a written agreement ("Option Agreement")
         containing such terms and provisions as the Committee may determine,
         subject to the provisions of this Plan.

VI.      Shares of Common Stock Subject to the Plan

         6.1  Maximum Number.  The maximum aggregate number of shares of Common
              --------------                                                   
              Stock that may be made subject to stock options under this Plan
              shall be 3,000,000 shares; provided that such number of shares
              shall be reduced by the number of shares subject to outstanding
              options under the Company's 1982 Incentive Stock Option Plan. To
              the extent that if the aggregate Fair Market Value (determined as
              of the time a Stock Option is granted) of the Common Stock subject
              to a Stock Option that first becomes exercisable in a particular
              calendar year exceeds $100,000, the Stock Option shall be treated
              as an NSO with respect to the portion of such shares having a Fair
              Market Value in excess of $100,000. If any shares of Common Stock
              subject to Stock Options are not purchased or otherwise paid for
              before such Stock Options expire, such shares may again be made
              subject to Stock Options.

         6.2  Capital Changes.  In the event any changes are made to the 
              --------------- 
              outstanding shares of Common Stock (whether by reason of merger,
              consolidation, reorganization, recapitalization, stock dividend in
              excess of ten percent (10%) at any single time, stock split,
              combination of shares, exchange of shares, change in corporate
              structure or otherwise), appropriate adjustments shall be made in:
              (i) the number of shares of Common Stock theretofore made subject
              to Stock Options, and in the purchase price of said shares; and
              (ii) the aggregate number of shares which may be made subject to
              Stock Options. If any of the foregoing adjustments shall result in
              a fractional share, the fraction shall be disregarded, and the
              Company shall have no obligation to make any cash or other payment
              with respect to such a fractional share.

VII.     Exercise of Stock Options

                                       4
<PAGE>
 
         7.1  Time of Exercise.  Subject to the provisions of the Plan, the
              ----------------                                             
              Committee, in its discretion, shall determine the time when a
              Stock Option, or a portion of a Stock Option, shall become
              exercisable, and the time when a Stock Option, or a portion of a
              Stock Option, shall expire. Such time or times shall be set forth
              in the Option Agreement evidencing such Stock Option. Unless
              otherwise determined by the Committee, a Stock Option shall become
              exercisable in four equal installments on the first four
              anniversaries of the date of grant. A Stock Option shall expire,
              to the extent not exercised, no later than the tenth anniversary
              of the date on which it was granted. The Committee may accelerate
              the vesting of any Participant's Stock Option by giving written
              notice to the Participant. Upon receipt of such notice, the
              Participant and the Company shall amend the Option Agreement to
              reflect the new vesting schedule. Unless otherwise determined by
              the Committee, the acceleration of the exercise period of a Stock
              Option shall not affect the expiration date of that Stock Option.

         7.2  Exchange of Outstanding Stock.  The Committee, in its sole 
              -----------------------------
              discretion, may permit a Participant to surrender to the Company
              shares of the Common Stock previously acquired by the Participant
              as part of full payment for the exercise of a Stock Option. Such
              surrendered shares shall be valued at their Fair Market Value on
              the date of exercise. Unless otherwise determined by the
              Committee, any such shares surrendered by the Participant shall
              have been held by him for at least six months prior to surrender.

         7.3  Stock Restriction Agreement.  The Committee may provide that 
              ---------------------------      
              shares of Common Stock issuable upon the exercise of a Stock
              Option shall, under certain conditions, be subject to restrictions
              whereby the Company has a right of first refusal with respect to
              such shares or a right or obligation to repurchase all or a
              portion of such shares, which restrictions may survive a
              Participant's term of employment with the Company. The
              acceleration of the time or times at which the Stock Option
              becomes exercisable may be conditioned upon the Participant's
              agreement to such restrictions.

         7.4  Termination of Employment Before Exercise.  If a Participant's 
              -----------------------------------------     
              employment with the Company or a Participating Subsidiary shall
              terminate for any reason other than the Participant's disability,
              any Stock Option then held by the Participant, to the extent then
              exercisable under the applicable Option Agreement(s), shall remain
              exercisable after the termination of his employment for a period
              of three months. If the Participant's employment is terminated
              because the Participant is disabled within the meaning of Section
              22(e)(3) of the Code, any Stock Option then 

                                       5
<PAGE>
 
              held by the Participant, to the extent then exercisable under the
              applicable Option Agreement(s), shall remain exercisable after the
              termination of his employment for a period of twelve months (but
              in no event beyond ten years from the date of grant of the Stock
              Option). If the Stock Option is not exercised during the
              applicable period, it shall be deemed to have been forfeited and
              of no further force or effect.

         7.5  Disposition of Forfeited Stock Options.  Any shares of Common 
              --------------------------------------
              Stock subject to Stock Options forfeited by a Participant shall
              not thereafter be eligible for purchase by the Participant but may
              be made subject to Stock Options granted to other Participants.

VIII.    No Contract of Employment

         Nothing in this Plan shall confer upon the Participant the right to
         continue in the employ of the Company, or any Participating Subsidiary,
         nor shall it interfere in any way with the right of the Company, or any
         such Participating Subsidiary, to discharge the Participant at any time
         for any reason whatsoever, with or without cause.  Nothing in this
         Article VIII shall affect any rights or obligations of the Company or
         any Participant under any written contract of employment.

IX.      No Rights as a Stockholder

         A Participant shall have no rights as a stockholder with respect to any
         shares of Common Stock subject to a Stock Option.  Except as provided
         in Section 6.2, no adjustment shall be made in the number of shares of
         Common Stock issued to a Participant, or in any other rights of the
         Participant upon exercise of a Stock Option by reason of any dividend,
         distribution or other right granted to stockholders for which the
         record date is prior to the date of exercise of the Participant's Stock
         Option.

X.       Assignability

         No Stock Option granted under this Plan, nor any other rights acquired
         by a Participant under this Plan, shall be assignable or transferable
         by a Participant, other than by will or the laws of descent and
         distribution, and are exercisable, during his lifetime, only by him.
         Notwithstanding the preceding sentence, the Committee may, in its sole
         discretion, permit the assignment or transfer of an NSO and the
         exercise thereof by a person other than a Participant, on such terms
         and conditions as the Committee in its sole discretion may determine.
         Any such terms shall be determined at the time the NSO is granted, and
         shall be set forth in the Option Agreement.  In the event of his death,
         the Stock Option may be exercised by the Personal Representative of the
         Participant's estate or, if no 

                                       6
<PAGE>
 
         Personal Representative has been appointed, by the successor or
         successors in interest determined under the Participant's will or under
         the applicable laws of descent and distribution.

XI.      Amendment

         The Board may from time to time alter, amend, suspend or discontinue
         the Plan, including, where applicable, any modifications or amendments
         as it shall deem advisable in order that ISOs will be classified as
         incentive stock options under the Code, or in order to conform to any
         regulation or to any change in any law or regulation applicable
         thereto; provided, however, that no such action shall adversely affect
         the rights and obligations with respect to Stock Options at any time
         outstanding under the Plan.

XII.     Registration of Optioned Shares

         The Stock Options shall not be exercisable unless the purchase of such
         optioned shares is pursuant to an applicable effective registration
         statement under the Securities Act of 1933, as amended, or unless, in
         the opinion of counsel to the Company, the proposed purchase of such
         optioned shares would be exempt from the registration requirements of
         the Securities Act of 1933, as amended, and from the registration or
         qualification requirements of applicable state securities laws.

XIII.    Withholding Taxes

         The Company or Participating Subsidiary may take such steps as it may
         deem necessary or appropriate for the withholding of any taxes which
         the Company or the Participating Subsidiary is required by any law or
         regulation or any governmental authority, whether federal, state or
         local, domestic or foreign, to withhold in connection with any Stock
         Option, including, but not limited to, the withholding of all or any
         portion of any issuance of shares of Common Stock upon the exercise of
         any Stock Option until the Participant reimburses the Company or
         Participating Subsidiary for the amount the Company or Participating
         Subsidiary is required to withhold with respect to such taxes, or
         cancelling any portion of such issuance in an amount sufficient to
         reimburse itself for the amount it is required to so withhold.

XIV.     Brokerage Arrangements

         The Committee, in its discretion, may enter into arrangements with one
         or more banks, brokers or other financial institutions to facilitate
         the disposition of shares acquired upon exercise of Stock Options,
         including, without limitation, 

                                       7
<PAGE>
 
         arrangements for the simultaneous exercise of Stock Options and sale of
         the shares acquired upon such exercise.

XV.      Nonexclusivity of the Plan

         Neither the adoption of the Plan by the Board nor the submission of the
         Plan to stockholders of the Company for approval shall be construed as
         creating any limitations on the power or authority of the Board to
         adopt such other or additional incentive or other compensation
         arrangements of whatever nature as the Board may deem necessary or
         desirable or preclude or limit the continuation of any other plan,
         practice or arrangement for the payment of compensation or fringe
         benefits to employees generally, or to any class or group of employees,
         which the Company or any Subsidiary now has lawfully put into effect,
         including, without limitation, any retirement, pension, savings and
         stock purchase plan, insurance, death and disability benefits and
         executive short-term incentive plans.

XVI.     Effective Date

         This Plan was adopted by the Board of Directors and became effective on
         August 28, 1990, and was approved by the Company's stockholders on
         November 16, 1990.  No Stock Options shall be granted subsequent to ten
         years after the effective date of the Plan.  Stock Options outstanding
         subsequent to ten years after the effective date of the Plan shall
         continue to be governed by the provisions of the Plan.

                                       8

<PAGE>
 
                                                                     Exhibit 4.3

                               McDATA CORPORATION

                         1990 CLASS B STOCK OPTION PLAN

                     (As approved by the Board of Directors
                          on July 27, 1990, and by the
                       Stockholders on November 16, 1990)


I.       Purpose

         The McDATA Corporation 1990 Class B Stock Option Plan ("Plan") provides
         for the grant of Stock Options to Employees of McDATA Corporation (the
         "Company"), and such of its subsidiaries (as defined in Section 425(f)
         of the Internal Revenue Code of 1986 (the "Code")) as the Board of
         Directors of the Company (the "Board") shall from time to time
         designate ("Participating Subsidiaries"), in order to advance the
         interests of the Company and its Participating Subsidiaries through the
         motivation, attraction and retention of their respective Employees.

II.      Incentive Stock Options and Non-Incentive Stock Options

         The Stock Options granted under the Plan may be either:

         (a)  Incentive Stock Options ("ISOs") which are intended to be
              "Incentive Stock Options" as that term is defined in Section 422A
              of the Code; or

         (b)  Nonstatutory Stock Options ("NSOs") which are intended to be
              options that do not qualify as "Incentive Stock Options" under
              Section 422A of the Code.

         All Stock Options shall be ISOs unless the Option Agreement clearly
         designates the Stock Options granted thereunder, or a specified portion
         thereof, as NSOs or unless the stockholders of the Company do not
         approve the Plan within twelve months after the Plan is adopted by the
         Board.  If the Plan is not approved by the stockholders of the Company
         within twelve months after the Plan is adopted by the Board, any ISO
         granted under the Plan shall be treated as an NSO as of the original
         date of grant, but all other terms and conditions of such Stock Options
         shall continue in effect.  Subject to the other provisions of the Plan,
         a Participant may receive ISOs and NSOs at the same time, provided that
         the ISOs and NSOs are clearly designated as such.

                                       1
<PAGE>
 
         Except as otherwise expressly provided herein, all of the provisions
         and requirements of the Plan relating to Stock Options shall apply to
         ISOs and NSOs.

III.     Administration

         3.1  Committee.  The Plan shall be administered by a committee
              ---------                                                
              ("Committee") composed of at least two members of the Board of
              Directors. The Board of Directors may reserve to itself any of the
              authority granted to the Committee as set forth herein, and it may
              perform and discharge all of the functions and responsibilities of
              the Committee at any time that a duly constituted Committee is not
              appointed and serving. All references in this Plan to the
              "Committee" shall be deemed to refer to the Board of Directors
              whenever the Board is discharging the powers and responsibilities
              of the Committee. The Committee or the Board, as the case may be,
              shall have full authority to administer the Plan, including
              authority to interpret and construe any provision of the Plan and
              any Stock Option granted thereunder, and to adopt such rules and
              regulations for administering the Plan as it may deem necessary in
              order to comply with the requirements of the Code or in order that
              Stock Options that are intended to be ISOs will be classified as
              incentive stock options under the Code, or in order to conform to
              any regulation or to any change in any law or regulation
              applicable thereto. The Committee or the Board may delegate any of
              its responsibilities under the Plan, other than its responsibility
              to grant Stock Options or to interpret and construe the Plan.

         3.2  Actions of Committee.  All actions taken and all interpretations
              --------------------   
              and determinations made by the Committee in good faith (including
              determinations of Fair Market Value) shall be final and binding
              upon all Participants, the Company and all other interested
              persons. No member of the Committee shall be personally liable for
              any action, determination or interpretation made in good faith
              with respect to the Plan, and all members of the Committee shall,
              in addition to their rights as directors, be fully protected by
              the Company with respect to any such action, determination or
              interpretation.

IV.      Definitions

         4.1  "Stock Option." A Stock Option is the right granted under the 
               ------------- 
              Plan to an Employee to purchase, at such time or times and at such
              price or prices ("Option Price") as are determined by the
              Committee, the number of shares of Common Stock determined by the
              Committee.

                                       2
<PAGE>
 
         4.2  "Common Stock." A share of Common Stock means a share
               -------------                                       
               of authorized but unissued or reacquired Class B Common Stock
               (par value $.001 per share) of the Company.

         4.3  "Fair Market Value." If the Common Stock is not traded publicly,
               ------------------  
              the Fair Market Value of a share of Common Stock on any date shall
              be determined, in good faith, by the Board or the Committee after
              such consultation with outside legal, accounting and other experts
              as the Board or the Committee may deem advisable, and the Board or
              the Committee shall maintain a written record of its method of
              determining such value. If the Common Stock is traded publicly,
              the Fair Market Value of a share of Common Stock on any date shall
              be the average of the representative closing bid and asked prices,
              as quoted by the National Association of Securities Dealers
              through NASDAQ (its automated system for reporting quotes), for
              the date in question or, if the Common Stock is listed on the
              NASDAQ National Market System or is listed on a national stock
              exchange, the officially quoted closing price on NASDAQ or such
              exchange, as the case may be, on the date in question.

         4.4  "Employee".  An Employee is an employee of the Company or any
               ---------                                                   
              Participating Subsidiary.

         4.5  "Participant".  A Participant is an Employee to whom a Stock 
               ------------
              Option is granted.

V.       Eligibility and Participation

         Grants of Stock Options may be made to Employees of the Company or any
         Participating Subsidiary.  Any Director of the Company or of a
         Participating Subsidiary who is also an Employee shall also be eligible
         to receive Stock Options, but Directors who are not Employees shall not
         be eligible to receive Stock Options under the Plan.  The Committee
         shall from time to time determine the Employees to whom Stock Options
         shall be granted, the number of shares of Common Stock subject to each
         Stock Option to be granted to each such Employee, the Option Price of
         such Stock Options, all as provided in this Plan.  The Option Price of
         any ISO shall be not less than the Fair Market Value of a share of
         Common Stock on the date on which the Stock Option is granted.  The
         Option Price of an NSO shall not be less than 50% of the Fair Market
         Value of a share of Common Stock on the date the NSO is granted.  If an
         ISO is granted to an Employee who then owns stock possessing more than
         10% of the total combined voting power of all classes of stock of the
         Company or any parent or subsidiary corporation of the Company, the
         Option Price of 

                                       3
<PAGE>
 
         such ISO shall be at least 110% of the Fair Market Value of the Common
         Stock subject to the ISO at the time such ISO is granted, and such ISO
         shall not be exercisable after five years after the date on which it
         was granted. Each Stock Option shall be evidenced by a written
         agreement ("Option Agreement") containing such terms and provisions as
         the Committee may determine, subject to the provisions of this Plan.

VI.      Shares of Common Stock Subject to the Plan

         6.1  Maximum Number.  The maximum aggregate number of shares of Common
              --------------                                                   
              Stock that may be made subject to stock options under this Plan
              shall be 1,500,000 shares; provided that such number of shares
              shall be reduced by the number of shares subject to outstanding
              options under the Company's 1988 Incentive Stock Option Plan and
              Director Stock Option Plan, and by the number of shares issued
              under the Company's Employee Stock Purchase Plan and 401(k) Plan.
              To the extent that if the aggregate Fair Market Value (determined
              as of the time a Stock Option is granted) of the Common Stock
              subject to a Stock Option that first becomes exercisable in a
              particular calendar year exceeds $100,000, the Stock Option shall
              be treated as an NSO with respect to the portion of such shares
              having a Fair Market Value in excess of $100,000. If any shares of
              Common Stock subject to Stock Options are not purchased or
              otherwise paid for before such Stock Options expire, such shares
              may again be made subject to Stock Options.

         6.2  Capital Changes.  In the event any changes are made to the 
              ---------------
              outstanding shares of Common Stock (whether by reason of merger,
              consolidation, reorganization, recapitalization, stock dividend in
              excess of ten percent (10%) at any single time, stock split,
              combination of shares, exchange of shares, change in corporate
              structure or otherwise), appropriate adjustments shall be made in:
              (i) the number of shares of Common Stock theretofore made subject
              to Stock Options, and in the purchase price of said shares; and
              (ii) the aggregate number of shares which may be made subject to
              Stock Options. If any of the foregoing adjustments shall result in
              a fractional share, the fraction shall be disregarded, and the
              Company shall have no obligation to make any cash or other payment
              with respect to such a fractional share. VII. Exercise of Stock
              Options

VII.     Exercise of Stock Options

                                       4
<PAGE>
 
         7.1  Time to Exercise.  Subject to the provisions of the Plan, the
              ----------------                                             
              Committee, in its discretion, shall determine the time when a
              Stock Option, or a portion of a Stock Option, shall become
              exercisable, and the time when a Stock Option, or a portion of a
              Stock Option, shall expire. Such time or times shall be set forth
              in the Option Agreement evidencing such Stock Option. Unless
              otherwise determined by the Committee, a Stock Option shall become
              exercisable in four equal installments on the first four
              anniversaries of the date of grant. A Stock Option shall expire,
              to the extent not exercised, no later than the tenth anniversary
              of the date on which it was granted. The Committee may accelerate
              the vesting of any Participant's Stock Option by giving written
              notice to the Participant. Upon receipt of such notice, the
              Participant and the Company shall amend the Option Agreement to
              reflect the new vesting schedule. Unless otherwise determined by
              the Committee, the acceleration of the exercise period of a Stock
              Option shall not affect the expiration date of that Stock Option.

         7.2  Exchange of Outstanding Stock.  The Committee, in its sole 
              -----------------------------
              discretion, may permit a Participant to surrender to the Company
              shares of the Common Stock previously acquired by the Participant
              as part of full payment for the exercise of a Stock Option. Such
              surrendered shares shall be valued at their Fair Market Value on
              the date of exercise. Unless otherwise determined by the
              Committee, any such shares surrendered by the Participant shall
              have been held by him for at least six months prior to surrender.

         7.3  Stock Restriction Agreement.  The Committee may provide that 
              ---------------------------
              shares of Common Stock issuable upon the exercise of a Stock
              Option shall, under certain conditions, be subject to restrictions
              whereby the Company has a right of first refusal with respect to
              such shares or a right or obligation to repurchase all or a
              portion of such shares, which restrictions may survive a
              Participant's term of employment with the Company. The
              acceleration of the time or times at which the Stock Option
              becomes exercisable may be conditioned upon the Participant's
              agreement to such restrictions.

         7.4  Termination of Employment Before Exercise.  If a Participant's
              -----------------------------------------                     
              employment with the Company or a Participating Subsidiary shall
              terminate for any reason other than the Participant's disability,
              any Stock Option then held by the Participant, to the extent then
              exercisable under the applicable Option Agreements), shall remain
              exercisable after the termination of his employment for a period
              of three months. If the Participant's employment is terminated
              because the Participant is 

                                       5
<PAGE>
 
              disabled within the meaning of Section 22(e)(3) of the Code, any
              Stock Option then held by the Participant, to the extent then
              exercisable under the applicable Option Agreement(s), shall remain
              exercisable after the termination of his employment for a period
              of twelve months (but in no event beyond ten years from the date
              of grant of the Stock Option). If the Stock Option is not
              exercised during the applicable period, it shall be deemed to have
              been forfeited and of no further force or effect.

         7.5  Disposition of Forfeited Stock Options.  Any shares of Common 
              --------------------------------------
              Stock subject to Stock Options forfeited by a Participant shall
              not thereafter be eligible for purchase by the Participant but may
              be made subject to Stock Options granted to other Participants.

VIII.    No Contract of Employment

         Nothing in this Plan shall confer upon the Participant the right to
         continue in the employ of the Company, or any Participating Subsidiary,
         nor shall it interfere in any way with the right of the Company, or any
         such Participating Subsidiary, to discharge the Participant at any time
         for any reason whatsoever, with or without cause.  Nothing in this
         Article VIII shall affect any rights or obligations of the Company or
         any Participant under any written contract of employment.

IX.      No Rights as a Stockholder

         A Participant shall have no rights as a stockholder with respect to any
         shares of Common Stock subject to a Stock Option.  Except as provided
         in Section 6.2, no adjustment shall be made in the number of shares of
         Common Stock issued to a Participant, or in any other rights of the
         Participant upon exercise of a Stock Option by reason of any dividend,
         distribution or other right granted to stockholders for which the
         record date is prior to the date of exercise of the Participant's Stock
         Option.

X.       Assignability

         No Stock Option granted under this Plan, nor any other rights acquired
         by a Participant under this Plan, shall be assignable or transferable
         by a Participant, other than by will or the laws of descent and
         distribution, and are exercisable, during his lifetime, only by him.
         Notwithstanding the preceding sentence, the Committee may, in its sole
         discretion, permit the assignment or transfer of an NSO and the
         exercise thereof by a person other than a Participant, on such terms
         and conditions as the Committee in its sole discretion may determine.
         Any such terms shall be determined at the time the NSO is granted, and
         shall 

                                       6
<PAGE>
 
         be set forth in the Option Agreement.  In the event of his death,
         the Stock Option may be exercised by the Personal Representative of the
         Participant's estate or, if no Personal Representative has been
         appointed, by the successor or successors in interest determined under
         the Participant's will or under the applicable laws of descent and
         distribution.

XI.      Amendment

         The Board may from time to time alter, amend, suspend or discontinue
         the Plan, including, where applicable, any modifications or amendments
         as it shall deem advisable in order that ISOs will be classified as
         incentive stock options under the Code, or in order to conform to any
         regulation or to any change in any law or regulation applicable
         thereto; provided, however, that no such action shall adversely affect
         the rights and obligations with respect to Stock Options at any time
         outstanding under the Plan.

XII.     Registration of Optioned Shares

         The Stock Options shall not be exercisable unless the purchase of such
         optioned shares is pursuant to an applicable effective registration
         statement under the Securities Act of 1933, as amended, or unless, in
         the opinion of counsel to the Company, the proposed purchase of such
         optioned shares would be exempt from the registration requirements of
         the Securities Act of 1933, as amended, and from the registration or
         qualification requirements of applicable state securities laws.

XIII.    Withholding Taxes

         The Company or Participating Subsidiary may take such steps as it may
         deem necessary or appropriate for the withholding of any taxes which
         the Company or the Participating Subsidiary is required by any law or
         regulation or any governmental authority, whether federal, state or
         local, domestic or foreign, to withhold in connection with any Stock
         Option, including, but not limited to, the withholding of all or any
         portion of any issuance of shares of Common Stock upon the exercise of
         any Stock Option until the Participant reimburses the Company or
         Participating Subsidiary for the amount the Company or Participating
         Subsidiary is required to withhold with respect to such taxes, or
         cancelling any portion of such issuance in an amount sufficient to
         reimburse itself for the amount it is required to so withhold.

XIV.     Brokerage Arrangements

                                       7
<PAGE>
 
         The Committee, in its discretion, may enter into arrangements with one
         or more banks, brokers or other financial institutions to facilitate
         the disposition of shares acquired upon exercise of Stock Options,
         including, without limitation, arrangements for the simultaneous
         exercise of Stock Options and sale of the shares acquired upon such
         exercise.

XV.      Nonexclusivity of the Plan

         Neither the adoption of the Plan by the Board nor the submission of the
         Plan to stockholders of the Company for approval shall be construed as
         creating any limitations on the power or authority of the Board to
         adopt such other or additional incentive or other compensation
         arrangements of whatever nature as the Board may deem necessary or
         desirable or preclude or limit the continuation of any other plan,
         practice or arrangement for the payment of compensation or fringe
         benefits to employees generally, or to any class or group of employees,
         which the Company or any Subsidiary now has lawfully put into effect,
         including, without limitation, any retirement, pension, savings and
         stock purchase plan, insurance, death and disability benefits and
         executive short-term incentive plans.

XVI.     Effective Date

         This Plan was adopted by the Board of Directors and became effective on
         July 27, 1990, and was approved by the Company's stockholders on
         November 16, 1990.  No Stock Options shall be granted subsequent to ten
         years after the effective date of the Plan.  Stock Options outstanding
         subsequent to ten years after the effective date of the Plan shall
         continue to be governed by the provisions of the Plan.

                                       8

<PAGE>
 
                                                                     Exhibit 5.1


                               February 23, 1996

EMC Corporation
171 South Street
Hopkinton, Massachusetts 01748


Ladies and Gentlemen:


    I am General Counsel of EMC Corporation, a Massachusetts corporation (the
"Company"), and in such capacity have examined the Company's Registration
Statement on Form S-8 (the "Registration Statement"), being filed with the
Securities and Exchange Commission in connection with the registration under the
Securities Act of 1933, as amended, of the offering of a maximum of 493,400
shares (the "Shares") of the Company's Common Stock, to be issued pursuant to
the McDATA Corporation 1990 Class A Stock Option Plan and the McDATA 1990 Class
B Stock Option Plan (collectively, the "Plans").  I am familiar with the
proceedings undertaken by the Company in connection with the authorization,
reservation and registration of the Shares.  Additionally, I have examined such
questions of law and fact as I have considered necessary or appropriate for
purposes of this opinion.

    Based on the foregoing, I am of the opinion that the Shares have been duly
authorized and, upon issuance, delivery and payment therefor as contemplated by
the Plans, will be validly issued, fully paid and nonassessable.

    I hereby consent to your filing this opinion as an exhibit to the
Registration Statement.
 

                      Very truly yours,

                      /s/ Paul T. Dacier

                      Paul T. Dacier
                      Vice President and General Counsel

<PAGE>
 
                                                                    Exhibit 23.1

                        Consent of Independent Auditors

We consent to the incorporation by reference in this Registration Statement on
Form S-8 pertaining to the registration of 493,400 shares of Common Stock, $0.01
par value, of EMC Corporation authorized for issuance pursuant to the McDATA
1990 Class A Stock Option Plan and the McDATA 1990 Class B Stock Option Plan of
our report dated January 30, 1995, with respect to the consolidated financial
statements and schedules of EMC Corporation included in its Annual Report on
Form 10-K for the year ended December 31, 1994 filed with the Securities and
Exchange Commission.



COOPERS & LYBRAND L.L.P.

Boston, Massachusetts
February 27, 1996


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