1
                                                                     EXHIBIT 4.3


           AMENDED CERTIFICATE OF DESIGNATION, PREFERENCES AND RIGHTS
                OF SERIES A JUNIOR PARTICIPATING PREFERRED STOCK
                                       OF
                           WESTERN DIGITAL CORPORATION


         The undersigned, Charles A. Haggerty, the President of WESTERN DIGITAL
CORPORATION, a Delaware corporation (the "CORPORATION"), does hereby certify
that:

         1. The original Certificate of Designation, Preferences and Rights of
Series A Junior Participating Preferred Stock of the Corporation (the "ORIGINAL
SERIES A CERTIFICATE") was filed with the Delaware Secretary of State on
December 14, 1988.

         2. No shares of Series A Junior Participating Preferred Stock of the
Corporation have been issued.

         3. Pursuant to the authority conferred upon the Board of Directors by
the Amended and Restated Certificate of Incorporation of the Corporation, and
Section 151(g) of the Delaware General Corporation Law, on September 10, 1998,
the Board of Directors adopted the following resolutions amending the Original
Series A Certificate in its entirety, and hereby fixes the relative rights,
preferences and limitations of the Series A Junior Participating Preferred
Stock, par value $0.01, as follows:

                  RESOLVED, that pursuant to Section 151(g) of the Delaware
         General Corporation Law, the Board of Directors hereby acknowledges
         that no shares of Series A Junior Participating Preferred Stock of the
         Corporation have been issued or are outstanding; and

                  RESOLVED, that pursuant to the authority vested in the Board
         of Directors of the Corporation by the Amended and Restated Certificate
         of Incorporation, the Board of Directors hereby amends the Certificate
         of Designation, Preferences and Rights of Series A Junior Participating
         Preferred Stock of the Corporation, filed with the Delaware Secretary
         of State on December 14, 1988, and currently reflected as Article V of
         the Corporation's Amended and Restated Certificate of Incorporation, as
         follows:

                  1. DESIGNATION AND AMOUNT. The shares of such series shall be
         designated as "SERIES A JUNIOR PARTICIPATING PREFERRED STOCK" and the
         number of shares constituting such series shall be 500,000. Such number
         of shares may be increased or decreased by resolution of the Board of
         Directors; provided, that no decrease shall reduce the number of shares
         of Series A Junior Participating Preferred Stock to a number less than
         the number of shares then outstanding plus the number of shares
         reserved for issuance upon the exercise of outstanding options, rights
         or warrants or upon the conversion of any outstanding securities issued
         by the Corporation convertible into Series A Junior Participating
         Preferred Stock.



   2

                  2. DIVIDENDS AND DISTRIBUTIONS.

                  (a) Subject to the prior and superior rights of the holders of
         any shares of any series of Preferred Stock ranking prior and superior
         to the shares of Series A Junior Participating Preferred Stock with
         respect to dividends, the holders of shares of Series A Junior
         Participating Preferred Stock shall be entitled to receive, when, as
         and if declared by the Board of Directors out of funds legally
         available for the purpose, quarterly dividends payable in cash on the
         15th day of January, April, July and October of each year (each a
         "QUARTERLY DIVIDEND PAYMENT DATE"), commencing on the first Quarterly
         Dividend Payment Date after the first issuance of a share or fraction
         of a share of Series A Junior Participating Preferred Stock, in an
         amount per share (rounded to the nearest cent) equal to the greater of
         (a) $0.25 or (b) subject to the provision for adjustment hereinafter
         set forth, 1,000 times the aggregate per share amount of all cash
         dividends, and 1,000 times the aggregate per share amount (payable in
         kind) of all non-cash dividends or other distributions other than a
         dividend payable in shares of Common Stock or a subdivision of the
         outstanding shares of Common Stock (by reclassification or otherwise),
         declared on the common stock, par value $0.01 per share, of the
         Corporation (the "COMMON STOCK") since the immediately preceding
         Quarterly Dividend Payment Date, or, with respect to the first
         Quarterly Dividend Payment Date, since the first issuance of any share
         or fraction of a share of Series A Junior Participating Preferred
         Stock. In the event the Corporation shall at any time after September
         10, 1998 (the "RIGHTS DECLARATION Date") (i) declare any dividend on
         Common Stock payable in shares of Common Stock, (ii) subdivide the
         outstanding Common Stock or (iii) combine the outstanding Common Stock
         into a smaller number of shares, then in each such case the amount to
         which holders of shares of Series A Junior Participating Preferred
         Stock were entitled immediately prior to such event under clause (b) of
         the preceding sentence shall be adjusted by multiplying such amount by
         a fraction, the numerator of which is the number of shares of Common
         Stock outstanding immediately after such event and the denominator of
         which is the number of shares of Common Stock that were outstanding
         immediately prior to such event.

                  (b) The Corporation shall declare a dividend or distribution
         on the Series A Junior Participating Preferred Stock as provided in
         paragraph (a) above as a condition to declaration of a dividend or
         distribution on the Common Stock (other than a dividend payable in
         shares of Common Stock); provided that, in the event that no dividend
         or distribution shall have been declared on the Common Stock during the
         period between any Quarterly Dividend Payment Date, a dividend of $0.25
         per share on the Series A Junior Participating Preferred Stock shall
         nevertheless be payable on such subsequent Quarterly Dividend Payment
         Date.


                                       2


   3

                  (c) Dividends shall begin to accrue and be cumulative on
         outstanding shares of Series A Junior Participating Preferred Stock
         from the Quarterly Dividend Payment Date next preceding the date of
         issue of such shares of Series A Junior Participating Preferred Stock,
         unless the date of issue of such shares is prior to the record date for
         the first Quarterly Dividend Payment Date, in which case dividends on
         such shares shall begin to accrue from the date of issue of such
         shares, or unless the date of issue is a Quarterly Dividend Payment
         Date or is a date after the record date for the determination of
         holders of shares of Series A Junior Participating Preferred Stock
         entitled to receive a quarterly dividend and before such Quarterly
         Dividend Payment Date, in either of which events such dividends shall
         begin to accrue and be cumulative from such Quarterly Dividend Payment
         Date. Accrued but unpaid dividends shall not bear interest. Dividends
         paid on the shares of Series A Junior Participating Preferred Stock in
         an amount less than the total amount of such dividends at the time
         accrued and payable on such shares shall be allocated pro rata on a
         share-by-share basis among all such shares at the time outstanding. The
         Board of Directors may fix a record date for the determination of
         holders of shares of Series A Junior Participating Preferred Stock
         entitled to receive payment of a dividend or distribution declared
         thereon, which record date shall be no more than 30 days prior to the
         date fixed for the payment thereof.

                  3. VOTING RIGHTS. The holders of shares of Series A Junior
         Participating Preferred Stock shall have the following voting rights:

                  (a) Subject to the provision for adjustment hereinafter set
         forth, each share of Series A Junior Participating Preferred Stock
         shall entitle the holder thereof to 1,000 votes on all matters
         submitted to a vote of the stockholders of the Corporation. In the
         event the Corporation shall at any time after the Rights Declaration
         Date (i) declare any dividend on Common Stock payable in shares of
         Common Stock, (ii) subdivide the outstanding Common Stock, or (iii)
         combine the outstanding Common Stock into a smaller number of shares,
         then in each case the number of votes per share to which holders of
         shares of Series A Junior Participating Preferred Stock were entitled
         immediately prior to such event shall be adjusted by multiplying such
         number by a fraction, the numerator of which is the number of shares of
         Common Stock outstanding immediately after such event and the
         denominator of which is the number of shares of Common Stock that were
         outstanding immediately prior to such event.

                  (b) Except as otherwise provided herein or by law, holders of
         Series A Junior Participating Preferred Stock shall have no special
         voting rights and the holders of shares of Series A Junior
         Participating Preferred Stock and the holders of shares of Common Stock
         shall vote together as one class on all matters submitted to a vote of
         stockholders of the Corporation.

                                       3

   4

                  4. CERTAIN RESTRICTIONS.

                  (a) Whenever quarterly dividends or other dividends or
         distributions payable on the Series A Junior Participating Preferred
         Stock as provided in Section 2 are in arrears, thereafter and until all
         accrued and unpaid dividends and distributions, whether or not
         declared, on shares of Series A Junior Participating Preferred Stock
         outstanding shall have been paid in full, the Corporation shall not:

                      (i) declare or pay dividends on, make any other
         distribution on, or redeem or purchase or otherwise acquire for
         consideration any shares of stock ranking junior (either as to
         dividends or upon liquidation, dissolution or winding up) to the Series
         A Junior Participating Preferred Stock;

                      (ii) declare or pay dividends on or make any other
         distributions on any shares of stock ranking on a parity (either as to
         dividends or upon liquidation, dissolution or winding up) with the
         Series A Junior Participating Preferred Stock, except dividends paid
         ratably on the Series A Junior Participating Preferred Stock and all
         such parity stock on which dividends are payable or in arrears in
         proportion to the total amounts to which the holders of all such shares
         are then entitled;

                      (iii) redeem or purchase or otherwise acquire for
         consideration any shares of any stock ranking junior (either as to
         dividends or upon liquidation, dissolution or winding up) to the Series
         A Junior Participating Preferred Stock, provided that the Corporation
         may at any time redeem, purchase or otherwise acquire shares of any
         such junior stock in exchange for shares of any stock of the
         Corporation ranking junior (either as to dividends or upon dissolution,
         liquidation or winding up) to the Series A Junior Participating
         Preferred Stock;

                      (iv) redeem or purchase or otherwise acquire for
         consideration any shares of Series A Junior Participating Preferred
         Stock, or any shares of stock ranking on a parity with the Series A
         Junior Participating Preferred Stock, except (i) in exchange for shares
         of any stock of the Corporation ranking junior (either as to dividends
         or upon dissolution, liquidation or winding up) to the Series A Junior
         Participating Preferred Stock, or (ii) in accordance with a purchase
         offer made in writing or by publication (as determined by the Board of
         Directors) to all holders of such shares upon such terms as the Board
         of Directors, after consideration of the respective annual dividend
         rates and other relative rights and preferences of the respective
         series and classes, shall determine in good faith will result in fair
         and equitable treatment among the respective series or classes.

                  (b) The Corporation shall not permit any subsidiary of the
         Corporation to purchase or otherwise acquire for consideration any
         shares of stock of the Corporation unless the Corporation could, under
         paragraph (a) of this Section 4, purchase or otherwise acquire such
         shares at such time and in such manner.


                                       4


   5

                  5. REACQUIRED SHARES. Any shares of Series A Junior
         Participating Preferred Stock purchased or otherwise acquired by the
         Corporation in any manner whatsoever shall be retired and canceled
         promptly after the acquisition thereof. All such shares shall upon
         their cancellation become authorized but unissued shares of Preferred
         Stock and may be reissued as Series A Junior Participating Preferred
         Stock or as part of a new series of Preferred Stock to be created by
         resolution or resolutions of the Board of Directors, subject to the
         conditions and restrictions on issuance set forth herein.

                  6. LIQUIDATION, DISSOLUTION OR WINDING UP.

                  (a) Upon any liquidation (voluntary or otherwise), dissolution
         or winding up of the Corporation, no distribution shall be made to the
         holders of shares of stock ranking junior (either as to dividends or
         upon liquidation, dissolution or winding up) to the Series A Junior
         Participating Preferred Stock unless, prior thereto, the holders of
         shares of Series A Junior Participating Preferred Stock shall have
         received $1,000 per share, plus an amount equal to accrued and unpaid
         dividends and distributions thereon, whether or not declared, to the
         date of such payment (the "SERIES A LIQUIDATION PREFERENCE"). Following
         the payment of the full amount of the Series A Liquidation Preference,
         no additional distributions shall be made to the holders of shares of
         Series A Junior Participating Preferred Stock unless, prior thereto,
         the holders of shares of Common Stock shall have received an amount per
         share (the "COMMON ADJUSTMENT") equal to the quotient obtained by
         dividing (i) the Series A Liquidation Preference by (ii) 1,000 (as
         appropriately adjusted as set forth in subparagraph (c) below to
         reflect such events as stock splits, stock dividends and
         recapitalizations with respect to the Common Stock) (such number in
         clause (ii), the "ADJUSTMENT NUMBER"). Following the payment of the
         full amount of the Series A Liquidation Preference and the Common
         Adjustment in respect of all outstanding shares of Series A Junior
         Participating Preferred Stock and Common Stock, respectively, holders
         of Series A Junior Participating Preferred Stock and holders of shares
         of Common Stock shall receive their ratable and proportionate share of
         remaining assets to be distributed in the ratio of the Adjustment
         Number to one (1) with respect to such Preferred Stock and Common
         Stock, on a per share basis, respectively.

                  (b) In the event, however, that there are not sufficient
         assets available to permit payment in full of the Series A Liquidation
         Preference and the liquidation preferences of all other series of
         Preferred Stock, if any, which rank on a parity with the Series A
         Junior Participating Preferred Stock, then such remaining assets shall
         be distributed ratably to the holders of such parity shares in
         proportion to their respective liquidation preferences. In the event
         that there are not sufficient assets available to permit payment in
         full of the Common Adjustment, then such remaining assets shall be
         distributed ratably to the holders of Common Stock.


                                        5


   6

                  (c) In the event the Corporation shall at any time after the
         Rights Declaration Date (i) declare any dividend on Common Stock
         payable in shares of Common Stock, (ii) subdivide the outstanding
         Common Stock, or (iii) combine the outstanding Common Stock into a
         smaller number of shares, then in each such case the Adjustment Number
         in effect immediately prior to such event shall be adjusted by
         multiplying such Adjustment Number by a fraction, the numerator of
         which is the number of shares of Common Stock outstanding immediately
         after such event and the denominator of which is the number of shares
         of Common Stock that were outstanding immediately prior to such event.

                  7. CONSOLIDATION, MERGER, ETC. In case the Corporation shall
         enter into any consolidation, merger, combination or other transaction
         in which the shares of Common Stock are exchanged for or changed into
         other stock or securities, cash and/or any other property, then in any
         such case the shares of Series A Junior Participating Preferred Stock
         shall at the same time be similarly exchanged or changed in an amount
         per share (subject to the provision for adjustment hereinafter set
         forth) equal to 1,000 times the aggregate amount of stock, securities,
         cash and/or any other property (payable in kind), as the case may be,
         into which or for which each share of Common Stock is changed or
         exchanged. In the event the Corporation shall at any time after the
         Rights Declaration Date (i) declare any dividend on Common Stock
         payable in shares of Common Stock, (ii) subdivide the outstanding
         Common Stock, or (iii) combine the outstanding Common Stock into a
         smaller number of shares, then in each such case the amount set forth
         in the preceding sentence with respect to the exchange or change of
         shares of Series A Junior Participating Preferred Stock shall be
         adjusted by multiplying such amount by a fraction, the numerator of
         which is the number of shares of Common Stock outstanding immediately
         after such event and the denominator of which is the number of shares
         of Common Stock that were outstanding immediately prior to such event.

                  8. NO REDEMPTION. The shares of Series A Junior Participating
         Preferred Stock shall not be redeemable.

                  9. RANKING. The Series A Junior Participating Preferred Stock
         shall rank junior to all other series of the Corporation's preferred
         stock, if any, as to the payment of dividends and the distribution of
         assets, unless the terms of any such series shall provide otherwise.

                  10. AMENDMENT. If there is any Series A Junior Participating
         Preferred Stock outstanding, the Amended and Restated Certificate of
         Incorporation of the Corporation shall not be further amended in any
         manner which would materially alter or change the powers, preferences
         or special rights of the Series A Junior Participating Preferred Stock
         so as to affect them adversely without the affirmative vote of the
         holders of a majority or more of the outstanding shares of Series A
         Junior Participating Preferred Stock, voting separately as a class.


                                       6

   7

                  11. FRACTIONAL SHARES. Series A Junior Participating Preferred
         Stock may be issued in fractions of a share, which shall entitle the
         holder, in proportion to such holder's fractional shares, to exercise
         voting rights, receive dividends, participate in distributions and to
         have the benefit of all other rights of holders of Series A Junior
         Participating Preferred Stock.

                  RESOLVED FURTHER, that the Chief Executive Officer, the
         President or any Vice President and the Secretary or any Assistant
         Secretary of the Corporation be, and they hereby are, authorized and
         directed to prepare and file an Amended Certificate of Designation,
         Preferences and Rights in accordance with the foregoing resolution and
         the provisions of Delaware law and to take such actions as they may
         deem necessary or appropriate to carry out the intent of the foregoing
         resolution."

         IN WITNESS WHEREOF, this Amended Certificate of Designation is executed
on November 25, 1998.


                                            WESTERN DIGITAL CORPORATION,
                                            a Delaware corporation


                                            By: /s/ Charles A. Haggerty
                                                --------------------------------
                                                Charles A. Haggerty
                                                Chairman of the Board, President
                                                and Chief Executive Officer



                                       7