<PAGE>
                                                        Exhibit 3.48


                                                     ENDORSED - FILED
                                         IN THE OFFICE OF THE SECRETARY OF STATE
                                                OF THE STATE OF CALIFORNIA

                                                        DEC 13 2002

                                               BILL JONES, SECRETARY OF STATE

                              AMENDED AND RESTATED
                   CERTIFICATE OF DETERMINATION OF PREFERENCES
                                       OF
                            SERIES CC PREFERRED STOCK
                                       OF
                                   DISC, INC.

         We, Robert W. Riland III and Henry Madrid, hereby certify that we are
the President and the Chief Financial Officer, respectively, of DISC, INC., a
corporation organized and existing under the General Corporation Law of the
State of California, and further, DO HEREBY CERTIFY:

         That pursuant to the authority conferred upon the Board of Directors by
the Articles of Incorporation of said Corporation, said Board of Directors on
July 31, 2002 adopted the following resolution adding 5,864 shares of Preferred
Stock designated as Series CC Preferred Stock, (the "Additional Series CC
Preferred") to the 70,988 shares of Series CC Preferred Stock previously
authorized by the Board on June 29, 2001, none of which Additional Series CC
Preferred shares have been issued as of the date hereof:

                  "RESOLVED: That the Board approves of an amendment and
         restatement of the Original Series CC Certificate to increase the
         number of authorized shares of Series CC Preferred Stock, initially
         consisting of 70,988 shares, by 5,864 shares, such that the total
         authorized number of shares shall be 76,852. The designations, powers,
         preferences and relative and other special rights and the
         qualifications, limitations and restrictions of the additional shares
         of Series CC Preferred Stock shall be as set forth in the Original
         Series CC Certificate."

         The Certificate of Determination of Preferences of Series CC Preferred
Stock is hereby amended and restated as follows (all terms used herein which are
defined in the Articles of Incorporation shall be deemed to have the meanings
provided therein):

                  Section 1. Designation and Amount. The shares of such series
         shall be designated as "Series CC Preferred Stock," no par value, and
         the number of shares constituting such series shall be 76,852.

                  Section 2. Dividends and Distributions.

                           (A)      Subject to the prior and superior right of
         the holders of any shares of Series C Preferred Stock ranking prior and
         superior to the shares of Series CC Preferred Stock with respect to
         dividends, and pari passu with the rights of the holders of shares of
         Series D Preferred Stock, Series E Preferred Stock, Series F Preferred
         Stock, Series G Preferred Stock, Series H Preferred Stock, Series I
         Preferred Stock, Series J Preferred Stock, Series K Preferred Stock,
         Series L Preferred Stock, Series M Preferred Stock, Series N Preferred
         Stock, Series O Preferred Stock, Series P Preferred Stock, Series Q
         Preferred Stock, Series R Preferred Stock, Series S Preferred Stock,
         Series T Preferred Stock, Series U Preferred Stock, Series V Preferred
         Stock, Series W Preferred Stock, Series X Preferred Stock, Series Y
         Preferred Stock, Series Z Preferred Stock, Series AA Preferred Stock,
         and Series BB Preferred Stock with respect to dividends, subject to the
         rights of any series of

<PAGE>

         Preferred Stock which may hereafter come into existence, the holders of
         shares of Series CC 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, dividends in the same amount per share as
         declared on the Common Stock, treating such number of shares of Series
         CC Preferred Stock for this purpose as equal to the number of shares of
         Common Stock into which it is then convertible. In the event any
         dividends are declared or paid on the outstanding shares of Series D
         Preferred Stock, Series E Preferred Stock, Series F Preferred Stock,
         Series G Preferred Stock, Series H Preferred Stock, Series I Preferred
         Stock, Series J Preferred Stock, Series K Preferred Stock, Series L
         Preferred Stock, Series M Preferred Stock or Series N Preferred Stock,
         Series O Preferred Stock, Series P Preferred Stock, Series Q Preferred
         Stock, Series R Preferred Stock, Series S Preferred Stock, Series T
         Preferred Stock, Series U Preferred Stock, Series V Preferred Stock,
         Series W Preferred Stock, Series X Preferred Stock, Series Y Preferred
         Stock, Series Z Preferred Stock, Series AA Preferred Stock, and Series
         BB Preferred Stock dividends shall simultaneously be declared and paid
         on the outstanding shares of Series CC Preferred Stock, pari passu with
         the shares of Series D Preferred Stock, Series E Preferred Stock,
         Series F Preferred Stock, Series G Preferred Stock, Series H Preferred
         Stock, Series I Preferred Stock, Series J Preferred Stock, Series K
         Preferred Stock, Series L Preferred Stock, Series M Preferred Stock or
         Series N Preferred Stock, Series O Preferred Stock, Series P Preferred
         Stock, Series Q Preferred Stock, Series R Preferred Stock, Series S
         Preferred Stock, Series T Preferred Stock, Series U Preferred Stock,
         Series V Preferred Stock, Series W Preferred Stock, Series X Preferred
         Stock, Series Y Preferred Stock, Series Z Preferred Stock, and Series
         AA Preferred Stock, and Series BB Preferred Stock based upon the number
         of shares of Common Stock into which shares of Series D Preferred
         Stock, Series E Preferred Stock, Series F Preferred Stock, Series G
         Preferred Stock, Series H Preferred Stock, Series I Preferred Stock,
         Series J Preferred Stock, Series K Preferred Stock, Series L Preferred
         Stock, Series M Preferred Stock, Series N Preferred Stock, Series O
         Preferred Stock, Series P Preferred Stock, Series Q Preferred Stock,
         Series R Preferred Stock, Series S Preferred Stock, Series T Preferred
         Stock, Series U Preferred Stock, Series V Preferred Stock, Series W
         Preferred Stock, Series X Preferred Stock, Series Y Preferred Stock,
         Series Z Preferred Stock, Series AA Preferred Stock, Series BB
         Preferred Stock and Series CC Preferred Stock are then convertible. In
         the event the Corporation shall at any time after the date of the
         filing of this Certificate of Determination of Preferences (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 of Common Stock or other
         consideration to which holders of shares of Series CC Preferred Stock
         were entitled immediately prior to such event under the preceding
         sentence shall be adjusted as set forth in Section 4(C) hereof.

                           (B)      The Corporation shall declare a dividend or
         distribution on the Series CC Preferred Stock as provided in paragraph
         (A) above prior to declaring a dividend payable on shares of Common
         Stock.

                  Section 3. Voting Rights. The holders of shares of Series CC
         Preferred Stock shall have the following voting rights:

                           (A)      Each holder of Series CC Preferred Stock is
         entitled to a number of votes equal to the number of shares of Common
         Stock into which the holder's Series CC

                                        2

<PAGE>

         Preferred Stock is then convertible. Except as provided by law, the
         Common Stock and Series CC Preferred Stock (and any series of Preferred
         Stock which may be subsequently authorized which is convertible into
         shares of Common Stock and which has voting rights equal to the number
         of shares of Common Stock into which such series of Preferred Stock is
         then convertible) shall vote together as a single class on all matters
         to come before the shareholders for approval. 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 number of votes per share to which holders of shares of
         Series CC Preferred Stock were entitled immediately prior to such event
         shall be adjusted as set forth in Section 4(C) hereof.

                           (B)      Except as otherwise provided herein or by
         law, the holders of shares of Series CC Preferred Stock and the holders
         of shares of Common Stock (and any series of Preferred Stock which may
         be subsequently authorized which is convertible into shares of Common
         Stock and which has voting rights equal to the number of shares of
         Common Stock into which such series of Preferred Stock is then
         convertible) shall vote together as one class on all matters submitted
         to a vote of shareholders of the Corporation.

                           (C)      Except as required by law or under Section 8
         hereof, holders of Series CC Preferred Stock shall have no special
         voting rights and their consent shall not be required (except to the
         extent they are entitled to vote with holders of Common Stock as set
         forth herein) for taking any corporate action.

                  Section 4. Conversion Rights.

                           (A)      Each holder of Series CC Preferred Stock
         may, at any time, in such holder's sole discretion, convert all or any
         part of such holder's shares of Series CC Preferred Stock into fully
         paid and nonassessable shares of Common Stock at the rate of ten (10)
         shares of Common Stock for each share of Series CC Preferred Stock
         surrendered for conversion.

                           (B)      Such conversion may be effected by surrender
         of such holder's certificate or certificates for the shares of Series
         CC Preferred Stock to be converted, duly endorsed, at the principal
         office of the Corporation, with a written notice stating (i) that such
         holder elects to convert all or a specified number of shares of Series
         CC Preferred Stock into shares of Common Stock, and (ii) the name in
         which such holder desires a certificate for the shares of Common Stock
         to be issued. Promptly thereafter, the Company shall issue and deliver
         to such holder a certificate for the number of shares of Common Stock
         to which such holder shall be entitled. Such conversion shall be deemed
         to have been made at the close of business on the date of such
         surrender, and such holder shall be treated for all purposes as the
         record holder of such shares of Common Stock on that date.

                           (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 case, the number of
         shares of Common Stock issuable upon the conversion of each share of
         Series CC Preferred Stock

                                        3

<PAGE>

         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 are outstanding immediately prior to
         such event.

                           (D)      In the event the Corporation shall at any
         time or from time to time after the Rights Declaration Date make or
         issue, or fix a record date for the determination of holders of Common
         Stock entitled to receive, a dividend or other distribution payable in
         securities of the Corporation or any of its subsidiaries, or of any
         other corporation or third party, other than in shares of Common Stock,
         then, in each such event, provisions shall be made so that the holders
         of Series CC Preferred Stock shall receive, upon the conversion
         thereof, securities of the Corporation or any of its subsidiaries or of
         any other corporation or third party which they would have received had
         their stock been converted into Common Stock on the date of such event.

                  Section 5. Reacquired Shares. Any shares of Series CC
         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 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.

                  Section 6. Liquidation, Dissolution or Winding Up.

                           (A)      Upon any liquidation (voluntary or
         otherwise), dissolution or winding up of the Corporation, following the
         first priority liquidation preference of the Series C Preferred Stock
         in the amount of $5.00 per share plus any declared but unpaid
         dividends, and pari passu with the liquidation preference of the Series
         D Preferred Stock in the amount of $5.00 per share plus any declared
         but unpaid dividends ("Series D Liquidation Preference"), the
         liquidation preference of the Series E Preferred Stock in the amount of
         $4.00 per share plus any declared but unpaid dividends ("Series E
         Liquidation Preference"), the liquidation preference of the Series F
         Preferred Stock in the amount of $8.00 per share plus any declared but
         unpaid dividends ("Series F Liquidation Preference"), the liquidation
         preference of the Series G Preferred Stock in the amount of $20.00 per
         share plus any declared but unpaid dividends ("Series G Liquidation
         Preference"), the liquidation preference of the Series H Preferred
         Stock in the amount of $38.30 per share plus any declared but unpaid
         dividends ("Series H Liquidation Preference"), the liquidation
         preference of the Series I Preferred Stock in the amount of $4.19 per
         share plus any declared but unpaid dividends ("Series I Liquidation
         Preference"), the liquidation preference of the Series J Preferred
         Stock in the amount of $2.98 per share plus any declared but unpaid
         dividends ("Series J Liquidation Preference"), the liquidation
         preference of the Series K Preferred Stock in the amount of $3.19 per
         share plus any declared but unpaid dividends ("Series K Liquidation
         Preference"), the liquidation preference of the Series L Preferred
         Stock in the amount of $2.76 per share plus any declared but unpaid
         dividends ("Series L Liquidation Preference"), the liquidation
         preference of the Series M Preferred Stock in the amount of $2.23 per
         share plus any declared but unpaid dividends ("Series M Liquidation
         Preference"), the liquidation preference of the Series N Preferred
         Stock in the amount of $.90 per share plus any declared but unpaid
         dividends ("Series N Liquidation Preference"), the liquidation
         preference of the

                                        4

<PAGE>

         Series O Preferred Stock in the amount of $1.06 per share plus any
         declared but unpaid dividends ("Series O Liquidation Preference"), the
         liquidation preference of the Series P Preferred Stock in the amount of
         $8.20 per share plus any declared but unpaid dividends ("Series P
         Liquidation Preference"), the liquidation preference of the Series Q
         Preferred Stock in the amount of $6.20 per share plus any declared but
         unpaid dividends ("Series Q Liquidation Preference"), the liquidation
         preference of the Series R Preferred Stock in the amount of $5.80 share
         plus any declared but unpaid dividends ("Series R Liquidation
         Preference"), the liquidation preference of the Series S Preferred
         Stock in the amount of $3.20 per share plus any declared but unpaid
         dividends ("Series S Liquidation Preference"), the liquidation
         preference of the Series T Preferred Stock in the amount of $20.20 per
         share plus any declared but unpaid dividends ("Series T Liquidation
         Preference"), the liquidation preference of the Series U Preferred
         Stock in the amount of $15.40 per share plus any declared but unpaid
         dividends ("Series U Liquidation Preference"), the liquidation
         preference of the Series V Preferred Stock in the amount of $10.60 per
         share plus any declared but unpaid dividends ("Series V Liquidation
         Preference"), the liquidation preference of the Series W Preferred
         Stock in the amount of $14.90 per share plus any declared but unpaid
         dividends ("Series W Liquidation Preference"), the liquidation
         preference of the Series X Preferred Stock in the amount of $25.00 per
         share plus any declared but unpaid dividends ("Series X Liquidation
         Preference"), the liquidation preference of the Series Y Preferred
         Stock in the amount of $19.10 per share plus any declared but unpaid
         dividends ("Series Y Liquidation Preference"), the liquidation
         preference of the Series Z Preferred Stock in the amount of $21.30 per
         share plus any declared but unpaid dividends ("Series Z Liquidation
         Preference"), the liquidation preference of the Series AA Preferred
         Stock in the amount of $18.10 per share plus any declared but unpaid
         dividends ("Series AA Liquidation Preference"), and t he liquidation
         preference of the Series BB Preferred Stock in the amount of $18.30 per
         share plus any declared but unpaid dividends ("Series BB Liquidation
         Preference"), 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 CC Preferred Stock unless,
         prior thereto, the holders of shares of Series CC Preferred Stock shall
         have received an amount equal to $16.20 per share of Series CC
         Preferred Stock plus any declared but unpaid dividends ("Series CC
         Liquidation Preference").

                           (B)      In the event, however, that there are not
         sufficient assets available to permit payment in full of the Series D
         Liquidation Preference, the Series E Liquidation Preference, the Series
         F Liquidation Preference, the Series G Liquidation Preference, the
         Series H Liquidation Preference, the Series I Liquidation Preference,
         the Series J Liquidation Preference, the Series K Liquidation
         Preference, the Series L Liquidation Preference, the Series M
         Liquidation Preference, the Series N Liquidation Preference, the Series
         O Liquidation Preference, the Series P Liquidation Preference, the
         Series Q Liquidation Preference, the Series R Liquidation Preference,
         the Series S Liquidation Preference, the Series T Liquidation
         Preference, the Series U Liquidation Preference, the Series V
         Liquidation Preference, the Series W Liquidation Preference, the Series
         X Liquidation Preference, the Series Y Liquidation Preference, the
         Series Z Liquidation Preference, the Series AA Liquidation Preference,
         the Series BB Liquidation Preference, and the Series CC Liquidation
         Preference and the liquidation preferences of all other series of
         Preferred Stock, if any, which rank on a parity with the Series CC
         Preferred Stock, then such remaining assets

                                        5

<PAGE>

         shall be distributed ratably to the holders of such parity shares in
         proportion to their respective liquidation preferences.

                  Section 7. No Redemption. The shares of Series CC Preferred
         Stock shall not be redeemable.

                  Section 8. Amendment. The Articles of Incorporation of the
         Corporation shall not be further amended in any manner which would (a)
         alter or change the powers, preferences or special rights or privileges
         of the Series CC Preferred Stock so as to affect them adversely or (b)
         grant to any other class of shares any rights superior to those of the
         Series CC Preferred Stock without the affirmative vote of the holders
         of a majority or more of the outstanding shares of Series CC Preferred
         Stock, voting separately as a class.

                  Section 9. Fractional Shares. Series CC 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 CC Preferred Stock.

                  (remainder of page intentionally left blank)

                                       6

<PAGE>

         The undersigned declare under penalty of perjury that the matters set
forth in the foregoing Certificate are true of their own knowledge.

         Executed at Milpitas, California on December 12, 2002.

                                          /s/ Robert W. Riland III
                                          -------------------------------------
                                          Robert W. Riland III
                                          President and Chief Executive Officer

                                          /s/ Henry Madrid
                                          -------------------------------------
                                          Henry Madrid
                                          Chief Financial Officer

                                                               [SEAL]