Document:

<PAGE>

                                                                   EXHIBIT 10.32

               AMENDMENT TO COMMON R&D AND PARTICIPATION AGREEMENT

     THIS AMENDMENT (the "Amendment") to the Common R&D and Participation
Agreement (the "Agreement"), dated as of May 9, 2000 by and between Toshiba
Corporation, a Japanese corporation with a principal place of business at 1-1,
Shibaura 1-chome, Minato-ku, Tokyo 105-8001, Japan, (hereinafter "Toshiba"), and
SanDisk Corporation, a Delaware corporation with a principal place of business
at 140 Caspian Court, Sunnyvale, CA 94089, U. S. A. (hereinafter "SanDisk"), is
dated and effective as of April 10, 2002.

                                   WITNESSETH
                                   ----------

     WHEREAS, Toshiba and SanDisk have entered into a New Master Agreement dated
as of April 10, 2002;

     WHEREAS, Toshiba and SanDisk desire to amend the Agreement in order to make
it consistent with the foregoing and the terms and conditions of the New Master
Agreement.

     NOW THEREFORE, in consideration of the premises and of the mutual promises
herein contained, the parties hereto agree as follows:

                                    AGREEMENT
                                    ---------

     1.  Amendment to Section 5.1(i). Section 5.1(i) of the Agreement is hereby
deleted in its entirety and the following is substituted in lieu thereof:

          "From the second quarter of the calendar year 2000 through and
     including March 31, 2002:

          SanDisk will share in Toshiba's Common R&D expenditures as set forth
          in Table A below, and SanDisk shall pay Toshiba for such Common R&D
          expenditures in the amounts and on or prior to the dates provided in
          Table B as follows:

<TABLE>
<CAPTION>
----------------------------------------------------------------------------------------------------------------------
                                                       Table A
----------------------------------------------------------------------------------------------------------------------
                                     SanDisk's Allocation of Common R&D Expenses
----------------------------------------------------------------------------------------------------------------------
                    2000                                                2001                                 2002
----------------------------------------------------------------------------------------------------------------------
      2Q              3Q             4Q            1Q             2Q            3Q             4Q             1Q
----------------------------------------------------------------------------------------------------------------------
                                        (amounts incurred in millions of Yen)
----------------------------------------------------------------------------------------------------------------------
<S>                  <C>           <C>            <C>           <C>            <C>            <C>           <C>
     [***]           [***]         [***]          [***]         [***]          [***]          [***]         [***]
----------------------------------------------------------------------------------------------------------------------
</TABLE>

CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY WITH
THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT TO THE
OMITTED PORTIONS.

[***] INDICATES THAT CERTAIN INFORMATION ON THIS PAGE HAS BEEN OMITTED AND FILED
      SEPARATELY WITH THE COMMISSION PURSUANT TO RULE 24B-2. CONFIDENTIAL
      TREATMENT HAS BEEN REQUESTED WITH RESPECT TO THE OMITTED PORTIONS.

<PAGE>
<TABLE>
<CAPTION>
----------------------------------------------------------------------------------------------------------------------
                                                       Table B
----------------------------------------------------------------------------------------------------------------------
                                     Payment by SanDisk for Common R&D Expenses
----------------------------------------------------------------------------------------------------------------------
                                          2002                                                       Total
----------------------------------------------------------------------------------------------------------------------
           June 30                     September 30                  December 31
----------------------------------------------------------------------------------------------------------------------
                                        (amounts payable in millions of Yen)
----------------------------------------------------------------------------------------------------------------------
<S>         <C>                            <C>                          <C>                          <C>
            [***]                          [***]                        [***]                        [***]
----------------------------------------------------------------------------------------------------------------------
</TABLE>

     Notwithstanding the foregoing, in the event of the termination of this
Agreement after the Effective Date but prior to December 31, 2002, SanDisk shall
be obligated immediately to pay any unpaid amount set forth in Table B.

     2.  Amendment to Sections 5.1(ii) and (iii). Sections 5.1(ii) and (iii) of
the Agreement are hereby deleted in their entirety and the following is
substituted in lieu thereof:

     "(ii) After March 31, 2002:

     The parties acknowledge that after March 31, 2002, it will be difficult to
     predetermine Toshiba's total Common R&D expenditures and a fixed allocation
     of Common R&D expenditures for SanDisk. Therefore, after March 31, 2002,
     the payment by SanDisk to Toshiba for Common R&D expenditures will be based
     on a percentage of SanDisk's Net Sales (as hereinafter defined), and
     calculated and paid as follows:

     Within thirty days of the end of each calendar quarter based on SanDisk's
     Net Sales of NAND Flash Memory Products for the quarter just ended as
     follows:

         From April 1, 2002 to December 31, 2002

           (a)  [***] of the first US $ 100 million for the quarter reported;

           (b)  [***] of the next US $ 100 million for the quarter reported; and

           (c)  [***] of net sales in excess of US $ 200 million per quarter.

     For the purpose of this Article, "Net Sales" shall mean the invoice price
     for NAND Flash Memory Products billed by SanDisk.

          (iii) Notwithstanding (ii) above, SanDisk's quarterly contribution for
     Common R&D pursuant to (i) and (ii) above shall not exceed the sum of (a)
     [***] of the total Common R&D annual expenditure of the Semiconductor
     Company of Toshiba, as notified to SanDisk by Toshiba at the beginning of
     each of Toshiba fiscal year ("Total R&D Budget") for the first [***] of the
     Total R&D Budget and (b) [***] of the portion of such Total R&D Budget in
     excess of [***]."

     3.  Pricing for 2003 and Beyond. For 2003 and beyond, SanDisk's quarterly
common R&D payments shall be agreed upon by the parties and will be based on
certain percentages of SanDisk's Net Sales (as defined in the Agreement) and
calculated in a manner

[***] INDICATES THAT CERTAIN INFORMATION ON THIS PAGE HAS BEEN OMITTED AND FILED
      SEPARATELY WITH THE COMMISSION PURSUANT TO RULE 24B-2. CONFIDENTIAL
      TREATMENT HAS BEEN REQUESTED WITH RESPECT TO THE OMITTED PORTIONS.

<PAGE>

consistent with Section 5.1(ii) of the Agreement, provided that the percentages
used in such calculation shall not exceed (a) the percentages of the applicable
SanDisk Net Sales amount set forth in Section 5.1(ii) of the Agreement, as
amended herein and (b) the applicable percentages of the Total R&D Budget set
forth in Section 5.1(iii) of the Agreement, as amended herein.

     4.  Effect of this Amendment. Except as specifically amended hereby, the
Agreement shall remain in full force and effect as in existence on the date
hereof and is hereby ratified and confirmed in all respects.

     5.  Governing Law. This Amendment shall be governed by and construed in
accordance with the Governing Law provision incorporated by reference into the
Agreement.

     6.  Counterparts. This Amendment may be executed in any number of
counterparts which together shall constitute one and the same instrument.

                  [Remainder of Page Intentionally Left Blank]

<PAGE>

     IN WITNESS WHEREOF, the parties have executed this Amendment as of the date
and year first above written.

                                    TOSHIBA CORPORATION

                                    By: /s/ Takeshi Nakagawa
                                        ----------------------------------------
                                    Name:  Takeshi Nakagawa
                                    Title:  Corporate Senior Vice President
                                            President & CEO
                                            Semiconductor Company

                                    SANDISK CORPORATION

                                    By: /s/ Eli Harari
                                        ----------------------------------------
                                    Name:  Eli Harari
                                    Title:  President & Chief Executive Officer

                         [Signature Page to Amendment to
                             Common R&D Agreement]<PAGE>

                                                                   EXHIBIT 10.33

                   AMENDMENT TO PRODUCT DEVELOPMENT AGREEMENT

     THIS AMENDMENT (the "Amendment") to the Product Development Agreement (the
"Agreement"), dated as of May 9, 2000 by and between Toshiba Corporation, a
Japanese corporation with a principal place of business at 1-1, Shibaura
1-chome, Minato-ku, Tokyo 105-8001, Japan, (hereinafter "Toshiba"), and SanDisk
Corporation, a Delaware corporation with a principal place of business at 140
Caspian Court, Sunnyvale, CA 94089, U. S. A. (hereinafter "SanDisk"), is dated
and effective as of April 10, 2002.

                               W I T N E S S E T H
                               - - - - - - - - - -

     WHEREAS, Toshiba and SanDisk have entered into a New Master Agreement dated
as of April 10, 2002;

     WHEREAS, Toshiba and SanDisk desire to amend the Agreement in order to make
it consistent with the terms and conditions of the New Master Agreement.

     NOW THEREFORE, in consideration of the premises and of the mutual promises
herein contained, the parties hereto agree as follows:

                                A G R E E M E N T
                                - - - - - - - - -

     1. Amendment to Exhibit B to the Agreement. Exhibit B to the Agreement is
        ---------------------------------------
hereby deleted in its entirety and the Exhibit B attached hereto is substituted
in lieu thereof.

     2. Information Exchange. Each of Toshiba and SanDisk agree to provide to
        --------------------
the other party certain information relating to product development, including
without limitation, the information set forth on Exhibit D attached hereto.

     3. Governing Law. This Amendment shall be governed by and construed in
        -------------
accordance with the Governing Law provision incorporated by reference into the
Agreement.

     4. Effect of this Amendment. Except as specifically amended hereby, the
        ------------------------
Agreement shall remain in full force and effect as in existence on the date
hereof and is hereby ratified and confirmed in all respects.

     5. Counterparts. This Amendment may be executed in any number of
        ------------
counterparts which together shall constitute one and the same instrument.

                  [Remainder of Page Intentionally Left Blank]

CERTAIN INFORMATION IN THIS EXHIBIT HAS BEEN OMITTED AND FILED SEPARATELY WITH
THE COMMISSION. CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT TO THE
OMITTED PORTIONS.

<PAGE>

     IN WITNESS WHEREOF, the parties have executed this Amendment as of the date
and year first above written.

                                    TOSHIBA CORPORATION

                                    By: /s/ Takeshi Nakagawa
                                        ----------------------------------------
                                    Name:  Takeshi Nakagawa
                                    Title:  Corporate Senior Vice President
                                            President & CEO
                                            Semiconductor Company

                                    SANDISK CORPORATION

                                    By: /s/ Eli Harari
                                        ----------------------------------------
                                    Name:  Eli Harari
                                    Title:  President & Chief Executive Officer

                         [Signature Page to Amendment to
                         Product Development Agreement]

<PAGE>

                                    Exhibit B
                                    ---------

                       SHARING OF WAFER PROCESSING COSTS -
       (For Jointly Developed Products and Jointly Developed Controllers)
       ------------------------------------------------------------------

                           Jointly Developed Products
                           --------------------------

                                   SanDisk                    Toshiba
                                   -------                    -------
(1) 1H/2000                        [***]                      [***]

(2) 2H/2000                        [***]                      [***]

(3) 1H/2001                        [***]                      [***]

(4) 2H/2001                        [***]                      [***]

(5) 1Q/2002                        [***]                      [***]

(6) 2Q/2002                        [***]                      [***]

(7) 3Q/2002                        [***]                      [***]

(8) 4Q/2002                        [***]                      [***]

(9) 1Q/2003 and beyond             [***]

                          Jointly Developed Controllers
                          -----------------------------

(1) Wafer processing cost associated with Jointly Developed Controllers will be
shared by the parties as determined by the Coordinating Committee in accordance
with Article 3.2.

Note 1: All costs charged pursuant to this Exhibit B are direct costs and have
been referred to by the parties as Direct R&D charges. Original back-up
information and financial detail of all such charges shall be made available to
the party paying the shared expense, and all such charges are subject to
financial audit by the external auditors of the party paying the charge. The
party receiving payment shall cooperate with all reasonable requests to view and
make copies of financial back-up and financial detail material associated with
the charges.

Note 2: Payments specified above shall be made within sixty (60) days after
receipt of invoice issued at the end of each calendar half year.

[***] INDICATES THAT CERTAIN INFORMATION ON THIS PAGE HAS BEEN OMITTED AND FILED
      SEPARATELY WITH THE COMMISSION PURSUANT TO RULE 24B-2. CONFIDENTIAL
      TREATMENT HAS BEEN REQUESTED WITH RESPECT TO THE OMITTED PORTIONS.

<PAGE>

                                    Exhibit D
                                    ---------

                              Information Exchange

<TABLE>
<CAPTION>
-------------------------------------------------------------------------------------------------------------------
Name of Report / Data                  Description                                Frequency
-------------------------------------------------------------------------------------------------------------------
<S>                                    <C>                                        <C>
17. Status of new technology           Details of each new product                Monthly - by the 15th day of next
qualification and production schedule                                             month
-------------------------------------------------------------------------------------------------------------------
18. Design rule documentation          Description of design rules                Whenever change is made
-------------------------------------------------------------------------------------------------------------------
19. DRC / LVS runset                   DRC/LVS runset file and version control    Whenever change is made
-------------------------------------------------------------------------------------------------------------------
20. Database of product                OPUS data base for each product            After tapeout
-------------------------------------------------------------------------------------------------------------------
21. Feature set change or new          New function and specification             Making decision jointly  Document
features                                                                          sent after finalized
-------------------------------------------------------------------------------------------------------------------
22. Design review document             Description of specification, circuit      Before tapeout
                                       review and design rule
-------------------------------------------------------------------------------------------------------------------
23. Characterization report (product   AC/DC characteristics                      At release of new product or
level)                                 Reliability and qualification report       release of product change
-------------------------------------------------------------------------------------------------------------------
24. Simulation models                  SPICE model                                Beginning of circuit design cycles
-------------------------------------------------------------------------------------------------------------------
25. Transistor characteristics and     Specification for each device,             Beginning of circuit design cycles
detailed device information            Transistor measurement data,
                                       Measurement data of each device
-------------------------------------------------------------------------------------------------------------------
26. Design change / revision history   Description of data base revision with     Document due after each design
                                       design change information                  change
-------------------------------------------------------------------------------------------------------------------
27. Preliminary information of new     Device Target specification                At the time new technology
technology                                                                        development begins
-------------------------------------------------------------------------------------------------------------------
28. Process cross-section              Cross-sectional view                       At the time of process change and
                                                                                  technology
-------------------------------------------------------------------------------------------------------------------
29. Process flow                       Current POR                                At the time of process change and
                                                                                  technology
-------------------------------------------------------------------------------------------------------------------
</TABLE>

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