Exhibit 99.1

CERTIFICATION OF CHIEF EXECUTIVE OFFICER

PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

I, Eli Harari, Chief Executive Officer of SanDisk Corporation, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that the Quarterly Report of SanDisk Corporation on Form 10-Q for the quarterly period ended June 30, 2002 (the “Report”) fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934 and that the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of SanDisk Corporation.

By: /s/    ELI HARARI

Eli Harari

Chief Executive Officer

August 13, 2002

CERTIFICATION OF VICE PRESIDENT, FINANCE (PRINCIPAL FINANCIAL OFFICER)

PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

I, Michael Gray, Vice President, Finance (Principal Financial Officer) of SanDisk Corporation, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that the Quarterly Report of SanDisk Corporation on Form 10-Q for the quarterly period ended June 30, 2002 (the “Report”) fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934 and that the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of SanDisk Corporation.

By: /s/    MICHAEL GRAY

Michael Gray

Vice President, Finance (Principal Financial Officer)

August 13, 2002