Exhibit 99.1

                            CERTIFICATION PURSUANT TO
                             18 U.S.C. SECTION 1350
                             AS ADOPTED PURSUANT TO
                  SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

     I, Joseph M. Tucci, President and Chief Executive Officer of EMC
Corporation (the "Company"), certify, pursuant to 18 U.S.C. Section 1350, as
adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

     (1)  The Company's Annual Report on Form 10-K for the fiscal year ended
          December 31, 2002, as filed with the Securities and Exchange
          Commission on March 18, 2003 (the "Report"), fully complies with the
          requirements of Section 13(a) or 15(d) of the Securities Exchange Act
          of 1934; and

     (2)  The information contained in the Report fairly presents, in all
          material respects, the financial condition and results of operations
          of the Company.

                                           /s/ Joseph M. Tucci
                                           -------------------------------------
                                           Joseph M. Tucci
                                           President and Chief Executive Officer

                                           March 18, 2003














This certification accompanies this Report pursuant to Section 906 of the
Sarbanes-Oxley Act of 2002 and shall not be deemed filed by the Company for
purposes of Section 18 of the Securities Exchange Act of 1934, as amended.