Exhibit 99-B

Certification of Chief Executive Officer

Pursuant to

U.S.C. Section 1350,

as Adopted Pursuant to

Section 906 of The Sarbanes-Oxley Act of 2002

I, Steven A. Raymund, Chairman of the Board of Directors and Chief Executive Officer of Tech Data Corporation, do hereby certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to my knowledge:

(i) the Quarterly Report on Form 10-Q of the Company for the quarterly period ended October 31, 2002, (the “Report”) fully complies with the requirements of Section 13(a) or Section 15(d), as applicable, of the Securities Exchange Act of 1934, as amended; and

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

Dated: December 10, 2002

/s/    Steven A. Raymund         

Steven A. Raymund

Chairman of the Board of Directors and

Chief Executive Officer