Exhibit 99.3

Certification Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to

Section 906 of the Sarbanes-Oxley Act of 2002

      Each of the undersigned, the Chief Executive Officer and Chief Financial Officer of QLogic Corporation (the “Company”), hereby certifies, pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, 18 U.S.C. Section 1350, that:

      (1) the Quarterly Report on Form 10-Q of the Company for the quarterly period ended June 29, 2003 (the “Report”) fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 (15 U.S.C. 78m or 780(d)); 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/ H.K DESAI

H.K. Desai

Chief Executive Officer

/s/ FRANK A. CALDERONI

Frank A. Calderoni

Chief Financial Officer

Dated: August 7, 2003

      The foregoing certification is being furnished to the Securities and Exchange Commission pursuant to the 18 U.S.C Section 1350. It is not being filed for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, and it is not to be incorporated by reference into any filing of the Company, whether made before or after the date hereof, regardless of any general incorporation language in such filing. A signed original of this written statement required by Section 906 has been provided to the Company and will be retained by the Company and furnished to the Securities and Exchange Commission or its staff upon request.