Exhibit
32.1
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, Richard E.
Belluzzo, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to
Section 906 of the Sarbanes-Oxley Act of 2002, that the Annual Report of Quantum
Corporation, on Form 10-K for the year ended March 31, 2010 fully complies with
the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of
1934, as amended, and that information contained in such Annual Report on Form
10-K fairly presents in all material respects the financial condition and
results of operations of Quantum Corporation.
Date: June 11,
2010
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QUANTUM CORPORATION |
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/s/ RICHARD E.
BELLUZZO |
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Richard E. Belluzzo |
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Chairman and Chief Executive
Officer |