X0202 4 2004-07-21 0 0000709283 QUANTUM CORP /DE/ DSS 0001204921 GANNON JOHN B C/O QUANTUM CORPORATION 1650 TECHNOLOGY DRIVE, SUITE 800 SAN JOSE CA 95110 0 1 0 0 President & COO Common Stock 2004-07-21 4 A 0 9950 0.01 A 94889 D Grant of restricted stock under Rule 16b-3. The vesting of the restricted stock will be 100% vesting on April 1, 2005. /s/ Rita Larsen, by Rita Larsen, Attorney in Fact for John B. Gannon 2004-07-22