QUANTUM ANNOUNCES FISCAL FOURTH QUARTER EARNINGS CONFERENCE CALL

SAN JOSE, Calif., April 21, 2005 -- Quantum Corp. (NYSE:DSS), a global leader in storage, will release earnings for the fourth quarter of fiscal 2005, ended March 31, 2005, on Tuesday, May 10, 2005, after the close of the market.  Shortly after the news release is issued, Quantum will hold a conference call at 2 p.m. PDT.

Conference Call:
Tuesday, May 10, 2005, 2 p.m. PDT

Dial-in Number:
(303) 262-2142 (US & International)

Replay Numbers:
(800) 405-2236 (US)
(303) 590-3000 (International)
Access Code:   11029158
Replay Expiration:  Tuesday, May 17, 2005

Audio Webcast:
Quantum will provide a live audio webcast of the fourth quarter earnings conference call on Tuesday, May 10, at 2 p.m. PDT.  In addition, an archived webcast will be available for one year.

Webcast Site: 
http://investors.quantum.com

About Quantum
Quantum Corp. (NYSE:DSS), a global leader in storage, delivers highly reliable backup, recovery and archive solutions that meet demanding requirements for data integrity and availability with superior price/performance and comprehensive service and support.  Quantum offers customers of all sizes an unparalleled range of solutions, from leading tape drive and media technologies, autoloaders and libraries to disk-based backup systems.  Quantum is the world's largest volume supplier of both tape drives and tape automation and has pioneered the development of disk-based systems optimized for backup and recovery.  Quantum Corp., 1650 Technology Drive, Suite 800, San Jose, CA 95110, (408) 944-4000, www.quantum.com.