DATA STORAGE NEWS

QUANTUM'S DX-SERIES DEMONSTRATES MARKET LEADERSHIP IN GROWING VIRTUAL
TAPE CATEGORY OF DISK-BASED BACKUP

Company Sees Expanded Sales in Large Enterprise, Government, and Finance

SAN JOSE, Calif., Nov. 30, 2004 -- Quantum Corp. (NYSE:DSS), a global
leader in storage, today announced unit sales of its DX-Series
Disk-based Backup Systems have nearly doubled over the first three
quarters of this calendar year compared to the previous year. The
company also recently announced its third calendar quarter results in
which it significantly increased its DX-Series worldwide unit volume
and shipped the highest number of virtual tape systems in a single
quarter to-date.

Quantum established the virtual tape category for the open systems
market with the introduction of the DX30 in 2002 and followed with its
second generation enterprise-class DX100 system in 2003. The company
has been steadfast in its strategic approach of delivering highly
reliable disk-based virtual tape systems that easily integrate with
customers' existing infrastructure, add much improved backup and
restore performance, and maintain the integrity of data throughout the
backup, recovery and archive process.

"ESG believes that Quantum is demonstrating a leadership position in
the quickly growing virtual tape library category," said Tony Asaro,
senior analyst for Enterprise Strategy Group (ESG). "Quantum largely
established the virtual tape market for open systems and is delivering
a mature family of disk-based systems that offer increased backup and
restore performance, and reliability to its customers. Additionally,
Quantum has an excellent customer services reputation and the
resources to support the most demanding environments."

Data compiled from the company's DX-Series customer base shows
approximately 70 percent of DX30 and DX100 shipments are to newly
established Quantum Storage Systems customers and that over 40 percent
of sales are within the government (federal, state and local) and
financial services market segments. In total, this data further
validates the growing adoption of Quantum's DX-Series and the benefits
of the company's approach to virtual tape technology, especially with
larger enterprise customers and in key vertical markets.

Recent DX-Series sales in the federal government market include those
to agencies within the Department of Defense, such as a cluster of Air
Force bases and Army installations, as well as additional federal
agencies. Among Quantum's state and local government customers are a
state department of education and state housing and community
development agency. In the financial services market, sales of
DX-Series include those to one of the world's leading financial and
wealth management institutions, a six-billion dollar financial
subsidiary of a leading U.S. insurance company and a host of savings
and loan corporations and branches.

Supported by every major backup software vendor, Quantum's DX-Series
works in concert with customers' established processes and seamlessly
integrates with the backup package for the entire migration of data
through backup, restore and archive. Other virtual tape vendors often
introduce proprietary software into the environment which can
interrupt existing data migration processes and lead to access
problems when a user seeks to restore archived data.

"Quantum's DX-Series continues to be very well received by enterprise
customers because it is easy to implement and enables extremely fast
and reliable backup and recovery," said Rob Pickell, vice president of
worldwide marketing for Quantum's Storage Systems Business Unit.
"Virtual tape technology has expanded Quantum's total market reach and
supports our role as a strategic advisor for backup, recovery and
archive solutions to enterprise customers around the world."

DX-Series is optimized for extremely fast and reliable backup and
restore operations and offers redundant and hot-swappable components
that deliver up to 64 terabytes (TB) of raw capacity and performance
up to 2 TB/hour. The DX-Series dramatically improves backup and
restore performance and reliability, and Quantum customers enjoy an
average increase of 200 percent in backup performance and 400 percent
in restore performance. In addition, nearly every user indicates 100
percent restore reliability with DX-Series over their previous
environment.(1) The DX-Series easily integrates with any open systems
physical tape library or tape drive and no special configuration or
setup is required. The DX-Series complements tape libraries by
allowing them to focus on archive operations.

About Quantum
Quantum Corp. (NYSE:DSS), founded in 1980, is a global leader in
storage, delivering 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 is the world's largest supplier of half-inch
cartridge tape drives, and its DLTtape® technology is the standard for
tape backup, recovery and archive of business-critical data for the
mid-range enterprise. Quantum offers the broadest portfolio of tape
autoloaders and libraries and is one of the pioneers in the disk-based
backup market, providing solutions that emulate a tape library but are
optimized for backup and recovery. Quantum sales for the fiscal year
ended March 31, 2004, were approximately $808 million. Quantum Corp.,
1650 Technology Drive, Suite 800, San Jose, CA 95110, (408) 944-4000,
www.quantum.com.

1 Field Adoption Report: Disk-based Backup and Restore, the Quantum
DX-Series. Taneja Group, May 2004.

###

Quantum, the Quantum logo, DLT and DLTtape are trademarks of Quantum
Corporation registered in the United States and other countries. All
other trademarks are the property of their respective owners.

"Safe Harbor" Statement under the U.S. Private Securities Litigation
Reform Act of 1995: This press release contains "forward-looking"
statements within the meaning of the Private Securities Litigation
Reform Act of 1995. These forward-looking statements include our
statements regarding 1) future sales of our DX-Series products and
benefits for Quantum from such sales and 2) benefits for our customers
from using the DX-Series products. These statements are based on
management's current expectations and are subject to certain risks and
uncertainties. As a result, actual results may differ materially from
the forward-looking statements contained herein. Factors that could
cause actual results to differ materially from those described herein
include, but are not limited to, operational difficulties, unforeseen
technological limitations, unanticipated changes in customers' needs
or requirements, the ability of competitors to compete more
successfully with us, changes in market conditions and in the role of
tape, the economic environment of the storage and information systems
industry and the general economic environment. More detailed
information about risk factors and uncertainties relating to Quantum's
business generally, including risk factors and uncertainties in
addition to those described above, are set forth in Quantum's periodic
filings with the Securities and Exchange Commission (the "SEC"),
including, but not limited to, those described in the section entitled
"Management's Discussion and Analysis of Financial Condition and
Results of Operations -- Risk Factors," on pages 35 to 46 in our
Quarterly Report on Form 10-Q filed with the SEC on November 3, 2004
and on pages 38 to 48 in our Annual Report on Form 10-K filed with the
SEC on June 14, 2004; and those described in any subsequently filed
reports. Such reports contain and identify important factors that
could cause actual events and results to differ materially from those
contained in our projections or forward-looking statement.
Quantum expressly disclaims any obligation to update or alter its
forward-looking statements, whether as a result of new information,
future events or otherwise.