Press Release

QUANTUM SETS A NEW PACE IN THE HIGH-END DISK DRIVE MARKET - INTRODUCES INDUSTRY'S FASTEST 10,000 RPM DISK DRIVES

New Atlas 10K II Drives Offer Best-in-class Performance with Highest Available Areal Density for High Performance Workstations, Enterprise Servers, and Storage Subsystems

MILPITAS, Calif., December 15, 1999 - Quantum Corporation's Hard Disk Drive Group (NYSE:HDD) today announced its Atlas™ 10K II - the industry's highest density 10,000 RPM disk drive. At 4.7ms seek time and 73.4GB capacity, the Atlas 10K II family nearly doubles the available capacity and improves performance by 10-15 percent over Quantum's previous 10,000 RPM generation. The Atlas 10K II drive is the optimum choice for Windows NT or UNIX enterprise and departmental servers, as well as high-performance workstations running 2-D graphics, 3-D video, and other high I/O applications.

"The Atlas 10K II is an industry leader in areal density - this allows for fewer heads and platters contributing to the overall improved reliability and performance, which in turn results in savings for the end user," said Brendan Collins, program marketing manager for the Atlas 10K II product. "Our partnering OEMs demand solutions that give them the competitive advantage. We believe the Atlas 10K II does just that."

"The Atlas line of products has been recognized for best in class performance - for instance, Atlas 10K II's predecessor, the Atlas 10K won Storage Review's Editors' Choice Award this year. The drive was compared against the same class of drives from IBM, Seagate, Western Digital, and Fujitsu. Quantum continues to lead the field by combining huge storage capacity, fast performance, and solid reliability in the new Atlas 10K II," said Clark Foy, vice president of marketing for Quantum's high-end storage division.

Quantum continues to offer today's demanding server environments with exceptional performance and reliability with its Atlas 10K II.

• Fast seek time (4.7 ms) coupled with a sustained data throughput rate of 40 MB/s and an 8 MB cache buffer
• Highest areal density in a 10,000 RPM drive - 7.7Gb per square inch
• Available in 9.2GB, 18.4GB, 36.7GB, and now 73.4GB capacities
• Quiet drive technology makes the Atlas 10K II the optimal choice for any workstation environment
• Additional Ultra160 SCSI features: Asynchronous Information Protection (AIP) and fairness provide added data reliability and increased overall system performance
• Proven Data Protection System confirms functionality quickly and easily to eliminate unnecessary drive returns
• Shock Protection System II guards against damage during handling and integration for added reliability
• Fully-automated volume manufacturing delivers consistently high quality

Quantum's Atlas 10K II Offers an Outstanding Value Proposition
Atlas 10K II is the fastest available drive - this unmatched speed is combined with leading-edge technology to guarantee optimal reliability and performance.

The Atlas 10K II drive incorporates active bus, hot pluggable design, domain validation for automated bus management, and the latest in interface technologies - SCSI and Fibre Channel (FC-AL2) for maximum bandwidth and connectivity. The Atlas product line also offers the industry's first backward-compatible Ultra160.

The Atlas 10K II provides superior durability and reliability with 352-bit Reed Solomon double-burst ECC on-the-fly, thermal sensing, S.M.A.R.T., and Quantum's breakthrough Shock Protection System (SPS) which guards against one of the leading causes of hard disk failure - mistreatment during handling and integration.

Pricing and Availability
The 9GB, 18GB, 36GB, and 72GB capacity drives for the Atlas 10K II will be in mass production in April 2000 and will be available in volume early second quarter of calendar year 2000. Manufacturer's suggested retail prices for the new Quantum drives are:

•  9GB - $325
•  18GB - $480
•  36GB - $720
•  73GB - $1300

About Quantum
Founded in 1980, Quantum Corporation (www.quantum.com) is the world's leading storage supplier in five of the seven markets it serves: desktop hard disk drives, tape drives, network attached storage (NAS) appliances, solid state systems and hard disk drives for the emerging personal video recorder (PVR) market. Quantum is also the second largest supplier of mid-range tape automation systems and a leading supplier of high-end hard disk drives. In 1999 Quantum became the first Silicon Valley company to issue tracking stock, replacing its existing common stock with the ticker symbols DSS and HDD, which track the separate performance of the company's DLT and Storage Systems and Hard Disk Drive businesses. Both stocks are traded on the New York Stock Exchange. Selling its products through OEM and distribution channels worldwide, sales for the fiscal year ending March 1999 were $1.3 billion for Quantum's DLT and Storage Systems Group and $3.6 billion for Quantum's Hard Disk Drive Group.

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The foregoing statements regarding future technology, products incorporating that technology, estimated product performance, availability and price, and the impact of the new products are forward looking statements and actual results could vary. Factors which could affect actual results include the ability to successfully new technology into products in a cost-effective manner, the ability to successfully manufacture and distribute new products at sufficient volume, quality and reasonable cost, the timing of new product introductions, competition, and the significant uncertainty of market acceptance of new products. Quantum and the Quantum logo are trademarks of Quantum Corporation, registered in the United States and other countries. Atlas is a trademark of Quantum Corporation.