Hitachi Data Systems Makes Significant Market Share Gains over Competitors in High-End Storage Systems for CYQ2 2005

Strong Hitachi TagmaStore Universal Storage Platform Sales Fuel 7 Percent Gain in Share over EMC and IBM, according to A.G. Edwards & Sons

SANTA CLARA, Calif. – November 29, 2005 – Hitachi Data Systems Corporation, provider of Services Oriented Storage Solutions™ solutions and a wholly owned subsidiary of Hitachi, Ltd. (NYSE: HIT), announced significant market share gains in high-end storage systems for the latest calendar quarter ended in September, 2005. According to financial services firm A.G. Edwards & Sons, Hitachi Data Systems gained 7- percent market share in the high-end storage market in the last quarter, given a 6.5-percent sequential decline in EMC's Symmetrix high-end storage business and sluggish growth in the IBM TotalStorage DS8000 and DS6000 series enterprise storage offerings. A.G. Edwards & Sons reports strong sales growth for the Hitachi TagmaStore™ Universal Storage Platform as the driver of Hitachi's market share increase.

Source: A.G. Edwards & Sons

"With the Universal Storage Platform, we changed the storage market landscape with an innovative approach to virtualization, partitioning, and heterogeneous replication," said Dave Roberson, president and chief operating officer, Hitachi Data Systems. "Hitachi‘s strategy of placing virtualization intelligence in the storage controller while commoditizing back-end disk media has and will continue to resonate well with end-users. Our strong results in the quarter show how attractive a proposition this is to our customers."

Note: A.G. Edwards uses the term Hitachi Data Systems to represent Hitachi Ltd.'s SAN/NAS business which is comprised of Hitachi Data Systems global sales, including its global relationship with Sun Microsystems, Hitachi, Ltd.'s sales in Japan as well as sales through global OEM relationships with HP.

Hitachi Data Systems leverages global R&D resources to develop storage solutions built on industry-leading technology with the performance, availability and scalability to maximize customers' ROI and minimize their risk. By focusing on the customer's perspective as we apply the best hardware, software, and services from Hitachi and our partners, we uniquely satisfy our customers' business needs.

With approximately 2,900 employees, Hitachi Data Systems conducts business through direct and indirect channels in the public, government and private sectors in over 170 countries and regions. Its customers include more than 50 percent of Fortune 100 companies. For more information, please visit our Web site at http://www.hds.com.

Hitachi, Ltd., (NYSE: HIT), headquartered in Tokyo, Japan, is a leading global electronics company with approximately 347,000 employees worldwide. Fiscal 2004 (ended March 31, 2005) consolidated sales totaled 9,027.0 billion yen ($84.4 billion). The company offers a wide range of systems, products and services in market sectors including information systems, electronic devices, power and industrial systems, consumer products, materials and financial services. For more information on Hitachi, please visit the company's Website at http://www.hitachi.com.

Hitachi Data Systems
Mary Ann Gallo
(408) 970-4836
mary.ann@hds.com

© 2005, Hitachi Data Systems Corporation. Hitachi Data Systems is registered with the U.S. Patent and Trademark Office as a trademark and service mark of Hitachi, Ltd. Services Oriented Storage Solutions and TagmaStore are trademarks of Hitachi Data Systems Corporation. All other trade names, trademarks, and service marks used herein are the rightful property of their respective owners.