SANTA CLARA, C.A. and OCEANPORT, N.J. — April 7, 2005 — Hitachi Data Systems Corporation, a wholly-owned subsidiary of Hitachi, Ltd. (NYSE: HIT), and CommVault Systems, Inc., a provider of Unified Data Management™ solutions, today announced a worldwide distribution agreement whereby Hitachi Data Systems will offer co-branded QiNetix software as the "Hitachi Data Protection Suite, powered by CommVault®," across all HDS world-wide market segments. The Hitachi Data Protection Suite will be integrated into the Hitachi Business Continuity Solutions framework, enabling customers to leverage the strength and synergy of CommVault's QiNetix product suite with HDS' powerful storage portfolio, to maximize data protection and reliability at reduced costs. Under the terms of the multi-year agreement, both parties may provide support, training and professional services to customers and will work together to add new products and features to current offerings.

This distribution agreement builds upon the companies' existing relationship and extends the parties' efforts to deliver joint solutions for non-disruptive backup. HDS based its partnership decision on CommVault's proven technology, product direction, flexibility and ability to execute. Integrating the QiNetix suite into HDS' existing data management portfolio delivers a unique and powerful solution that can be optimized to meet the specific needs of customers' applications, resulting in an extremely cost-effective and reliable way to manage data.

HDS' selection of CommVault QiNetix as its Hitachi Data Protection Suite was based on four key criteria: strength of industry-leading products, seamless scalability across multiple, heterogeneous market segments with a single code base; a single unified management interface, and CommVault's ability to embrace and extend Hitachi's software products and storage management framework.

For CommVault, the relationship extends their reach in the global enterprise storage space, facilitating faster growth by partnering with the industry leader in large-scale storage virtualization solutions.

"HDS' strategic direction is to provide storage management software that empowers Application Optimized Storage™ solutions," said Jack Domme, vice president, Storage Management Software, Hitachi Data Systems. "As a result, we need to offer a powerful set of management tools that's common across the entire Hitachi storage product line. Our partnership with CommVault, to seamlessly integrate Hitachi Data Protection Suite, complements our software suite of products and enables us to address the needs of the data protection market."

Bob Hammer, CommVault's Chairman and CEO said, "This agreement is a win for CommVault, HDS and our mutual customers. The integration of our QiNetix technology into HDS' storage software marries two industry-leading architectures into one seamless solution, greatly enhancing customers' application and data protection with a high-performance, easy-to-use solution."

The Hitachi Data Protection Suite: Availability
The product will be generally available on May 12, 2005. Customers may contact HDS to purchase immediately.

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

About Hitachi, Ltd.
Hitachi, Ltd. (NYSE: HIT), headquartered in Tokyo, Japan, is a leading global electronics company, with approximately 326,000 employees worldwide. Fiscal 2003 (ended March 31, 2004) consolidated sales totaled 8,632.4 billion yen ($81.4 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 Web site at www.hitachi.com.

About CommVault
CommVault provides Unified Data Management™ solutions to ensure high-performance data protection, universal availability and simplified management of complex storage networks. The CommVault QiNetix suite, based on CommVault's Common Technology Engine, provides the ultimate data protection: managing data throughout its lifecycle via integrated backup/recovery, migration, archiving, replication and storage management. Information about CommVault is available on the World Wide Web at www.commvault.com or by calling (732) 870-4000. CommVault's corporate headquarters is located in Oceanport, New Jersey in the United States.

© Hitachi Data Systems is registered with the U.S. Patent and Trademark Office as a trademark and service mark of Hitachi, Ltd. Application Optimized Storage is a trademark of Hitachi Data Systems Corporation.

© 2005 CommVault Systems, Inc. CommVault, CommVault Systems, CommVault Galaxy, CommVault QiNetix, DataMigrator, DataArchiver, Quick Recovery, QNet, CommServe StorageManager, MediaAgent, iDataAgent, CommCell and the CommVault logo are trademarks and may be registered trademarks in some jurisdictions of CommVault Systems, Inc.