Network Appliance Achieves Network-Attached Storage Market Leadership

Sunnyvale, Calif. - June 6, 2003 -- According to IDC's Worldwide Disk Storage Systems Quarterly report, Network Appliance, Inc. (NASDAQ: NTAP), remains the worldwide leader in network-attached storage (NAS) with 37.3% market share in factory revenue in Q1 2003, up 4.5 points from Q1 2002. Network Appliance also maintained its leadership position with 41% of the NAS terabytes shipped. The results validate that Network Appliance continues to enhance its storage strategy with solutions that bring powerful functionality and scalability to customers and broaden the company's overall market reach.

Based on the report's findings, IDC attributes the momentum in disk storage systems growth to customers' adoption of network storage (NAS and Open SAN). The analyst firm confirms that in Q1 2003 network storage represents over 50% of the total external disk storage systems market, while traditional direct-attached storage represents 42% of the market, down from 46% a year ago.

"The IDC market share report reaffirms our commitment to deliver the highest- performing, most cost-effective solutions in the NAS and worldwide disk storage systems market spaces," said Mark Santora, senior vice president of marketing at Network Appliance. "Our vision continues to be based on delivering solutions that meet current and future customer needs in the enterprise storage space."

About Network Appliance

Network Appliance is a world leader in unified storage solutions for today's data-intensive enterprise. Since its inception in 1992, Network Appliance has delivered technology, product, and partner firsts that continue to drive "The evolution of storage.™" Information about Network Appliance™ solutions and services is available at

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Marla Dierkes
Network Appliance, Inc.