ADIC Expects Second Quarter Revenue of $90 - $95 Million.

Business Editors/High-Tech Writers

REDMOND, Wash.--(BUSINESS WIRE)--April 29, 2003

Advanced Digital Information Corporation (Nasdaq:ADIC) today indicated that revenue for the second quarter ending April 30, 2003 is likely to be between $90 and $95 million.

This new estimate is at the higher end of the $85 to $95 million revenue range provided during the Company's most recent teleconference on February 13. ADIC reported second quarter revenue of $80.7 million in fiscal 2002 and revenue of $97.1 million for first quarter of fiscal 2003.

Chairman and Chief Executive Officer Peter van Oppen noted, "Although not quite through our quarter, we are confident that sales should at least reach the upper half of our February 13 estimate." The Company noted that this updated revenue guidance was issued as a result of the timing between its participation in today's Merrill Lynch Hardware Heaven Technology Conference and the end of the Company's second quarter tomorrow, April 30.

About ADIC

Advanced Digital Information Corporation (Nasdaq:ADIC) is a leading provider of Intelligent Storage(TM) solutions to the open systems marketplace. ADIC(R) is the world's largest supplier of automated tape systems using the drive technologies most often employed for backing up open system, client-server networks.(a) The Company's data management software and storage networking appliances provide IT managers innovative tools for storing, managing and protecting their most valuable digital assets in a variety of disk and tape environments. ADIC storage products are available through a worldwide sales force and a global network of resellers and OEMs, including Cray, Dell, Fujitsu-Siemens, Hewlett-Packard, IBM, and Sun. For more information, visit www.adic.com.

(a) IDC 2001 worldwide revenue and unit market share data for all automated systems using DLT, SDLT, LTO, 8mm or AIT drive, and Gartner Dataquest, 2002 Market Shares and Forecasts for Tape Automation Systems, F. Yale, August 2002.

This release contains forward-looking statements relating to the Company's future products and services and future operating results that are subject to risks and uncertainties that could cause actual results to differ materially from those projected. The words "expect", "anticipate", and similar expressions identify forward-looking statements, but their absence does not mean that the statement is not forward-looking. These statements are not guarantees of future performance and are subject to certain risks, uncertainties and assumptions that are difficult to predict. Factors that could affect the Company's actual results include general economic trends, purchase deferrals by customers, technical competition or obsolescence, supply constraints, changes in market pricing and production problems. Reference is made to the Company's Annual Report on Form 10-K for the year ended October 31, 2002 for a more detailed description of factors that could affect the Company's actual results. Readers are cautioned not to place undue reliance on these forward-looking statements, which speak only as of the date of this release. The Company undertakes no obligation to update publicly any forward-looking statements to reflect new information, events or circumstances after the date of this release or to reflect the occurrence of unanticipated events.

ADIC is a registered trademark and Intelligent Storage is a trademark of Advanced Digital Information Corporation. All other product or company names should be considered the property of their owners.