ADIC Q4 Revenue to Exceed Expectations; Branded Sales in North America, Europe, Asia and Federal Sectors Strong.

REDMOND, Wash. -- Advanced Digital Information Corporation (NASDAQ:ADIC) today announced that preliminary results for the fourth quarter ending October 31, 2005, suggest quarterly revenues will exceed the previously described range of expectations for the period.

On August 18, 2005, the Company said fourth quarter revenues "would likely be in the range of $110-$115 million." Results for both fourth quarter and fiscal 2005 are expected to be reported on Thursday, December 15, 2005. Final audited information will be available upon filing of the company's Annual Report on Form 10K expected during January, 2006, following normal audit and Sarbanes Oxley compliance procedures.

"Fourth quarter sales were strong in North America, Europe and Asia as well as in our Federal systems business," according to Chair and Chief Executive Officer Peter van Oppen. "These results appear to reflect increased demand for ADIC hardware, software, tape and disk-based products across virtually all of our branded channel partners and OEMs in virtually all of the geographic markets where we do business," he said. "We normally experience some branded sales strength during the fourth quarter, but early results clearly indicate we exceeded our expectations across the entire business."

ADIC has increased total sales, marketing and R&D spending over the past several years as it has moved to provide differentiated technologies to customers and further establish itself as both the most dominant and most successful independent company in its principal markets.

About ADIC

Advanced Digital Information Corporation (NASDAQ:ADIC) is a leading provider of Intelligent Storage(TM) solutions to the open systems marketplace. ADIC 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, storage networking appliances, and disk-based backup and restore solutions 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, OEMs and partnerships, including Apple, Dell, EMC, Fujitsu-Siemens, HP, IBM, and Sun. Further information about ADIC is available at www.adic.com.

(a)Market Share: Gartner Dataquest, Tape Automation Systems Market Shares, 2004, F. Yale, August 2005. ADIC and Scalar are registered trademarks and Intelligent Storage is a trademark of Advanced Digital Information Corporation. All other trade or service marks mentioned in this document should be considered the property of their respective owners.

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, acceptance of new products, success of new sales channels, technical competition or obsolescence, supply constraints, changes in market pricing, production problems and the Company's ability to complete announced restructurings on schedule. Reference is made to the Company's Annual Report on Form 10-K for the year ended October 31, 2004, 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.