ADIC SEC Registration Statement Declared Effective; Acquisition of Pathlight Technology, Inc. Expected to Close May 11, 2001.

Business Editors/Technology Writers

REDMOND, Wash.--(BUSINESS WIRE)--April 6, 2001

Advanced Digital Information Corporation (Nasdaq:ADIC) today announced that the registration statement it filed with the Securities Exchange Commission in connection with its pending acquisition of Pathlight Technology, Inc. has been declared effective by the SEC.

Under the terms of the merger agreement, ADIC will issue 10,300,000 shares of common stock for all outstanding stock, warrants and stock options of Pathlight. The number of shares is fixed and is not contingent on the market price. The merger is expected to be accounted for as a pooling of interests.

Pathlight holders of record on March 20, 2001 will be eligible to vote on the merger at a special meeting of Pathlight stockholders to be held on May 9, 2001. Holders of approximately 75% of the Pathlight shares have already agreed to vote in favor of the merger, assuring its approval. ADIC shareholder approval is not required.

The acquisition is expected to close on May 11, 2001, and the one-time acquisition costs, which are estimated to be $10 - $12 million, will be reflected in ADIC's third-quarter results.

About ADIC

Advanced Digital Information Corporation (Nasdaq:ADIC) is a leading device-independent storage solutions provider to the open systems marketplace offering a broad range of products designed to enhance organizations' abilities to store, protect, manage and use their rapidly growing network data. ADIC solutions include automated storage libraries, storage management software, and storage networking (SAN/NAS) connectivity tools. ADIC storage products are available through a worldwide sales force and a global network of resellers and OEMs, including Dell, Fujitsu Siemens and IBM.

Pathlight Technology, Inc. is a storage networking pioneer based in Ithaca, New York. Following the merger with ADIC the combined companies will offer a broad range of Intelligent Storage(TM) products including SAN management, connectivity and virtualization products that complement ADIC's existing storage hardware and software solutions.

This release contains forward-looking statements that are subject to certain risks and uncertainties that could cause actual results to differ materially from those projected. The words "expect," "intend," "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. Reference is made to the Company's Annual Report Form on 10-K for the fiscal year ended October 31, 2000 and the Registration Statement on Form S-4 declared effective on April 6, 2001 for a more detailed description of factors that could affect the Company's actual results and the closing of the merger. 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.

We urge you to read the Prospectus contained in the Registration Statement on Form S-4 that ADIC has filed with the Securities Exchange Commission in connection with the merger, because it contains important information. The Prospectus will be sent to stockholders of Pathlight Technology, Inc. in connection with the solicitation of their approval of the merger. You may obtain a free copy of the Prospectus and other documents filed by ADIC with the Commission at the Commission's web site at www.sec.gov. These documents may also be obtained free of charge by request to ADIC, PO Box 97057, Redmond WA 98073-9757, Attention: Investor Relations. Further information about ADIC is available at www.adic.com.

ADIC is a registered trademark of Advanced Digital Information Corporation. All other product or service marks mentioned in this release should be considered the property of their respective owners.