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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549



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FORM 10-Q/A

(Amendment No. 1)



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|x | QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
|- | ---------------------------------------------------------------------------------------



For the quarterly period ended July 31, 2004



OR



| ̈ | TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
|- | ----------------------------------------------------------------------------------------



For the transition period from  to



Commission file number 0-21103



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ADVANCED DIGITAL INFORMATION CORPORATION



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|                                                       |  |                                              
|------------------------------------------------------ |  | ---------------------------------------------
|Incorporated under the laws of the State of Washington |  | I.R.S. Employer Identification No. 91-1618616



11431 Willows Road
N.E.

P.O. Box 97057

Redmond, Washington 98073-9757

(425) 881-8004



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Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was
required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  x    No ̈



Indicate by check mark whether the Registrant is an accelerated filer (as defined in Exchange Act Rule 12b-2)    Yes  x    No ̈



The total shares of common stock without par value outstanding at the end of the quarter reported is 63,547,643.



Explanatory Note



We are filing Amendment No. 1 to our Quarterly Report on Form 10-Q for the
fiscal quarter ended July 31, 2004 to amend and restate Part II and include additional information regarding our stock repurchase program required to be reported under Item 2 of Part II. All information contained in this amendment is as of September
10, 2004, the original filing date of our Quarterly Report. This amendment does not change our previously reported financial statements for the quarter.



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PART II  OTHER INFORMATION



Item 1. Legal Proceedings



On December 22, 2003, three former team members filed a lawsuit against ADIC in U.S. District Court for the Western District of Washington (Williams
et. al vs. Advanced Digital Information Corporation). The plaintiffs alleged that ADIC failed to pay wages in accordance with the Fair Labor Standards Act and the Washington Minimum Wage Act. ADIC settled with the plaintiffs in June 2004 for a
nominal amount. This settlement did not have a material adverse effect on our business, financial condition, liquidity or operating results.



Item 2. Changes in Securities



In connection with ADICs acquisition of Pathlight Technology, Inc. (Pathlight) on May 11, 2001, ADIC assumed all outstanding warrants to
purchase shares of common stock of Pathlight. Accordingly, after applying the applicable conversion ratio to the outstanding Pathlight warrants, ADIC assumed warrants providing for the issuance of an aggregate of 308,291 shares of ADIC common stock
at prices ranging from $1.235 to $7.401 per share (the Assumed Warrants). All of the Assumed Warrants contained provisions permitting net exercise.



The shares of common stock issuable by ADIC upon exercise of the Assumed Warrants have not been registered under the Securities Act of 1933, as
amended, and have been issued upon exercise of Assumed Warrants in reliance on the exemption from registration provided by Section 4(2) of the Securities Act, on the basis that the Assumed Warrants were issued to, and are held by, a limited number
of accredited investors. The following table sets forth information with respect to unregistered shares of ADIC common stock that were issued upon exercise of Assumed Warrants during the quarter ended July 31, 2004:



|             |  |                                          |  |                   |        |                            |       
|------------ |  | ---------------------------------------- |  | ----------------- | ------ | -------------------------- | ------
|Date of Sale |  | Purchaser                                |  | ConsiderationPaid |        | Number of Shares Purchased
|6/4/04       |  | Amschel, LLC / Coller Investment Capital |  | $                 | 54,182 |                            | 22,881
|             |  |                                          |  |                   |        |                            |       



As of June 23, 2004,
the remaining outstanding Assumed Warrants (providing for the issuance of an aggregate of 3,482 shares) expired without being exercised.





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During the quarterly period ended July 31, 2004, ADIC repurchased shares of its common stock on the open
market as set forth on the following table. All shares were purchased under ADICs publicly announced stock repurchase program approved by the Board of Directors in May 2002. The repurchase program permits open market purchases from time to
time and remains in effect until the total authorized number of shares have been repurchased or until earlier terminated by the Board. As of July 31, 2004, a total of 3,989,607 shares remained available for repurchase.



|                                      |  |                                |  |                           |      |                                                                   |           |                                                                   |          
|------------------------------------- |  | ------------------------------ |  | ------------------------- | ---- | ----------------------------------------------------------------- | --------- | ----------------------------------------------------------------- | ---------
|ISSUER PURCHASES OF EQUITY SECURITIES
|Period                                |  | TotalNumber of SharesPurchased |  | AveragePricePaid perShare |      | Total Numberof Shares asPart of PubliclyAnnouncedPlans orPrograms |           | Maximum ofShares thatMay Yet BePurchasedUnder thePlans orPrograms
|Month #1 (May 2004)                   |  | N/A                            |  |                           | N/A  |                                                                   | N/A       |                                                                   | 5,000,000
|Month #2 (June 2004)                  |  | 445,600                        |  | $                         | 9.61 |                                                                   | 445,600   |                                                                   | 4,554,400
|Month #3 (July 2004)                  |  | 564,793                        |  | $                         | 8.96 |                                                                   | 564,793   |                                                                   | 3,989,607
|                                      |  |                                |  |                           |      |                                                                   |           |                                                                   |          
|Total                                 |  | 1,010,393                      |  | $                         | 9.06 |                                                                   | 1,010,393 |                                                                   | 3,989,607
|                                      |  |                                |  |                           |      |                                                                   |           |                                                                   |          



Item 3. Defaults Upon Senior
Securities



None.



Item 4. Submission of Matters to a Vote of Security Holders



None.



Item 5. Other Information



None.



Item 6. Exhibits and Reports on Form 8-K



| | (a) | Exhibits
| | --- | --------



See Exhibit Index on page 19 below.



| | (b) | Reports on Form 8-K
| | --- | -------------------



On May 13, 2004, ADIC furnished a Current Report on Form 8-K under Items 12 and 7 containing a press release announcing financial results relating to our
second quarter of fiscal 2004 ended April 30, 2004.



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EXHIBIT INDEX



|              |  |                                                                                                                                                                                                                     
|------------- |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|ExhibitNumber |  | Description of Exhibits                                                                                                                                                                                             
|31.1          |  | Certification of Peter H. van Oppen, Chair and Chief Executive Officer of Advanced Digital Information Corporation, pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.                                      
|              | 
|31.2          |  | Certification of Jon W. Gacek, Chief Financial Officer and Executive Vice President  Finance and Operations of Advanced Digital Information Corporation, pursuant to Section 302 of the
Sarbanes-Oxley Act of 2002.



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SIGNATURES



Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the
undersigned thereunto duly authorized.



|                          |  |                                                                                                                                         
|------------------------- |  | ----------------------------------------------------------------------------------------------------------------------------------------
|                          |  | ADVANCED DIGITAL INFORMATION CORPORATION                                                                                                
|                          | 
|Dated: September 17, 2004 |  | /s/ PETER H. VAN OPPEN                                                                                                                  
|                          |  | Peter H. van Oppen, Chair and Chief Executive Officer                                                                                   
|                          | 
|Dated: September 17, 2004 |  | /s/ JON W. GACEK                                                                                                                        
|                          |  | Jon W. Gacek, Chief Financial Officer and Executive Vice President  Finance and Operations (Principal Financial and Accounting Officer)