content: <PAGE>
   
  ================================================================================
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
  
                                    FORM 8-K
  
                                 CURRENT REPORT
  
                       PURSUANT TO SECTION 13 OR 15(d) OF
                       THE SECURITIES EXCHANGE ACT OF 1934
  
                               SEPTEMBER 28, 1998
        ----------------------------------------------------------------
                Date of Report (date of earliest event reported)
  
                               QUANTUM CORPORATION
  -------------------------------------------------------------------------------
             (Exact name of Registrant as specified in its charter)
  
           DELAWARE                        0-12390                94-2665054
  ------------------------------------------------------------------------------- 
  (State or other jurisdiction of   (Commission File Number)  (I.R.S. Employer 
  incorporation or organization)                              Identification No.)
  
                              500 MCCARTHY BOULEVARD
                            MILPITAS, CALIFORNIA 95035
         ----------------------------------------------------------------
                     (ADDRESS OF PRINCIPAL EXECUTIVE OFFICES)
  
                                   408-894-4000
               (Registrant's telephone number, including area code)
  
  
  
  
  ===============================================================================
  <PAGE>
   
  ITEM 2.   ACQUISITION OR DISPOSITION ASSETS.
            --------------------------------- 
  
            On May 18, 1998, Quantum Corporation, a Delaware corporation (the
  "Registrant"), entered into a definitive agreement (the "Acquisition Agreement")
  providing for the merger (the "Merger") of  Quick Acquisition Corporation, a
  Delaware corporation and wholly owned subsidiary of the Registrant ("Sub"), with
  and into ATL Products, Inc., a Delaware corporation ("ATL"). The Merger was
  effected on September 28, 1998 (the "Effective Time"), pursuant to a Certificate
  of Merger (the "Certificate of Merger") filed by ATL with the Secretary of State
  of the State of Delaware.  Pursuant to the Certificate of Merger, upon the
  Effective Time of the Merger, each outstanding share of the Class A Common
  Stock, $.0001 par value, and Class B Common Stock, $.0001 par value, of ATL
  (collectively, "ATL Common Stock"), other than shares as to which appraisal
  rights pursuant to the Delaware Business Corporation Law had been exercised and
  shares held in the treasury of ATL or owned by Sub, the Registrant or any
  wholly-owned subsidiary of ATL or the Registrant, were converted into the right
  to receive 1.7554 (the "Exchange Ratio") shares of the Common Stock, $.01 par
  value, of the Registrant ("Registrant Common Stock"), and each outstanding
  option or right to purchase ATL Common Stock under the ATL 1996 Stock Incentive
  Plan and the ATL 1997 Stock Incentive Plan (collectively, the "ATL Stock Option
  Plans") were assumed by the Registrant and became an option or right to purchase
  Registrant Common Stock, with appropriate adjustments to be made to the number
  of shares issuable thereunder and the exercise price thereof based on the
  Exchange Ratio.  In addition, as a result of the Merger, the exercisability of
  certain outstanding options under such ATL Stock Option Plans will accelerate by
  50% as of the Effective Time of the Merger.
  
            The Merger is intended to be a tax-free reorganization under Section
  368(a) of the Internal Revenue Code of 1986, as amended, and is intended to be
  treated as a purchase for financial reporting purposes in accordance with
  generally accepted accounting principles. The assets of ATL were used, prior to
  the Effective Time of the Merger, for the design, manufacturing, marketing and
  servicing of automated magnetic tape libraries used to manage, store and
  transfer data in networked computing environments, a use which the Registrant
  intends to continue immediately following the Merger.
  
  ITEM 7.   FINANCIAL STATEMENTS AND EXHIBITS.
            --------------------------------- 
  
            The following financial statements and exhibits are filed as part of
  this report, where indicated.
  
       (a)  Financial statements of business acquired, prepared pursuant to Rule
            3.05 of Regulation S-X:
  
            Incorporated by reference to the Registrant's Post-Effective Amendment
            No. 1 to the Registration Statement on Form S-4 (File No. 333-61703)
            filed with the Securities and Exchange Commission on August 24, 1998.
  
       (b)  Pro forma financial information required pursuant to Article 11 of
            Regulation S-X:
  
            The pro forma financial information is unavailable as of the date of
            this filing.  Such information will be filed on or before December 12,
            1998.
  
       (c)  Exhibits in accordance with Item 601 of Regulation S-K:
  
       Exhibits.
       -------- 
  
            2.1   Agreement and Plan of Reorganization, dated as of May 18, 1998,
                  by and among Quantum Corporation, a Delaware corporation, ATL
                  Products, Inc., a Delaware corporation, and Quick Acquisition
                  Corporation, a Delaware corporation.
  <PAGE>
   
                  Incorporated by reference to the Registrant's Post-Effective
                  Amendment No. 1 to the Registration Statement on Form S-4 (File
                  No. 333-61703) filed with the Securities and Exchange Commission
                  on August 24, 1998.
  
            2.2   Certificate of Merger by and between Quick Acquisition
                  Corporation, a Delaware corporation, and ATL Products, Inc, a
                  Delaware corporation, dated as of September 28, 1998.
  <PAGE>
   
                                    SIGNATURES
  
  
  
       Pursuant to requirements of the Securities Exchange Act of 1934, the
  Registrant has duly caused this report to be signed on its behalf by the
  undersigned hereunto duly authorized.
  
                                      QUANTUM CORPORATION
  
  
  
                                                    /s/ Andrew Kryder
  Dated:    September 28, 1998                  By:_______________________________
                                                       Andrew Kryder
                                                       Vice President, Finance and
                                                       General Counsel
  <PAGE>
   
                                 INDEX TO EXHIBITS
  
  
  <TABLE>
  <CAPTION>                                                                            SEQUENTIALLY
   EXHIBIT                                                                               NUMBERED
   NUMBER                                 DESCRIPTION                                      PAGE         
                                                                                         
   
  <S>        <C>                                                                     <C>
    2.1        Agreement and Plan of Reorganization, dated as of May 18, 1998, by
               and among Quantum Corporation, a Delaware corporation, ATL
               Products, Inc., a Delaware corporation, and Quick Acquisition
               Corporation, a Delaware corporation.
   
               Incorporated by reference to the Registrant's Post-Effective
               Amendment
               No. 1 to the Registration Statement on Form S-4 (File No. 333-61703)
               filed with the Securities and Exchange Commission on August 24, 1998.
   
    2.2        Certificate of Merger by and between Quick Acquisition Corporation, a
               Delaware corporation, and ATL Products, Inc, a Delaware corporation,
               dated as of September 28, 1998.
   
   
   
   
  </TABLE>
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text: ================================================================================
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
  
                                    FORM 8-K
  
                                 CURRENT REPORT
  
                       PURSUANT TO SECTION 13 OR 15(d) OF
                       THE SECURITIES EXCHANGE ACT OF 1934
  
                               SEPTEMBER 28, 1998
        ----------------------------------------------------------------
                Date of Report (date of earliest event reported)
  
                               QUANTUM CORPORATION
  -------------------------------------------------------------------------------
             (Exact name of Registrant as specified in its charter)
  
           DELAWARE                        0-12390                94-2665054
  ------------------------------------------------------------------------------- 
  (State or other jurisdiction of   (Commission File Number)  (I.R.S. Employer 
  incorporation or organization)                              Identification No.)
  
                              500 MCCARTHY BOULEVARD
                            MILPITAS, CALIFORNIA 95035
         ----------------------------------------------------------------
                     (ADDRESS OF PRINCIPAL EXECUTIVE OFFICES)
  
                                   408-894-4000
               (Registrant's telephone number, including area code)
  
  ===============================================================================
  ITEM 2.   ACQUISITION OR DISPOSITION ASSETS.
            --------------------------------- 
  
            On May 18, 1998, Quantum Corporation, a Delaware corporation (the
  "Registrant"), entered into a definitive agreement (the "Acquisition Agreement")
  providing for the merger (the "Merger") of  Quick Acquisition Corporation, a
  Delaware corporation and wholly owned subsidiary of the Registrant ("Sub"), with
  and into ATL Products, Inc., a Delaware corporation ("ATL"). The Merger was
  effected on September 28, 1998 (the "Effective Time"), pursuant to a Certificate
  of Merger (the "Certificate of Merger") filed by ATL with the Secretary of State
  of the State of Delaware.  Pursuant to the Certificate of Merger, upon the
  Effective Time of the Merger, each outstanding share of the Class A Common
  Stock, $.0001 par value, and Class B Common Stock, $.0001 par value, of ATL
  (collectively, "ATL Common Stock"), other than shares as to which appraisal
  rights pursuant to the Delaware Business Corporation Law had been exercised and
  shares held in the treasury of ATL or owned by Sub, the Registrant or any
  wholly-owned subsidiary of ATL or the Registrant, were converted into the right
  to receive 1.7554 (the "Exchange Ratio") shares of the Common Stock, $.01 par
  value, of the Registrant ("Registrant Common Stock"), and each outstanding
  option or right to purchase ATL Common Stock under the ATL 1996 Stock Incentive
  Plan and the ATL 1997 Stock Incentive Plan (collectively, the "ATL Stock Option
  Plans") were assumed by the Registrant and became an option or right to purchase
  Registrant Common Stock, with appropriate adjustments to be made to the number
  of shares issuable thereunder and the exercise price thereof based on the
  Exchange Ratio.  In addition, as a result of the Merger, the exercisability of
  certain outstanding options under such ATL Stock Option Plans will accelerate by
  50% as of the Effective Time of the Merger.
  
            The Merger is intended to be a tax-free reorganization under Section
  368(a) of the Internal Revenue Code of 1986, as amended, and is intended to be
  treated as a purchase for financial reporting purposes in accordance with
  generally accepted accounting principles. The assets of ATL were used, prior to
  the Effective Time of the Merger, for the design, manufacturing, marketing and
  servicing of automated magnetic tape libraries used to manage, store and
  transfer data in networked computing environments, a use which the Registrant
  intends to continue immediately following the Merger.
  
  ITEM 7.   FINANCIAL STATEMENTS AND EXHIBITS.
            --------------------------------- 
  
            The following financial statements and exhibits are filed as part of
  this report, where indicated.
  
       (a)  Financial statements of business acquired, prepared pursuant to Rule
            3.05 of Regulation S-X:
  
            Incorporated by reference to the Registrant's Post-Effective Amendment
            No. 1 to the Registration Statement on Form S-4 (File No. 333-61703)
            filed with the Securities and Exchange Commission on August 24, 1998.
  
       (b)  Pro forma financial information required pursuant to Article 11 of
            Regulation S-X:
  
            The pro forma financial information is unavailable as of the date of
            this filing.  Such information will be filed on or before December 12,
            1998.
  
       (c)  Exhibits in accordance with Item 601 of Regulation S-K:
  
       Exhibits.
       -------- 
  
            2.1   Agreement and Plan of Reorganization, dated as of May 18, 1998,
                  by and among Quantum Corporation, a Delaware corporation, ATL
                  Products, Inc., a Delaware corporation, and Quick Acquisition
                  Corporation, a Delaware corporation.
  Incorporated by reference to the Registrant's Post-Effective
                  Amendment No. 1 to the Registration Statement on Form S-4 (File
                  No. 333-61703) filed with the Securities and Exchange Commission
                  on August 24, 1998.
  
            2.2   Certificate of Merger by and between Quick Acquisition
                  Corporation, a Delaware corporation, and ATL Products, Inc, a
                  Delaware corporation, dated as of September 28, 1998.
  SIGNATURES
  
       Pursuant to requirements of the Securities Exchange Act of 1934, the
  Registrant has duly caused this report to be signed on its behalf by the
  undersigned hereunto duly authorized.
  
                                      QUANTUM CORPORATION
  
                                                    /s/ Andrew Kryder
  Dated:    September 28, 1998                  By:_______________________________
                                                       Andrew Kryder
                                                       Vice President, Finance and
                                                       General Counsel
  INDEX TO EXHIBITS
  SEQUENTIALLY
   EXHIBIT                                                                               NUMBERED
   NUMBER                                 DESCRIPTION                                      PAGE
  2.1        Agreement and Plan of Reorganization, dated as of May 18, 1998, by
               and among Quantum Corporation, a Delaware corporation, ATL
               Products, Inc., a Delaware corporation, and Quick Acquisition
               Corporation, a Delaware corporation.
   
               Incorporated by reference to the Registrant's Post-Effective
               Amendment
               No. 1 to the Registration Statement on Form S-4 (File No. 333-61703)
               filed with the Securities and Exchange Commission on August 24, 1998.
   
    2.2        Certificate of Merger by and between Quick Acquisition Corporation, a
               Delaware corporation, and ATL Products, Inc, a Delaware corporation,
               dated as of September 28, 1998.