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
  
       Date of Report (Date of earliest event reported):  September 10, 1999
  
                                QUANTUM CORPORATION
  
              (Exact name of registrant as specified in its charter)
  
               DELAWARE                    0-12390               96-2665054
       (State of incorporation)   (Commission File Number)     (IRS Employer
                                                               Identification No.)
  
                500 McCARTHY BOULEVARD, MILPITAS, CALIFORNIA 95035
  
              (Address of principal executive offices of Registrant)
  
                                  (408) 894-4000
               (Registrant's telephone number, including area code)
  <PAGE>
  
  ITEM 2.  ACQUISITION OR DISPOSITION OF ASSETS
  
  EXCEPT FOR THE HISTORICAL INFORMATION CONTAINED HEREIN, THIS CURRENT REPORT ON
  FORM 8-K (THE "REPORT") CONTAINS FORWARD-LOOKING STATEMENTS THAT KNOWN AND
  UNKNOWN INVOLVE RISKS AND UNCERTAINTIES.  IN PARTICULAR, SEE THE SECTION
  ENTITLED "RISK FACTORS" IN THE PROXY STATEMENT/PROSPECTUS FILED AS PART OF THE
  REGISTRATION STATEMENT ON FORM S-4 (NO. 333-84883) DECLARED EFFECTIVE BY THE SEC
  ON AUGUST 10, 1998.
  
  Defiant Acquisition Sub, Inc., a Delaware corporation ("Merger Sub"), which was
  a wholly owned subsidiary of Quantum Corporation, a Delaware corporation
  ("Quantum"), was merged with and into Meridian Data, Inc., a Delaware
  corporation ("Meridian"), pursuant to an Agreement and Plan of Merger and
  Reorganization, dated as of May 10, 1999, among Quantum, Merger Sub, and
  Meridian (the "Agreement").  The terms of the Agreement were determined through
  arms' length negotiations between Quantum and Meridian.
  
  The merger of Merger Sub with and into Meridian (the "Merger") became effective
  at the time of the filing of a Certificate of Merger with the Delaware Secretary
  of State on September 10, 1999 (the "Effective Time"). Approximately 62.5% of
  the shares of Meridian common stock ("Meridian Common Stock") outstanding and
  entitled to vote, approved the Agreement and the Merger.
  
  Of the Meridian Common Stock eligible to vote on the Merger, approximately 0.2%
  voted against the Agreement and the Merger and approximately 0.1% abstained.
  
  At the Effective Time: (i) Merger Sub ceased to exist; (ii) Meridian, as the
  surviving corporation in the Merger, became a wholly owned subsidiary of
  Quantum; and (iii) subject to the provisions of the Agreement relating to the
  payment of cash in lieu of fractional shares, each share of Meridian Common
  Stock outstanding immediately prior to the Effective Time was converted into the
  right to receive 0.4425 of a share Quantum--DSS & Storage System Group Common
  Stock and 0.22125 of a share of Quantum--Hard Disk Drive Group Common Stock.
  
  In addition, pursuant to the Agreement, at the Effective Time, all rights with
  respect to Meridian options and warrants then outstanding, were converted into
  and became rights with respect to Quantum Common Stock, and Quantum assumed each
  such outstanding Meridian option and warrant in accordance with the terms of
  such option. By virtue of the assumption by Quantum of such Meridian options,
  from and after the Effective Time: (i) each Meridian option assumed by Quantum
  may be exercised solely for Quantum--DSS & Storage System Group Common Stock and
  Quantum--Hard Disk Drive Group Common Stock; (ii) the number of shares of
  Quantum--DSS & Storage System Group Common Stock subject to each such Meridian
  option is equal to the number of shares of Meridian Common Stock subject to such
  option immediately prior to the Effective Time multiplied by 0.4425 and the
  number of shares of Quantum--Hard Disk Drive Group Common Stock subject to each
  such Meridian option is equal to the number of shares of Meridian Common Stock
  subject to such option immediately prior to the Effective Time multiplied by
  0.22125, in each case rounded down to the nearest whole share (with cash, less
  the applicable exercise price, being payable for any fraction of a share); and
  (iii) the per share exercise price under each such Meridian option was adjusted
  by multiplying the per share exercise price under such Meridian option by 1.2068
  and rounding up the nearest cent to determine the exercise price under such
  option with respect to the Quantum--Hard Disk Drive Group Common Stock subject
  to such Meridian option and  by multiplying the per share exercise price under
  such Meridian option by 1.6565  and rounding up the nearest cent to determine
  the exercise price under such option with respect to the Quantum--DLT & Storage
  System Group Common Stock subject to such Meridian option.
  
  The former stockholders of Meridian are receiving approximately 4,053,465 shares
  of Quantum--DSS & Storage System Group Common Stock and 2,026,732 shares of
  Quantum--Hard Disk Drive Group Common Stock pursuant to the Merger.  In
  addition, shares of Meridian options were converted into and become rights with
  respect to approximately 629,656 shares of Quantum--DSS & Storage System Group
  Common Stock and 314,828 shares of Quantum--Hard Disk Drive Group Common Stock.
  With respect to the Meridian options, Quantum assumed each such option in
  accordance with the terms of the stock option plan under which it was issued and
  the stock option agreement by which is it evidenced.
  
  ITEM 5.  QUANTUM CORPORATION CLOSES MERGER WITH MERIDIAN DATA, INC.
  
  On September 10, 1999 Quantum closed its merger with Meridian. A press release
  relating to closing of the merger is attached hereto as Exhibit 99.1.
  <PAGE>
  
  ITEM 7.  FINANCIAL STATEMENTS, PRO FORMA FINANCIAL INFORMATION AND EXHIBITS
  
     (a)  Financial Statements of the Business Acquired
  
     (1)  The required financial statements with respect to the acquired business
     referred to in Item 2 of this Report are incorporated by reference to such
     financial statements as filed with the Securities and Exchange Commission
     (the "Commission") by Meridian Data, Inc. ("Meridian") (Commission File
     Number 0-21200) in Meridian's Annual Report on Form 10-K for the fiscal year
     ended December 31, 1998 and in Meridian's Quarterly Reports on Form 10-Q for
     the quarterly periods ended March 31, 1999 and June 30, 1999.
  
     (b)  Pro Forma Financial Information
  
     Not required.
  
     (c)  Exhibits
  
  EXHIBIT NO.    DESCRIPTION
  
  2.1            Agreement and Plan of Merger and Reorganization, dated as of May
                 10, 1999, among Quantum Corporation, a Delaware Corporation,
                 Defiant Acquisition Sub, Inc., a Delaware Corporation, and
                 Meridian Data, Inc., a Delaware Corporation, (incorporated
                 reference to Exhibit 2.1.1 to Registration Statement on Form S-4
                 (333-84883) filed with the Commission on August 10, 1999).
  
  99.1           Press Release dated September 13, 1999 (filed herewith)
  <PAGE>
  
                                    SIGNATURES
  
  Pursuant to the requirements of the Securities Exchange Act of 1934, as amended,
  the registrant has duly caused this report to be signed on its behalf by the
  undersigned hereunto duly authorized.
  
                                               QUANTUM CORPORATION
  
  Dated:  September 17, 1999         By:     /s/ Richard L. Clemmer
          ------------------         ---
  
                                          Richard L. Clemmer, Executive Vice
                                          President and Chief Financial Officer
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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
  
       Date of Report (Date of earliest event reported):  September 10, 1999
  
                                QUANTUM CORPORATION
  
              (Exact name of registrant as specified in its charter)
  
               DELAWARE                    0-12390               96-2665054
       (State of incorporation)   (Commission File Number)     (IRS Employer
                                                               Identification No.)
  
                500 McCARTHY BOULEVARD, MILPITAS, CALIFORNIA 95035
  
              (Address of principal executive offices of Registrant)
  
                                  (408) 894-4000
               (Registrant's telephone number, including area code)
  ITEM 2.  ACQUISITION OR DISPOSITION OF ASSETS
  
  EXCEPT FOR THE HISTORICAL INFORMATION CONTAINED HEREIN, THIS CURRENT REPORT ON
  FORM 8-K (THE "REPORT") CONTAINS FORWARD-LOOKING STATEMENTS THAT KNOWN AND
  UNKNOWN INVOLVE RISKS AND UNCERTAINTIES.  IN PARTICULAR, SEE THE SECTION
  ENTITLED "RISK FACTORS" IN THE PROXY STATEMENT/PROSPECTUS FILED AS PART OF THE
  REGISTRATION STATEMENT ON FORM S-4 (NO. 333-84883) DECLARED EFFECTIVE BY THE SEC
  ON AUGUST 10, 1998.
  
  Defiant Acquisition Sub, Inc., a Delaware corporation ("Merger Sub"), which was
  a wholly owned subsidiary of Quantum Corporation, a Delaware corporation
  ("Quantum"), was merged with and into Meridian Data, Inc., a Delaware
  corporation ("Meridian"), pursuant to an Agreement and Plan of Merger and
  Reorganization, dated as of May 10, 1999, among Quantum, Merger Sub, and
  Meridian (the "Agreement").  The terms of the Agreement were determined through
  arms' length negotiations between Quantum and Meridian.
  
  The merger of Merger Sub with and into Meridian (the "Merger") became effective
  at the time of the filing of a Certificate of Merger with the Delaware Secretary
  of State on September 10, 1999 (the "Effective Time"). Approximately 62.5% of
  the shares of Meridian common stock ("Meridian Common Stock") outstanding and
  entitled to vote, approved the Agreement and the Merger.
  
  Of the Meridian Common Stock eligible to vote on the Merger, approximately 0.2%
  voted against the Agreement and the Merger and approximately 0.1% abstained.
  
  At the Effective Time: (i) Merger Sub ceased to exist; (ii) Meridian, as the
  surviving corporation in the Merger, became a wholly owned subsidiary of
  Quantum; and (iii) subject to the provisions of the Agreement relating to the
  payment of cash in lieu of fractional shares, each share of Meridian Common
  Stock outstanding immediately prior to the Effective Time was converted into the
  right to receive 0.4425 of a share Quantum--DSS & Storage System Group Common
  Stock and 0.22125 of a share of Quantum--Hard Disk Drive Group Common Stock.
  
  In addition, pursuant to the Agreement, at the Effective Time, all rights with
  respect to Meridian options and warrants then outstanding, were converted into
  and became rights with respect to Quantum Common Stock, and Quantum assumed each
  such outstanding Meridian option and warrant in accordance with the terms of
  such option. By virtue of the assumption by Quantum of such Meridian options,
  from and after the Effective Time: (i) each Meridian option assumed by Quantum
  may be exercised solely for Quantum--DSS & Storage System Group Common Stock and
  Quantum--Hard Disk Drive Group Common Stock; (ii) the number of shares of
  Quantum--DSS & Storage System Group Common Stock subject to each such Meridian
  option is equal to the number of shares of Meridian Common Stock subject to such
  option immediately prior to the Effective Time multiplied by 0.4425 and the
  number of shares of Quantum--Hard Disk Drive Group Common Stock subject to each
  such Meridian option is equal to the number of shares of Meridian Common Stock
  subject to such option immediately prior to the Effective Time multiplied by
  0.22125, in each case rounded down to the nearest whole share (with cash, less
  the applicable exercise price, being payable for any fraction of a share); and
  (iii) the per share exercise price under each such Meridian option was adjusted
  by multiplying the per share exercise price under such Meridian option by 1.2068
  and rounding up the nearest cent to determine the exercise price under such
  option with respect to the Quantum--Hard Disk Drive Group Common Stock subject
  to such Meridian option and  by multiplying the per share exercise price under
  such Meridian option by 1.6565  and rounding up the nearest cent to determine
  the exercise price under such option with respect to the Quantum--DLT & Storage
  System Group Common Stock subject to such Meridian option.
  
  The former stockholders of Meridian are receiving approximately 4,053,465 shares
  of Quantum--DSS & Storage System Group Common Stock and 2,026,732 shares of
  Quantum--Hard Disk Drive Group Common Stock pursuant to the Merger.  In
  addition, shares of Meridian options were converted into and become rights with
  respect to approximately 629,656 shares of Quantum--DSS & Storage System Group
  Common Stock and 314,828 shares of Quantum--Hard Disk Drive Group Common Stock.
  With respect to the Meridian options, Quantum assumed each such option in
  accordance with the terms of the stock option plan under which it was issued and
  the stock option agreement by which is it evidenced.
  
  ITEM 5.  QUANTUM CORPORATION CLOSES MERGER WITH MERIDIAN DATA, INC.
  
  On September 10, 1999 Quantum closed its merger with Meridian. A press release
  relating to closing of the merger is attached hereto as Exhibit 99.1.
  ITEM 7.  FINANCIAL STATEMENTS, PRO FORMA FINANCIAL INFORMATION AND EXHIBITS
  
     (a)  Financial Statements of the Business Acquired
  
     (1)  The required financial statements with respect to the acquired business
     referred to in Item 2 of this Report are incorporated by reference to such
     financial statements as filed with the Securities and Exchange Commission
     (the "Commission") by Meridian Data, Inc. ("Meridian") (Commission File
     Number 0-21200) in Meridian's Annual Report on Form 10-K for the fiscal year
     ended December 31, 1998 and in Meridian's Quarterly Reports on Form 10-Q for
     the quarterly periods ended March 31, 1999 and June 30, 1999.
  
     (b)  Pro Forma Financial Information
  
     Not required.
  
     (c)  Exhibits
  
  EXHIBIT NO.    DESCRIPTION
  
  2.1            Agreement and Plan of Merger and Reorganization, dated as of May
                 10, 1999, among Quantum Corporation, a Delaware Corporation,
                 Defiant Acquisition Sub, Inc., a Delaware Corporation, and
                 Meridian Data, Inc., a Delaware Corporation, (incorporated
                 reference to Exhibit 2.1.1 to Registration Statement on Form S-4
                 (333-84883) filed with the Commission on August 10, 1999).
  
  99.1           Press Release dated September 13, 1999 (filed herewith)
  SIGNATURES
  
  Pursuant to the requirements of the Securities Exchange Act of 1934, as amended,
  the registrant has duly caused this report to be signed on its behalf by the
  undersigned hereunto duly authorized.
  
                                               QUANTUM CORPORATION
  
  Dated:  September 17, 1999         By:     /s/ Richard L. Clemmer
          ------------------         ---
  
                                          Richard L. Clemmer, Executive Vice
                                          President and Chief Financial Officer