SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20594 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 4 )* Quantum Corporation (Name of Issuer) Common Stock (Title of Class of Securities) 747906105 (CUSIP Number) Check the following box if a fee is being paid with this statement [ ]. (A fee is not required only if the filing person: (1) has a previous statement on file reporting beneficial ownership of more than five percent of the class of securities described in Item 1: and (2) has filed no amendment subsequent thereto reporting beneficial ownership of five percent or less of such class.) (See Rule 13d-7). *The remainder of this cover page shall be filled out for a reporting person's initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page. The information required in the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes). 1 NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON The Capital Group Companies, Inc. 86-0206507 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) (b) 3 SEC USE ONLY 4 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware 5 SOLE VOTING POWER NONE 6 SHARED VOTING POWER NUMBER OF SHARES NONE BENEFICIALL Y OWNED BY 7 SOLE DISPOSITIVE POWER EACH REPORTING 4,800,000 PERSON WITH 8 SHARED DISPOSITIVE POWER NONE 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 4,800,000 Beneficial ownership disclaimed pursuant to Rule 13d-4 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 3.5% 12 TYPE OF REPORTING PERSON* HC * SEE INSTRUCTION BEFORE FILLING OUT! SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Schedule 13G Under the Securities Exchange Act of 1934 Amendment No. 4 Item 1(a) Name of Issuer: Quantum Corporation Item 1(b) Address of Issuer's Principal Executive Offices: 500 McCarthy Blvd. Milpitas, CA 95035 Item 2(a) Name of Person(s) Filing: The Capital Group Companies, Inc. Item 2(b) Address of Principal Business Office: 333 South Hope Street Los Angeles, CA 90071 Item 2(c) Citizenship: N/A Item 2(d) Title of Class of Securities: Common Stock Item 2(e) CUSIP Number: 747906105 Item 3 The person(s) filing is(are): (b) [ ] Bank as defined in Section 3(a)(6) of the Act. (g) [X] Parent Holding Company in accordance with Section 240.13d-1(b)(1)(ii)(G). Item 4 Ownership The Capital Group Companies, Inc. is the parent holding company of a group of investment management companies that hold investment power and, in some cases, voting power over the securities reported in this Schedule 13G. The investment management companies, which include a "bank" as defined in Section 3(a)6 of the Securities Exchange Act of 1934 (the "Act") and several investment advisers registered under Section 203 of the Investment Advisers Act of 1940, provide investment advisory and management services for their respective clients which include registered investment companies and institutional accounts. The Capital Group Companies, Inc. does not have investment power or voting power over any of the securities reported herein; however, The Capital Group Companies, Inc. may be deemed to "beneficially own" such securities by virtue of Rule 13d-3 under the Act. Item 5 Ownership of 5% or Less of a Class: [X] Item 7 Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on By the Parent Holding Company 1. Capital Research and Management Company is an Investment Adviser registered under Section 203 of the Investment Advisers Act of 1940 and is a wholly owned subsidiary of The Capital Group Companies, Inc. Item 8 Identification and Classification of Members of the Group: N/A Item 9 Notice of Dissolution of the Group: N/A Item 10 Certification By signing below, I certify that, to the best of my knowledge and belief, the securities referred to above were acquired in the ordinary course of business and were not acquired for the purpose of and do not have the effect of changing or influencing the control of the issuer of such securities and were not acquired in connection with or as a participant in any transaction having such purpose or effect. Signature After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct. Date: February 10, 1998 Signature: *Larry P. Clemmensen Name/Title: Larry P. Clemmensen, President The Capital Group Companies, Inc. *By James P. Ryan Attorney-in-fact Signed pursuant to a Power of Attorney dated December 4, 1997 included as an Exhibit to Schedule 13G filed with the Securities and Exchange Commission by The Capital Group Companies, Inc. on December 10, 1997 with respect to Viatel Inc.