SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 13G INFORMATION STATEMENT PURSUANT TO RULES 13d-1 AND 13d-2 UNDER THE SECURITIES EXCHANGE ACT OF 1934 Quantum Corp-Hard Disk Drive ---------------------------- (Name of Issuer) Common ------ (Title of Class of Securities) 747906303 --------- (CUSIP Number) Page 1 of 5 Pages SCHEDULE 13G CUSIP No. 747906303 - -------------------------------------------------------------------------------- 1) NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Lazard Freres & Co. LLC - -------------------------------------------------------------------------------- 2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) [ ] (b) [ ] - -------------------------------------------------------------------------------- 3) SEC USE ONLY - -------------------------------------------------------------------------------- 4) CITIZENSHIP OR PLACE OF ORGANIZATION New York - -------------------------------------------------------------------------------- 5) SOLE VOTING POWER NUMBER 3,899,300 OF ---------------------------------------------------- SHARES 6) SHARED VOTING POWER BENEFICIALLY None OWNED BY ---------------------------------------------------- EACH 7) SOLE DISPOSITIVE POWER REPORTING 4,293,194 PERSON ---------------------------------------------------- WITH 8) SHARED DISPOSITIVE POWER None - -------------------------------------------------------------------------------- 9) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 4,293,194 - -------------------------------------------------------------------------------- 10) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES [ ] - -------------------------------------------------------------------------------- 11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 5.07% - -------------------------------------------------------------------------------- 12) TYPE OF REPORTING PERSON IA - -------------------------------------------------------------------------------- Schedule 13G Item 1(a). Name of Issuer: Quantum Corp-Hard Disk Drive Item 1(b). Address of Issuer's Principal Executive Offices: 500 McCarthy Blvd. Milpitas, CA 95035 Item 2(a). Name of Person Filing: Lazard Freres & Co. LLC Item 2(b). Address of Principal Business Office or, if None, Residence: 30 Rockefeller Plaza New York, New York 10020 Item 2(c). Citizenship: New York Limited Liability Company Item 2(d). Title of Class of Securities: Common Stock Item 2(e). CUSIP Number: 747906303 Item 3. If this statement is filed pursuant to Rules 13d-1(b), or 13d-2(b), check whether the person filing is a: [ ] (a) Broker or Dealer Registered Under Section 15 of the Act [x] (e) Investment Adviser registered under section 203 of the Investment Advisers Act of 1940 Item 4. Ownership. (a) Amount beneficially owned: 4,293,194 (b) percent of class: 5.07% (c) Number of shares as to which such person has: (i) Sole power to vote or to direct the vote: 3,899,300 (ii) Shared power to vote or to direct the vote: None (iii) Sole power to dispose or to direct the disposition of: 4,293,194 (iv) Shared power to dispose or to direct the disposition of: None Item 5. Ownership of Five Percent or Less of a Class. Not applicable Item 6. Ownership of More than Five Percent on Behalf of Another Person. Clients of the Reporting Person have the right to receive dividends and proceeds of sale of the securities reported on this Schedule. To the knowledge of the Reporting Person, no such person has an interest relating to more than five percent of the class of such securities. Item 7. Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company. Not applicable Item 8. Identification and Classification of Members of the Group. Not applicable Item 9. Notice of Dissolution of Group. Not applicable 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 purposes or effect. SIGNATURE After reasonable inquiry and to the best knowledge and belief of the undersigned, the undersigned certifies that the information set forth in this Statement is true, complete and correct. Date: February 3, 2000 /s/ Donald E. Klein ------------------------- Donald E. Klein Sr. Vice President