Page 1 of 13 Pages UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 13G Under the Securities exchange Act of 1934 (AMENDMENT NO.2)* QUANTUM CORP ----------------------------------------------------- (NAME OF ISSUER) COM DSSG ----------------------------------------------------- (TITLE OF CLASS OF SECURITIES) 747906204 ----------------------------------------------------- (CUSIP NUMBER) December 31, 2001 ----------------------------------------------------- (Date of event which requires filing of this Statement) NOTE: A MAJORITY OF THE SHARES REPORTED IN THIS SCHEDULE 13G ARE HELD BY UNAFFILIATED THIRD-PARTY CLIENT ACCOUNTS MANAGED BY ALLIANCE CAPITAL MANAGEMENT L.P., AS INVESTMENT ADVISER. (ALLIANCE CAPITAL MANAGEMENT L.P. IS A MAJORITY-OWNED SUBSIDIARY OF AXA FINANCIAL, INC.) Check the appropriate box to designate the rule pursuant to which this Schedule is filed: X Rule 13d-1(b) Rule 13d-1(c) Rule 13d-1(d) * 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). (CONTINUED ON FOLLOWING PAGE(S)) CUSIP NO. 747906204 13G Page 2 of 13 Pages 1. NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON AXA Assurances I.A.R.D. Mutuelle 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP * (A) [X] (B) [ ] 3. SEC USE ONLY 4. CITIZENSHIP OR PLACE OF ORGANIZATION France NUMBER OF SHARES 5. SOLE VOTING POWER 12,528,355 BENEFICIALLY OWNED AS OF 6. SHARED VOTING POWER 1,059,115 December 31, 2001 BY EACH 7. SOLE DISPOSITIVE POWER 18,242,504 REPORTING PERSON WITH: 8. SHARED DISPOSITIVE POWER 0 9. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 18,242,504 (Not to be construed as an admission of beneficial ownership) 10. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES * | | 11. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 11.7% 12. TYPE OF REPORTING PERSON * IC * SEE INSTRUCTIONS BEFORE FILLING OUT! CUSIP NO. 747906204 13G Page 3 of 13 Pages 1. NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON AXA Assurances Vie Mutuelle 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP * (A) [X] (B) [ ] 3. SEC USE ONLY 4. CITIZENSHIP OR PLACE OF ORGANIZATION France NUMBER OF SHARES 5. SOLE VOTING POWER 12,528,355 BENEFICIALLY OWNED AS OF 6. SHARED VOTING POWER 1,059,115 December 31, 2001 BY EACH 7. SOLE DISPOSITIVE POWER 18,242,504 REPORTING PERSON WITH: 8. SHARED DISPOSITIVE POWER 0 9. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH 18,242,504 REPORTING PERSON (Not to be construed as an admission of beneficial ownership) 10. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES * | | 11. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 11.7% 12. TYPE OF REPORTING PERSON * IC * SEE INSTRUCTIONS BEFORE FILLING OUT! CUSIP NO. 747906204 13G Page 4 of 13 Pages 1. NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON AXA Conseil Vie Assurance Mutuelle 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP * (A) [X] (B) [ ] 3. SEC USE ONLY 4. CITIZENSHIP OR PLACE OF ORGANIZATION France NUMBER OF SHARES 5. SOLE VOTING POWER 12,528,355 BENEFICIALLY OWNED AS OF 6. SHARED VOTING POWER 1,059,115 December 31, 2001 BY EACH 7. SOLE DISPOSITIVE POWER 18,242,504 REPORTING PERSON WITH: 8. SHARED DISPOSITIVE POWER 0 9. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH 18,242,504 REPORTING PERSON (Not to be construed as an admission of beneficial ownership) 10. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES * | | 11. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 11.7% 12. TYPE OF REPORTING PERSON * IC * SEE INSTRUCTIONS BEFORE FILLING OUT! CUSIP NO. 747906204 13G Page 5 of 13 Pages 1. NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON AXA Courtage Assurance Mutuelle 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP * (A) [X] (B) [ ] 3. SEC USE ONLY 4. CITIZENSHIP OR PLACE OF ORGANIZATION France NUMBER OF SHARES 5. SOLE VOTING POWER 12,528,355 BENEFICIALLY OWNED AS OF 6. SHARED VOTING POWER 1,059,115 December 31, 2001 BY EACH 7. SOLE DISPOSITIVE POWER 18,242,504 REPORTING PERSON WITH: 8. SHARED DISPOSITIVE POWER 0 9. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 18,242,504 (Not to be construed as an admission of beneficial ownership) 10. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES * | | 11. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 11.7% 12. TYPE OF REPORTING PERSON * IC * SEE INSTRUCTIONS BEFORE FILLING OUT! CUSIP NO. 747906204 13G Page 6 of 13 Pages 1. NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON AXA 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP * (A) [ ] (B) [ ] 3. SEC USE ONLY 4. CITIZENSHIP OR PLACE OF ORGANIZATION France NUMBER OF SHARES 5. SOLE VOTING POWER 12,528,355 BENEFICIALLY OWNED AS OF 6. SHARED VOTING POWER 1,059,115 December 31, 2001 BY EACH 7. SOLE DISPOSITIVE POWER 18,242,504 REPORTING PERSON WITH: 8. SHARED DISPOSITIVE POWER 0 9. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 18,242,504 (Not to be construed as an admission of beneficial ownership) 10. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES * | | 11. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 11.7% 12. TYPE OF REPORTING PERSON * IC * SEE INSTRUCTIONS BEFORE FILLING OUT! CUSIP NO. 747906204 13G Page 7 of 13 Pages 1. NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON AXA Financial, Inc. 13-3623351 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP * (A) [ ] (B) [ ] 3. SEC USE ONLY 4. CITIZENSHIP OR PLACE OF ORGANIZATION State of Delaware NUMBER OF SHARES 5. SOLE VOTING POWER 12,528,355 BENEFICIALLY OWNED AS OF 6. SHARED VOTING POWER 1,059,115 December 31, 2001 BY EACH 7. SOLE DISPOSITIVE POWER 18,242,504 REPORTING PERSON WITH: 8. SHARED DISPOSITIVE POWER 0 9. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH 18,242,504 REPORTING PERSON (Not to be construed as an admission of beneficial ownership) 10. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES * | | 11. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 11.7% 12. TYPE OF REPORTING PERSON * HC * SEE INSTRUCTIONS BEFORE FILLING OUT! 13G Page 8 of 13 Pages Item 1(a) Name of Issuer: QUANTUM CORP Item 1(b) Address of Issuer's Principal Executive Offices: 501 Sycamore Dr Milpitas, CA 95035- Item 2(a) and (b) Name of Person Filing and Address of Principal Business Office: AXA Conseil Vie Assurance Mutuelle, AXA Assurances I.A.R.D Mutuelle, and AXA Assurances Vie Mutuelle, 370, rue Saint Honore 75001 Paris, France AXA Courtage Assurance Mutuelle 26, rue Louis le Grand 75002 Paris, France as a group (collectively, the 'Mutuelles AXA'). AXA 25, avenue Matignon 75008 Paris, France AXA Financial, Inc. 1290 Avenue of the Americas New York, New York 10104 (Please contact Patrick Meehan at (212) 314-5644 with any questions.) 13G Page 9 of 13 Pages Item 2(c) Citizenship: Mutuelles AXA and AXA - France AXA Financial, Inc. - Delaware Item 2(d) Title of Class of Securities: COM DSSG Item 2(e) Cusip Number: 747906204 Item 3. Type of Reporting Person: AXA Financial, Inc. as a parent holding company, in accordance with 240.13d-1(b)(ii)(G). The Mutuelles AXA, as a group, acting as a parent holding company. AXA as a parent holding company. 13G Page 10 of 13 Pages 项目4.截至2001年12月31日的所有权（a）有利地拥有的金额：18,242,504股普通股票有利，包括：

股票数量-------------------- mutual AXA，作为集团0 AXA 0 AXA Entity或Entities 0 AXA Financial, Inc. 0子公司:Alliance Capital Management L.P.，仅为投资目的，代表客户全权投资咨询账户收购:普通股18242504 ------------- 总计18242504 ============= 每个Mutuelles安盛,作为一个群体,和安盛明确声明的申请进度13 g不得解释为一个承认,为了交换法的13 (d)部分,任何证券的受益所有人被这个计划13 g覆盖。安盛金融股份有限公司的上述子公司均独立经营，独立决策。 (b)班级比例:11.7% =============

第四项。(c)视为投票权和处分权:

被视为认为必须必须拥有唯一权力共享权力唯一权力的唯一权力，以投票投票，以投票，以投票，以投票，以便丢弃或往往或指导或往往或往往或以指导或往往或其指导或往往或以指导或往往或指导或指导或往往或其指导或以或以指导或往往指导直接投票表决表演性处理----------- ------------ ------------ ------------ mutual AXA，作为一个集团AXA AXA实体或实体:AXA Financial, Inc子公司:- ------------ 联盟资本12528355 1059115 18242504 0格管理公司 . ------------ ------------ ------------ ------------ 12528355 1059115 18242504 0 ============ ============ ============ ============ 上述每个子公司的安盛金融、公司在独立管理下运作，独立投票和投资决策。

第12页，共13页某一类别百分之五或以下的所有权:如果本声明是为了报告自本声明发布之日起报告人已不再是该类别证券百分之五以上的实益所有人而提交的，请检查以下内容。()第6项。代表他人拥有百分之五以上的股份。N / 7项。母公司控股公司购买证券的子公司的识别和分类:本附表13G由安盛金融有限公司提交;亚搏官网app登录入口拥有安盛金融(AXA Financial, Inc.)的安盛集团(AXA);Mutuelles安盛,作为一个群体控制安盛:()在Mutuelles安盛的能力,作为一个群体,作为母公司控股公司对持有以下安盛实体或实体:在安盛的能力()的控股母公司控股公司对以下安盛实体或实体:亚搏官网app登录入口(X) Alliance Capital Management L.P.(13-3434400)，根据1940年《投亚搏官网app登录入口资顾问法案》第203条注册的投资顾问。第13页共13页第8项 Identification and Classification of Members of the Group. N/A Item 9. Notice of Dissolution of 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 purposes 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 11, 2002 AXA FINANCIAL, INC.* /s/ Alvin H. Fenichel Alvin H. Fenichel Senior Vice President and Controller *Pursuant to the Joint Filing Agreement with respect to Schedule 13G attached hereto as Exhibit I, among AXA Financial, Inc., AXA Conseil Vie Assurance Mutuelle, AXA Assurances I.A.R.D Mutuelle, AXA Assurances Vie Mutuelle, AXA Courtage Assurance Mutuelle, and AXA, this statement Schedule 13G is filed on behalf of each of them.