Exhibit 99.1 This Proxy is solicited on behalf of the Board of Directors [QUANTUM'S LOGO] SPECIAL MEETING OF STOCKHOLDERS [ ], 1999 The undersigned stockholder(s) of Quantum Corporation, a Delaware corporation, hereby acknowledge(s) receipt of the Notice of Special Meeting of Stockholders and Proxy Statement, each dated , 1999, and hereby appoints Michael A. Brown and Richard L. Clemmer, and each of them, proxies and attorneys-in-fact, with full power to each of substitution, on behalf and in the name of the undersigned, to represent the undersigned at the Special Meeting of Stockholders of Quantum Corporation, to be held , 1999 at 10:00 a.m., Pacific Standard Time, at Quantum Corporation, 500 McCarthy Boulevard, Milpitas, California 95035, and at any adjournment or adjournments thereof, and to vote (including cumulatively, if required) all shares of Common Stock which the undersigned would be entitles to vote if then and there personally present, on the matters set forth on the reverse side: (continued, and to be signed and dated on reverse side) COMPANY # CONTROL # THERE ARE THREE WAYS TO VOTE YOUR PROXY Vote By Phone Vote Via Internet [1-800- ] http://www. Vote by Mail Use any touch- Use the Internet Mark, sign and tone telephone to to vote your date your proxy vote your proxy proxy 24 hours a card and return 24 hours a day, 7 day, 7 days a it in the days a week. Have week. Have your postage-paid your proxy card proxy card proxy envelope we have in hand when you card in hand when provided. call. You will be you access the prompted to enter web site. You your 3-digit will be prompted company number to enter your 3- and a 7-digit digit company control number, number and a 7- which are located digit control above, and then number, Which are follow the simple located above, to instructions. create and electronic ballot. Please detach here Your THE DIRECTORS RECOMMEND A VOTE "FOR" ITEMS 1 AND 2 telephone 1. Proposal to adopt the Restated Certificate of Incorporation or Internet [_] FOR [_] AGAINST [_] ABSTAIN vote authorizes 2. Proposal to adopt amendments to the Quantum Corporation the named Employee Stock Purchase Plan. proxies to vote your [_] FOR [_] AGAINST [_] ABSTAIN shares in the same and in their discretion, upon such other matters which may manner as properly come before the meeting or any adjournment or if you adjournments thereof. marked, signed and The shares represented by this proxy when properly executed will returned be voted in the manner directed herein by the undersigned the proxy Stockholder(s). If no direction is made, this proxy will be voted card. The FOR items 1 and 2. If any other matters properly come before the deadline meeting, or if cumulative voting is required, the persons named in for this proxy will vote, in their discretion. telephone or Internet voting is PST, on , 1999. Dated ------------------------------------ Signature(s) of Stockholder(s) in Box PLEASE SIGN exactly as name appears at left. Joint owners should each sign. Executors, administrators, trustees, etc. should so indicate when signing. If signer is a corporation, please sign full name by duly authorized officer. Address change? Mark box [_] Indicate change at left