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      <TD align=right width="100%"><FONT size=2><FONT size=3>&nbsp;</FONT>As
        filed with the Securities and Exchange Commission on August 5, 2009<FONT size=3>&nbsp;<BR>&nbsp;</FONT>Registration No. 333-_____</FONT><FONT size=3>&nbsp;</FONT></TD></TR>
    <TR>
      <TD style="BORDER-BOTTOM: #000000 2pt double" align=right width="100%"><STRONG><FONT size=1>&nbsp;</FONT></STRONG></TD></TR></TABLE>
  <P></P>
  <P align=center><B><FONT face=serif size=4>UNITED STATES<BR></FONT></B><B><FONT face=serif size=4>SECURITIES AND EXCHANGE COMMISSION<BR></FONT></B><B><FONT face=serif size=2>Washington, D.C.
  20549<BR>____________________<BR><BR></FONT></B><B><FONT face=serif size=5>FORM
  S-8<BR></FONT></B><B><FONT face=serif size=5>REGISTRATION
  STATEMENT<BR></FONT></B><B><FONT face=serif size=2><EM>Under
  <BR></EM></FONT></B><B><FONT face=serif size=2><EM>The Securities Act of
  1933<BR></EM>____________________<BR><BR></FONT></B><B><FONT face=serif size=5>QUANTUM CORPORATION<BR></FONT></B><B><FONT face=serif size=1>(Exact name
  of issuer as specified in its charter)<BR><FONT size=2>____________________</FONT></FONT></B></P>
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    <TR vAlign=bottom>
      <TD noWrap align=center width="50%"><B><FONT face=serif size=2>DELAWARE</FONT></B>&nbsp;</TD>
      <TD noWrap align=center width="49%"><B><FONT face=serif size=2>94-2665054</FONT></B>&nbsp;</TD></TR>
    <TR vAlign=bottom>
      <TD noWrap align=center width="50%"><B><FONT face=serif size=1>(State of
        incorporation)</FONT></B>&nbsp;</TD>
      <TD noWrap align=center width="49%"><B><FONT face=serif size=1>(I.R.S.
        Employer</FONT></B>&nbsp;</TD></TR>
    <TR vAlign=bottom>
      <TD noWrap align=center width="50%">&nbsp; </TD>
      <TD noWrap align=center width="49%"><B><FONT face=serif size=1>Identification Number)</FONT></B>&nbsp;</TD></TR></TABLE><BR>
  <P align=center><B><FONT face=serif size=2>1650 Technology Drive, Suite
  800<BR>San Jose, California 95110<BR></FONT></B><B><FONT face=serif size=1>(Address of principal executive offices)<BR><FONT size=2>____________________<BR></FONT><BR></FONT></B><B><FONT face=serif size=1><FONT size=2>ADIC-Rocksoft Employee Retention Pool Share
  Plan</FONT><BR>(Full title of the plan(s))<BR><FONT size=2>____________________</FONT></FONT></B></P>
  <P align=center><B><FONT face=serif size=2>Shawn D. Hall <BR></FONT></B><B><FONT face=serif size=2>Sr. Vice President, General Counsel and Secretary<BR>Quantum
  Corporation<BR>1650 Technology Drive, Suite 800<BR>San Jose, California
  95110<BR></FONT></B><B><FONT face=serif size=1>(Name and address of agent for
  service)<BR></FONT></B><B><FONT face=serif size=2>(408)
  944-4000<BR></FONT></B><B><FONT face=serif size=1>(Telephone number, including
  area code, of agent for service)<BR><FONT size=2>____________________</FONT></FONT></B></P>
  <P align=center><I><FONT face=serif size=2>Copy to:<BR></FONT></I><B><FONT face=serif size=2>Steven E. Bochner, Esq.<BR></FONT></B><B><FONT face=serif size=2>WILSON SONSINI GOODRICH &amp; ROSATI<BR>Professional Corporation<BR>650
  Page Mill Road<BR>Palo Alto, California
  94304-1050<BR>____________________</FONT></B></P>
  <P align=justify><FONT face=serif size=2>Indicate by check mark whether the
  registrant is a large accelerated filer, an accelerated filer, a non-accelerated
  filer, or a smaller reporting company. See the definitions of &#147;large accelerated
  filer,&#148; &#147;accelerated filer&#148; and &#147;smaller reporting company&#148; in Rule 12b-2 of the
  Exchange Act.</FONT></P>
  <TABLE style="BORDER-COLLAPSE: collapse" cellSpacing=0 cellPadding=0 width="100%" border=0>
  
    <TR vAlign=bottom>
      <TD noWrap align=left width="49%"><FONT face=serif size=2><FONT size=3>&nbsp;&nbsp;&nbsp;&nbsp; </FONT>Large accelerated filer&nbsp;
        &nbsp;</FONT><FONT face=Wingdings size=2>o</FONT>&nbsp; </TD>
      <TD noWrap align=left width="50%"><FONT size=2><FONT size=3>&nbsp;&nbsp;&nbsp;&nbsp; </FONT>Accelerated
        filer&nbsp;&nbsp;&nbsp;<FONT face=Wingdings size=2>&#254;</FONT><FONT size=3>&nbsp; </FONT></FONT></TD></TR>
    <TR vAlign=bottom>
      <TD noWrap align=left width="49%"><FONT face=serif size=2><FONT size=3>&nbsp;&nbsp;&nbsp;&nbsp; </FONT>Non-accelerated
        filer&nbsp;&nbsp;&nbsp;&nbsp; <FONT face=Wingdings size=2>o</FONT><FONT size=3>&nbsp; </FONT></FONT><FONT face=serif size=2>(Do not check if a
        smaller reporting company)</FONT>&nbsp; </TD>
      <TD noWrap align=left width="50%"><FONT face=serif size=2><FONT size=3>&nbsp;&nbsp;&nbsp;&nbsp; </FONT>Smaller reporting
        company&nbsp;&nbsp;&nbsp;<FONT face=Wingdings size=2>o</FONT><FONT size=3>&nbsp; </FONT></FONT></TD></TR></TABLE><BR>
  <P align=center><B><FONT face=serif size=2>CALCULATION OF REGISTRATION FEE
  </FONT></B></P>
  <TABLE style="BORDER-COLLAPSE: collapse" cellSpacing=0 cellPadding=0 width="100%" border=0>
  
    <TR vAlign=bottom>
      <TD style="BORDER-TOP: #000000 2pt double" noWrap align=left width="64%">&nbsp; </TD>
      <TD style="BORDER-TOP: #000000 2pt double; BORDER-LEFT: #000000 1pt solid" noWrap align=left width="1%"></TD>
      <TD style="BORDER-TOP: #000000 2pt double" noWrap align=center width="5%">&nbsp; </TD>
      <TD style="BORDER-TOP: #000000 2pt double" noWrap align=center width="1%"></TD>
      <TD style="BORDER-TOP: #000000 2pt double; BORDER-LEFT: #000000 1pt solid" noWrap align=center width="5%"></TD>
      <TD style="BORDER-TOP: #000000 2pt double" noWrap align=center width="4%"><B><FONT face=serif size=2>Proposed</FONT></B> </TD>
      <TD style="BORDER-TOP: #000000 2pt double" noWrap align=center width="1%"></TD>
      <TD style="BORDER-TOP: #000000 2pt double; BORDER-LEFT: #000000 1pt solid" noWrap align=center width="1%"></TD>
      <TD style="BORDER-TOP: #000000 2pt double" noWrap align=center width="8%" colSpan=2><B><FONT face=serif size=2>Proposed</FONT></B>&nbsp;</TD>
      <TD style="BORDER-TOP: #000000 2pt double" noWrap align=center width="1%"></TD>
      <TD style="BORDER-TOP: #000000 2pt double; BORDER-LEFT: #000000 1pt solid" noWrap align=center width="1%"></TD>
      <TD style="BORDER-TOP: #000000 2pt double" noWrap align=center width="8%" colSpan=2>&nbsp; </TD></TR>
    <TR vAlign=bottom>
      <TD noWrap align=left width="64%">&nbsp;&nbsp;&nbsp;&nbsp; </TD>
      <TD style="BORDER-LEFT: #000000 1pt solid" noWrap align=center width="1%"></TD>
      <TD noWrap align=center width="5%"><B><FONT face=serif size=2>Amount</FONT></B> </TD>
      <TD noWrap align=center width="1%"></TD>
      <TD style="BORDER-LEFT: #000000 1pt solid" noWrap align=center width="5%"></TD>
      <TD noWrap align=center width="4%"><FONT face=serif size=2><STRONG>Maximum</STRONG><FONT size=3> </FONT></FONT></TD>
      <TD noWrap align=center width="1%"></TD>
      <TD style="BORDER-LEFT: #000000 1pt solid" noWrap align=center width="1%"></TD>
      <TD noWrap align=center width="8%" colSpan=2><B><FONT face=serif size=2>Maximum</FONT></B>&nbsp;</TD>
      <TD noWrap align=center width="1%"></TD>
      <TD style="BORDER-LEFT: #000000 1pt solid" noWrap align=center width="1%"></TD>
      <TD noWrap align=center width="8%" colSpan=2><B><FONT face=serif size=2>Amount of</FONT></B> </TD></TR>
    <TR vAlign=bottom>
      <TD noWrap align=left width="64%">&nbsp; </TD>
      <TD style="BORDER-LEFT: #000000 1pt solid" noWrap align=center width="1%"></TD>
      <TD noWrap align=center width="5%"><B><FONT face=serif size=2>to
        be</FONT></B> </TD>
      <TD noWrap align=center width="1%"></TD>
      <TD style="BORDER-LEFT: #000000 1pt solid" noWrap align=center width="5%"></TD>
      <TD noWrap align=center width="4%"><B><FONT face=serif size=2>Offering
        Price</FONT></B> </TD>
      <TD noWrap align=center width="1%"></TD>
      <TD style="BORDER-LEFT: #000000 1pt solid" noWrap align=center width="1%"></TD>
      <TD noWrap align=center width="8%" colSpan=2><FONT face=serif size=2><STRONG>Aggregate</STRONG><FONT size=3> </FONT></FONT></TD>
      <TD noWrap align=center width="1%"></TD>
      <TD style="BORDER-LEFT: #000000 1pt solid" noWrap align=center width="1%"></TD>
      <TD noWrap align=center width="8%" colSpan=2><B><FONT face=serif size=2>Registration</FONT></B> </TD></TR>
    <TR vAlign=bottom>
      <TD style="BORDER-BOTTOM: #000000 1pt solid" noWrap align=center width="64%"><B><FONT face=serif size=2>Title of Securities to be
        Registered</FONT></B>&nbsp;</TD>
      <TD style="BORDER-LEFT: #000000 1pt solid; BORDER-BOTTOM: #000000 1pt solid" noWrap align=center width="1%">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
      <TD style="BORDER-BOTTOM: #000000 1pt solid" noWrap align=center width="5%"><B><FONT face=serif size=2>Registered</FONT></B> </TD>
      <TD style="BORDER-BOTTOM: #000000 1pt solid" noWrap align=center width="1%">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
      <TD style="BORDER-LEFT: #000000 1pt solid; BORDER-BOTTOM: #000000 1pt solid" noWrap align=center width="5%">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
      <TD style="BORDER-BOTTOM: #000000 1pt solid" noWrap align=center width="4%"><B><FONT face=serif size=2>Per Share</FONT></B> </TD>
      <TD style="BORDER-BOTTOM: #000000 1pt solid" noWrap align=center width="1%">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
      <TD style="BORDER-LEFT: #000000 1pt solid; BORDER-BOTTOM: #000000 1pt solid" noWrap align=center width="1%">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
      <TD style="BORDER-BOTTOM: #000000 1pt solid" noWrap align=center width="8%" colSpan=2><B><FONT face=serif size=2>Offering Price</FONT></B> </TD>
      <TD style="BORDER-BOTTOM: #000000 1pt solid" noWrap align=center width="1%">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
      <TD style="BORDER-LEFT: #000000 1pt solid; BORDER-BOTTOM: #000000 1pt solid" noWrap align=center width="1%">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
      <TD style="BORDER-BOTTOM: #000000 1pt solid" noWrap align=center width="8%" colSpan=2><B><FONT face=serif size=2>Fee</FONT></B> </TD></TR>
    <TR vAlign=bottom>
      <TD noWrap align=left width="64%" bgColor=#ffffff><FONT face=serif size=2>&nbsp;QTM Common Stock, par value $0.01 per share,</FONT>&nbsp; </TD>
      <TD style="BORDER-LEFT: #000000 1pt solid" noWrap align=left width="1%" bgColor=#ffffff></TD>
      <TD noWrap align=left width="5%" bgColor=#ffffff>&nbsp; </TD>
      <TD noWrap align=left width="1%" bgColor=#ffffff></TD>
      <TD style="BORDER-LEFT: #000000 1pt solid" noWrap align=left width="5%" bgColor=#ffffff></TD>
      <TD noWrap align=left width="4%" bgColor=#ffffff>&nbsp; </TD>
      <TD noWrap align=left width="1%" bgColor=#ffffff></TD>
      <TD style="BORDER-LEFT: #000000 1pt solid" noWrap align=left width="1%" bgColor=#ffffff></TD>
      <TD noWrap align=left width="5%" bgColor=#ffffff></TD>
      <TD noWrap align=left width="3%" bgColor=#ffffff>&nbsp; </TD>
      <TD noWrap align=left width="1%" bgColor=#ffffff></TD>
      <TD style="BORDER-LEFT: #000000 1pt solid" noWrap align=left width="1%" bgColor=#ffffff></TD>
      <TD noWrap align=left width="5%" bgColor=#ffffff></TD>
      <TD noWrap align=left width="3%" bgColor=#ffffff>&nbsp; </TD></TR>
    <TR vAlign=bottom>
      <TD noWrap align=left width="64%" bgColor=#ffffff>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<FONT face=serif size=2>issuable under the ADIC-Rocksoft Employee</FONT>&nbsp; </TD>
      <TD style="BORDER-LEFT: #000000 1pt solid" noWrap align=center width="1%" bgColor=#ffffff>&nbsp;</TD>
      <TD noWrap align=center width="5%" bgColor=#ffffff><FONT face=serif size=2>940,000 shares</FONT>&nbsp; </TD>
      <TD noWrap align=right width="1%" bgColor=#ffffff>&nbsp;</TD>
      <TD style="BORDER-LEFT: #000000 1pt solid" noWrap align=center width="5%" bgColor=#ffffff></TD>
      <TD noWrap align=center width="4%" bgColor=#ffffff><FONT face=serif size=2>$0.92</FONT>&nbsp; </TD>
      <TD noWrap align=right width="1%" bgColor=#ffffff></TD>
      <TD style="BORDER-LEFT: #000000 1pt solid" noWrap align=right width="1%" bgColor=#ffffff>&nbsp;</TD>
      <TD noWrap align=right width="5%" bgColor=#ffffff><FONT face=serif size=2>$864,800</FONT> </TD>
      <TD noWrap align=left width="3%" bgColor=#ffffff><FONT face=serif size=2>&nbsp;(1)</FONT>&nbsp; </TD>
      <TD noWrap align=right width="1%" bgColor=#ffffff></TD>
      <TD style="BORDER-LEFT: #000000 1pt solid" noWrap align=right width="1%" bgColor=#ffffff>&nbsp;</TD>
      <TD noWrap align=right width="5%" bgColor=#ffffff><FONT face=serif size=2>$48.26</FONT> </TD>
      <TD noWrap align=left width="3%" bgColor=#ffffff><FONT face=serif size=2>&nbsp;(2)</FONT>&nbsp; </TD></TR>
    <TR vAlign=bottom>
      <TD style="BORDER-BOTTOM: #000000 1pt solid" noWrap align=left width="64%" bgColor=#ffffff>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<FONT face=serif size=2>Retention Pool Share Plan</FONT>&nbsp; </TD>
      <TD style="BORDER-LEFT: #000000 1pt solid; BORDER-BOTTOM: #000000 1pt solid" noWrap align=left width="1%" bgColor=#ffffff></TD>
      <TD style="BORDER-BOTTOM: #000000 1pt solid" noWrap align=left width="5%" bgColor=#ffffff>&nbsp;</TD>
      <TD style="BORDER-BOTTOM: #000000 1pt solid" noWrap align=left width="1%" bgColor=#ffffff>&nbsp;</TD>
      <TD style="BORDER-LEFT: #000000 1pt solid; BORDER-BOTTOM: #000000 1pt solid" noWrap align=left width="5%" bgColor=#ffffff></TD>
      <TD style="BORDER-BOTTOM: #000000 1pt solid" noWrap align=left width="4%" bgColor=#ffffff>&nbsp; </TD>
      <TD style="BORDER-BOTTOM: #000000 1pt solid" noWrap align=left width="1%" bgColor=#ffffff></TD>
      <TD style="BORDER-LEFT: #000000 1pt solid; BORDER-BOTTOM: #000000 1pt solid" noWrap align=left width="1%" bgColor=#ffffff></TD>
      <TD style="BORDER-BOTTOM: #000000 1pt solid" noWrap align=left width="5%" bgColor=#ffffff></TD>
      <TD style="BORDER-BOTTOM: #000000 1pt solid" noWrap align=left width="3%" bgColor=#ffffff>&nbsp; </TD>
      <TD style="BORDER-BOTTOM: #000000 1pt solid" noWrap align=left width="1%" bgColor=#ffffff></TD>
      <TD style="BORDER-LEFT: #000000 1pt solid; BORDER-BOTTOM: #000000 1pt solid" noWrap align=left width="1%" bgColor=#ffffff>&nbsp;</TD>
      <TD style="BORDER-BOTTOM: #000000 1pt solid" noWrap align=left width="5%" bgColor=#ffffff>&nbsp;</TD>
      <TD style="BORDER-BOTTOM: #000000 1pt solid" noWrap align=left width="3%" bgColor=#ffffff>&nbsp; </TD></TR>
    <TR vAlign=bottom>
      <TD style="BORDER-BOTTOM: #000000 2pt double" noWrap align=left width="64%"><FONT face=serif size=2>&nbsp;Total:</FONT>&nbsp; </TD>
      <TD style="BORDER-LEFT: #000000 1pt solid; BORDER-BOTTOM: #000000 2pt double" noWrap align=center width="1%"></TD>
      <TD style="BORDER-BOTTOM: #000000 2pt double" noWrap align=center width="5%"><FONT face=serif size=2>940,000 shares</FONT>&nbsp; </TD>
      <TD style="BORDER-BOTTOM: #000000 2pt double" noWrap align=right width="1%">&nbsp;</TD>
      <TD style="BORDER-LEFT: #000000 1pt solid; BORDER-BOTTOM: #000000 2pt double" noWrap align=center width="5%"></TD>
      <TD style="BORDER-BOTTOM: #000000 2pt double" noWrap align=center width="4%"><FONT face=serif size=2>$0.92</FONT>&nbsp; </TD>
      <TD style="BORDER-BOTTOM: #000000 2pt double" noWrap align=right width="1%"></TD>
      <TD style="BORDER-LEFT: #000000 1pt solid; BORDER-BOTTOM: #000000 2pt double" noWrap align=right width="1%">&nbsp;</TD>
      <TD style="BORDER-BOTTOM: #000000 2pt double" noWrap align=right width="5%"><FONT face=serif size=2>$864,800</FONT> </TD>
      <TD style="BORDER-BOTTOM: #000000 2pt double" noWrap align=left width="3%">&nbsp; </TD>
      <TD style="BORDER-BOTTOM: #000000 2pt double" noWrap align=right width="1%"></TD>
      <TD style="BORDER-LEFT: #000000 1pt solid; BORDER-BOTTOM: #000000 2pt double" noWrap align=right width="1%">&nbsp;</TD>
      <TD style="BORDER-BOTTOM: #000000 2pt double" noWrap align=right width="5%"><FONT face=serif size=2>$48.26</FONT> </TD>
      <TD style="BORDER-BOTTOM: #000000 2pt double" noWrap align=left width="3%">&nbsp; </TD></TR></TABLE><BR>
  <TABLE style="text-align: justify" cellSpacing=0 cellPadding=0 border=0>
  
    <TR>
      <TD vAlign=top noWrap><FONT face=serif size=2>(1)</FONT></TD>
      <TD noWrap>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
      <TD width="100%"><FONT face=serif size=2>Estimated solely for the purpose
        of calculating the amount of the registration fee pursuant to Rules 457(c)
        and (h) under the Securities Act of 1933, as amended (the &#147;Securities
        Act&#148;) on the basis of $0.92 per share, the average of the high and low
        prices per share of the Registrant&#146;s QTM Common Stock on August 3, 2009,
        as reported on the New York Stock Exchange.</FONT></TD></TR>
    <TR>
      <TD vAlign=top noWrap><FONT face=serif size=2>(2)</FONT></TD>
      <TD noWrap></TD>
      <TD width="100%"><FONT face=serif size=2>Amount of the Registration Fee
        was calculated pursuant to Section 6(b) of the Securities Act and was
        determined by multiplying the proposed maximum aggregate offering price by
        0.00005580.</FONT></TD></TR></TABLE>&nbsp;<BR>
  <HR align=center width="100%" noShade SIZE=2>
  <PAGE>
  <P align=center><B><FONT face=serif size=2>QUANTUM CORPORATION
  <BR></FONT></B><B><FONT face=serif size=2>REGISTRATION STATEMENT ON FORM S-8
  </FONT></B></P>
  <P align=center><B><FONT face=serif size=2>PART II </FONT></B></P>
  <P align=center><FONT face=serif size=2>INFORMATION REQUIRED IN REGISTRATION
  STATEMENT </FONT></P>
  <P align=justify><FONT face=serif size=2>ITEM 3. </FONT><U><FONT face=serif size=2>Incorporation of Documents by Reference</FONT></U><FONT face=serif size=2>. </FONT></P>
  <P align=justify>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<FONT face=serif size=2>The
  following documents and information filed with the Securities and Exchange
  Commission (the &#147;Commission&#148;) are hereby incorporated by reference in this
  Registration Statement of Quantum Corporation (referred to herein as the
  &#147;Registrant&#148;): </FONT></P>
  <P style="PADDING-LEFT: 15pt" align=justify>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<FONT face=serif size=2>(a)</FONT><FONT face=sans-serif size=2> </FONT><FONT face=serif size=2>The Registrant's Annual Report on Form 10-K for the fiscal
  year ended March 31, 2009, filed with the Commission pursuant to Section 13 of
  the Securities Exchange Act of 1934, as amended (the &#147;Exchange Act&#148;), on June
  30, 2009; </FONT></P>
  <P style="PADDING-LEFT: 15pt" align=justify>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<FONT face=serif size=2>(b)</FONT><FONT face=sans-serif size=2> </FONT><FONT face=serif size=2>The Registrant&#146;s Current Reports on Form 8-K filed with the
  Commission dated April 15, 2009 (filed April 16, 2009), dated June 3, 2009
  (filed June 9, 2009), dated June 3, 2009 (filed June 9, 2009), dated June 17,
  2009 (filed June 23, 2009), dated June 19, 2009 (filed June 23, 2009) and dated
  July 1, 2009 (filed July 1, 2009); and</FONT></P>
  <P style="PADDING-LEFT: 15pt" align=justify>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<FONT face=serif size=2>(c)</FONT><FONT face=sans-serif size=2> </FONT><FONT face=serif size=2>The description of the Registrant's Common Stock contained in
  the Registrant's Registration Statement on Form 8-A filed with the Commission on
  July 21, 1999 pursuant to Section 12(b) of the Exchange Act and any amendment or
  report filed for the purpose of updating any such description. </FONT></P>
  <P align=justify>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<FONT face=serif size=2>All
  documents filed by the Registrant pursuant to Sections 13(a), 13(c), 14 and
  15(d) of the Exchange Act on or after the date of this Registration Statement
  and prior to the filing of a post-effective amendment to this Registration
  Statement which indicates that all securities offered pursuant to this
  Registration Statement have been sold or which deregisters all securities then
  remaining unsold shall be deemed to be incorporated by reference in this
  Registration Statement and to be part hereof from the date of filing of such
  documents. Any statement contained in a document incorporated or deemed to be
  incorporated by reference in this Registration Statement shall be deemed to be
  modified or superseded for purposes of this Registration Statement to the extent
  that a statement contained herein modifies or supersedes such statement. Any
  such statement so modified or superseded shall not be deemed, except as so
  modified or superseded, to constitute a part of this Registration Statement.
  </FONT></P>
  <P align=justify><FONT face=serif size=2>ITEM 4. </FONT><U><FONT face=serif size=2>Description of Securities</FONT></U><FONT face=serif size=2>. </FONT></P>
  <P align=justify><FONT face=serif size=2><FONT size=3>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT>Inapplicable. </FONT></P>
  <P align=justify><FONT face=serif size=2>ITEM 5. </FONT><U><FONT face=serif size=2>Interests of Named Experts and Counsel</FONT></U><FONT face=serif size=2>. </FONT></P>
  <P align=justify><FONT face=serif size=2><FONT size=3>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT>Inapplicable. </FONT></P>
  <P align=center><FONT face=serif size=2>II-1 </FONT></P>
  <HR align=center width="100%" noShade SIZE=2>
  <PAGE>
  <P align=justify><FONT face=serif size=2>ITEM 6. </FONT><U><FONT face=serif size=2>Indemnification of Directors and Officers</FONT></U><FONT face=serif size=2>. </FONT></P>
  <P align=justify>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<FONT face=serif size=2>Section
  145 of the Delaware General Corporation Law authorizes a court to award, or a
  corporation's Board of Directors to grant, indemnification to directors and
  officers in terms sufficiently broad to permit such indemnification under
  certain circumstances for liabilities (including reimbursement for expenses
  incurred) arising under the Securities Act of 1933, as amended (the &#147;Securities
  Act&#148;). The Registrant&#146;s Amended and Restated Certificate of Incorporation
  contains a provision eliminating the personal liability of the Registrant&#146;s
  directors to the Registrant or its stockholders for breach of fiduciary duty as
  a director to the fullest extent permitted by applicable law. The Registrant's
  Bylaws, as amended, provide for the indemnification of its directors, officers,
  employees and other agents to the maximum extent permitted by Delaware General
  Corporation Law, and the Registrant has entered into agreements with its
  officers, directors and certain key employees implementing such indemnification.
  </FONT></P>
  <P align=justify><FONT face=serif size=2>ITEM 7. </FONT><U><FONT face=serif size=2>Exemption from Registration Claimed</FONT></U><FONT face=serif size=2>.
  </FONT></P>
  <P align=justify><FONT face=serif size=2><FONT size=3>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT>Inapplicable. </FONT></P>
  <P align=justify><FONT face=serif size=2>ITEM 8. </FONT><U><FONT face=serif size=2>Exhibits</FONT></U><FONT face=serif size=2>. </FONT></P>
  <TABLE cellSpacing=0 cellPadding=0 width="85%" border=0>
  
    <TR vAlign=bottom>
      <TD noWrap align=center width="1%"></TD>
      <TD noWrap align=center width="4%" colSpan=3><B><FONT face=serif size=2>Exhibit</FONT></B>&nbsp;</TD>
      <TD noWrap align=center width="1%"></TD>
      <TD noWrap align=left width="94%">&nbsp; </TD></TR>
    <TR vAlign=bottom>
      <TD noWrap align=center width="1%">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
      <TD style="BORDER-BOTTOM: #000000 1pt solid" noWrap align=center width="4%" colSpan=3><B><FONT face=serif size=2>Number</FONT></B>&nbsp;</TD>
      <TD noWrap align=center width="1%">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
      <TD style="BORDER-BOTTOM: #000000 1pt solid" noWrap align=center width="94%"><B><FONT face=serif size=2>Description</FONT></B> </TD></TR>
    <TR vAlign=bottom>
      <TD noWrap align=center width="1%"></TD>
      <TD align=center width="1%" bgColor=#c0c0c0>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
      </TD>
      <TD align=right width="2%" bgColor=#c0c0c0><FONT face=serif size=2>4.1</FONT> </TD>
      <TD align=left width="1%" bgColor=#c0c0c0>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
      </TD>
      <TD align=left width="1%" bgColor=#c0c0c0></TD>
      <TD align=left width="94%" bgColor=#c0c0c0><FONT face=serif size=2>ADIC-Rocksoft Employee Retention Pool Share Plan</FONT></TD></TR>
    <TR>
      <TD noWrap align=center width="1%"></TD>
      <TD align=center width="1%"></TD>
      <TD align=right width="2%"></TD>
      <TD align=left width="1%"></TD>
      <TD align=left width="1%"></TD>
      <TD align=left width="94%">&nbsp;</TD></TR>
    <TR vAlign=bottom>
      <TD noWrap align=center width="1%"></TD>
      <TD align=center width="1%" bgColor=#c0c0c0></TD>
      <TD align=right width="2%" bgColor=#c0c0c0><FONT face=serif size=2>5.1</FONT> </TD>
      <TD align=left width="1%" bgColor=#c0c0c0></TD>
      <TD align=left width="1%" bgColor=#c0c0c0></TD>
      <TD align=left width="94%" bgColor=#c0c0c0><FONT face=serif size=2>Opinion
        regarding legality of Wilson Sonsini Goodrich &amp; Rosati,
    P.C.</FONT></TD></TR>
    <TR vAlign=bottom>
      <TD noWrap align=left width="1%"></TD>
      <TD align=left width="1%">&nbsp;</TD>
      <TD align=right width="2%">&nbsp; </TD>
      <TD align=left width="1%">&nbsp;</TD>
      <TD align=left width="1%"></TD>
      <TD align=left width="94%">&nbsp;&nbsp; </TD></TR>
    <TR vAlign=bottom>
      <TD noWrap align=center width="1%"></TD>
      <TD align=center width="1%" bgColor=#c0c0c0></TD>
      <TD align=right width="2%" bgColor=#c0c0c0><FONT face=serif size=2>23.1</FONT> </TD>
      <TD align=left width="1%" bgColor=#c0c0c0></TD>
      <TD align=left width="1%" bgColor=#c0c0c0></TD>
      <TD align=left width="94%" bgColor=#c0c0c0><FONT face=serif size=2>Consent
        of PricewaterhouseCoopers LLP</FONT></TD></TR>
    <TR>
      <TD noWrap align=center width="1%"></TD>
      <TD align=center width="1%"></TD>
      <TD align=right width="2%"></TD>
      <TD align=left width="1%"></TD>
      <TD align=left width="1%"></TD>
      <TD align=left width="94%">&nbsp;</TD></TR>
    <TR vAlign=bottom>
      <TD noWrap align=center width="1%"></TD>
      <TD align=center width="1%" bgColor=#c0c0c0></TD>
      <TD align=right width="2%" bgColor=#c0c0c0><FONT face=serif size=2>23.2</FONT> </TD>
      <TD align=left width="1%" bgColor=#c0c0c0></TD>
      <TD align=left width="1%" bgColor=#c0c0c0></TD>
      <TD align=left width="94%" bgColor=#c0c0c0><FONT face=serif size=2>Consent
        of Ernst &amp; Young LLP</FONT></TD></TR>
    <TR>
      <TD noWrap align=center width="1%"></TD>
      <TD align=center width="1%"></TD>
      <TD align=right width="2%"></TD>
      <TD align=left width="1%"></TD>
      <TD align=left width="1%"></TD>
      <TD align=left width="94%">&nbsp;</TD></TR>
    <TR vAlign=bottom>
      <TD noWrap align=center width="1%"></TD>
      <TD align=center width="1%" bgColor=#c0c0c0></TD>
      <TD align=right width="2%" bgColor=#c0c0c0><FONT face=serif size=2>23.3</FONT> </TD>
      <TD align=left width="1%" bgColor=#c0c0c0></TD>
      <TD align=left width="1%" bgColor=#c0c0c0></TD>
      <TD align=left width="94%" bgColor=#c0c0c0><FONT face=serif size=2>Consent
        of Wilson Sonsini Goodrich &amp; Rosati, P.C. (included in Exhibit
        5.1)</FONT></TD></TR>
    <TR vAlign=bottom>
      <TD noWrap align=left width="1%"></TD>
      <TD align=left width="1%"></TD>
      <TD align=right width="2%">&nbsp; </TD>
      <TD align=left width="1%"></TD>
      <TD align=left width="1%"></TD>
      <TD align=left width="94%">&nbsp;&nbsp; </TD></TR>
    <TR vAlign=bottom>
      <TD noWrap align=center width="1%"></TD>
      <TD align=center width="1%" bgColor=#c0c0c0></TD>
      <TD align=right width="2%" bgColor=#c0c0c0><FONT face=serif size=2>24.1</FONT> </TD>
      <TD align=left width="1%" bgColor=#c0c0c0></TD>
      <TD align=left width="1%" bgColor=#c0c0c0></TD>
      <TD align=left width="94%" bgColor=#c0c0c0><FONT face=serif size=2>Power
        of Attorney (see page II-6)</FONT></TD></TR></TABLE><BR>
  <P align=justify><FONT face=serif size=2>ITEM 9. </FONT><U><FONT face=serif size=2>Undertakings</FONT></U><FONT face=serif size=2>. </FONT></P>
  <P align=justify><FONT face=serif size=2><FONT size=3>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT>A.</FONT><B><FONT face=serif size=2>
  </FONT></B><FONT face=serif size=2>The undersigned Registrant hereby undertakes:
  </FONT></P>
  <P style="PADDING-LEFT: 15pt" align=justify>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<FONT face=serif size=2>(1) To file, during any period in which offers or sales are
  being made, a post-effective amendment to this Registration
  Statement:</FONT></P>
  <P style="PADDING-LEFT: 30pt" align=justify><FONT face=serif size=2><FONT size=3>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT>(i) To include any prospectus
  required by Section 10(a)(3) of the Securities Act;</FONT></P>
  <P style="PADDING-LEFT: 30pt" align=justify>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<FONT face=serif size=2>(ii) To reflect in the prospectus any facts or events arising
  after the effective date of the Registration Statement (or the most recent
  post-effective amendment thereof) which, individually or in the aggregate,
  represent a fundamental change in the information set forth in the Registration
  Statement. Notwithstanding the foregoing, any increase or decrease in volume of
  securities offered (if the total dollar value of securities offered would not
  exceed that which was registered) and any deviation from the low or high end of
  the estimated maximum offering range may be reflected in the form of prospectus
  filed with the Commission pursuant to Rule 424(b) if, in the aggregate, the
  changes in volume and price represent no more than a 20 percent change in the
  maximum aggregate offering price set forth in the &#147;Calculation of Registration
  Fee&#148; table in the effective Registration Statement;</FONT></P>
  <P align=center><FONT face=serif size=2>II-2 </FONT></P>
  <HR align=center width="100%" noShade SIZE=2>
  <PAGE>
  <P style="PADDING-LEFT: 30pt" align=justify>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<FONT face=serif size=2>(iii) To include any material information with respect to the
  plan of distribution not previously disclosed in the Registration Statement or
  any material change to such information in the Registration
  Statement;</FONT></P>
  <P style="PADDING-LEFT: 30pt" align=justify>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I><FONT face=serif size=2>provided,
  however, </FONT></I><FONT face=serif size=2>that paragraphs (a)(1)(i) and
  (a)(1)(ii) do not apply if the information required to be included in a
  post-effective amendment by those paragraphs is contained in reports filed with
  or furnished to the Commission by the Registrant pursuant to Section 13 or
  Section 15(d) of the Exchange Act that are incorporated by reference in the
  Registration Statement.</FONT></P>
  <P style="PADDING-LEFT: 15pt" align=justify>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<FONT face=serif size=2>(2) That, for the purpose of determining any liability under
  the Securities Act, each such post-effective amendment shall be deemed to be a
  new registration statement relating to the securities offered therein, and the
  offering of such securities at that time shall be deemed to be the initial
  </FONT><I><FONT face=serif size=2>bona fide </FONT></I><FONT face=serif size=2>offering thereof.</FONT></P>
  <P style="PADDING-LEFT: 15pt" align=justify>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<FONT face=serif size=2>(3) To remove from registration by means of a post-effective
  amendment any of the securities being registered which remain unsold at the
  termination of the offering.</FONT></P>
  <P style="PADDING-LEFT: 15pt" align=justify>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<FONT face=serif size=2>(4) That, for purposes of determining liability under the
  Securities Act to any purchaser, each prospectus filed pursuant to Rule 424(b)
  as part of a registration statement relating to an offering, other than
  registration statements relying on Rule 430B or other than prospectuses filed in
  reliance on Rule 430A, shall be deemed to be part of and included in the
  Registration Statement as of the date it is first used after effectiveness.
  Provided, however, that no statement made in a registration statement or
  prospectus that is part of the Registration Statement or made in a document
  incorporated or deemed incorporated by reference into the Registration Statement
  or prospectus that is part of the Registration Statement will, as to a purchaser
  with a time of contract of sale prior to such first use, supersede or modify any
  statement that was made in the Registration Statement or prospectus that was
  part of the Registration Statement or made in any such document immediately
  prior to such date of first use. </FONT></P>
  <P style="PADDING-LEFT: 15pt" align=justify>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<FONT face=serif size=2>(5) That, for the purpose of determining liability of the
  Registrant under the Securities Act to any purchaser in the initial distribution
  of the securities, in a primary offering of securities of the undersigned
  Registrant pursuant to this Registration Statement, regardless of the
  underwriting method used to sell the securities to the purchaser, if the
  securities are offered or sold to such purchaser by means of any of the
  following communications, the undersigned Registrant will be a seller to the
  purchaser and will be considered to offer or sell such securities to such
  purchaser: (i) Any preliminary prospectus or prospectus of the undersigned
  Registrant relating to the offering required to be filed pursuant to Rule 424;
  (ii) Any free writing prospectus relating to the offering prepared by or on
  behalf of the undersigned Registrant or used or referred to by the undersigned
  Registrant; (iii) The portion of any other free writing prospectus relating to
  the offering containing material information about the undersigned Registrant or
  its securities provided by or on behalf of the undersigned Registrant; and (iv)
  Any other communication that is an offer in the offering made by the undersigned
  Registrant to the purchaser. </FONT></P>
  <P align=justify>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<FONT face=serif size=2>B. The
  undersigned Registrant hereby undertakes that, for purposes of determining any
  liability under the Securities Act, each filing of the Registrant's annual
  report pursuant to Section 13(a) or Section 15(d) of the Exchange Act (and,
  where applicable, each filing of an employee benefit plan's annual report
  pursuant to Section 15(d) of the Exchange Act) that is incorporated by reference
  in the registration statement shall be deemed to be a new registration statement
  relating to the securities offered therein, and the offering of such securities
  at that time shall be deemed to be the initial bona fide offering thereof.
  </FONT></P>
  <P align=center><FONT face=serif size=2>II-3 </FONT></P>
  <HR align=center width="100%" noShade SIZE=2>
  <PAGE>
  <P align=justify>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<FONT face=serif size=2>C.
  Insofar as indemnification for liabilities arising under the Securities Act may
  be permitted to directors, officers and controlling persons of the Registrant
  pursuant to the foregoing provisions, or otherwise, the Registrant has been
  advised that in the opinion of the Commission such indemnification is against
  public policy as expressed in the Securities Act and is, therefore,
  unenforceable. In the event that a claim for indemnification against such
  liabilities (other than the payment by the Registrant of expenses incurred or
  paid by a director, officer or controlling person of the Registrant in
  successful defense of any action, suit or proceeding) is asserted by such
  director, officer or controlling person in connection with the securities being
  registered hereunder, the Registrant will, unless in the opinion of its counsel
  the matter has been settled by controlling precedent, submit to a court of
  appropriate jurisdiction the question of whether such indemnification by it is
  against public policy as expressed in the Securities Act and will be governed by
  the final adjudication of such issue. </FONT></P>
  <P align=center><FONT size=2>II-4</FONT></P>
  <HR align=center width="100%" noShade SIZE=2>
  <PAGE>
  <P align=center><FONT face=serif size=2>SIGNATURES </FONT></P>
  <P align=justify>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<FONT face=serif size=2>Pursuant
  to the requirements of the Securities Act, as amended, the Registrant, Quantum
  Corporation, a corporation organized and existing under the laws of the State of
  Delaware, certifies that it has reasonable grounds to believe that it meets all
  of the requirements for filing on Form S-8 and has duly caused this Registration
  Statement to be signed on its behalf by the undersigned, thereunto duly
  authorized, in the City of San Jose, State of California, on this 5<SUP>th</SUP>
  day of August, 2009.</FONT></P>
  <TABLE cellSpacing=0 cellPadding=0 width="100%" border=0>
  
    <TR vAlign=bottom>
      <TD noWrap align=left width="50%"></TD>
      <TD noWrap align=left width="50%" colSpan=2><FONT face=serif size=2>QUANTUM CORPORATION</FONT>&nbsp; </TD></TR>
    <TR>
      <TD width="50%"></TD>
      <TD width="1%"></TD>
      <TD width="49%">&nbsp;&nbsp; </TD></TR>
    <TR vAlign=bottom>
      <TD noWrap align=left width="50%"></TD>
      <TD noWrap align=left width="1%"><FONT size=2>By:&nbsp;&nbsp; </FONT></TD>
      <TD style="BORDER-BOTTOM: #000000 1pt solid" noWrap align=left width="49%"><FONT face=serif size=2>/s/ Shawn D. Hall</FONT>&nbsp; </TD></TR>
    <TR vAlign=bottom>
      <TD noWrap align=left width="50%"></TD>
      <TD noWrap align=left width="1%">&nbsp;</TD>
      <TD noWrap align=left width="49%"><FONT face=serif size=2>Shawn D.
        Hall</FONT>&nbsp; </TD></TR>
    <TR vAlign=bottom>
      <TD noWrap align=left width="50%"></TD>
      <TD noWrap align=left width="1%"></TD>
      <TD noWrap align=left width="49%"><FONT face=serif size=2>Senior Vice
        President, General Counsel and Secretary</FONT>&nbsp; </TD></TR></TABLE>
  <P align=center><FONT size=2>II-5</FONT></P>
  <HR align=center width="100%" noShade SIZE=2>
  <PAGE>
  <P align=center><FONT face=serif size=2>POWER OF ATTORNEY </FONT></P>
  <P align=justify>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<FONT face=serif size=2>KNOW ALL
  PERSONS BY THESE PRESENTS, that each person whose signature appears below
  constitutes and appoints Richard E. Belluzzo and Shawn D. Hall, jointly and
  severally, his or her attorneys-in-fact, each with the power of substitution,
  for him or her in any and all capacities, to sign any and all amendments to this
  Registration Statement on Form S-8 (including post-effective amendments), and to
  file the same, with exhibits thereto and other documents in connection
  therewith, with the Securities and Exchange Commission, hereby ratifying and
  confirming all that each of said attorneys-in-fact, or his substitute or
  substitutes, may do or cause to be done by virtue hereof. </FONT></P>
  <P align=justify>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<FONT face=serif size=2>Pursuant
  to the requirements of the Securities Act, this Registration Statement has been
  signed by the following persons in the capacities and on the dates
  indicated:</FONT></P>
  <TABLE cellSpacing=0 cellPadding=0 width="100%" border=0>
  
    <TR vAlign=bottom>
      <TD style="BORDER-BOTTOM: #000000 1pt solid" noWrap align=center width="22%"><B><FONT face=serif size=2>Signature</FONT></B> </TD>
      <TD noWrap align=center width="1%">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
      <TD style="BORDER-BOTTOM: #000000 1pt solid" noWrap align=center width="60%"><B><FONT face=serif size=2>Title</FONT></B> </TD>
      <TD noWrap align=center width="1%">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
      <TD style="BORDER-BOTTOM: #000000 1pt solid" noWrap align=center width="15%"><B><FONT face=serif size=2>Date</FONT></B> </TD></TR>
    <TR vAlign=bottom>
      <TD style="BORDER-BOTTOM: #000000 1pt solid" noWrap align=left width="22%" bgColor=#ffffff><FONT face=serif size=2>/s/<FONT size=3>&nbsp;</FONT>Richard E. Belluzzo</FONT>&nbsp; </TD>
      <TD noWrap align=left width="1%" bgColor=#ffffff></TD>
      <TD align=left width="60%" bgColor=#ffffff><FONT face=serif size=2>Chief
        Executive Officer and Chairman of the Board (Principal Executive
        Officer)<FONT size=3>&nbsp; </FONT></FONT></TD>
      <TD noWrap align=right width="1%" bgColor=#ffffff></TD>
      <TD noWrap align=left width="15%" bgColor=#ffffff><FONT face=serif size=2>August 5, 2009</FONT>&nbsp; </TD></TR>
    <TR vAlign=bottom>
      <TD noWrap align=center width="22%" bgColor=#ffffff><FONT face=serif size=2>(Richard E. Belluzzo)</FONT>&nbsp; </TD>
      <TD noWrap align=left width="1%" bgColor=#ffffff></TD>
      <TD align=left width="60%" bgColor=#ffffff>&nbsp; </TD>
      <TD noWrap align=left width="1%" bgColor=#ffffff></TD>
      <TD noWrap align=left width="15%" bgColor=#ffffff>&nbsp; </TD></TR>
    <TR>
      <TD style="BORDER-BOTTOM: #000000 1pt solid" noWrap align=left width="22%" bgColor=#ffffff><FONT size=2>/s/</FONT><FONT size=3>
        </FONT><FONT size=2>Jon W. Gacek</FONT>&nbsp; </TD>
      <TD noWrap align=left width="1%" bgColor=#ffffff></TD>
      <TD align=left width="60%" bgColor=#ffffff><FONT size=2>Executive Vice President, Chief Financial Officer and Chief
        Operating Officer</FONT><FONT size=3>&nbsp;</FONT></TD>
      <TD noWrap align=left width="1%" bgColor=#ffffff></TD>
      <TD noWrap align=left width="15%" bgColor=#ffffff><FONT size=2>August 5, 2009</FONT><FONT size=3>&nbsp; </FONT></TD></TR>
    <TR vAlign=bottom>
      <TD noWrap align=center width="22%" bgColor=#ffffff><FONT size=2>(Jon W.
        Gacek)</FONT>&nbsp;</TD>
      <TD noWrap align=left width="1%" bgColor=#ffffff></TD>
      <TD align=left width="60%" bgColor=#ffffff><FONT face=serif size=2><FONT size=3><FONT size=2>(Principal Financial Officer and Principal Accounting
        Officer)</FONT><FONT size=3>&nbsp;</FONT></FONT></FONT></TD>
      <TD noWrap align=left width="1%" bgColor=#ffffff></TD>
      <TD noWrap align=left width="15%" bgColor=#ffffff><FONT size=3></FONT></TD></TR>
    <TR vAlign=bottom>
      <TD style="BORDER-BOTTOM: #000000 1pt solid" noWrap align=left width="22%" bgColor=#ffffff><FONT face=serif size=2>/s/ Paul R. Auvil,
        III</FONT>&nbsp; </TD>
      <TD noWrap align=left width="1%" bgColor=#ffffff>&nbsp;</TD>
      <TD noWrap align=left width="60%" bgColor=#ffffff><FONT size=2>Director</FONT>&nbsp; </TD>
      <TD noWrap align=left width="1%" bgColor=#ffffff></TD>
      <TD noWrap align=left width="15%" bgColor=#ffffff><FONT size=2>August 5,
        2009</FONT><FONT size=3>&nbsp; </FONT></TD></TR>
    <TR vAlign=bottom>
      <TD noWrap align=center width="22%" bgColor=#ffffff><FONT face=serif size=2>(Paul R. Auvil, III)</FONT>&nbsp;</TD>
      <TD noWrap align=left width="1%" bgColor=#ffffff></TD>
      <TD noWrap align=left width="60%" bgColor=#ffffff></TD>
      <TD noWrap align=right width="1%" bgColor=#ffffff></TD>
      <TD noWrap align=left width="15%" bgColor=#ffffff><FONT face=serif size=2><FONT size=3></FONT></FONT></TD></TR>
    <TR vAlign=bottom>
      <TD style="BORDER-BOTTOM: #000000 1pt solid" noWrap align=left width="22%" bgColor=#ffffff><FONT size=2>/s/</FONT>&nbsp;<FONT face=serif size=2>Michael A. Brown</FONT>&nbsp; </TD>
      <TD noWrap align=left width="1%" bgColor=#ffffff></TD>
      <TD noWrap align=left width="60%" bgColor=#ffffff><FONT face=serif size=2>Director</FONT>&nbsp; </TD>
      <TD noWrap align=right width="1%" bgColor=#ffffff></TD>
      <TD noWrap align=left width="15%" bgColor=#ffffff><FONT face=serif size=2>August 5, 2009<FONT size=3>&nbsp; </FONT></FONT></TD></TR>
    <TR vAlign=bottom>
      <TD noWrap align=center width="22%" bgColor=#ffffff><FONT face=serif size=2>(Michael A. Brown)</FONT>&nbsp;</TD>
      <TD noWrap align=left width="1%" bgColor=#ffffff></TD>
      <TD noWrap align=left width="60%" bgColor=#ffffff>&nbsp; </TD>
      <TD noWrap align=left width="1%" bgColor=#ffffff></TD>
      <TD noWrap align=left width="15%" bgColor=#ffffff>&nbsp; </TD></TR>
    <TR vAlign=bottom>
      <TD style="BORDER-BOTTOM: #000000 1pt solid" noWrap align=left width="22%" bgColor=#ffffff><FONT size=2>/s/</FONT>&nbsp;<FONT face=serif size=2>Thomas S. Buchsbaum</FONT>&nbsp; </TD>
      <TD noWrap align=left width="1%" bgColor=#ffffff></TD>
      <TD noWrap align=left width="60%" bgColor=#ffffff><FONT face=serif size=2>Director</FONT>&nbsp; </TD>
      <TD noWrap align=right width="1%" bgColor=#ffffff></TD>
      <TD noWrap align=left width="15%" bgColor=#ffffff><FONT face=serif size=2>August 5, 2009<FONT size=3>&nbsp; </FONT></FONT></TD></TR>
    <TR vAlign=bottom>
      <TD noWrap align=center width="22%" bgColor=#ffffff><FONT face=serif size=2>(Thomas S. Buchsbaum)</FONT>&nbsp;</TD>
      <TD noWrap align=left width="1%" bgColor=#ffffff></TD>
      <TD noWrap align=left width="60%" bgColor=#ffffff>&nbsp; </TD>
      <TD noWrap align=left width="1%" bgColor=#ffffff></TD>
      <TD noWrap align=left width="15%" bgColor=#ffffff>&nbsp; </TD></TR>
    <TR vAlign=bottom>
      <TD style="BORDER-BOTTOM: #000000 1pt solid" noWrap align=left width="22%" bgColor=#ffffff><FONT size=2>/s/</FONT>&nbsp;<FONT face=serif size=2>Edward M. Esber, Jr.</FONT>&nbsp; </TD>
      <TD noWrap align=left width="1%" bgColor=#ffffff></TD>
      <TD noWrap align=left width="60%" bgColor=#ffffff><FONT size=2>Director</FONT>&nbsp; </TD>
      <TD noWrap align=left width="1%" bgColor=#ffffff></TD>
      <TD noWrap align=left width="15%" bgColor=#ffffff><FONT size=2>August 5,
        2009</FONT><FONT size=3>&nbsp; </FONT></TD></TR>
    <TR vAlign=bottom>
      <TD noWrap align=center width="22%" bgColor=#ffffff><FONT face=serif size=2>(Edward M. Esber, Jr.)</FONT>&nbsp;</TD>
      <TD noWrap align=left width="1%" bgColor=#ffffff></TD>
      <TD noWrap align=left width="60%" bgColor=#ffffff></TD>
      <TD noWrap align=right width="1%" bgColor=#ffffff></TD>
      <TD noWrap align=left width="15%" bgColor=#ffffff><FONT face=serif size=2><FONT size=3></FONT></FONT></TD></TR>
    <TR vAlign=bottom>
      <TD style="BORDER-BOTTOM: #000000 1pt solid" noWrap align=left width="22%" bgColor=#ffffff><FONT size=2>/s/</FONT>&nbsp;<FONT face=serif size=2>Elizabeth A. Fetter</FONT>&nbsp; </TD>
      <TD noWrap align=left width="1%" bgColor=#ffffff></TD>
      <TD noWrap align=left width="60%" bgColor=#ffffff><FONT face=serif size=2>Director</FONT>&nbsp; </TD>
      <TD noWrap align=right width="1%" bgColor=#ffffff></TD>
      <TD noWrap align=left width="15%" bgColor=#ffffff><FONT face=serif size=2>August 5, 2009<FONT size=3>&nbsp; </FONT></FONT></TD></TR>
    <TR vAlign=bottom>
      <TD noWrap align=center width="22%" bgColor=#ffffff><FONT face=serif size=2>(Elizabeth A. Fetter)</FONT>&nbsp;</TD>
      <TD noWrap align=left width="1%" bgColor=#ffffff></TD>
      <TD noWrap align=left width="60%" bgColor=#ffffff>&nbsp; </TD>
      <TD noWrap align=left width="1%" bgColor=#ffffff></TD>
      <TD noWrap align=left width="15%" bgColor=#ffffff>&nbsp; </TD></TR>
    <TR vAlign=bottom>
      <TD style="BORDER-BOTTOM: #000000 1pt solid" noWrap align=left width="22%" bgColor=#ffffff><FONT size=2>/s/</FONT>&nbsp;<FONT face=serif size=2>Joseph A. Marengi</FONT>&nbsp; </TD>
      <TD noWrap align=left width="1%" bgColor=#ffffff></TD>
      <TD noWrap align=left width="60%" bgColor=#ffffff><FONT size=2>Director</FONT>&nbsp; </TD>
      <TD noWrap align=left width="1%" bgColor=#ffffff></TD>
      <TD noWrap align=left width="15%" bgColor=#ffffff><FONT size=2>August 5,
        2009</FONT><FONT size=3>&nbsp; </FONT></TD></TR>
    <TR vAlign=bottom>
      <TD noWrap align=center width="22%" bgColor=#ffffff><FONT face=serif size=2>(Joseph A. Marengi)</FONT>&nbsp;</TD>
      <TD noWrap align=left width="1%" bgColor=#ffffff></TD>
      <TD noWrap align=left width="60%" bgColor=#ffffff></TD>
      <TD noWrap align=right width="1%" bgColor=#ffffff></TD>
      <TD noWrap align=left width="15%" bgColor=#ffffff><FONT face=serif size=2><FONT size=3></FONT></FONT></TD></TR>
    <TR vAlign=bottom>
      <TD style="BORDER-BOTTOM: #000000 1pt solid" noWrap align=left width="22%" bgColor=#ffffff><FONT size=2>/s/</FONT>&nbsp;<FONT face=serif size=2>Bruce
        A. Pasternack</FONT>&nbsp; </TD>
      <TD noWrap align=left width="1%" bgColor=#ffffff></TD>
      <TD noWrap align=left width="60%" bgColor=#ffffff><FONT size=2>Director</FONT>&nbsp; </TD>
      <TD noWrap align=left width="1%" bgColor=#ffffff></TD>
      <TD noWrap align=left width="15%" bgColor=#ffffff><FONT size=2>August 5,
        2009</FONT><FONT size=3>&nbsp; </FONT></TD></TR>
    <TR vAlign=bottom>
      <TD noWrap align=center width="22%" bgColor=#ffffff><FONT face=serif size=2>(Bruce A. Pasternack)</FONT>&nbsp;</TD>
      <TD noWrap align=left width="1%" bgColor=#ffffff></TD>
      <TD noWrap align=left width="60%" bgColor=#ffffff></TD>
      <TD noWrap align=right width="1%" bgColor=#ffffff></TD>
      <TD noWrap align=left width="15%" bgColor=#ffffff><FONT face=serif size=2><FONT size=3></FONT></FONT></TD></TR>
    <TR vAlign=bottom>
      <TD style="BORDER-BOTTOM: #000000 1pt solid" noWrap align=left width="22%"><FONT size=2>/s/</FONT>&nbsp;<FONT face=serif size=2>Dennis P.
        Wolf</FONT>&nbsp; </TD>
      <TD noWrap align=left width="1%"></TD>
      <TD noWrap align=left width="60%"><FONT face=serif size=2>Director</FONT>&nbsp; </TD>
      <TD noWrap align=right width="1%"></TD>
      <TD noWrap align=left width="15%"><FONT face=serif size=2>August 5,
        2009<FONT size=3>&nbsp; </FONT></FONT></TD></TR>
    <TR vAlign=bottom>
      <TD noWrap align=center width="22%"><FONT face=serif size=2>(Dennis P.
        Wolf)</FONT>&nbsp;</TD>
      <TD noWrap align=left width="1%"></TD>
      <TD noWrap align=left width="60%">&nbsp; </TD>
      <TD noWrap align=left width="1%"></TD>
      <TD noWrap align=left width="15%">&nbsp;
  </TD></TR></TABLE>
  <P align=center><FONT face=serif size=2>II-6 </FONT></P>
  <HR align=center width="100%" noShade SIZE=2>
  <PAGE>
  
  <P align=center><FONT face=serif size=2>INDEX TO EXHIBITS </FONT></P>
  <TABLE cellSpacing=0 cellPadding=0 width="100%" border=0>
  
    <TR vAlign=bottom>
      <TD vAlign=top noWrap align=center width="1%"><FONT face=serif size=2><FONT size=3>&nbsp;</FONT><STRONG>Exhibit</STRONG></FONT> </TD>
      <TD vAlign=top noWrap align=center width="1%" >&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
      <TD vAlign=top align=left width="97%"></TD></TR>
    <TR vAlign=bottom>
      <TD style="BORDER-BOTTOM: #000000 1pt solid" vAlign=top noWrap align=center width="1%"><FONT face=serif size=2><FONT size=3>&nbsp;&nbsp;
        </FONT><STRONG>Number</STRONG></FONT>&nbsp;&nbsp; </TD>
      <TD vAlign=top noWrap align=center width="1%" ></TD>
      <TD style="BORDER-BOTTOM: #000000 1pt solid" vAlign=top align=center width="97%"><B><FONT face=serif size=2>Description</FONT></B>&nbsp;</TD></TR>
    <TR vAlign=bottom>
      <TD vAlign=top noWrap align=center width="1%" bgColor=#c0c0c0><FONT face=serif size=2>4.1</FONT></TD>
      <TD vAlign=top noWrap align=center width="1%"  bgColor=#c0c0c0></TD>
      <TD vAlign=top align=left width="97%" bgColor=#c0c0c0><FONT face=serif size=2>ADIC-Rocksoft Employee Retention Pool Share
    Plan</FONT></TD></TR>
    <TR>
      <TD vAlign=top noWrap align=center width="1%" ></TD>
      <TD vAlign=top noWrap align=center width="1%" ></TD>
      <TD vAlign=top align=left width="97%" >&nbsp; </TD></TR>
    <TR vAlign=bottom>
      <TD vAlign=top noWrap align=center width="1%" bgColor=#c0c0c0><FONT face=serif size=2>5.1</FONT></TD>
      <TD vAlign=top noWrap align=center width="1%"  bgColor=#c0c0c0></TD>
      <TD vAlign=top align=left width="97%" bgColor=#c0c0c0><FONT face=serif size=2>Opinion regarding legality of Wilson Sonsini Goodrich
        &amp; Rosati, P.C.</FONT></TD></TR>
    <TR vAlign=bottom>
      <TD vAlign=top noWrap align=left width="1%"></TD>
      <TD vAlign=top noWrap align=left width="1%" >&nbsp;</TD>
      <TD vAlign=top align=left width="97%"><FONT face=serif size=2>&nbsp; </FONT></TD></TR>
    <TR vAlign=bottom>
      <TD vAlign=top noWrap align=center width="1%" bgColor=#c0c0c0><FONT face=serif size=2>23.1</FONT></TD>
      <TD vAlign=top noWrap align=center width="1%"  bgColor=#c0c0c0></TD>
      <TD vAlign=top align=left width="97%" bgColor=#c0c0c0><FONT face=serif size=2>Consent of PricewaterhouseCoopers LLP</FONT></TD></TR>
    <TR>
      <TD vAlign=top noWrap align=center width="1%" ></TD>
      <TD vAlign=top noWrap align=center width="1%" ></TD>
      <TD vAlign=top align=left width="97%" >&nbsp; </TD></TR>
    <TR vAlign=bottom>
      <TD vAlign=top noWrap align=center width="1%" bgColor=#c0c0c0><FONT face=serif size=2>23.2</FONT></TD>
      <TD vAlign=top noWrap align=center width="1%"  bgColor=#c0c0c0></TD>
      <TD vAlign=top align=left width="97%" bgColor=#c0c0c0><FONT face=serif size=2>Consent of Ernst &amp; Young LLP</FONT></TD></TR>
    <TR>
      <TD vAlign=top noWrap align=center width="1%" ></TD>
      <TD vAlign=top noWrap align=center width="1%" ></TD>
      <TD vAlign=top align=left width="97%" >&nbsp; </TD></TR>
    <TR vAlign=bottom>
      <TD vAlign=top noWrap align=center width="1%" bgColor=#c0c0c0><FONT face=serif size=2>23.3</FONT></TD>
      <TD vAlign=top noWrap align=center width="1%"  bgColor=#c0c0c0></TD>
      <TD vAlign=top align=left width="97%" bgColor=#c0c0c0><FONT face=serif size=2>Consent of Wilson Sonsini Goodrich &amp; Rosati, P.C.
        (included in Exhibit 5.1)</FONT></TD></TR>
    <TR vAlign=bottom>
      <TD vAlign=top noWrap align=left width="1%"></TD>
      <TD vAlign=top noWrap align=left width="1%" ></TD>
      <TD vAlign=top align=left width="97%"><FONT face=serif size=2>&nbsp;</FONT></TD></TR>
    <TR vAlign=bottom>
      <TD vAlign=top noWrap align=center width="1%" bgColor=#c0c0c0><FONT face=serif size=2>24.1</FONT></TD>
      <TD vAlign=top noWrap align=center width="1%"  bgColor=#c0c0c0></TD>
      <TD vAlign=top align=left width="97%" bgColor=#c0c0c0><FONT face=serif size=2>Power
        of Attorney (see page II-6)</FONT></TD></TR></TABLE><BR>
  
  
  <P align=center><FONT face=serif size=2>II-7</FONT></P>
  
  <HR align=center width="100%" noShade SIZE=2>
  </BODY>
  
  </HTML>
metadata_documents: [{"type": "S-8", "sequence": "1", "filename": "quantum_s-8.htm", "description": "INITIAL REGISTRATION STATEMENT FOR SECURITIES TO BE OFFERED TO EMPLOYEES", "secsgml_size_bytes": 53407}]
metadata_filer: {"company-data": {"conformed-name": "QUANTUM CORP /DE/", "cik": "0000709283", "assigned-sic": "3572", "irs-number": "942665054", "state-of-incorporation": "DE", "fiscal-year-end": "0331"}, "filing-values": {"form-type": "S-8", "act": "33", "file-number": "333-161060", "film-number": "09988715"}, "business-address": {"street1": "1650 TECHNOLOGY DRIVE", "street2": "SUITE 700", "city": "SAN JOSE", "state": "CA", "zip": "95110", "phone": "408 944 4000"}, "mail-address": {"street1": "1650 TECHNOLOGY DRIVE", "street2": "SUITE 700", "city": "SAN JOSE", "state": "CA", "zip": "95110"}}
text: As
        filed with the Securities and Exchange Commission on August 5, 2009
  Registration No. 333-_____
  UNITED STATES
  SECURITIES AND EXCHANGE COMMISSION
  Washington, D.C.
  20549
  ____________________
  FORM
  S-8
  REGISTRATION
  STATEMENT
  Under
  The Securities Act of
  1933
  ____________________
  QUANTUM CORPORATION
  (Exact name
  of issuer as specified in its charter)
  ____________________
  DELAWARE
  94-2665054
  (State of
        incorporation)
  (I.R.S.
        Employer
  Identification Number)
  1650 Technology Drive, Suite
  800
  San Jose, California 95110
  (Address of principal executive offices)
  ____________________
  ADIC-Rocksoft Employee Retention Pool Share
  Plan
  (Full title of the plan(s))
  ____________________
  Shawn D. Hall
  Sr. Vice President, General Counsel and Secretary
  Quantum
  Corporation
  1650 Technology Drive, Suite 800
  San Jose, California
  95110
  (Name and address of agent for
  service)
  (408)
  944-4000
  (Telephone number, including
  area code, of agent for service)
  ____________________
  Copy to:
  Steven E. Bochner, Esq.
  WILSON SONSINI GOODRICH & ROSATI
  Professional Corporation
  650
  Page Mill Road
  Palo Alto, California
  94304-1050
  ____________________
  Indicate by check mark whether the
  registrant is a large accelerated filer, an accelerated filer, a non-accelerated
  filer, or a smaller reporting company. See the definitions of "large accelerated
  filer," "accelerated filer" and "smaller reporting company" in Rule 12b-2 of the
  Exchange Act.
  Large accelerated filer
  o
  Accelerated
        filer
  þ
  Non-accelerated
        filer
  o
  (Do not check if a
        smaller reporting company)
  Smaller reporting
        company
  o
  CALCULATION OF REGISTRATION FEE
  Proposed
  Proposed
  Amount
  Maximum
  Maximum
  Amount of
  to
        be
  Offering
        Price
  Aggregate
  Registration
  Title of Securities to be
        Registered
  Registered
  Per Share
  Offering Price
  Fee
  QTM Common Stock, par value $0.01 per share,
  issuable under the ADIC-Rocksoft Employee
  940,000 shares
  $0.92
  $864,800
  (1)
  $48.26
  (2)
  Retention Pool Share Plan
  Total:
  940,000 shares
  $0.92
  $864,800
  $48.26
  (1)
  Estimated solely for the purpose
        of calculating the amount of the registration fee pursuant to Rules 457(c)
        and (h) under the Securities Act of 1933, as amended (the "Securities
        Act") on the basis of $0.92 per share, the average of the high and low
        prices per share of the Registrant's QTM Common Stock on August 3, 2009,
        as reported on the New York Stock Exchange.
  (2)
  Amount of the Registration Fee
        was calculated pursuant to Section 6(b) of the Securities Act and was
        determined by multiplying the proposed maximum aggregate offering price by
        0.00005580.
  QUANTUM CORPORATION
  REGISTRATION STATEMENT ON FORM S-8
  PART II
  INFORMATION REQUIRED IN REGISTRATION
  STATEMENT
  ITEM 3.
  Incorporation of Documents by Reference
  .
  The
  following documents and information filed with the Securities and Exchange
  Commission (the "Commission") are hereby incorporated by reference in this
  Registration Statement of Quantum Corporation (referred to herein as the
  "Registrant"):
  (a)
  The Registrant's Annual Report on Form 10-K for the fiscal
  year ended March 31, 2009, filed with the Commission pursuant to Section 13 of
  the Securities Exchange Act of 1934, as amended (the "Exchange Act"), on June
  30, 2009;
  (b)
  The Registrant's Current Reports on Form 8-K filed with the
  Commission dated April 15, 2009 (filed April 16, 2009), dated June 3, 2009
  (filed June 9, 2009), dated June 3, 2009 (filed June 9, 2009), dated June 17,
  2009 (filed June 23, 2009), dated June 19, 2009 (filed June 23, 2009) and dated
  July 1, 2009 (filed July 1, 2009); and
  (c)
  The description of the Registrant's Common Stock contained in
  the Registrant's Registration Statement on Form 8-A filed with the Commission on
  July 21, 1999 pursuant to Section 12(b) of the Exchange Act and any amendment or
  report filed for the purpose of updating any such description.
  All
  documents filed by the Registrant pursuant to Sections 13(a), 13(c), 14 and
  15(d) of the Exchange Act on or after the date of this Registration Statement
  and prior to the filing of a post-effective amendment to this Registration
  Statement which indicates that all securities offered pursuant to this
  Registration Statement have been sold or which deregisters all securities then
  remaining unsold shall be deemed to be incorporated by reference in this
  Registration Statement and to be part hereof from the date of filing of such
  documents. Any statement contained in a document incorporated or deemed to be
  incorporated by reference in this Registration Statement shall be deemed to be
  modified or superseded for purposes of this Registration Statement to the extent
  that a statement contained herein modifies or supersedes such statement. Any
  such statement so modified or superseded shall not be deemed, except as so
  modified or superseded, to constitute a part of this Registration Statement.
  ITEM 4.
  Description of Securities
  .
  Inapplicable.
  ITEM 5.
  Interests of Named Experts and Counsel
  .
  Inapplicable.
  II-1
  ITEM 6.
  Indemnification of Directors and Officers
  .
  Section
  145 of the Delaware General Corporation Law authorizes a court to award, or a
  corporation's Board of Directors to grant, indemnification to directors and
  officers in terms sufficiently broad to permit such indemnification under
  certain circumstances for liabilities (including reimbursement for expenses
  incurred) arising under the Securities Act of 1933, as amended (the "Securities
  Act"). The Registrant's Amended and Restated Certificate of Incorporation
  contains a provision eliminating the personal liability of the Registrant's
  directors to the Registrant or its stockholders for breach of fiduciary duty as
  a director to the fullest extent permitted by applicable law. The Registrant's
  Bylaws, as amended, provide for the indemnification of its directors, officers,
  employees and other agents to the maximum extent permitted by Delaware General
  Corporation Law, and the Registrant has entered into agreements with its
  officers, directors and certain key employees implementing such indemnification.
  ITEM 7.
  Exemption from Registration Claimed
  .
  Inapplicable.
  ITEM 8.
  Exhibits
  .
  Exhibit
  Number
  Description
  4.1
  ADIC-Rocksoft Employee Retention Pool Share Plan
  5.1
  Opinion
        regarding legality of Wilson Sonsini Goodrich & Rosati,
    P.C.
  23.1
  Consent
        of PricewaterhouseCoopers LLP
  23.2
  Consent
        of Ernst & Young LLP
  23.3
  Consent
        of Wilson Sonsini Goodrich & Rosati, P.C. (included in Exhibit
        5.1)
  24.1
  Power
        of Attorney (see page II-6)
  ITEM 9.
  Undertakings
  .
  A.
  The undersigned Registrant hereby undertakes:
  (1) To file, during any period in which offers or sales are
  being made, a post-effective amendment to this Registration
  Statement:
  (i) To include any prospectus
  required by Section 10(a)(3) of the Securities Act;
  (ii) To reflect in the prospectus any facts or events arising
  after the effective date of the Registration Statement (or the most recent
  post-effective amendment thereof) which, individually or in the aggregate,
  represent a fundamental change in the information set forth in the Registration
  Statement. Notwithstanding the foregoing, any increase or decrease in volume of
  securities offered (if the total dollar value of securities offered would not
  exceed that which was registered) and any deviation from the low or high end of
  the estimated maximum offering range may be reflected in the form of prospectus
  filed with the Commission pursuant to Rule 424(b) if, in the aggregate, the
  changes in volume and price represent no more than a 20 percent change in the
  maximum aggregate offering price set forth in the "Calculation of Registration
  Fee" table in the effective Registration Statement;
  II-2
  (iii) To include any material information with respect to the
  plan of distribution not previously disclosed in the Registration Statement or
  any material change to such information in the Registration
  Statement;
  provided,
  however,
  that paragraphs (a)(1)(i) and
  (a)(1)(ii) do not apply if the information required to be included in a
  post-effective amendment by those paragraphs is contained in reports filed with
  or furnished to the Commission by the Registrant pursuant to Section 13 or
  Section 15(d) of the Exchange Act that are incorporated by reference in the
  Registration Statement.
  (2) That, for the purpose of determining any liability under
  the Securities Act, each such post-effective amendment shall be deemed to be a
  new registration statement relating to the securities offered therein, and the
  offering of such securities at that time shall be deemed to be the initial
  bona fide
  offering thereof.
  (3) To remove from registration by means of a post-effective
  amendment any of the securities being registered which remain unsold at the
  termination of the offering.
  (4) That, for purposes of determining liability under the
  Securities Act to any purchaser, each prospectus filed pursuant to Rule 424(b)
  as part of a registration statement relating to an offering, other than
  registration statements relying on Rule 430B or other than prospectuses filed in
  reliance on Rule 430A, shall be deemed to be part of and included in the
  Registration Statement as of the date it is first used after effectiveness.
  Provided, however, that no statement made in a registration statement or
  prospectus that is part of the Registration Statement or made in a document
  incorporated or deemed incorporated by reference into the Registration Statement
  or prospectus that is part of the Registration Statement will, as to a purchaser
  with a time of contract of sale prior to such first use, supersede or modify any
  statement that was made in the Registration Statement or prospectus that was
  part of the Registration Statement or made in any such document immediately
  prior to such date of first use.
  (5) That, for the purpose of determining liability of the
  Registrant under the Securities Act to any purchaser in the initial distribution
  of the securities, in a primary offering of securities of the undersigned
  Registrant pursuant to this Registration Statement, regardless of the
  underwriting method used to sell the securities to the purchaser, if the
  securities are offered or sold to such purchaser by means of any of the
  following communications, the undersigned Registrant will be a seller to the
  purchaser and will be considered to offer or sell such securities to such
  purchaser: (i) Any preliminary prospectus or prospectus of the undersigned
  Registrant relating to the offering required to be filed pursuant to Rule 424;
  (ii) Any free writing prospectus relating to the offering prepared by or on
  behalf of the undersigned Registrant or used or referred to by the undersigned
  Registrant; (iii) The portion of any other free writing prospectus relating to
  the offering containing material information about the undersigned Registrant or
  its securities provided by or on behalf of the undersigned Registrant; and (iv)
  Any other communication that is an offer in the offering made by the undersigned
  Registrant to the purchaser.
  B. The
  undersigned Registrant hereby undertakes that, for purposes of determining any
  liability under the Securities Act, each filing of the Registrant's annual
  report pursuant to Section 13(a) or Section 15(d) of the Exchange Act (and,
  where applicable, each filing of an employee benefit plan's annual report
  pursuant to Section 15(d) of the Exchange Act) that is incorporated by reference
  in the registration statement shall be deemed to be a new registration statement
  relating to the securities offered therein, and the offering of such securities
  at that time shall be deemed to be the initial bona fide offering thereof.
  II-3
  C.
  Insofar as indemnification for liabilities arising under the Securities Act may
  be permitted to directors, officers and controlling persons of the Registrant
  pursuant to the foregoing provisions, or otherwise, the Registrant has been
  advised that in the opinion of the Commission such indemnification is against
  public policy as expressed in the Securities Act and is, therefore,
  unenforceable. In the event that a claim for indemnification against such
  liabilities (other than the payment by the Registrant of expenses incurred or
  paid by a director, officer or controlling person of the Registrant in
  successful defense of any action, suit or proceeding) is asserted by such
  director, officer or controlling person in connection with the securities being
  registered hereunder, the Registrant will, unless in the opinion of its counsel
  the matter has been settled by controlling precedent, submit to a court of
  appropriate jurisdiction the question of whether such indemnification by it is
  against public policy as expressed in the Securities Act and will be governed by
  the final adjudication of such issue.
  II-4
  SIGNATURES
  Pursuant
  to the requirements of the Securities Act, as amended, the Registrant, Quantum
  Corporation, a corporation organized and existing under the laws of the State of
  Delaware, certifies that it has reasonable grounds to believe that it meets all
  of the requirements for filing on Form S-8 and has duly caused this Registration
  Statement to be signed on its behalf by the undersigned, thereunto duly
  authorized, in the City of San Jose, State of California, on this 5
  th
  day of August, 2009.
  QUANTUM CORPORATION
  By:
  /s/ Shawn D. Hall
  Shawn D.
        Hall
  Senior Vice
        President, General Counsel and Secretary
  II-5
  POWER OF ATTORNEY
  KNOW ALL
  PERSONS BY THESE PRESENTS, that each person whose signature appears below
  constitutes and appoints Richard E. Belluzzo and Shawn D. Hall, jointly and
  severally, his or her attorneys-in-fact, each with the power of substitution,
  for him or her in any and all capacities, to sign any and all amendments to this
  Registration Statement on Form S-8 (including post-effective amendments), and to
  file the same, with exhibits thereto and other documents in connection
  therewith, with the Securities and Exchange Commission, hereby ratifying and
  confirming all that each of said attorneys-in-fact, or his substitute or
  substitutes, may do or cause to be done by virtue hereof.
  Pursuant
  to the requirements of the Securities Act, this Registration Statement has been
  signed by the following persons in the capacities and on the dates
  indicated:
  Signature
  Title
  Date
  /s/
  Richard E. Belluzzo
  Chief
        Executive Officer and Chairman of the Board (Principal Executive
        Officer)
  August 5, 2009
  (Richard E. Belluzzo)
  /s/
  Jon W. Gacek
  Executive Vice President, Chief Financial Officer and Chief
        Operating Officer
  August 5, 2009
  (Jon W.
        Gacek)
  (Principal Financial Officer and Principal Accounting
        Officer)
  /s/ Paul R. Auvil,
        III
  Director
  August 5,
        2009
  (Paul R. Auvil, III)
  /s/
  Michael A. Brown
  Director
  August 5, 2009
  (Michael A. Brown)
  /s/
  Thomas S. Buchsbaum
  Director
  August 5, 2009
  (Thomas S. Buchsbaum)
  /s/
  Edward M. Esber, Jr.
  Director
  August 5,
        2009
  (Edward M. Esber, Jr.)
  /s/
  Elizabeth A. Fetter
  Director
  August 5, 2009
  (Elizabeth A. Fetter)
  /s/
  Joseph A. Marengi
  Director
  August 5,
        2009
  (Joseph A. Marengi)
  /s/
  Bruce
        A. Pasternack
  Director
  August 5,
        2009
  (Bruce A. Pasternack)
  /s/
  Dennis P.
        Wolf
  Director
  August 5,
        2009
  (Dennis P.
        Wolf)
  II-6
  INDEX TO EXHIBITS
  Exhibit
  Number
  Description
  4.1
  ADIC-Rocksoft Employee Retention Pool Share
    Plan
  5.1
  Opinion regarding legality of Wilson Sonsini Goodrich
        & Rosati, P.C.
  23.1
  Consent of PricewaterhouseCoopers LLP
  23.2
  Consent of Ernst & Young LLP
  23.3
  Consent of Wilson Sonsini Goodrich & Rosati, P.C.
        (included in Exhibit 5.1)
  24.1
  Power
        of Attorney (see page II-6)
  II-7