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<H5 align="left"><A HREF="#toc">Table of Contents</A></H5><P>

<P align="center"><B>As filed with the Securities and Exchange Commission on May&nbsp;17,
  2001</B>
<P align="right"><B>Registration No.&nbsp;333-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</B>
<hr size="4" noshade>
<hr size="1" noshade>
<P align="center"><B>SECURITIES AND EXCHANGE COMMISSION<BR>
  Washington, D.C. 20549<BR>
  ______________________</B>
<P align="center"><B>FORM S-8<BR>
  REGISTRATION STATEMENT<BR>
  UNDER<BR>
  THE SECURITIES ACT OF 1933<BR>
  ______________________</B>
<P align="center"><B>ADVANCED DIGITAL INFORMATION CORPORATION</B><BR>
  <font size="2">(Exact name of Registrant as specified in its charter)</font>
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      <TD width="45%">&nbsp;</TD>
      <TD width="10%">&nbsp;</TD>
      <TD width="45%">&nbsp;</TD>
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      <TD nowrap align="center"><FONT size="3"><B>Washington</B></FONT></TD>
      <TD></TD>
      <TD nowrap align="center"><FONT size="3"><B>91-1618616</B></FONT></TD>
    </TR>
    <TR valign="bottom">
      <TD valign="top">
        <DIV style="margin-left:10px; text-indent:-10px">
          <div align="center"><FONT size="2">(State or other jurisdiction of incorporation
            or organization)</FONT></div>
        </DIV>
      </TD>
      <TD></TD>
      <TD  align="left" valign="top">
        <DIV style="margin-left:10px; text-indent:-10px">
          <div align="center"><FONT size="2"> (I.R.S. Employer Identification
            No.)</FONT></div>
        </DIV>
      </TD>
    </TR>
  </TABLE>
</CENTER>
<P align="center"><B>P.O. Box 97057<BR>
  11431 Willows Road N.E.<BR>
  Redmond, Washington 98073-9757</B><BR>
  <font size="2">(Address of principal executive offices, including zip code)</font>
<P align="center"><B>Advanced Digital Information Corporation Outside Directors
  August&nbsp;2000 Stock Option Program</B>
<center><B>Advanced Digital Information Corporation Amended and Restated
  1999 Stock Incentive Compensation Plan</B></CENTER>
<center><B>1997 Stock Option Plan of Pathlight Technology,
Inc.</B></CENTER>
<center><font size="2">(Full title of the plans)</font></center>
<P align="center"><B>PETER H. VAN OPPEN<BR>
  Chief Executive Officer<BR>
  Advanced Digital Information Corporation<BR>
  P.O. Box 97057<BR>
  11431 Willows Road N.E.<BR>
  Redmond, Washington 98073-9757<BR>
  (425)&nbsp;881-8004</B><BR>
  <font size="2">(Name, address and telephone number, including area code, of
  agent for service)</font><BR>
  <B>______________________</B>
<P align="center"><B>Copy to:</B>
<P align="center"><B>SCOTT L. GELBAND<BR>
  Perkins Coie LLP<BR>
  505 Fifth Avenue South, Suite&nbsp;620<BR>
  Seattle, Washington 98104-3846</B>
<center><B>(206)&nbsp;287-3505</B></CENTER>
<P align="center"><B>CALCULATION OF REGISTRATION FEE</B>
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    <TD width="3%">&nbsp;</TD>
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    <TD width="50%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="6%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="6%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="7%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="6%">&nbsp;</TD>
  </TR>
  <TR valign="bottom">
    <TD nowrap align="center" colspan="3"><font size="1"><B>Title of Securities</B></font></TD>
    <TD><font size="1"></font></TD>
    <TD nowrap align="center" colspan="3"><font size="1"><B>Amount to Be</B></font></TD>
    <TD><font size="1"></font></TD>
    <TD nowrap align="center" colspan="3"><font size="1"><B>Proposed Maximum</B></font></TD>
    <TD><font size="1"></font></TD>
    <TD nowrap align="center" colspan="3"><font size="1"><B>Proposed Maximum</B></font></TD>
    <TD><font size="1"></font></TD>
    <TD nowrap align="center" colspan="3"><font size="1"><B>Amount of</B></font></TD>
  </TR>
  <TR valign="bottom">
    <TD nowrap align="center" colspan="3"><font size="1"><B>to Be Registered</B></font></TD>
    <TD><font size="1"></font></TD>
    <TD nowrap align="center" colspan="3"><font size="1"><B>Registered(1)</B></font></TD>
    <TD><font size="1"></font></TD>
    <TD nowrap align="center" colspan="3"><font size="1"><B>Offering Price Per
      Share</B></font></TD>
    <TD><font size="1"></font></TD>
    <TD nowrap align="center" colspan="3"><font size="1"><B>Aggregate Offering
      Price</B></font></TD>
    <TD><font size="1"></font></TD>
    <TD nowrap align="center" colspan="3"><font size="1"><B>Registration Fee</B></font></TD>
  </TR>
  <TR valign="bottom">
    <TD colspan="3">
      <HR size="1">
    </TD>
    <TD></TD>
    <TD colspan="3">
      <HR size="1">
    </TD>
    <TD></TD>
    <TD colspan="3">
      <HR size="1">
    </TD>
    <TD></TD>
    <TD colspan="3">
      <HR size="1">
    </TD>
    <TD></TD>
    <TD colspan="3">
      <HR size="1">
    </TD>
  </TR>
  <TR valign="bottom">
    <TD></TD>
    <TD colspan="2">
      <DIV style="margin-left:10px; text-indent:-10px"><FONT size="2"><b><font size="1">Common
        Stock, no par value, subject to outstanding options under the:</font></b></FONT></DIV>
    </TD>
    <TD></TD>
    <TD></TD>
    <TD>&nbsp; </TD>
    <TD></TD>
    <TD></TD>
    <TD></TD>
    <TD>&nbsp; </TD>
    <TD></TD>
    <TD></TD>
    <TD></TD>
    <TD>&nbsp; </TD>
    <TD></TD>
    <TD></TD>
    <TD></TD>
    <TD>&nbsp; </TD>
    <TD></TD>
  </TR>
  <TR>
    <TD>
  <TR>
    <TD>
  <TR>
    <TD>
  <TR>
    <TD>
  <TR>
    <TD>
  <TR>
    <TD>
  <TR>
    <TD>
  <TR>
    <TD>
  <TR>
    <TD>
  <TR>
    <TD>
  <TR>
    <TD>
  <TR valign="bottom">
    <TD></TD>
    <TD colspan="2">
      <DIV style="margin-left:10px; text-indent:-10px"><FONT size="2"></FONT></DIV>
    </TD>
  </TR>
  <TR>
    <TD>
  <TR>
    <TD>
  <TR>
    <TD>
  <TR>
    <TD>
  <TR valign="bottom">
    <TD></TD>
    <TD colspan="2">
      <DIV style="margin-left:10px; text-indent:-10px"><FONT size="2"><B><font size="1">Outside
        Directors August&nbsp;2000 Stock Option Program</font></B></FONT></DIV>
    </TD>
    <TD></TD>
    <TD align="right"></TD>
    <TD align="right"><font size="1"><B>21,600</B></font></TD>
    <TD><font size="1"></font></TD>
    <TD><font size="1"></font></TD>
    <TD nowrap align="right"><font size="1"><B>$</B></font></TD>
    <TD align="right"><font size="1"><B>12.7815</B></font></TD>
    <TD nowrap><font size="1"><B>(2)</B></font></TD>
    <TD><font size="1"></font></TD>
    <TD align="right"><font size="1"><B>$</B></font></TD>
    <TD align="right"><font size="1"><B>276,080.40</B></font></TD>
    <TD><font size="1"></font></TD>
    <TD><font size="1"></font></TD>
    <TD align="right"><font size="1"><B>$</B></font></TD>
    <TD align="right"><font size="1"><B>69.02</B></font></TD>
    <TD></TD>
  </TR>
  <TR valign="bottom">
    <TD colspan="3">
      <DIV style="margin-left:10px; text-indent:-10px"></DIV>
    </TD>
    <TD></TD>
    <TD></TD>
    <TD>
      <HR size="1">
    </TD>
    <TD></TD>
    <TD></TD>
    <TD></TD>
    <TD>
      <HR size="1">
    </TD>
    <TD></TD>
    <TD></TD>
    <TD></TD>
    <TD>
      <HR size="1">
    </TD>
    <TD></TD>
    <TD></TD>
    <TD></TD>
    <TD>
      <HR size="1">
    </TD>
    <TD></TD>
  </TR>
  <TR>
    <TD>
  <TR>
    <TD>
  <TR>
    <TD>
  <TR>
    <TD>
  <TR>
    <TD>
  <TR>
    <TD>
  <TR>
    <TD>
  <TR>
    <TD>
  <TR>
    <TD>
  <TR>
    <TD>
  <TR>
    <TD>
  <TR>
    <TD>
  <TR valign="bottom">
    <TD></TD>
    <TD colspan="2">
      <DIV style="margin-left:10px; text-indent:-10px"><FONT size="2"></FONT></DIV>
    </TD>
  </TR>
  <TR>
    <TD>
  <TR>
    <TD>
  <TR>
    <TD>
  <TR>
    <TD>
  <TR valign="bottom">
    <TD></TD>
    <TD colspan="2">
      <DIV style="margin-left:10px; text-indent:-10px"><FONT size="2"><B><font size="1">1997
        Stock Option Plan of Pathlight Technology, Inc.</font></B></FONT></DIV>
    </TD>
    <TD></TD>
    <TD nowrap align="right"></TD>
    <TD align="right"><font size="1"><B>520,502</B></font></TD>
    <TD nowrap><font size="1"><B>(3)</B></font></TD>
    <TD><font size="1"></font></TD>
    <TD nowrap align="right"><font size="1"><B>$</B></font></TD>
    <TD align="right"><font size="1"><B>1.399</B></font></TD>
    <TD nowrap><font size="1"><B>(4)</B></font></TD>
    <TD><font size="1"></font></TD>
    <TD align="right"><font size="1"><B>$</B></font></TD>
    <TD align="right"><font size="1"><B>728,182.30</B></font></TD>
    <TD><font size="1"></font></TD>
    <TD><font size="1"></font></TD>
    <TD align="right"><font size="1"><B>$</B></font></TD>
    <TD align="right"><font size="1"><B>182.05</B></font></TD>
    <TD></TD>
  </TR>
  <TR valign="top">
    <TD colspan="3" height="18">
      <DIV style="margin-left:10px; text-indent:-10px"></DIV>
    </TD>
    <TD height="18"></TD>
    <TD height="18"></TD>
    <TD height="18">
      <HR size="1">
    </TD>
    <TD height="18"></TD>
    <TD height="18"></TD>
    <TD height="18"></TD>
    <TD height="18">
      <HR size="1">
    </TD>
    <TD height="18"></TD>
    <TD height="18"></TD>
    <TD height="18"></TD>
    <TD height="18">
      <HR size="1">
    </TD>
    <TD height="18"></TD>
    <TD height="18"></TD>
    <TD height="18"></TD>
    <TD height="18">
      <HR size="1">
    </TD>
    <TD height="18"></TD>
  </TR>
  <TR valign="bottom">
    <TD colspan="3">
      <DIV style="margin-left:10px; text-indent:-10px"><FONT size="2"><B><font size="1">Common
        Stock, no par value, authorized but not subject to outstanding options
        or subject to prior registration under the:</font></B></FONT></DIV>
    </TD>
  </TR>
  <TR valign="bottom">
    <TD></TD>
    <TD colspan="2">
      <DIV style="margin-left:10px; text-indent:-10px"><FONT size="2"></FONT></DIV>
    </TD>
    <TD></TD>
    <TD></TD>
    <TD>&nbsp; </TD>
    <TD></TD>
    <TD></TD>
    <TD></TD>
    <TD>&nbsp; </TD>
    <TD></TD>
    <TD></TD>
    <TD></TD>
    <TD>&nbsp; </TD>
    <TD></TD>
    <TD></TD>
    <TD></TD>
    <TD>&nbsp; </TD>
    <TD></TD>
  </TR>
  <TR>
    <TD>
  <TR>
    <TD>
  <TR>
    <TD>
  <TR>
    <TD>
  <TR>
    <TD>
  <TR>
    <TD>
  <TR>
    <TD>
  <TR>
    <TD>
  <TR>
    <TD>
  <TR>
    <TD>
  <TR>
    <TD>
  <TR>
    <TD>
  <TR valign="bottom">
    <TD></TD>
    <TD colspan="2">
      <DIV style="margin-left:10px; text-indent:-10px"><FONT size="2"></FONT></DIV>
    </TD>
  </TR>
  <TR>
    <TD>
  <TR>
    <TD>
  <TR>
    <TD>
  <TR>
    <TD>
  <TR valign="bottom">
    <TD></TD>
    <TD colspan="2">
      <DIV style="margin-left:10px; text-indent:-10px"><FONT size="2"><B><font size="1">Amended
        and Restated 1999 Stock Incentive Compensation Plan</font></B></FONT></DIV>
    </TD>
    <TD></TD>
    <TD align="right"></TD>
    <TD align="right"><font size="1"><B>2,000,000</B></font></TD>
    <TD><font size="1"></font></TD>
    <TD><font size="1"></font></TD>
    <TD nowrap align="right"><font size="1"><B>$</B></font></TD>
    <TD align="right"><font size="1"><B>22.015</B></font></TD>
    <TD nowrap><font size="1"><B>(5)</B></font></TD>
    <TD><font size="1"></font></TD>
    <TD align="right"><font size="1"><B>$</B></font></TD>
    <TD align="right"><font size="1"><B>44,030,000.00</B></font></TD>
    <TD><font size="1"></font></TD>
    <TD><font size="1"></font></TD>
    <TD align="right"><font size="1"><B>$</B></font></TD>
    <TD align="right"><font size="1"><B>11,007.50</B></font></TD>
    <TD></TD>
  </TR>
  <TR valign="bottom">
    <TD colspan="3">
      <DIV style="margin-left:10px; text-indent:-10px"></DIV>
    </TD>
    <TD></TD>
    <TD></TD>
    <TD>
      <HR size="1">
    </TD>
    <TD></TD>
    <TD></TD>
    <TD></TD>
    <TD>
      <HR size="1">
    </TD>
    <TD></TD>
    <TD></TD>
    <TD></TD>
    <TD>
      <HR size="1">
    </TD>
    <TD></TD>
    <TD></TD>
    <TD></TD>
    <TD>
      <HR size="1">
    </TD>
    <TD></TD>
  </TR>
  <TR valign="bottom">
    <TD></TD>
    <TD></TD>
    <TD>
      <DIV style="margin-left:10px; text-indent:-10px"><FONT size="2"><B><font size="1">TOTAL:</font></B></FONT></DIV>
    </TD>
    <TD></TD>
    <TD align="right"></TD>
    <TD align="right"><font size="1"><B>2,542,102</B></font></TD>
    <TD><font size="1"></font></TD>
    <TD><font size="1"></font></TD>
    <TD align="right"><font size="1"></font></TD>
    <TD align="right"><font size="1"></font></TD>
    <TD><font size="1"></font></TD>
    <TD><font size="1"></font></TD>
    <TD align="right"><font size="1"><B>$</B></font></TD>
    <TD align="right"><font size="1"><B>45,034,262.70</B></font></TD>
    <TD><font size="1"></font></TD>
    <TD><font size="1"></font></TD>
    <TD align="right"><font size="1"><B>$</B></font></TD>
    <TD align="right"><font size="1"><B>11,258.57</B></font></TD>
    <TD></TD>
  </TR>
  <TR valign="bottom">
    <TD colspan="3">
      <DIV style="margin-left:10px; text-indent:-10px"></DIV>
    </TD>
    <TD></TD>
    <TD></TD>
    <TD>
      <HR size="4" noshade>
    </TD>
    <TD></TD>
    <TD></TD>
    <TD></TD>
    <TD></TD>
    <TD></TD>
    <TD></TD>
    <TD></TD>
    <TD>
      <HR size="4" noshade>
    </TD>
    <TD></TD>
    <TD></TD>
    <TD></TD>
    <TD>
      <HR size="4" noshade>
    </TD>
    <TD></TD>
  </TR>
</TABLE>

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<P align="center">

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<P><HR noshade><P>
<H5 align="left"><A HREF="#toc">Table of Contents</A></H5><P>

<P>
<HR size="2" width="10%" align="left" noshade>
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0">
  <TR valign="top">
    <TD width="1%" align="left">(1)</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="96%">Together with an indeterminate number of additional shares
      which may be necessary to adjust the number of shares reserved for issuance
      pursuant to the plans as the result of any future stock split, stock dividend
      or similar adjustment of the Registrant&#146;s outstanding Common Stock.</TD>
  </TR>
  <TR>
    <TD>
  <TR>
    <TD>
  <TR>
    <TD>
  <TR>
    <TD>
  <TR valign="top">
    <TD width="1%" align="left">(2)</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="96%">Computed pursuant to Rule&nbsp;457(h) under the Securities
      Act of 1933, as amended. The proposed maximum offering price of $12.7815
      represents the exercise price for each currently outstanding option grant.</TD>
  </TR>
  <TR>
    <TD>
  <TR>
    <TD>
  <TR>
    <TD>
  <TR>
    <TD>
  <TR valign="top">
    <TD width="1%" align="left">(3)</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="96%">Pursuant to an Agreement and Plan of Merger among the Registrant,
      PTech Acquisition, Inc. and Pathlight Technology, Inc. (&#147;Pathlight&#148;)
      dated as of January&nbsp;30, 2001 (the &#147;Merger Agreement&#148;), the
      Registrant assumed the outstanding options to purchase common stock of Pathlight,
      under its 1997 Stock Option Plan (the &#147;Pathlight Assumed Options&#148;),
      with appropriate adjustments to the number of shares and the exercise price
      of each Pathlight Assumed Option to reflect the ratio at which Pathlight
      common stock was converted into common stock of the Registrant under the
      Merger Agreement.</TD>
  </TR>
  <TR>
    <TD>
  <TR>
    <TD>
  <TR>
    <TD>
  <TR>
    <TD>
  <TR valign="top">
    <TD width="1%" align="left">(4)</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="96%">Shares are issuable upon exercise of outstanding options with
      fixed exercise prices. Pursuant to Rule&nbsp;457(h) under the Securities
      Act of 1933, as amended, the proposed maximum aggregate offering price and
      the registration fee have been computed based on the weighted average exercise
      price for shares subject to outstanding options, which exercise prices range
      from $3.454 per share to $0.123 per share.</TD>
  </TR>
  <TR>
    <TD>
  <TR>
    <TD>
  <TR>
    <TD>
  <TR>
    <TD>
  <TR valign="top">
    <TD width="1%" align="left">(5)</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="96%">Estimated pursuant to Rule&nbsp;457(c) under the Securities
      Act of 1933, as amended, solely for the purpose of calculating the registration
      fee. The price per share under the plans is estimated to be $22.015 based
      on the average of the high ($23.25) and low ($20.78) sales prices for the
      Common Stock on May&nbsp;14, 2001 as reported by the Nasdaq National Market.</TD>
  </TR>
</TABLE>
<P align="center">
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<!-- TOC -->
<A name="toc"><DIV align="CENTER"><U><B>TABLE OF CONTENTS</B></U></DIV></A>

<P><CENTER>
<TABLE border="0" width="90%" cellpadding="0" cellspacing="0">
<TR>
	<TD width="3%"></TD>
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</TR>
<TR><TD colspan="9"><A HREF="#000">PART II</A></TD></TR>
<TR><TD></TD><TD colspan="8"><A HREF="#001">Item&nbsp;3. INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE</A></TD></TR>
<TR><TD></TD><TD colspan="8"><A HREF="#002">Item&nbsp;4. DESCRIPTION OF SECURITIES</A></TD></TR>
<TR><TD></TD><TD colspan="8"><A HREF="#003">Item&nbsp;5. INTERESTS OF NAMED EXPERTS AND COUNSEL</A></TD></TR>
<TR><TD></TD><TD colspan="8"><A HREF="#004">Item&nbsp;6. INDEMNIFICATION OF DIRECTORS AND OFFICERS</A></TD></TR>
<TR><TD></TD><TD colspan="8"><A HREF="#005">Item&nbsp;7. EXEMPTION FROM REGISTRATION CLAIMED</A></TD></TR>
<TR><TD></TD><TD colspan="8"><A HREF="#006">Item&nbsp;8. EXHIBITS</A></TD></TR>
<TR><TD colspan="9"><A HREF="#007">SIGNATURES</A></TD></TR>
<TR><TD colspan="9"><A HREF="v72837orex5-1.htm">EXHIBIT 5.1</A></TD></TR>
<TR><TD colspan="9"><A HREF="v72837orex23-1.htm">EXHIBIT 23.1</A></TD></TR>
<TR><TD colspan="9"><A HREF="v72837orex99-1.htm">EXHIBIT 99.1</A></TD></TR>
<TR><TD colspan="9"><A HREF="v72837orex99-3.htm">EXHIBIT 99.3</A></TD></TR>
</TABLE>
</CENTER>
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<P><HR noshade><P>
<H5 align="left"><A HREF="#toc">Table of Contents</A></H5><P>


<!-- link1 "PART II" -->
<DIV align="left"><A NAME="000"></A></DIV>
<DIV align="left"><A name="000"></A></DIV>
<P align="center"><B>PART II</B>
<P align="center"><B>INFORMATION REQUIRED IN REGISTRATION STATEMENT</B>
  <!-- link2 "Item&nbsp;3. INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE" -->
<DIV align="left"><A NAME="001"></A></DIV>
<DIV align="left"><A name="001"></A></DIV>
<P align="left"><B>Item&nbsp;3. INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE</B>
<P>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The following documents filed with the
  Securities and Exchange Commission (the &#147;Commission&#148;) are hereby incorporated
  by reference in this Registration Statement:
<P>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a)&nbsp;The Registrant&#146;s Annual Report
  on Form&nbsp;10-K for the year ended October 31, 2000, which contains audited
  financial statements for the most recent fiscal year for which such statements
  have been filed;
<P>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b)&nbsp;All other reports filed by the
  Registrant pursuant to Section&nbsp;13(a) or 15(d) of the Securities Exchange
  Act of 1934, as amended (the &#147;Exchange Act&#148;), since the end of the
  fiscal year covered by the Annual Report on Form&nbsp;10-K referred to in (a)&nbsp;above;
  and
<P>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(c)&nbsp;The description of the Registrant&#146;s
  Common Stock contained in the Registrant&#146;s Registration Statement on Form&nbsp;10,
  as amended, under Section&nbsp;12(g) of the Exchange Act.
<P>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;All documents filed by the Registrant pursuant
  to Sections&nbsp;13(a), 13(c), 14 and 15(d) of the Exchange Act after the date
  hereof, and prior to the filing of a post-effective amendment which indicates
  that the securities offered hereby have been sold or which deregister the securities
  covered hereby then remaining unsold, shall also be deemed to be incorporated
  by reference into this Registration Statement and to be a part hereof commencing
  on the respective dates on which such documents are filed.
  <!-- link2 "Item&nbsp;4. DESCRIPTION OF SECURITIES" -->
<DIV align="left"><A NAME="002"></A></DIV>
<DIV align="left"><A name="002"></A></DIV>
<P align="left"><B>Item&nbsp;4. DESCRIPTION OF SECURITIES</B>
<P>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Not applicable.
  <!-- link2 "Item&nbsp;5. INTERESTS OF NAMED EXPERTS AND COUNSEL" -->
<DIV align="left"><A NAME="003"></A></DIV>
<DIV align="left"><A name="003"></A></DIV>
<P align="left"><B>Item&nbsp;5. INTERESTS OF NAMED EXPERTS AND COUNSEL</B>
<P>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;None.
<!-- link2 "Item&nbsp;6. INDEMNIFICATION OF DIRECTORS AND OFFICERS" -->
<DIV align="left"><A NAME="004"></A></DIV>
<DIV align="left"><A name="004"></A></DIV>
<P align="left"><B>Item&nbsp;6. INDEMNIFICATION OF DIRECTORS AND OFFICERS</B>
<P>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Sections&nbsp;23B.08.500 through 23B.08.600
  of the Washington Business Corporation Act authorize a court to award, or a
  corporation&#146;s board of directors to grant, indemnification to directors
  and officers on terms sufficiently broad to permit indemnification under certain
  circumstances for liabilities arising under the Securities Act of 1933, as amended
  (the &#147;Securities Act&#148;). Section&nbsp;10 of the Registrant&#146;s Restated
  Bylaws provides for indemnification of the Registrant&#146;s directors, officers,
  employees and agents to the maximum extent permitted by Washington law.
<P>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Section&nbsp;23B.08.320 of the Washington
  Business Corporation Act authorizes a corporation to limit a director&#146;s
  liability to the corporation or its shareholders for monetary damages for acts
  or omissions as a director, except in certain circumstances involving intentional
  misconduct, self-dealing or illegal corporate loans or distributions, or any
  transactions from which the director personally receives a benefit in money,
  property or services to which the director is not entitled. Article&nbsp;11
  of the Registrant&#146;s Restated Articles of Incorporation contains provisions
  implementing, to the fullest extent permitted by Washington law, such limitations
  on a director&#146;s liability to the Registrant and its shareholders.
<P>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The Registrant also maintains an insurance
  policy insuring its directors and officers against liability for certain acts
  or omissions while acting in their official capacities and has entered into
  indemnification agreements with its officers and directors.
  <!-- link2 "Item&nbsp;7. EXEMPTION FROM REGISTRATION CLAIMED" -->
<DIV align="left"><A NAME="005"></A></DIV>
<DIV align="left"><A name="005"></A></DIV>
<P align="left"><B>Item&nbsp;7. EXEMPTION FROM REGISTRATION CLAIMED</B>
<P>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Not applicable.
<P align="center">II-1
<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left"><A HREF="#toc">Table of Contents</A></H5><P>
  <!-- link2 "Item&nbsp;8. EXHIBITS" -->
<DIV align="left"><A NAME="006"></A></DIV>
<DIV align="left"><A name="006"></A></DIV>
<P align="left"><B>Item&nbsp;8. EXHIBITS</B>
<CENTER>
  <TABLE cellspacing="0" border="0" cellpadding="0" width="100%" align="center">
    <TR valign="bottom">
      <TD width="8%">&nbsp;</TD>
      <TD width="5%">&nbsp;</TD>
      <TD width="87%">&nbsp;</TD>
    </TR>
    <TR valign="bottom">
      <TD nowrap align="center"><FONT size="2"><B>Exhibit</B></FONT></TD>
    </TR>
    <TR valign="bottom">
      <TD nowrap align="center"><FONT size="2"><B>Number</B></FONT></TD>
      <TD></TD>
      <TD nowrap align="center"><FONT size="2"><B>Description</B></FONT></TD>
    </TR>
    <TR valign="bottom">
      <TD nowrap align="center">
        <HR size="1">
      </TD>
      <TD></TD>
      <TD nowrap align="center">
        <HR size="1">
      </TD>
    </TR>
    <TR valign="bottom">
      <TD valign="top"><FONT size="3">5.1</FONT></TD>
      <TD></TD>
      <TD  align="left" valign="top"><FONT size="3"> Opinion of Perkins Coie LLP
        regarding legality of the Common Stock being registered</FONT></TD>
    </TR>
    <TR>
      <TD>
    <TR>
      <TD>
    <TR>
      <TD>
    <TR>
      <TD>
    <TR valign="bottom">
      <TD valign="top"><FONT size="3">23.1</FONT></TD>
      <TD></TD>
      <TD  align="left" valign="top"><FONT size="3"> Consent of PricewaterhouseCoopers
        LLP</FONT></TD>
    </TR>
    <TR>
      <TD>
    <TR>
      <TD>
    <TR>
      <TD>
    <TR>
      <TD>
    <TR valign="bottom">
      <TD valign="top"><FONT size="3">23.2</FONT></TD>
      <TD></TD>
      <TD  align="left" valign="top"><FONT size="3"> Consent of Perkins Coie LLP
        (included in opinion filed as Exhibit&nbsp;5.1)</FONT></TD>
    </TR>
    <TR>
      <TD>
    <TR>
      <TD>
    <TR>
      <TD>
    <TR>
      <TD>
    <TR valign="bottom">
      <TD valign="top"><FONT size="3">24.1</FONT></TD>
      <TD></TD>
      <TD  align="left" valign="top"><FONT size="3"> Power of Attorney (see signature
        page)</FONT></TD>
    </TR>
    <TR>
      <TD>
    <TR>
      <TD>
    <TR>
      <TD>
    <TR>
      <TD>
    <TR valign="bottom">
      <TD valign="top"><FONT size="3">99.1</FONT></TD>
      <TD></TD>
      <TD  align="left" valign="top"><FONT size="3"> Advanced Digital Information
        Corporation Outside Directors August<BR>
        2000 Stock Option Program</FONT></TD>
    </TR>
    <TR>
      <TD>
    <TR>
      <TD>
    <TR>
      <TD>
    <TR>
      <TD>
    <TR valign="bottom">
      <TD valign="top"><FONT size="3">99.2</FONT></TD>
      <TD></TD>
      <TD  align="left" valign="top"><FONT size="3"> Advanced Digital Information
        Corporation Amended and Restated 1999 Stock Incentive Compensation Plan
        (incorporated by reference to Appendix&nbsp;A to ADIC&#146;s Proxy Statement
        on Schedule&nbsp;14A filed on January 17, 2001)</FONT></TD>
    </TR>
    <TR>
      <TD>
    <TR>
      <TD>
    <TR>
      <TD>
    <TR>
      <TD>
    <TR valign="bottom">
      <TD valign="top"><FONT size="3">99.3</FONT></TD>
      <TD></TD>
      <TD  align="left" valign="top"><FONT size="3"> 1997 Stock Option Plan of
        Pathlight Technology, Inc.</FONT></TD>
    </TR>
  </TABLE>
</CENTER>
<P align="left"><B>Item&nbsp;9. UNDERTAKINGS</B>
<P align="left">A. The undersigned Registrant hereby undertakes:
<P>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(1)&nbsp;To file, during any period in
  which offers or sales are being made, a post-effective amendment to this Registration
  Statement:
<P>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(i)&nbsp;To include any prospectus required
  by Section&nbsp;10(a)(3) of the Securities Act;
<P>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(ii)&nbsp;To reflect in the prospectus
  any facts or events arising after the effective date of this 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 this Registration Statement; and
<P>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(iii)&nbsp;To include any material information
  with respect to the plan of distribution not previously disclosed in this Registration
  Statement or any material change to such information in this Registration Statement;
<P>provided, however, that paragraphs (1)(i)
  and (1)(ii) above do not apply if the information required to be included in
  a post-effective amendment by those paragraphs is contained in periodic reports
  filed by the Registrant pursuant to Section&nbsp;13 or Section&nbsp;15(d) of
  the Exchange Act that are incorporated by reference in this Registration Statement.
<P>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(2)&nbsp;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.
<P>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(3)&nbsp;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.
<P>B.&nbsp;The undersigned Registrant hereby
  undertakes that, for purposes of determining any liability under the Securities
  Act, each filing of the Registrant&#146;s annual report pursuant to Section&nbsp;13(a)
  or 15(d) of the Exchange Act (and, where applicable, each filing of an employee
  benefits plan&#146;s annual report pursuant to Section&nbsp;15(d) of the Exchange
  Act) that is incorporated by reference in this 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.
<P align="center">II-2
<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left"><A HREF="#toc">Table of Contents</A></H5><P>
<P>C.&nbsp;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 the successful defense of any action, suit or proceeding)
  is asserted by such director, officer or controlling person in connection with
  the securities being registered, 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 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.
<P align="center">II-3
<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left"><A HREF="#toc">Table of Contents</A></H5><P>
  <!-- link1 "SIGNATURES" -->
<DIV align="left"><A NAME="007"></A></DIV>
<DIV align="left"><A name="007"></A></DIV>
<P align="center"><B>SIGNATURES</B>
<P>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant to the requirements of the Securities
  Act of 1933, the Registrant certifies that it has reasonable grounds to believe
  that it meets all of the requirements for filing on Form&nbsp;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 Redmond, State of Washington, on the
  16th day of May, 2001.
<CENTER>
  <TABLE cellspacing="0" border="0" cellpadding="0" width="100%" align="center">
    <TR valign="bottom">
      <TD width="50%">&nbsp;</TD>
      <TD width="5%">&nbsp;</TD>
      <TD width="50%">&nbsp;</TD>
    </TR>
    <TR valign="bottom">
      <TD valign="top">&nbsp;</TD>
      <TD valign="top" colspan="2"><FONT size="3">ADVANCED DIGITAL INFORMATION
        CORPORATION</FONT></TD>
    </TR>
    <TR>
      <TD>&nbsp;</TD>
      <TD>&nbsp;</TD>
      <TD><FONT size="3">&nbsp;</FONT></TD>
    </TR>
    <TR valign="bottom">
      <TD valign="top">&nbsp;</TD>
      <TD valign="top">&nbsp;</TD>
      <TD valign="top"><FONT size="3">/s/ Peter H. van Oppen</FONT></TD>
    </TR>
    <TR>
      <TD>&nbsp;</TD>
      <TD colspan="2">
        <hr size="1">
      </TD>
    </TR>
    <TR valign="bottom">
      <TD valign="top">&nbsp;</TD>
      <TD valign="top"><font size="3">By:</font></TD>
      <TD valign="top"><FONT size="3"> Peter H. van Oppen<BR>
        Chairman of the Board and Chief Executive<BR>
        Officer</FONT></TD>
    </TR>
  </TABLE>
</CENTER>
<P align="center"><B>POWER OF ATTORNEY</B>
<P>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Each person whose individual signature
  appears below hereby authorizes Peter H. van Oppen and Leslie S. Rock, or either
  of them, as attorneys-in-fact with full power of substitution, to execute in
  the name and on the behalf of each person, individually and in each capacity
  stated below, and to file, any and all post-effective amendments to this Registration
  Statement.
<P>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant to the requirements of the Securities
  Act of 1933, this Registration Statement has been signed by the following persons
  in the capacities indicated below on the 16th day of May, 2001.
<CENTER>
  <TABLE cellspacing="0" border="0" cellpadding="0" width="95%" align="center">
    <TR valign="bottom">
      <TD width="45%">&nbsp;</TD>
      <TD width="5%">&nbsp;</TD>
      <TD width="59%">&nbsp;</TD>
    </TR>
    <TR valign="bottom">
      <TD nowrap align="center"><FONT size="2"><B>Signature</B></FONT></TD>
      <TD></TD>
      <TD nowrap align="center"><FONT size="2"><B>Title</B></FONT></TD>
    </TR>
    <TR valign="bottom">
      <TD nowrap align="center">
        <HR size="1">
      </TD>
      <TD></TD>
      <TD nowrap align="center">
        <HR size="1">
      </TD>
    </TR>
    <TR valign="bottom">
      <TD valign="top">
        <div align="center"><FONT size="3">/s/ Peter H. van Oppen <br>
          </FONT>
          <hr size="1">
          <font size="3">Peter H. van Oppen</font> </div>
      </TD>
      <TD></TD>
      <TD  align="left" valign="top"><FONT size="3"> Chief Executive Officer and
        Chairman of the Board <br>
        (Principal Executive Officer) </FONT></TD>
    </TR>
    <TR valign="bottom">
      <TD valign="top" height="23">&nbsp;</TD>
      <TD height="23"></TD>
      <TD  align="left" valign="top" height="23">&nbsp;</TD>
    </TR>
    <TR>
      <TD>
    <TR>
      <TD>
    <TR>
      <TD>
    <TR>
      <TD>
    <TR valign="bottom">
      <TD valign="top">
        <div align="center"><font size="3">/s/ Jon Gacek<br>
          </font>
          <hr size="1">
          <font size="3">Jon Gacek</font></div>
      </TD>
      <TD></TD>
      <TD  align="left" valign="top"><font size="3">Senior Vice President and
        Chief Financial Officer (Principal Financial and Accounting Officer)</font></TD>
    </TR>
    <TR valign="bottom">
      <TD valign="top">&nbsp;</TD>
      <TD></TD>
      <TD  align="left" valign="top">&nbsp;</TD>
    </TR>
    <TR valign="bottom">
      <TD valign="top">
        <div align="center"><FONT size="3">/s/ Tom A. Alberg <br>
          </FONT>
          <hr size="1">
          <FONT size="3">Tom A. Alberg </FONT></div>
      </TD>
      <TD></TD>
      <TD  align="left" valign="top"><FONT size="3"> Director</FONT></TD>
    </TR>
    <TR>
      <TD>
    <TR>
      <TD>
    <TR>
      <TD>
    <TR>
      <TD>
    <TR valign="bottom">
      <TD valign="top">&nbsp;</TD>
      <TD></TD>
      <TD  align="left" valign="top">&nbsp;</TD>
    </TR>
    <TR valign="bottom">
      <TD valign="top">
        <div align="center"><FONT size="3">/s/ Christopher T. Bayley<br>
          </FONT>
          <hr size="1">
          <FONT size="3">Christopher T. Bayley </FONT></div>
      </TD>
      <TD></TD>
      <TD  align="left" valign="top"><FONT size="3"> Director</FONT></TD>
    </TR>
    <TR>
      <TD>
    <TR>
      <TD>
    <TR>
      <TD>
    <TR>
      <TD>
    <TR valign="bottom">
      <TD valign="top">&nbsp;</TD>
      <TD></TD>
      <TD  align="left" valign="top">&nbsp;</TD>
    </TR>
    <TR valign="bottom">
      <TD valign="top">
        <div align="center"><FONT size="3">/s/ Richard L. McCormick <br>
          </FONT>
          <hr size="1">
          <FONT size="3">Richard L. McCormick </FONT></div>
      </TD>
      <TD></TD>
      <TD  align="left" valign="top"><FONT size="3"> Director</FONT></TD>
    </TR>
    <TR>
      <TD>
    <TR>
      <TD>
    <TR>
      <TD>
    <TR>
      <TD>
    <TR valign="bottom">
      <TD valign="top">&nbsp;</TD>
      <TD></TD>
      <TD  align="left" valign="top">&nbsp;</TD>
    </TR>
    <TR valign="bottom">
      <TD valign="top">&nbsp;</TD>
      <TD></TD>
      <TD  align="left" valign="top"><font size="3">Director</font></TD>
    </TR>
    <TR valign="bottom">
      <TD valign="bottom">
        <hr size="1">
      </TD>
      <TD></TD>
      <TD  align="left" valign="top">&nbsp;</TD>
    </TR>
    <TR valign="bottom">
      <TD valign="top">
        <div align="center"><FONT size="3">John W. Stanton</FONT></div>
      </TD>
      <TD></TD>
      <TD  align="left" valign="top"><FONT size="3"> </FONT></TD>
    </TR>
    <TR>
      <TD>
    <TR>
      <TD>
    <TR>
      <TD>
    <TR>
      <TD>
    <TR valign="bottom">
      <TD valign="top">&nbsp;</TD>
      <TD></TD>
      <TD  align="left" valign="top">&nbsp;</TD>
    </TR>
    <TR valign="bottom">
      <TD valign="top">&nbsp;</TD>
      <TD></TD>
      <TD  align="left" valign="top">&nbsp;</TD>
    </TR>
    <TR valign="bottom">
      <TD valign="top">
        <div align="center"><FONT size="3">/s/ Walter F. Walker<br>
          </FONT>
          <hr size="1">
          <FONT size="3">Walter F. Walker</FONT></div>
      </TD>
      <TD></TD>
      <TD  align="left" valign="top"><FONT size="3"> Director</FONT></TD>
    </TR>

    <TR>
      <TD>
    <TR>
      <TD>
    <TR>
      <TD>
    <TR>
      <TD>
  </TABLE>
</CENTER>
<P align="center">II-4
<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left"><A HREF="#toc">Table of Contents</A></H5><P>
<P align="center"><B>INDEX TO EXHIBITS</B>
<CENTER>
  <TABLE cellspacing="0" border="0" cellpadding="0" width="100%" align="center">
    <TR valign="bottom">
      <TD width="8%">&nbsp;</TD>
      <TD width="5%">&nbsp;</TD>
      <TD width="87%">&nbsp;</TD>
    </TR>
    <TR valign="bottom">
      <TD nowrap align="center"><FONT size="2"><B>Exhibit</B></FONT></TD>
    </TR>
    <TR valign="bottom">
      <TD nowrap align="center"><FONT size="2"><B>Number</B></FONT></TD>
      <TD></TD>
      <TD nowrap align="center"><FONT size="2"><B>Description</B></FONT></TD>
    </TR>
    <TR valign="bottom">
      <TD nowrap align="center">
        <HR size="1">
      </TD>
      <TD></TD>
      <TD nowrap align="center">
        <HR size="1">
      </TD>
    </TR>
    <TR valign="bottom">
      <TD valign="top"><FONT size="3">5.1</FONT></TD>
      <TD></TD>
      <TD  align="left" valign="top"><FONT size="3"> Opinion of Perkins Coie LLP
        regarding legality of the Common Stock being registered</FONT></TD>
    </TR>
    <TR>
      <TD>
    <TR>
      <TD>
    <TR>
      <TD>
    <TR>
      <TD>
    <TR valign="bottom">
      <TD valign="top"><FONT size="3">23.1</FONT></TD>
      <TD></TD>
      <TD  align="left" valign="top"><FONT size="3"> Consent of PricewaterhouseCoopers
        LLP</FONT></TD>
    </TR>
    <TR>
      <TD>
    <TR>
      <TD>
    <TR>
      <TD>
    <TR>
      <TD>
    <TR valign="bottom">
      <TD valign="top"><FONT size="3">23.2</FONT></TD>
      <TD></TD>
      <TD  align="left" valign="top"><FONT size="3"> Consent of Perkins Coie LLP
        (included in opinion filed as Exhibit&nbsp;5.1)</FONT></TD>
    </TR>
    <TR>
      <TD>
    <TR>
      <TD>
    <TR>
      <TD>
    <TR>
      <TD>
    <TR valign="bottom">
      <TD valign="top"><FONT size="3">24.1</FONT></TD>
      <TD></TD>
      <TD  align="left" valign="top"><FONT size="3"> Power of Attorney (see signature
        page)</FONT></TD>
    </TR>
    <TR>
      <TD>
    <TR>
      <TD>
    <TR>
      <TD>
    <TR>
      <TD>
    <TR valign="bottom">
      <TD valign="top"><FONT size="3">99.1</FONT></TD>
      <TD></TD>
      <TD  align="left" valign="top"><FONT size="3"> Advanced Digital Information
        Corporation Outside Directors August<BR>
        2000 Stock Option Program</FONT></TD>
    </TR>
    <TR>
      <TD>
    <TR>
      <TD>
    <TR>
      <TD>
    <TR>
      <TD>
    <TR valign="bottom">
      <TD valign="top"><FONT size="3">99.2</FONT></TD>
      <TD></TD>
      <TD  align="left" valign="top"><FONT size="3"> Advanced Digital Information
        Corporation Amended and Restated 1999 Stock Incentive Compensation Plan
        (incorporated by reference to Appendix&nbsp;A to ADIC&#146;s Proxy Statement
        on Schedule&nbsp;14A filed on January 17, 2001)</FONT></TD>
    </TR>
    <TR>
      <TD>
    <TR>
      <TD>
    <TR>
      <TD>
    <TR>
      <TD>
    <TR valign="bottom">
      <TD valign="top"><FONT size="3">99.3</FONT></TD>
      <TD></TD>
      <TD  align="left" valign="top"><FONT size="3"> 1997 Stock Option Plan of
        Pathlight Technology, Inc.</FONT></TD>
    </TR>
  </TABLE>
</CENTER>
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s-8
Table of Contents
As filed with the Securities and Exchange Commission on May 17,
  2001
Registration No. 333-
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
______________________
FORM S-8
REGISTRATION STATEMENT
UNDER
THE SECURITIES ACT OF 1933
______________________
ADVANCED DIGITAL INFORMATION CORPORATION
(Exact name of Registrant as specified in its charter)
Washington
91-1618616
(State or other jurisdiction of incorporation
            or organization)
(I.R.S. Employer Identification
            No.)
P.O. Box 97057
11431 Willows Road N.E.
Redmond, Washington 98073-9757
(Address of principal executive offices, including zip code)
Advanced Digital Information Corporation Outside Directors
  August 2000 Stock Option Program
Advanced Digital Information Corporation Amended and Restated
  1999 Stock Incentive Compensation Plan
1997 Stock Option Plan of Pathlight Technology,
Inc.
(Full title of the plans)
PETER H. VAN OPPEN
Chief Executive Officer
Advanced Digital Information Corporation
P.O. Box 97057
11431 Willows Road N.E.
Redmond, Washington 98073-9757
(425) 881-8004
(Name, address and telephone number, including area code, of
  agent for service)
______________________
Copy to:
SCOTT L. GELBAND
Perkins Coie LLP
505 Fifth Avenue South, Suite 620
Seattle, Washington 98104-3846
(206) 287-3505
CALCULATION OF REGISTRATION FEE
Title of Securities
Amount to Be
Proposed Maximum
Proposed Maximum
Amount of
to Be Registered
Registered(1)
Offering Price Per
      Share
Aggregate Offering
      Price
Registration Fee
Common
        Stock, no par value, subject to outstanding options under the:
Outside
        Directors August 2000 Stock Option Program
21,600
$
12.7815
(2)
$
276,080.40
$
69.02
1997
        Stock Option Plan of Pathlight Technology, Inc.
520,502
(3)
$
1.399
(4)
$
728,182.30
$
182.05
Common
        Stock, no par value, authorized but not subject to outstanding options
        or subject to prior registration under the:
Amended
        and Restated 1999 Stock Incentive Compensation Plan
2,000,000
$
22.015
(5)
$
44,030,000.00
$
11,007.50
TOTAL:
2,542,102
$
45,034,262.70
$
11,258.57
Table of Contents
(1)
Together with an indeterminate number of additional shares
      which may be necessary to adjust the number of shares reserved for issuance
      pursuant to the plans as the result of any future stock split, stock dividend
      or similar adjustment of the Registrant's outstanding Common Stock.
(2)
Computed pursuant to Rule 457(h) under the Securities
      Act of 1933, as amended. The proposed maximum offering price of $12.7815
      represents the exercise price for each currently outstanding option grant.
(3)
Pursuant to an Agreement and Plan of Merger among the Registrant,
      PTech Acquisition, Inc. and Pathlight Technology, Inc. ("Pathlight")
      dated as of January 30, 2001 (the "Merger Agreement"), the
      Registrant assumed the outstanding options to purchase common stock of Pathlight,
      under its 1997 Stock Option Plan (the "Pathlight Assumed Options"),
      with appropriate adjustments to the number of shares and the exercise price
      of each Pathlight Assumed Option to reflect the ratio at which Pathlight
      common stock was converted into common stock of the Registrant under the
      Merger Agreement.
(4)
Shares are issuable upon exercise of outstanding options with
      fixed exercise prices. Pursuant to Rule 457(h) under the Securities
      Act of 1933, as amended, the proposed maximum aggregate offering price and
      the registration fee have been computed based on the weighted average exercise
      price for shares subject to outstanding options, which exercise prices range
      from $3.454 per share to $0.123 per share.
(5)
Estimated pursuant to Rule 457(c) under the Securities
      Act of 1933, as amended, solely for the purpose of calculating the registration
      fee. The price per share under the plans is estimated to be $22.015 based
      on the average of the high ($23.25) and low ($20.78) sales prices for the
      Common Stock on May 14, 2001 as reported by the Nasdaq National Market.
TABLE OF CONTENTS
PART II
Item 3. INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE
Item 4. DESCRIPTION OF SECURITIES
Item 5. INTERESTS OF NAMED EXPERTS AND COUNSEL
Item 6. INDEMNIFICATION OF DIRECTORS AND OFFICERS
Item 7. EXEMPTION FROM REGISTRATION CLAIMED
Item 8. EXHIBITS
SIGNATURES
EXHIBIT 5.1
EXHIBIT 23.1
EXHIBIT 99.1
EXHIBIT 99.3
Table of Contents
PART II
INFORMATION REQUIRED IN REGISTRATION STATEMENT
Item 3. INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE
The following documents filed with the
  Securities and Exchange Commission (the "Commission") are hereby incorporated
  by reference in this Registration Statement:
(a) The Registrant's Annual Report
  on Form 10-K for the year ended October 31, 2000, which contains audited
  financial statements for the most recent fiscal year for which such statements
  have been filed;
(b) All other reports filed by the
  Registrant pursuant to Section 13(a) or 15(d) of the Securities Exchange
  Act of 1934, as amended (the "Exchange Act"), since the end of the
  fiscal year covered by the Annual Report on Form 10-K referred to in (a) above;
  and
(c) The description of the Registrant's
  Common Stock contained in the Registrant's Registration Statement on Form 10,
  as amended, under Section 12(g) of the Exchange Act.
All documents filed by the Registrant pursuant
  to Sections 13(a), 13(c), 14 and 15(d) of the Exchange Act after the date
  hereof, and prior to the filing of a post-effective amendment which indicates
  that the securities offered hereby have been sold or which deregister the securities
  covered hereby then remaining unsold, shall also be deemed to be incorporated
  by reference into this Registration Statement and to be a part hereof commencing
  on the respective dates on which such documents are filed.
Item 4. DESCRIPTION OF SECURITIES
Not applicable.
Item 5. INTERESTS OF NAMED EXPERTS AND COUNSEL
None.
Item 6. INDEMNIFICATION OF DIRECTORS AND OFFICERS
Sections 23B.08.500 through 23B.08.600
  of the Washington Business Corporation Act authorize a court to award, or a
  corporation's board of directors to grant, indemnification to directors
  and officers on terms sufficiently broad to permit indemnification under certain
  circumstances for liabilities arising under the Securities Act of 1933, as amended
  (the "Securities Act"). Section 10 of the Registrant's Restated
  Bylaws provides for indemnification of the Registrant's directors, officers,
  employees and agents to the maximum extent permitted by Washington law.
Section 23B.08.320 of the Washington
  Business Corporation Act authorizes a corporation to limit a director's
  liability to the corporation or its shareholders for monetary damages for acts
  or omissions as a director, except in certain circumstances involving intentional
  misconduct, self-dealing or illegal corporate loans or distributions, or any
  transactions from which the director personally receives a benefit in money,
  property or services to which the director is not entitled. Article 11
  of the Registrant's Restated Articles of Incorporation contains provisions
  implementing, to the fullest extent permitted by Washington law, such limitations
  on a director's liability to the Registrant and its shareholders.
The Registrant also maintains an insurance
  policy insuring its directors and officers against liability for certain acts
  or omissions while acting in their official capacities and has entered into
  indemnification agreements with its officers and directors.
Item 7. EXEMPTION FROM REGISTRATION CLAIMED
Not applicable.
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Table of Contents
Item 8. EXHIBITS
Exhibit
Number
Description
5.1
Opinion of Perkins Coie LLP
        regarding legality of the Common Stock being registered
23.1
Consent of PricewaterhouseCoopers
        LLP
23.2
Consent of Perkins Coie LLP
        (included in opinion filed as Exhibit 5.1)
24.1
Power of Attorney (see signature
        page)
99.1
Advanced Digital Information
        Corporation Outside Directors August
2000 Stock Option Program
99.2
Advanced Digital Information
        Corporation Amended and Restated 1999 Stock Incentive Compensation Plan
        (incorporated by reference to Appendix A to ADIC's Proxy Statement
        on Schedule 14A filed on January 17, 2001)
99.3
1997 Stock Option Plan of
        Pathlight Technology, Inc.
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 this 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 this Registration Statement; and
(iii) To include any material information
  with respect to the plan of distribution not previously disclosed in this Registration
  Statement or any material change to such information in this Registration Statement;
provided, however, that paragraphs (1)(i)
  and (1)(ii) above do not apply if the information required to be included in
  a post-effective amendment by those paragraphs is contained in periodic reports
  filed by the Registrant pursuant to Section 13 or Section 15(d) of
  the Exchange Act that are incorporated by reference in this 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.
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 15(d) of the Exchange Act (and, where applicable, each filing of an employee
  benefits plan's annual report pursuant to Section 15(d) of the Exchange
  Act) that is incorporated by reference in this 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-2
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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 the successful defense of any action, suit or proceeding)
  is asserted by such director, officer or controlling person in connection with
  the securities being registered, 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 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-3
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SIGNATURES
Pursuant to the requirements of the Securities
  Act of 1933, the Registrant 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 Redmond, State of Washington, on the
  16th day of May, 2001.
ADVANCED DIGITAL INFORMATION
        CORPORATION
/s/ Peter H. van Oppen
By:
Peter H. van Oppen
Chairman of the Board and Chief Executive
Officer
POWER OF ATTORNEY
Each person whose individual signature
  appears below hereby authorizes Peter H. van Oppen and Leslie S. Rock, or either
  of them, as attorneys-in-fact with full power of substitution, to execute in
  the name and on the behalf of each person, individually and in each capacity
  stated below, and to file, any and all post-effective amendments to this Registration
  Statement.
Pursuant to the requirements of the Securities
  Act of 1933, this Registration Statement has been signed by the following persons
  in the capacities indicated below on the 16th day of May, 2001.
Signature
Title
/s/ Peter H. van Oppen
Peter H. van Oppen
Chief Executive Officer and
        Chairman of the Board
(Principal Executive Officer)
/s/ Jon Gacek
Jon Gacek
Senior Vice President and
        Chief Financial Officer (Principal Financial and Accounting Officer)
/s/ Tom A. Alberg
Tom A. Alberg
Director
/s/ Christopher T. Bayley
Christopher T. Bayley
Director
/s/ Richard L. McCormick
Richard L. McCormick
Director
Director
John W. Stanton
/s/ Walter F. Walker
Walter F. Walker
Director
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INDEX TO EXHIBITS
Exhibit
Number
Description
5.1
Opinion of Perkins Coie LLP
        regarding legality of the Common Stock being registered
23.1
Consent of PricewaterhouseCoopers
        LLP
23.2
Consent of Perkins Coie LLP
        (included in opinion filed as Exhibit 5.1)
24.1
Power of Attorney (see signature
        page)
99.1
Advanced Digital Information
        Corporation Outside Directors August
2000 Stock Option Program
99.2
Advanced Digital Information
        Corporation Amended and Restated 1999 Stock Incentive Compensation Plan
        (incorporated by reference to Appendix A to ADIC's Proxy Statement
        on Schedule 14A filed on January 17, 2001)
99.3
1997 Stock Option Plan of
        Pathlight Technology, Inc.