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Microsoft KB Archive/101061 - Revision history
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<p>Text replacement - """ to """</p>
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 08:17, 20 July 2020</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>= <span id="KB101061"></span>CHKDSK Reports <del style="font-weight: bold; text-decoration: none;">&quot;</del>Probable Non-DOS Disk<del style="font-weight: bold; text-decoration: none;">&quot; </del>=</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>= <span id="KB101061"></span>CHKDSK Reports <ins style="font-weight: bold; text-decoration: none;">"</ins>Probable Non-DOS Disk<ins style="font-weight: bold; text-decoration: none;">" </ins>=</div></td></tr>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l66">Line 66:</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><li><p>The media descriptor byte in one or both of the file allocation tables (FATs) for the drive producing the error message is incorrect or corrupted.<br /></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><li><p>The media descriptor byte in one or both of the file allocation tables (FATs) for the drive producing the error message is incorrect or corrupted.<br /></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><br /></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><br /></div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>If the drive has been partitioned and formatted with MS-DOS, you can use a disk editor (such a Norton DiskEdit) to edit the FAT. The FAT should be viewed as hexidecimal. The first byte in the FAT for a hard (fixed) disk should be <del style="font-weight: bold; text-decoration: none;">&quot;</del>F8<del style="font-weight: bold; text-decoration: none;">&quot; </del>(without the quotation marks). The following is an example of the first three lines of the FAT and the location of the media descriptor byte:</p></div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>If the drive has been partitioned and formatted with MS-DOS, you can use a disk editor (such a Norton DiskEdit) to edit the FAT. The FAT should be viewed as hexidecimal. The first byte in the FAT for a hard (fixed) disk should be <ins style="font-weight: bold; text-decoration: none;">"</ins>F8<ins style="font-weight: bold; text-decoration: none;">" </ins>(without the quotation marks). The following is an example of the first three lines of the FAT and the location of the media descriptor byte:</p></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><pre class="fixed_text"> 00000000: F8 FF FF FF 03 00 04 00 - 05 00 06 00 07 00 08 00</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><pre class="fixed_text"> 00000000: F8 FF FF FF 03 00 04 00 - 05 00 06 00 07 00 08 00</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div> 00000010: 09 00 0A 00 0B 00 0C 00 - 0D 00 0E 00 0F 00 10 00</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div> 00000010: 09 00 0A 00 0B 00 0C 00 - 0D 00 0E 00 0F 00 10 00</div></td></tr>
<tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l73">Line 73:</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><p>WARNING: The above text is an example. You should NOT use a disk editor to change your FAT to match the above text.<br /></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><p>WARNING: The above text is an example. You should NOT use a disk editor to change your FAT to match the above text.<br /></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><br /></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><br /></div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>The media descriptor byte is the first two digits after the colon (:) in the first line, in this example. <del style="font-weight: bold; text-decoration: none;">&quot;</del>F8.<del style="font-weight: bold; text-decoration: none;">&quot; </del>This is the correct setting for all MS-DOS formatted fixed disks (hard disk drives). Below is an abridged list of valid entries for the media descriptor byte and the media type the descriptor denotes:</p></div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>The media descriptor byte is the first two digits after the colon (:) in the first line, in this example. <ins style="font-weight: bold; text-decoration: none;">"</ins>F8.<ins style="font-weight: bold; text-decoration: none;">" </ins>This is the correct setting for all MS-DOS formatted fixed disks (hard disk drives). Below is an abridged list of valid entries for the media descriptor byte and the media type the descriptor denotes:</p></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><pre class="fixed_text"> F8 Fixed disk</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><pre class="fixed_text"> F8 Fixed disk</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div> F0 3.5-inch, 2-sided, 18-sector</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div> F0 3.5-inch, 2-sided, 18-sector</div></td></tr>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== REFERENCES ==</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== REFERENCES ==</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">&quot;</del>The MS-DOS Encyclopedia,<del style="font-weight: bold; text-decoration: none;">&quot; </del>Microsoft Press, 1988</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">"</ins>The MS-DOS Encyclopedia,<ins style="font-weight: bold; text-decoration: none;">" </ins>Microsoft Press, 1988</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div></div></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div></div></div></td></tr>
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3155ffGd: importing KB archive
2020-07-18T15:02:07Z
<p>importing KB archive</p>
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= <span id="KB101061"></span>CHKDSK Reports &quot;Probable Non-DOS Disk&quot; =<br />
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Article ID: 101061<br />
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Article Last Modified on 11/19/1999<br />
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APPLIES TO<br /><br />
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* Microsoft MS-DOS 6.0 Standard Edition<br />
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This article was previously published under Q101061<br />
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== SUMMARY ==<br />
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When you run CHKDSK on a logical MS-DOS or DoubleSpace-compressed drive, you may receive the following error message if the drive was not partitioned or formatted with MS-DOS utilities, or if the media descriptor byte in the file allocation table (FAT) for the drive is incorrect or corrupted:<br />
<div class="errormessage"><br />
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Probable non-DOS disk<br /><br />
Continue (Y/N)?<br />
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== MORE INFORMATION ==<br />
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This error message may occur for one of the following reasons:<br /><br />
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<li>The disk was not formatted with the MS-DOS FORMAT command or was partitioned using a nonstandard partitioning scheme. The CHKDSK command should be used only on MS-DOS disks. Confirm that the disk or drive is an MS-DOS disk and that it is formatted.<br /><br />
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Some disks not formatted with the MS-DOS FORMAT command may cause the CHKDSK command to display this message; however, the CHKDSK process may still function properly. If you have a nonstandard partitioning scheme, make sure the correct device drivers are loaded.</li><br />
<li><p>The media descriptor byte in one or both of the file allocation tables (FATs) for the drive producing the error message is incorrect or corrupted.<br /><br />
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If the drive has been partitioned and formatted with MS-DOS, you can use a disk editor (such a Norton DiskEdit) to edit the FAT. The FAT should be viewed as hexidecimal. The first byte in the FAT for a hard (fixed) disk should be &quot;F8&quot; (without the quotation marks). The following is an example of the first three lines of the FAT and the location of the media descriptor byte:</p><br />
<pre class="fixed_text"> 00000000: F8 FF FF FF 03 00 04 00 - 05 00 06 00 07 00 08 00<br />
00000010: 09 00 0A 00 0B 00 0C 00 - 0D 00 0E 00 0F 00 10 00<br />
00000020: 11 00 12 00 13 00 14 00 - 15 00 FF FF 17 00 18 00<br />
</pre><br />
<p>WARNING: The above text is an example. You should NOT use a disk editor to change your FAT to match the above text.<br /><br />
<br /><br />
The media descriptor byte is the first two digits after the colon (:) in the first line, in this example. &quot;F8.&quot; This is the correct setting for all MS-DOS formatted fixed disks (hard disk drives). Below is an abridged list of valid entries for the media descriptor byte and the media type the descriptor denotes:</p><br />
<pre class="fixed_text"> F8 Fixed disk<br />
F0 3.5-inch, 2-sided, 18-sector<br />
F9 3.5-inch, 2-sided, 9-sector<br />
F9 5.25-inch, 2-sided, 15-sector<br />
FC 5.25-inch, 1-sided, 9-sector<br />
FD 5.25-inch, 2-sided, 9-sector<br />
FE 5.25-inch, 1-sided, 8-sector<br />
FF 5.25-inch, 2-sided, 8-sector<br />
FE 8-inch, 1-sided, single-density<br />
FD 8-inch, 2-sided, single-density<br />
FE 8-inch, 2-sided, double-density<br />
FD 8-inch, 2-sided, double-density<br />
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== REFERENCES ==<br />
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&quot;The MS-DOS Encyclopedia,&quot; Microsoft Press, 1988<br />
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Additional query words: dblspace 6.00 nondos<br />
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Keywords: KB101061<br />
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