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Added information about HD-Copy format
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<!-- firstHeading -->
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<h1 id="firstHeading" class="firstHeading">
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<span dir="auto">IMG</span>
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</h1>
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<div id="siteSub">From Just Solve the File Format Problem</div>
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<tr>
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<th colspan="2"><a href="/wiki/File_Formats" title="File Formats">File Format</a></th>
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</tr>
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<tr>
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<th>Name</th>
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<td>IMG</td>
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</tr>
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<tr>
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<th> Ontology
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</th>
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<td>
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<ul><li>
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<a href="/wiki/Electronic_File_Formats" title="Electronic File Formats">Electronic File Formats</a>
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<ul><li>
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<a href="/wiki/Disk_Image_Formats" title="Disk Image Formats">Disk Image Formats</a>
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<ul><li>
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<strong class="selflink">IMG</strong>
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</li></ul>
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</li></ul>
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</li></ul>
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</td>
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</tr>
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<tr>
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<th>Extension(s)</th>
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<td><code>.img</code></td>
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</tr>
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</table>
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<h2> <span class="mw-headline" id="Overview">Overview</span></h2>
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<p><b>IMG</b> is an RLE-compressed sector-based disk image format probably used by the DOS program HD-Copy and/or others. It should not be confused with raw image files (sector dumps).
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</p><p>There is a Pascal program floating around the internet which includes source code and can convert these IMG files to raw sector dumps. It is called <b>DOSIMG</b> and can be found mainly on various Chinese websites<sup id="cite_ref-0" class="reference"><a href="#cite_note-0">[1]</a></sup><sup id="cite_ref-1" class="reference"><a href="#cite_note-1">[2]</a></sup>
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</p>
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<h2> <span class="mw-headline" id="Format_description">Format description</span></h2>
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<table>
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<tr>
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<th style="text-align: left;">byte
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</th>
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<th style="text-align: left;">description
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</th></tr>
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<tr>
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<td>0
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</td>
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<td>last track on the original disk (either 39 or 79)
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</td></tr>
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<tr>
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<td>1
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</td>
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<td>number of sectors per track
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</td></tr>
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<tr>
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<td>2-166
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</td>
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<td>one byte for each track, 0x01 if the track is included in the file, 0x00 otherwise (empty/unformatted)
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</td></tr>
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<tr>
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<td colspan="2">For each track:
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</td></tr>
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<tr>
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<td>2 bytes
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</td>
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<td>compressed size of this track, <a href="/wiki/Endianness" title="Endianness">little-endian</a>, not including this size field but including the next byte
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</td></tr>
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<tr>
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<td>1 byte
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</td>
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<td>the escape-byte for the RLE coding
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</td></tr>
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<tr>
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<td>n-1 bytes
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</td>
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<td>The actual sector data, RLE compressed. Should uncompress to at most num_sectors * 512 bytes, rest is filled with zero.
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<p>Each byte is copied 1:1 to the output buffer, except when the escape-byte is encountered. Then, the next 2 bytes specify a byte-value and a count-value. To uncompress, copy the first byte after the escape-byte as many times as the second byte implies to the output buffer.
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</p>
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</td></tr></table>
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<h2> <span class="mw-headline" id="References">References</span></h2>
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<ol class="references"><li id="cite_note-0"><a href="#cite_ref-0">↑</a> <span class="reference-text"><a rel="nofollow" class="external free" href="http://download.pchome.net/system/disk/down-13054-1.html">http://download.pchome.net/system/disk/down-13054-1.html</a></span>
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</li>
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<li id="cite_note-1"><a href="#cite_ref-1">↑</a> <span class="reference-text"><a rel="nofollow" class="external free" href="http://roy.orz.hm/soft/DOSIMG.zip">http://roy.orz.hm/soft/DOSIMG.zip</a></span>
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Retrieved from "<a href="http://fileformats.archiveteam.org/index.php?title=IMG&oldid=16715">http://fileformats.archiveteam.org/index.php?title=IMG&oldid=16715</a>" </div>
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<li id="footer-info-lastmod"> This page was last modified on 24 March 2014, at 00:48.</li>
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</div>
|
||||
<!-- /footer -->
|
||||
<script src="http://fileformats.archiveteam.org/load.php?debug=false&lang=en&modules=skins.vector&only=scripts&skin=vector&*"></script>
|
||||
<script>if(window.mw){
|
||||
mw.loader.load(["mediawiki.user","mediawiki.page.ready"], null, true);
|
||||
}</script>
|
||||
<!-- Served in 0.066 secs. -->
|
||||
</body>
|
||||
</html>
|
||||
Reference in New Issue
Block a user