173 lines
6.1 KiB
HTML
173 lines
6.1 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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<title>Examples of the error correction</title>
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<link rel="stylesheet" type="text/css" href="../include/dvdisaster.css">
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</head>
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<body>
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<!-- Title header -->
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<table width="100%" cellpadding="0" border="0">
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<tr>
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<td align="left">
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<span class="fxxl"><b>dvdisaster</b></span>
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<i>Version 0.72.4 / 0.72 (pl4)</i>
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</td>
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<td align="right">
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<span class="fxxl"> </span><a href="http://dvdisaster.net/en/">To the Internet version</a>
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<a href="../cs/index10.html"></a>
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<a href="../de/index10.html"></a>
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<a href="../ru/index10.html"></a>
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</td>
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</tr>
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</table>
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<!-- Language chooser or separator -->
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<table width="100%" cellpadding="0" border="0">
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<tr>
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<td colspan="2" class="hsep"></td>
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</tr>
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<tr><td colspan="2" style="height: 10px">
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</td></tr>
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</table>
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<!-- Main body (Navigation, actual page content, optional news column) -->
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<table width="100%" cellspacing=0>
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<tr>
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<!-- Navigation -->
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<td style="background-color:#f0f0f0; vertical-align:top; width:20%;">
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<table width="100%" cellpadding="10">
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<tr>
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<td>
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<span class="fs"><b>Contents</b></span>
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<table width="100%" cellpadding="0" cellspacing="0">
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<tr>
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<td class="hsep"></td>
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</tr>
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</table><p>
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<table width="100%">
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<tr><td colspan=3><span class="fs"><a href="news.html">News</a></span></td></tr>
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<tr><td></td><td></td><td style="height:10px;"></td></tr>
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<tr><td colspan=3><span class="fs"><a href="index.html">Overview</a></span></td></tr>
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<tr><td style="width:1%; vertical-align:top;">·</td><td colspan=2><span class="fs">Examples of the error correction</span></td></tr>
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<tr><td style="width:1%; vertical-align:top;">·</td><td colspan=2><span class="fs"><a href="index20.html">dvdisaster complements quality scans</a></span></td></tr>
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<tr><td style="width:1%; vertical-align:top;">·</td><td colspan=2><span class="fs"><a href="index30.html">Pro and con of dvdisaster</a></span></td></tr>
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<tr><td></td><td></td><td style="height:10px;"></td></tr>
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<tr><td colspan=3><span class="fs"><a href="howtos.html">Howtos</a></span></td></tr>
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<tr><td></td><td></td><td style="height:10px;"></td></tr>
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<tr><td colspan=3><span class="fs"><a href="download.html">Download</a></span></td></tr>
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<tr><td></td><td></td><td style="height:10px;"></td></tr>
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<tr><td colspan=3><span class="fs"><a href="qa.html">Questions and Answers</a></span></td></tr>
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<tr><td></td><td></td><td style="height:10px;"></td></tr>
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<tr><td colspan=3><span class="fs"><a href="feedback.html">Bug reporting</a></span></td></tr>
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</table>
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</td>
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</tr>
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</table>
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</td>
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<td></td>
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<!-- Actual page contents -->
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<td style="vertical-align:top; width:77%;" rowspan="2">
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<!-- Insert actual page content below -->
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<h3 class="top">Examples of the error correction</h3>
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<!-- begin of screen shot -->
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<table>
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<tr>
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<td class="valignt">
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<b>Recovery of aged media.</b> The medium processed here has become
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discolored and partly unreadable in its outer region. A surface scan
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yields about 23.000 unreadable sectors of 342.000 sectors total; resulting
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in about 7,2% defective sectors.
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</td>
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<td>
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<a name="snap1"></a>
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<table class="thumbnail" width="160">
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<tr><td><span class="fs">Reading the defective medium.</span></td></tr>
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<tr><td><a href="index10_expand=1.html#snap1"><img src="thumbnails/recover-linear.png" alt="" class="noborder"></a></td></tr>
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</table>
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</td>
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</tr>
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</table><p>
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<!-- end of screen shot -->
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<!-- begin of screen shot -->
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<table class="screenshot">
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<tr><td>
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<a name="snap2"></a>
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<b>Repairing the defective image.</b> The resulting image is still incomplete
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since about 23.000 sectors could not be read. These sectors are now
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reconstructed using
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the error correction data created with dvdisaster.
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During the recovery a maximum of 20 errors
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per error correction block is encountered. This results in a peak
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error correction load of 63%, meaning that this degree of damage is handled well
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by error correction data created with default settings.
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</td></tr>
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<tr><td align="center">
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<a href="index10.html#snap2">
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<img src="images/fix-image.png" alt="" class="noborder">
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</a>
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</td></tr>
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<tr><td align="center">Screen shot: Repairing the defective image.</td></tr>
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</table><pre> </pre>
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<!-- end of screen shot -->
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<b>Recovery needs error correction data:</b> The recovery process described above uses
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error correction ("ecc") data.
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Think of this data as a special
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form of backup data (it needs less space than a normal backup, though).
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Like an ordinary backup, the ecc data needs to be created
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<i>before</i> the medium goes defective.<p>
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So if you have a defective medium but never created ecc data for it - sorry,
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your data is probably lost.<p>
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<a href="index20.html">Why quality scans won't suffice...</a>
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<!-- do not change below -->
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</td> <!-- end of page contents -->
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</tr>
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<!--
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<tr valign="bottom">
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<td style="background-color:#f0f0f0;">
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<table cellpadding="10"><tr><td><a href="http://dvdisaster.net/legacy/en/index.html"><span class="fs"></span></a></td></tr></table>
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</td>
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<td></td>
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<td></td>
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</tr>
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-->
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</table> <!-- end of main body table -->
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<!-- Page footer -->
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<table width="100%" cellpadding="0" border="0">
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<tr><td colspan="2" style="width:100%; height:10px;"></td>
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</tr>
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<tr><td colspan="2" class="hsep"></td>
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</tr>
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<tr>
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<td align="center">
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<span class="fs">
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<i> Copyright 2004-2012 Carsten Gnörlich.<br>
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Verbatim copying and distribution of this entire article is permitted in any medium, provided this notice is preserved.
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</i>
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</span>
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</td>
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</tr>
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<tr><td colspan="2" class="hsep"></td>
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</tr>
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</table>
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</body>
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</html>
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