173 lines
6.0 KiB
HTML
173 lines
6.0 KiB
HTML
<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>dvdisaster</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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<font size="+3"><b>dvdisaster</b></font>
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<i>Version 0.72 (pl1)</i>
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</td>
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<td align="right">
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<font size="+3"> </font><a href="http://dvdisaster.net/en/">To the Internet version</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 bgcolor="#000000">
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<td colspan="2" width="100%"><img width=1 height=1 alt=""></td>
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</tr>
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<tr><td colspan="2" width="100%" height="10">
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<img width=1 height=1 alt="">
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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 bgcolor="#f0f0f0" valign="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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<font size="-1"><b>Contents</b></font>
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<table width="100%" cellpadding="0" cellspacing="0">
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<tr bgcolor="#000000">
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<td width="100%"><img width=1 height=1 alt=""></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><font size="-1"><a href="news.html">News</a></font></td></tr>
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<tr><td></td><td></td><td height="10"></td></tr>
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<tr><td colspan=3><font size="-1"><a href="index.html">Overview</a></font></td></tr>
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<tr><td valign="top" width="1%">·</td><td colspan=2><font size="-1">Examples of the error correction</font></td></tr>
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<tr><td valign="top" width="1%">·</td><td colspan=2><font size="-1"><a href="index20.html">dvdisaster complements quality scans</a></font></td></tr>
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<tr><td valign="top" width="1%">·</td><td colspan=2><font size="-1"><a href="index30.html">Pro and con of dvdisaster</a></font></td></tr>
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<tr><td></td><td></td><td height="10"></td></tr>
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<tr><td colspan=3><font size="-1"><a href="howtos.html">Howtos</a></font></td></tr>
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<tr><td></td><td></td><td height="10"></td></tr>
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<tr><td colspan=3><font size="-1"><a href="download.html">Download</a></font></td></tr>
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<tr><td></td><td></td><td height="10"></td></tr>
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<tr><td colspan=3><font size="-1"><a href="qa.html">Questions and Answers</a></font></td></tr>
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<tr><td></td><td></td><td height="10"></td></tr>
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<tr><td colspan=3><font size="-1"><a href="feedback.html">Bug reporting</a></font></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 valign="top" width="77%" rowspan="2">
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<!--- Insert actual page content below --->
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<h3>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 valign="top">
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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="160px">
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<tr><td><font size="-1">Reading the defective medium.</font></td></tr>
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<tr><td><a href="index10_expand=1.html#snap1"><img src="thumbnails/recover-linear.png"></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>
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<tr>
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<td valign="top">
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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>
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<td>
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<a name="snap2"></a>
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<table class="thumbnail" width="160px">
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<tr><td><font size="-1">Repairing the defective image.</font></td></tr>
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<tr><td><a href="index10_expand=2.html#snap2"><img src="thumbnails/fix-image.png"></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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<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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<tr valign="bottom">
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<td bgcolor="#f0f0f0">
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<table cellpadding="10"><tr><td><a href="http://dvdisaster.net/legacy/en/index.html"><font size="-1">Old documentation (V0.70)</font></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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</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" width="100%" height="10"><img width=1 height=1 alt=""></td>
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</tr>
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<tr bgcolor="#000000"><td colspan="2" width="100%"><img width=1 height=1 alt=""></td>
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</tr>
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<tr>
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<td align="center">
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<font size="-1">
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<i> Copyright 2004-2009 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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</font>
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</td>
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</tr>
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<tr bgcolor="#000000"><td colspan="2" width="100%"><img width=1 height=1 alt=""></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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