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Imported Upstream version 0.72

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TANIGUCHI Takaki
2009-11-21 16:29:02 +09:00
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<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<title>Overview</title>
<link rel="stylesheet" type="text/css" href="../include/dvdisaster.css">
</head>
<body>
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<font size="+3"><b>dvdisaster</b></font>
<i>Version 0.72</i>
</td>
<td align="right">
<font size="+3">&nbsp;</font><a href="http://dvdisaster.net/en/">To the Internet version</a>
<a href="../de/howtos21.html"></a>
<a href="../ru/howtos21.html"></a>
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<tr><td colspan="2" width="100%" height="10">
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<!--- Navigation --->
<td bgcolor="#f0f0f0" valign="top" width="20%">
<table width="100%" cellpadding="10">
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<td>
<font size="-1"><b>Contents</b></font>
<table width="100%" cellpadding="0" cellspacing="0">
<tr bgcolor="#000000">
<td width="100%"><img width=1 height=1 alt=""></td>
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</table><p>
<table width="100%">
<tr><td colspan=3><font size="-1"><a href="news.html">News</a></font></td></tr>
<tr><td></td><td></td><td height="10"></td></tr>
<tr><td colspan=3><font size="-1"><a href="index.html">Overview</a></font></td></tr>
<tr><td></td><td></td><td height="10"></td></tr>
<tr><td colspan=3><font size="-1"><a href="howtos.html">Howtos</a></font></td></tr>
<tr><td valign="top" width="1%">&middot;</td><td colspan=2><font size="-1"><a href="howtos60.html">The big picture</a></font></td></tr>
<tr><td valign="top" width="1%">&middot;</td><td colspan=2><font size="-1"><a href="howtos10.html">Scanning media for errors</a></font></td></tr>
<tr><td valign="top" width="1%">&middot;</td><td colspan=2><font size="-1"><a href="howtos20.html">Putting error correction data on a separate file</a></font></td></tr>
<tr><td valign="top"></td><td>-</td><td><font size="-1">Decision help</font></td></tr>
<tr><td valign="top"></td><td>-</td><td><font size="-1"><a href="howtos22.html">Basic settings for reading</a></font></td></tr>
<tr><td valign="top"></td><td>-</td><td><font size="-1"><a href="howtos23.html">Creating the error correction file</a></font></td></tr>
<tr><td valign="top"></td><td>-</td><td><font size="-1"><a href="howtos24.html">Archiving error correction files</a></font></td></tr>
<tr><td valign="top"></td><td>-</td><td><font size="-1"><a href="howtos25.html">Advanced settings</a></font></td></tr>
<tr><td valign="top" width="1%">&middot;</td><td colspan=2><font size="-1"><a href="howtos30.html">Putting error correction data on the medium</a></font></td></tr>
<tr><td valign="top" width="1%">&middot;</td><td colspan=2><font size="-1"><a href="howtos40.html">Recovering media images</a></font></td></tr>
<tr><td valign="top" width="1%">&middot;</td><td colspan=2><font size="-1"><a href="howtos50.html">Getting information about images and error correction data</a></font></td></tr>
<tr><td valign="top" width="1%">&middot;</td><td colspan=2><font size="-1"><a href="howtos90.html">Testing image compatibility</a></font></td></tr>
<tr><td valign="top" width="1%">&middot;</td><td colspan=2><font size="-1"><a href="howtosa0.html">Dialogs and buttons</a></font></td></tr>
<tr><td></td><td></td><td height="10"></td></tr>
<tr><td colspan=3><font size="-1"><a href="download.html">Download</a></font></td></tr>
<tr><td></td><td></td><td height="10"></td></tr>
<tr><td colspan=3><font size="-1"><a href="qa.html">Questions and Answers</a></font></td></tr>
<tr><td></td><td></td><td height="10"></td></tr>
<tr><td colspan=3><font size="-1"><a href="feedback.html">Bug reporting</a></font></td></tr>
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<td></td>
<!--- Actual page contents --->
<td valign="top" width="77%" rowspan="2">
<table width="100%" bgcolor="#f0f0f0">
<tr><td><font size="+1"><b>Creating error correction data</b></font></td>
<td rowspan="2" align="right"><img src="images/create-icon.png"></td></tr>
<tr><td><i>Decision help</i></td></tr>
</table><p>
<!--- Insert actual page content below --->
<h3>Decision help</h3>
Error correction data can be either created in form of a separate error
correction file or it can be placed directly onto the medium.
Click on the answers to the following questions to find out which
method is most appropriate for you.<p>
<i>Do you need error correction data for a medium which already exists?</i>
<ul>
<li><a href="howtos21_answer=1.html" class="active">Yes, the medium has already been written.</a></li>
<li><a href="howtos21_answer=2.html" class="active">No, but I am planning to write the medium now.</a></li>
</ul>
<h3>More information on keeping error correction data</h3>
dvdisaster helps protecting your media from data loss by
forehanded<sup>*)</sup> creation of error correction data.
Error correction data must be treated like normal backup data, e.g.
you need to keep it available during the whole lifetime of the
respective medium.<p>
The easiest way is storing the error correction data on the medium
you want to protect. But this is only possible if the medium has not yet
been written: To employ this method you need to create an ISO image first,
then augment this image with error correction data, and finally write
the augmented image to the medium.<p>
If the medium has already been written, or insufficient space is left for
augmenting the image, you still can create error correction data in form
of a free-standing error correction file.
This file must then be stored somewhere else, e.g. you need to take additional
provisions to <a href="howtos24.html">archive</a> your error
correction files.<p>
More information about the pro and con of these methods
can be found in the <a href="http://dvdisaster.net/legacy/en/background30.html">old documentation</a>.
<pre> </pre>
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<a name="footnote"><sup>*)</sup>Let's repeat again for clarity: Error correction data must be created before the medium becomes defective. It is not possible to create error correction data from defective media; in that case unreadable sectors can not be recovered.</a>
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<td bgcolor="#f0f0f0">
<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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<font size="-1">
<i> Copyright 2004-2009 Carsten Gnörlich.<br>
Verbatim copying and distribution of this entire article is permitted in any medium, provided this notice is preserved.
</i>
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