179 lines
8.2 KiB
HTML
179 lines
8.2 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>Decision help</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 0.72.1 / 0.79 (devel-2)</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/howtos21.html"></a>
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<a href="../ru/howtos21.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></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 valign="top" width="1%">·</td><td colspan=2><font size="-1"><a href="howtos60.html">The big picture</a></font></td></tr>
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<tr><td valign="top" width="1%">·</td><td colspan=2><font size="-1"><a href="howtos10.html">Scanning media for errors</a></font></td></tr>
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<tr><td valign="top" width="1%">·</td><td colspan=2><font size="-1"><a href="howtos20.html">Putting error correction data on a separate file</a></font></td></tr>
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<tr><td valign="top"></td><td>-</td><td><font size="-1">Decision help</font></td></tr>
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<tr><td valign="top"></td><td>-</td><td><font size="-1"><a href="howtos22.html">Basic settings for reading</a></font></td></tr>
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<tr><td valign="top"></td><td>-</td><td><font size="-1"><a href="howtos23.html">Creating the error correction file</a></font></td></tr>
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<tr><td valign="top"></td><td>-</td><td><font size="-1"><a href="howtos24.html">Archiving error correction files</a></font></td></tr>
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<tr><td valign="top"></td><td>-</td><td><font size="-1"><a href="howtos25.html">Advanced settings</a></font></td></tr>
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<tr><td valign="top" width="1%">·</td><td colspan=2><font size="-1"><a href="howtos30.html">Putting error correction data on the medium</a></font></td></tr>
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<tr><td valign="top" width="1%">·</td><td colspan=2><font size="-1"><a href="howtos40.html">Recovering media images</a></font></td></tr>
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<tr><td valign="top" width="1%">·</td><td colspan=2><font size="-1"><a href="howtos50.html">Getting information about images and error correction data</a></font></td></tr>
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<tr><td valign="top" width="1%">·</td><td colspan=2><font size="-1"><a href="howtos90.html">Testing image compatibility</a></font></td></tr>
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<tr><td valign="top" width="1%">·</td><td colspan=2><font size="-1"><a href="howtosa0.html">Dialogs and buttons</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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<table width="100%" bgcolor="#f0f0f0">
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<tr><td><font size="+1"><b>Creating error correction data</b></font></td>
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<td rowspan="2" align="right"><img src="images/create-icon.png"></td></tr>
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<tr><td><i>Decision help</i></td></tr>
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</table><p>
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<!--- Insert actual page content below --->
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<h3>Decision help</h3>
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Error correction data can be either created in form of a separate error
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correction file or it can be placed directly onto the medium.
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Click on the answers to the following questions to find out which
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method is most appropriate for you.<p>
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<i>Do you need error correction data for a medium which already exists?</i>
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<ul>
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<li><a href="howtos21_answer=1.html" class="passive">Yes, the medium has already been written.</a></li>
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<li><a href="howtos21_answer=2.html" class="active">No, but I am planning to write the medium now.</a></li>
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</ul>
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<i>How many free space is left on the medium?</i>
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<ul>
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<li><a href="howtos21_answer=3.html" class="active">The medium has more then 20% free space left.</a></li>
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<li><a href="howtos21_answer=4.html" class="passive">The medium is full or nearly full (less then 20% free)</a></li>
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</ul>
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You can put the error correction data <a href="howtos33.html">directly onto the medium</a>.
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To do so you must create an ISO image first and then augment it
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with error correction data before you write it to the medium.
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<h3>More information on keeping error correction data</h3>
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dvdisaster helps protecting your media from data loss by
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forehanded<sup>*)</sup> creation of error correction data.
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Error correction data must be treated like normal backup data, e.g.
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you need to keep it available during the whole lifetime of the
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respective medium.<p>
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The easiest way is storing the error correction data on the medium
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you want to protect. But this is only possible if the medium has not yet
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been written: To employ this method you need to create an ISO image first,
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then augment this image with error correction data, and finally write
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the augmented image to the medium.<p>
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If the medium has already been written, or insufficient space is left for
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augmenting the image, you still can create error correction data in form
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of a free-standing error correction file.
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This file must then be stored somewhere else, e.g. you need to take additional
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provisions to <a href="howtos24.html">archive</a> your error
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correction files.<p>
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More information about the pro and con of these methods
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can be found in the <a href="http://dvdisaster.net/legacy/en/background30.html">old documentation</a>.
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<pre> </pre>
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<!--- do not change below --->
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<table width="30%" cellpadding="0"><tr bgcolor="#000000"><td><img width=1 height=1 alt=""></td></tr></table>
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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> <!--- 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 bgcolor="#f0f0f0">
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<table cellpadding="10"><tr><td><a href="http://dvdisaster.net/legacy/en/index.html"><font size="-1"></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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--->
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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 2004-2010 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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