<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<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">
<link rel="alternate" type="application/atom+xml" href="http://dvdisaster.net/en/feed/atom.xml" title="dvdisaster news">
</head>
<body>
<!-- Title header -->
<table width="100%" cellpadding="0" border="0">
<tr>
<td align="left">
<span class="fxxl"><b>dvdisaster</b></span>
<i>Version 0.72.4 / 0.72 (pl4)</i>
</td>
<td align="right">
<span class="fxxl"> </span><a href="http://dvdisaster.net/en/">To the Internet version</a>
<a href="../cs/index.html"></a>
<a href="../de/index.html"></a>
<a href="../ru/index.html"></a>
</td>
</tr>
</table>
<!-- Language chooser or separator -->
<table width="100%" cellpadding="0" border="0">
<tr>
<td colspan="2" class="hsep"></td>
</tr>
<tr><td colspan="2" style="height: 10px">
</td></tr>
</table>
<!-- Main body (Navigation, actual page content, optional news column) -->
<table width="100%" cellspacing=0>
<tr>
<!-- Navigation -->
<td style="background-color:#f0f0f0; vertical-align:top; width:20%;">
<table width="100%" cellpadding="10">
<tr>
<td>
<span class="fs"><b>Contents</b></span>
<table width="100%" cellpadding="0" cellspacing="0">
<tr>
<td class="hsep"></td>
</tr>
</table><p>
<table width="100%">
<tr><td colspan=3><span class="fs"><a href="news.html">News</a></span></td></tr>
<tr><td></td><td></td><td style="height:10px;"></td></tr>
<tr><td colspan=3><span class="fs">Overview</span></td></tr>
<tr><td style="width:1%; vertical-align:top;">·</td><td colspan=2><span class="fs"><a href="index10.html">Examples of the error correction</a></span></td></tr>
<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>
<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>
<tr><td></td><td></td><td style="height:10px;"></td></tr>
<tr><td colspan=3><span class="fs"><a href="howtos.html">Howtos</a></span></td></tr>
<tr><td></td><td></td><td style="height:10px;"></td></tr>
<tr><td colspan=3><span class="fs"><a href="download.html">Download</a></span></td></tr>
<tr><td></td><td></td><td style="height:10px;"></td></tr>
<tr><td colspan=3><span class="fs"><a href="qa.html">Questions and Answers</a></span></td></tr>
<tr><td></td><td></td><td style="height:10px;"></td></tr>
<tr><td colspan=3><span class="fs"><a href="feedback.html">Bug reporting</a></span></td></tr>
</table>
</td>
</tr>
</table>
</td>
<td></td>
<!-- Actual page contents -->
<td style="vertical-align:top; width:57%;" rowspan="2">
<!-- Insert actual page content here -->
<h3 class="top">The dvdisaster project:</h3>
Optical media (CD,DVD,BD) keep their data only for a
finite time (typically for many years).
After that time, data loss develops slowly with read errors
growing from the outer media region towards the inside.<p>
<b>Archival with data loss protection</b><p>
dvdisaster stores data on CD/DVD/BD (<a href="qa10.html#media">supported media</a>)
in a way that it is fully recoverable even after some read errors have developed.
This enables you to rescue the complete data to a new medium.<p>
Data loss is prevented by
using error correcting codes.
Error correction data is either added to the medium or kept in separate
error correction files. dvdisaster works at
the image level so that the recovery
does not depend on the file system of the medium.
The maximum error correction capacity is user-selectable.<p>
<b>Common misunderstandings about dvdisaster:</b>
<ul>
<li>dvdisaster can not make defective media readable again.
Contents of a defective medium can <i>not</i> be recovered without the
error correction data.<p></li>
<li><img src="images/exclude_from_search_terms.png" alt="" class="valignm"><br>
Such functions are outside the scope of dvdisaster's internal design and goals.</li>
</ul>
<p>
<a href="index10.html">Examples of the error correction...</a>
</td> <!-- end of page contents -->
<!-- news flash column -->
<td></td>
<td style="background-color:#e0e0ff; width:20%;" valign="top">
<table width="100%" cellpadding="10"><tr><td>
<span class="fs"><b>News</b></span>
<a href="http://dvdisaster.net/en/feed/atom.xml"><img src="../images/atom16.png" alt="Subscribe to dvdisaster news feed" class="noborder"></a>
<table width="100%" cellpadding="0" cellspacing="0">
<tr>
<td class="hsep"></td>
</tr>
</table><p>
<table width="100%">
<tr><td>
<span class="fs">07.04.2012</span> <br>
<span class="fs">
<a href="news.html#item21">dvdisaster 0.72.4 released</a>
</span><p>
<span class="fs">05.10.2011</span> <br>
<span class="fs">
<a href="news.html#item20">dvdisaster 0.72.3 released</a>
</span><p>
<span class="fs">28.07.2011</span> <br>
<span class="fs">
<a href="news.html#item19">Documentation added</a>
</span><p>
<span class="fs">21.11.2010</span> <br>
<span class="fs">
<a href="news.html#item18">dvdisaster 0.79.3 released</a>
</span><p>
<span class="fs">07.11.2010</span> <br>
<span class="fs">
<a href="news.html#item17">Added Windows and Mac OS X versions for 0.72.2</a>
</span><p>
<span class="fs">31.10.2010</span> <br>
<span class="fs">
<a href="news.html#item16">dvdisaster 0.72.2 released</a>
</span><p>
<span class="fs">28.02.2010</span> <br>
<span class="fs">
<a href="news.html#item15">dvdisaster 0.79.2 released</a>
</span><p>
</td></tr>
</table>
</table>
</td> <!-- end of news flash column-->
</tr>
<!--
<tr valign="bottom">
<td style="background-color:#f0f0f0;">
<table cellpadding="10"><tr><td><a href="http://dvdisaster.net/legacy/en/index.html"><span class="fs"></span></a></td></tr></table>
</td>
<td></td>
<td></td>
</tr>
-->
</table> <!-- end of main body table -->
<!-- Page footer -->
<table width="100%" cellpadding="0" border="0">
<tr><td colspan="2" style="width:100%; height:10px;"></td>
</tr>
<tr><td colspan="2" class="hsep"></td>
</tr>
<tr>
<td align="center">
<span class="fs">
<i> Copyright 2004-2012 Carsten Gnörlich.<br>
Verbatim copying and distribution of this entire article is permitted in any medium, provided this notice is preserved.
</i>
</span>
</td>
</tr>
<tr><td colspan="2" class="hsep"></td>
</tr>
</table>
</body>
</html>
