224 lines
9.0 KiB
HTML
224 lines
9.0 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>Overview</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</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/howtos63.html"></a>
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<a href="../ru/howtos63.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"></td><td>-</td><td><font size="-1"><a href="howtos61.html">error correction</a></font></td></tr>
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<tr><td valign="top"></td><td>-</td><td><font size="-1"><a href="howtos62.html">correct usage</a></font></td></tr>
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<tr><td valign="top"></td><td>-</td><td><font size="-1">incorrect usage</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" 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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<!--- Insert actual page content below --->
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<h3>Using dvdisaster the wrong way</h3>
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Joe bets on his media keeping their content
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without additional protection.<p>
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<table width="100%">
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<tr>
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<td width="15%">10. Feb. 2004</td>
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<td width="60px"><img src="../images/good-cd.png"></td>
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<td width="60px"><img src="../images/good-cd.png"></td>
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<td>Joe creates two CDs containing important data. But he does not
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make any provisions against data loss on those media.</td>
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</tr>
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<tr><td colspan="4"> <hr> </td></tr>
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<tr>
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<td>14. May 2005</td>
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<td><img align="top" src="../images/good-cd.png"></td>
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<td><img align="top" src="../images/good-cd.png"></td>
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<td>Joe uses his CDs regularly. After one year they are still perfectly
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readable.</td>
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</tr>
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<tr><td colspan="4"> <hr> </td></tr>
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<tr>
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<td>19. Aug 2007</td>
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<td><img align="top" src="../images/bad-cd.png"></td>
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<td><img align="top" src="../images/good-cd.png"></td>
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<td>After two more years Joe notices that some data on one CD is no
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longer readable.</td>
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</tr>
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<tr>
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<td align="right"><a href="howtos10.html">scanning</a></td>
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<td align="center"><img align="top" src="../images/down-arrow.png"></td>
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<td align="center"><img align="top" src="../images/down-arrow.png"></td>
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<td></td>
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</tr>
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<tr>
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<td>20. Aug 2007</td>
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<td><img align="top" src="../images/bad-cd.png"></td>
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<td><img align="top" src="../images/bad-cd.png"></td>
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<td>Joe downloads dvdisaster and performs
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<a href="howtos10.html">a read error scan</a>.
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He finds out that the CD contains 25000 unreadable sectors. A scan
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of the second CD reveals that it has developed 1500 unreadable sectors
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gone unnoticed so far. </td>
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</tr>
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<tr>
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<td align="right">reading</td>
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<td align="center"><img align="top" src="../images/down-arrow.png"></td>
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<td align="center"><img align="top" src="../images/down-arrow.png"></td>
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<td></td>
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</tr>
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<tr><td colspan="4"> <p> </td></tr>
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<tr>
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<td>21. Aug 2007</td>
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<td><img align="top" src="../images/bad-image.png"></td>
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<td><img align="top" src="../images/bad-image.png"></td>
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<td>Joe uses dvdisaster to
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read as much sectors as possible from the
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defective media. But since he does not have error correction data
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there is no way of recalculating the unreadable sectors.</td>
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</tr>
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<tr>
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<td align="right">many reading<br>attempts</td>
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<td align="center"><img align="top" src="../images/down-arrow.png"></td>
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<td align="center"><img align="top" src="../images/down-arrow.png"></td>
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<td></td>
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</tr>
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<tr><td colspan="4"> <p> </td></tr>
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<tr>
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<td>05. Sep 2007</td>
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<td><img align="top" src="../images/bad-image.png"></td>
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<td><img align="top" src="../images/good-image.png"></td>
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<td>Joe takes advantage of dvdisaster's feature to complete images
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through multiple reading passes. He moves the defective images to
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several computers to perform reading attempts with different drives.
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After two weeks of trying at least all missing sectors from the second
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CD have been read. However on the first CD still 21000 sectors
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remain unreadable by any drive he tried.</td>
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</tr>
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<tr>
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<td align="right">only one CD<br>recovered</td>
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<td align="center"><img align="top" src="../images/down-arrow.png"></td>
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<td align="center"><img align="top" src="../images/down-arrow.png"></td>
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<td></td>
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</tr>
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<tr><td colspan="4"> <p> </td></tr>
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<tr>
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<td>06. Sep 2007</td>
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<td><img align="top" src="../images/bad-cd.png"></td>
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<td><img align="top" src="../images/good-cd.png"></td>
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<td>Joe dismisses the first CD as unrecoverable and considers himself lucky
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to have a complete image from the second CD again.
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However if he had created error correction data in time, he'd probably <sup>1)</sup>
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saved two weeks of reading attempts and recovered the contents from both CDs.</td></tr>
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</table>
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<hr>
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<sup>1)</sup>The error correction assumes a typical aging process.
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If the CD gets severely damaged it becomes unrecoverable even with
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error correction data. Do not rely on dvdisaster alone for protecting
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important data; instead employ additional measures like creating
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additional copies on different types of media.
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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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