Imported Upstream version 0.72
This commit is contained in:
TANIGUCHI Takaki
223
documentation/en/howtos63.html
Normal file
223
documentation/en/howtos63.html
Normal file
@@ -0,0 +1,223 @@
|
||||
<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>
|
||||
|
||||
<!--- Title header --->
|
||||
<table width="100%" cellpadding="0" border="0">
|
||||
<tr>
|
||||
<td align="left">
|
||||
<font size="+3"><b>dvdisaster</b></font>
|
||||
<i>Version 0.72</i>
|
||||
</td>
|
||||
<td align="right">
|
||||
<font size="+3"> </font><a href="http://dvdisaster.net/en/">To the Internet version</a>
|
||||
<a href="../de/howtos63.html"></a>
|
||||
|
||||
<a href="../ru/howtos63.html"></a>
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
|
||||
<!--- Language chooser or separator --->
|
||||
<table width="100%" cellpadding="0" border="0">
|
||||
<tr bgcolor="#000000">
|
||||
<td colspan="2" width="100%"><img width=1 height=1 alt=""></td>
|
||||
</tr>
|
||||
<tr><td colspan="2" width="100%" height="10">
|
||||
<img width=1 height=1 alt="">
|
||||
</td></tr>
|
||||
</table>
|
||||
|
||||
<!--- Main body (Navigation, actual page content, optional news column) --->
|
||||
<table width="100%" cellspacing=0>
|
||||
<tr>
|
||||
<!--- Navigation --->
|
||||
<td bgcolor="#f0f0f0" valign="top" width="20%">
|
||||
<table width="100%" cellpadding="10">
|
||||
<tr>
|
||||
<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>
|
||||
</tr>
|
||||
</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%">·</td><td colspan=2><font size="-1"><a href="howtos60.html">The big picture</a></font></td></tr>
|
||||
<tr><td valign="top"></td><td>-</td><td><font size="-1"><a href="howtos61.html">error correction</a></font></td></tr>
|
||||
<tr><td valign="top"></td><td>-</td><td><font size="-1"><a href="howtos62.html">correct usage</a></font></td></tr>
|
||||
<tr><td valign="top"></td><td>-</td><td><font size="-1">incorrect usage</font></td></tr>
|
||||
<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>
|
||||
<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>
|
||||
<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>
|
||||
<tr><td valign="top" width="1%">·</td><td colspan=2><font size="-1"><a href="howtos40.html">Recovering media images</a></font></td></tr>
|
||||
<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>
|
||||
<tr><td valign="top" width="1%">·</td><td colspan=2><font size="-1"><a href="howtos90.html">Testing image compatibility</a></font></td></tr>
|
||||
<tr><td valign="top" width="1%">·</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>
|
||||
</table>
|
||||
</td>
|
||||
</tr>
|
||||
</table>
|
||||
</td>
|
||||
<td></td>
|
||||
|
||||
<!--- Actual page contents --->
|
||||
<td valign="top" width="77%" rowspan="2">
|
||||
|
||||
<!--- Insert actual page content below --->
|
||||
|
||||
<h3>Using dvdisaster the wrong way</h3>
|
||||
|
||||
Joe bets on his media keeping their content
|
||||
without additional protection.<p>
|
||||
|
||||
<table width="100%">
|
||||
<tr>
|
||||
<td width="15%">10. Feb. 2004</td>
|
||||
<td width="60px"><img src="../images/good-cd.png"></td>
|
||||
<td width="60px"><img src="../images/good-cd.png"></td>
|
||||
<td>Joe creates two CDs containing important data. But he does not
|
||||
make any provisions against data loss on those media.</td>
|
||||
</tr>
|
||||
<tr><td colspan="4"> <hr> </td></tr>
|
||||
<tr>
|
||||
<td>14. May 2005</td>
|
||||
<td><img align="top" src="../images/good-cd.png"></td>
|
||||
<td><img align="top" src="../images/good-cd.png"></td>
|
||||
<td>Joe uses his CDs regularly. After one year they are still perfectly
|
||||
readable.</td>
|
||||
</tr>
|
||||
<tr><td colspan="4"> <hr> </td></tr>
|
||||
<tr>
|
||||
<td>19. Aug 2007</td>
|
||||
<td><img align="top" src="../images/bad-cd.png"></td>
|
||||
<td><img align="top" src="../images/good-cd.png"></td>
|
||||
<td>After two more years Joe notices that some data on one CD is no
|
||||
longer readable.</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="right"><a href="howtos10.html">scanning</a></td>
|
||||
<td align="center"><img align="top" src="../images/down-arrow.png"></td>
|
||||
<td align="center"><img align="top" src="../images/down-arrow.png"></td>
|
||||
<td></td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>20. Aug 2007</td>
|
||||
<td><img align="top" src="../images/bad-cd.png"></td>
|
||||
<td><img align="top" src="../images/bad-cd.png"></td>
|
||||
<td>Joe downloads dvdisaster and performs
|
||||
<a href="howtos10.html">a read error scan</a>.
|
||||
He finds out that the CD contains 25000 unreadable sectors. A scan
|
||||
of the second CD reveals that it has developed 1500 unreadable sectors
|
||||
gone unnoticed so far. </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="right">reading</td>
|
||||
<td align="center"><img align="top" src="../images/down-arrow.png"></td>
|
||||
<td align="center"><img align="top" src="../images/down-arrow.png"></td>
|
||||
<td></td>
|
||||
</tr>
|
||||
<tr><td colspan="4"> <p> </td></tr>
|
||||
<tr>
|
||||
<td>21. Aug 2007</td>
|
||||
<td><img align="top" src="../images/bad-image.png"></td>
|
||||
<td><img align="top" src="../images/bad-image.png"></td>
|
||||
<td>Joe uses dvdisaster to
|
||||
read as much sectors as possible from the
|
||||
defective media. But since he does not have error correction data
|
||||
there is no way of recalculating the unreadable sectors.</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="right">many reading<br>attempts</td>
|
||||
<td align="center"><img align="top" src="../images/down-arrow.png"></td>
|
||||
<td align="center"><img align="top" src="../images/down-arrow.png"></td>
|
||||
<td></td>
|
||||
</tr>
|
||||
<tr><td colspan="4"> <p> </td></tr>
|
||||
<tr>
|
||||
<td>05. Sep 2007</td>
|
||||
<td><img align="top" src="../images/bad-image.png"></td>
|
||||
<td><img align="top" src="../images/good-image.png"></td>
|
||||
<td>Joe takes advantage of dvdisaster's feature to complete images
|
||||
through multiple reading passes. He moves the defective images to
|
||||
several computers to perform reading attempts with different drives.
|
||||
After two weeks of trying at least all missing sectors from the second
|
||||
CD have been read. However on the first CD still 21000 sectors
|
||||
remain unreadable by any drive he tried.</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="right">only one CD<br>recovered</td>
|
||||
<td align="center"><img align="top" src="../images/down-arrow.png"></td>
|
||||
<td align="center"><img align="top" src="../images/down-arrow.png"></td>
|
||||
<td></td>
|
||||
</tr>
|
||||
<tr><td colspan="4"> <p> </td></tr>
|
||||
<tr>
|
||||
<td>06. Sep 2007</td>
|
||||
<td><img align="top" src="../images/bad-cd.png"></td>
|
||||
<td><img align="top" src="../images/good-cd.png"></td>
|
||||
<td>Joe dismisses the first CD as unrecoverable and considers himself lucky
|
||||
to have a complete image from the second CD again.
|
||||
However if he had created error correction data in time, he'd probably <sup>1)</sup>
|
||||
saved two weeks of reading attempts and recovered the contents from both CDs.</td></tr>
|
||||
</table>
|
||||
<hr>
|
||||
<sup>1)</sup>The error correction assumes a typical aging process.
|
||||
If the CD gets severely damaged it becomes unrecoverable even with
|
||||
error correction data. Do not rely on dvdisaster alone for protecting
|
||||
important data; instead employ additional measures like creating
|
||||
additional copies on different types of media.
|
||||
|
||||
<!--- do not change below --->
|
||||
|
||||
</td> <!--- end of page contents --->
|
||||
|
||||
</tr>
|
||||
<tr valign="bottom">
|
||||
<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>
|
||||
</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" width="100%" height="10"><img width=1 height=1 alt=""></td>
|
||||
</tr>
|
||||
<tr bgcolor="#000000"><td colspan="2" width="100%"><img width=1 height=1 alt=""></td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="center">
|
||||
<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>
|
||||
</font>
|
||||
</td>
|
||||
</tr>
|
||||
<tr bgcolor="#000000"><td colspan="2" width="100%"><img width=1 height=1 alt=""></td>
|
||||
</tr>
|
||||
</table>
|
||||
</body>
|
||||
</html>
|
||||
Reference in New Issue
Block a user