246 lines
9.4 KiB
HTML
246 lines
9.4 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>dvdisaster</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 (pl1)</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/howtos59.html"></a>
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<a href="../ru/howtos59.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" 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"></td><td>-</td><td><font size="-1"><a href="howtos51.html">Show information</a></font></td></tr>
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<tr><td valign="top"></td><td>-</td><td><font size="-1"><a href="howtos52.html">Results for error correction files</a></font></td></tr>
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<tr><td valign="top"></td><td>-</td><td><font size="-1"><a href="howtos53.html">Results für augmented images</a></font></td></tr>
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<tr><td valign="top"></td><td>-</td><td><font size="-1">Examples</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>Examples</h3>
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You have already seen examples of
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<a href="howtos52_expand=1.html">good images and error correction files</a>
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and <a href="howtos53_expand=1.html">good images augmented with
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error correction data</a> on the previous pages.
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In the following some typical examples of error situations are presented:<p>
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<hr>
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Here are two typical cases of showing information for images
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which have not yet been fully recovered:<p>
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<!--- begin of screen shot --->
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<table>
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<tr>
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<td valign="top">
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<b>Image with unreadable sectors and error correction file</b>.
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The image shown here contains 6245 unreadable sectors; error correction
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data is present by means of an error correction file.
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<p>
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</td>
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<td>
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<a name="snap1"></a>
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<table class="thumbnail" width="160px">
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<tr><td><font size="-1">Image with unreadable sectors, RS01</font></td></tr>
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<tr><td><a href="howtos59_expand=1.html#snap1"><img src="thumbnails/compare-bad-rs01.png"></a></td></tr>
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</table>
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</td>
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</tr>
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</table><p>
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<!--- end of screen shot --->
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<!--- begin of screen shot --->
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<table>
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<tr>
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<td valign="top">
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<b>Image augmented with error correction data, containing unreadable sectors</b>.
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This image contains unreadable sectors towards its end. Especially the
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ECC section is affected since the error correction data is located
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at the end of the image. Please note that this does not weaken the
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error correction since its corrective power is independent from the
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error location: 10000 errors at the beginning of the medium are just as easy
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to correct as 10000 errors towards its end.<br>
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The RS02 encoder which was used for creating the error correction
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data is capable of predicting the odds of a successful image recovery.
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These are shown at the end of the error correction data output area.
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</td>
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<td>
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<a name="snap2"></a>
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<table class="thumbnail" width="160px">
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<tr><td><font size="-1">Image with unreadable sectors, RS02</font></td></tr>
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<tr><td><a href="howtos59_expand=2.html#snap2"><img src="thumbnails/compare-bad-rs02.png"></a></td></tr>
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</table>
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</td>
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</tr>
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</table><p>
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<!--- end of screen shot --->
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<hr>
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<!--- begin of screen shot --->
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<table>
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<tr>
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<td valign="top">
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<b>Image from aborted reading process</b>.
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This image is shorter than expected; this usually happens when
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the reading process is stopped prematurely.
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<p>
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</td>
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<td>
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<a name="snap3"></a>
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<table class="thumbnail" width="160px">
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<tr><td><font size="-1">Aborted read</font></td></tr>
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<tr><td><a href="howtos59_expand=3.html#snap3"><img src="thumbnails/compare-trunc-rs01.png"></a></td></tr>
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</table>
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</td>
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</tr>
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</table><p>
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<!--- end of screen shot --->
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<!--- begin of screen shot --->
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<table>
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<tr>
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<td valign="top">
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<b>Image is larger than expected</b>.
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This image is larger than expected; possible causes are discussed
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in the section about <a href="howtos90.html">image compatibility</a>.
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It may be possible to recover from this problem; see hints related to
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<a href="howtos91.html#err">using error correction files</a> and
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<a href="howtos92.html#err">using augmented images</a>.
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</td>
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<td>
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<a name="snap4"></a>
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<table class="thumbnail" width="160px">
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<tr><td><font size="-1">Image too large</font></td></tr>
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<tr><td><a href="howtos59_expand=4.html#snap4"><img src="thumbnails/compat-150-rs01.png"></a></td></tr>
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</table>
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</td>
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</tr>
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</table><p>
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<!--- end of screen shot --->
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<!--- begin of screen shot --->
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<table class="screenshot">
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<tr><td>
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<a name="snap5"></a>
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<b>Wrong error correction file</b>.
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The error correction file was created for a different image.
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This causes lots of CRC errors since the sectors have different contents.
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However the most important hint is:<p>
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Fingerprint: <font color="red">mismatch</font><p>
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This tells you that the error correction file does not belong to the image.
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</td></tr>
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<tr><td align="center">
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<a href="howtos59.html#snap5">
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<img src="images/compare-mismatch-rs01.png">
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</a>
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</td></tr>
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<tr><td align="center">Screen shot: Wrong error correction file</td></tr>
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</table><pre> </pre>
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<!--- end of screen shot --->
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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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