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<span class="fxxl"><b>dvdisaster</b></span>
<i>Version 0.72.4 / 0.72 (pl4)</i>
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<span class="fxxl"> </span><a href="http://dvdisaster.net/en/">To the Internet version</a>
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<span class="fs"><b>Contents</b></span>
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<tr><td colspan=3><span class="fs"><a href="news.html">News</a></span></td></tr>
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<tr><td colspan=3><span class="fs"><a href="index.html">Overview</a></span></td></tr>
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<tr><td colspan=3><span class="fs"><a href="howtos.html">Howtos</a></span></td></tr>
<tr><td style="width:1%; vertical-align:top;">·</td><td colspan=2><span class="fs"><a href="howtos60.html">The big picture</a></span></td></tr>
<tr><td style="width:1%; vertical-align:top;">·</td><td colspan=2><span class="fs"><a href="howtos10.html">Scanning media for errors</a></span></td></tr>
<tr><td style="width:1%; vertical-align:top;">·</td><td colspan=2><span class="fs"><a href="howtos20.html">Putting error correction data on a separate file</a></span></td></tr>
<tr><td style="width:1%; vertical-align:top;">·</td><td colspan=2><span class="fs"><a href="howtos30.html">Putting error correction data on the medium</a></span></td></tr>
<tr><td style="width:1%; vertical-align:top;">·</td><td colspan=2><span class="fs"><a href="howtos40.html">Recovering media images</a></span></td></tr>
<tr><td style="width:1%; vertical-align:top;">·</td><td colspan=2><span class="fs"><a href="howtos50.html">Getting information about images and error correction data</a></span></td></tr>
<tr><td></td><td style="vertical-align:top; font-size:small;">-</td><td><span class="fs"><a href="howtos51.html">Show information</a></span></td></tr>
<tr><td></td><td style="vertical-align:top; font-size:small;">-</td><td><span class="fs"><a href="howtos52.html">Results for error correction files</a></span></td></tr>
<tr><td></td><td style="vertical-align:top; font-size:small;">-</td><td><span class="fs"><a href="howtos53.html">Results for augmented images</a></span></td></tr>
<tr><td></td><td style="vertical-align:top; font-size:small;">-</td><td><span class="fs">Examples</span></td></tr>
<tr><td style="width:1%; vertical-align:top;">·</td><td colspan=2><span class="fs"><a href="howtos90.html">Testing image compatibility</a></span></td></tr>
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<h3 class="top">Examples</h3>
You have already seen examples of
<a href="howtos52_expand=1.html">good images and error correction files</a>
and <a href="howtos53_expand=1.html">good images augmented with
error correction data</a> on the previous pages.
In the following some typical examples of error situations are presented:<p>
<hr>
Here are two typical cases of showing information for images
which have not yet been fully recovered:<p>
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<b>Image with unreadable sectors and error correction file</b>.
The image shown here contains 6245 unreadable sectors; error correction
data is present by means of an error correction file.
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<tr><td><span class="fs">Image with unreadable sectors, RS01</span></td></tr>
<tr><td><a href="howtos59_expand=1.html#snap1"><img src="thumbnails/compare-bad-rs01.png" alt="" class="noborder"></a></td></tr>
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<b>Image augmented with error correction data, containing unreadable sectors</b>.
This image contains unreadable sectors towards its end. Especially the
ECC section is affected since the error correction data is located
at the end of the image. Please note that this does not weaken the
error correction since its corrective power is independent from the
error location: 10000 errors at the beginning of the medium are just as easy
to correct as 10000 errors towards its end.<br>
The RS02 encoder which was used for creating the error correction
data is capable of predicting the odds of a successful image recovery.
These are shown at the end of the error correction data output area.
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<tr><td><span class="fs">Image with unreadable sectors, RS02</span></td></tr>
<tr><td><a href="howtos59_expand=2.html#snap2"><img src="thumbnails/compare-bad-rs02.png" alt="" class="noborder"></a></td></tr>
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<b>Image from aborted reading process</b>.
This image is shorter than expected; this usually happens when
the reading process is stopped prematurely.
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<tr><td><span class="fs">Aborted read</span></td></tr>
<tr><td><a href="howtos59_expand=3.html#snap3"><img src="thumbnails/compare-trunc-rs01.png" alt="" class="noborder"></a></td></tr>
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<b>Image is larger than expected</b>.
This image is larger than expected; possible causes are discussed
in the section about <a href="howtos90.html">image compatibility</a>.
It may be possible to recover from this problem; see hints related to
<a href="howtos91.html#err">using error correction files</a> and
<a href="howtos92.html#err">using augmented images</a>.
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<tr><td><span class="fs">Image too large</span></td></tr>
<tr><td><a href="howtos59_expand=4.html#snap4"><img src="thumbnails/compat-150-rs01.png" alt="" class="noborder"></a></td></tr>
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<b>Wrong error correction file</b>.
The error correction file was created for a different image.
This causes lots of CRC errors since the sectors have different contents.
However the most important hint is:<p>
Fingerprint: <span class="red">mismatch</span><p>
This tells you that the error correction file does not belong to the image.
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<img src="images/compare-mismatch-rs01.png" alt="" class="noborder">
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<tr><td align="center">Screen shot: Wrong error correction file</td></tr>
</table><pre> </pre>
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<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.
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