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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></td><td style="vertical-align:top; font-size:small;">-</td><td><span class="fs"><a href="howtos21.html">Decision help</a></span></td></tr>
<tr><td></td><td style="vertical-align:top; font-size:small;">-</td><td><span class="fs">Basic settings for reading</span></td></tr>
<tr><td></td><td style="vertical-align:top; font-size:small;">-</td><td><span class="fs"><a href="howtos23.html">Creating the error correction file</a></span></td></tr>
<tr><td></td><td style="vertical-align:top; font-size:small;">-</td><td><span class="fs"><a href="howtos24.html">Archiving 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="howtos25.html">Advanced settings</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 style="width:1%; vertical-align:top;">·</td><td colspan=2><span class="fs"><a href="howtos90.html">Testing image compatibility</a></span></td></tr>
<tr><td style="width:1%; vertical-align:top;">·</td><td colspan=2><span class="fs"><a href="howtosa0.html">Dialogs and buttons</a></span></td></tr>
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<tr><td><span class="fl"><b>Creating error correction files</b></span></td>
<td rowspan="2" align="right"><img src="images/create-icon.png" alt=""></td></tr>
<tr><td><i>Basic settings</i></td></tr>
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<table><tr><td class="valignt"><img src="../images/prefs-icon.png" alt="dvdisaster UI: Preferences (button)" class="valignb"></td>
<td>The following tabs are found in the configuration dialog.
Open the dialog by selecting the symbol marked green in the screen shot
(click the image to expand it). The symbol may look different
due to the symbol theme you are using.</td>
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<tr><td><span class="fs">Opening the configuration dialog.</span></td></tr>
<tr><td><a href="howtos22_expand=1.html#snap1"><img src="thumbnails/global-prefs-invoke.png" alt="" class="noborder"></a></td></tr>
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<a name="read"><b>Settings for reading the image from the medium</b></a><p>
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<td><img src="../images/good-image.png" alt="Icon: Complete image"></td>
<td>If you already have an ISO image available you can skip
the next two tabs and proceed with the <a href="howtos22_expand=4.html#ecc">error correction settings</a>.
But make sure that you really have an ISO type image; other formats like ".nrg"
do not produce usable error correction data.
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<b>"Image" tab.</b> Make sure that the image size is determined
using the "ISO/UDF" setting and that the linear reading strategy is selected.
The required selections are marked green. Leave the other settings at their defaults.
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<tr><td><span class="fs">"Image" tab.</span></td></tr>
<tr><td><a href="howtos22_expand=2.html#snap2"><img src="thumbnails/create-prefs-image.png" alt="" class="noborder"></a></td></tr>
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<pre> </pre>
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<b>"Drive" tab.</b> Reading data from the drive while it is spinning up
can generate spurious error reports. Adjust the spin up time for your drive
(typically 5-10 seconds) in the field marked green to make dvdisaster wait
for the appropriate time.<p>
Leave the other settings at the shown values.<p>
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<tr><td><span class="fs">"Drive" tab.</span></td></tr>
<tr><td><a href="howtos22_expand=3.html#snap3"><img src="thumbnails/create-prefs-drive.png" alt="" class="noborder"></a></td></tr>
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<b>"Read attempts".</b> The option "Read and analyse raw sectors" (marked green)
uses additional information provided by the drive to check the integrity of read
data. This is recommended as we are interested in creating
error correction data from a properly read image.
On the other hand since error correction data can only be created from fully
readable media we do not need multiple reading attempts and caching of raw sectors
as shown in the screen shot.
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<img src="images/create-prefs-read-attempts.png" alt="" class="noborder">
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<tr><td align="center">Screen shot: "Read attempts".</td></tr>
</table><pre> </pre>
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<hr>
<a name="ecc"><b>Error correction settings</b></a><p>
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<b>"Error correction" tab.</b> First choose "Error correction file (RS01)" in
the "Storage method" list (green marking). By picking the redundancy you will
determine the maximum error correction capability: An error correction file
with x% redundancy can correct up to x% of read errors under optimal circumstances.
Since the best case is usually not encountered you should add some safety margin
to the redundancy by picking one of the following choices (see yellow markings);
<ul>
<li>The "normal" and "high" presets provide a redundancy of 14.3% and 33.5%
respectively. These two settings are very fast in creating error correction
files due to optimized program code.</li>
<li>You can freely choose the redundancy by activating the "other" item and dragging
the slider.</li>
<li>By activating the "Use at most" button you can specify the error correction
file size in MB. dvdisaster will choose a suitable redundancy so that the
error correction file will be close to but not larger than the specified size.
</li>
</ul>
The redundancy will also determine the size of the error correction file;
using x% redundancy will create an error correction file of about x% the size
of the image. Using redundancies lower than the "normal" setting (14.3%) is not
recommended as the error correction might be overloaded too quickly.
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<tr><td><span class="fs">"Error correction" tab.</span></td></tr>
<tr><td><a href="howtos22_expand=5.html#snap5"><img src="thumbnails/create-prefs-ecc.png" alt="" class="noborder"></a></td></tr>
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<b>"Files" tab.</b> In this tab, leave the settings off for the moment;
suggestions for further
<a href="howtos25.html">optimization</a> follow later.
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<tr><td><span class="fs">"Files" tab.</span></td></tr>
<tr><td><a href="howtos22_expand=6.html#snap6"><img src="thumbnails/create-prefs-file.png" alt="" class="noborder"></a></td></tr>
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<pre> </pre>
<b>Not used tabs</b><p>
The "Misc" tab currently has only functions for creating
log files. This is helpful for sending in <a href="feedback.html">bug reports</a>
but should be left off during normal operation.
The "Appearance" tab allows you to adapt the output colors to your taste,
but these have no further effects on the error correction data creation.
<pre> </pre>
<a href="howtos23.html">Creating the error correction data...</a>
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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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