297 lines
12 KiB
HTML
297 lines
12 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>Advanced settings</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 0.72.2 / 0.79 (devel-3)</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/howtos43.html"></a>
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<a href="../ru/howtos43.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"></td><td>-</td><td><font size="-1"><a href="howtos41.html">Basic settings</a></font></td></tr>
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<tr><td valign="top"></td><td>-</td><td><font size="-1"><a href="howtos42.html">Recovering the image</a></font></td></tr>
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<tr><td valign="top"></td><td>-</td><td><font size="-1">Advanced settings</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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<table width="100%" bgcolor="#f0f0f0">
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<tr><td><font size="+1"><b>Recovering media images</b></font></td>
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<td rowspan="2" align="right"><img src="images/create-icon.png"></td></tr>
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<tr><td><i>Advanced settings</i></td></tr>
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</table><p>
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The first attempt of <a href="howtos42.html">reading the defective medium</a>
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will usually provide enough data for the error correction. If it did not,
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try the following:<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>Estimating the chance of recovery</b><p>
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Examine the output of the reading process. Under the "Sectors processed" section
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you will find the actual percentage of readable sectors and how many percent will
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be needed for a full recovery. Using the difference between the two values
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(85.6% - 81.3% = 4.3% in the example) you can estimate the likelyhood of being able
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to collect enough sectors for a successful recovery:<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">Estimating the chance of recovery</font></td></tr>
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<tr><td><a href="howtos43_expand=1.html#snap1"><img src="thumbnails/adaptive-failure.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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<table cellspacing="0" cellpadding="10px">
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<tr bgcolor="#c0ffc0">
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<td width="10%" align="center" valign="top">< 5%</td>
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<td>Chances are good that you will get enough data using more reading attempts.
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</td></tr>
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<tr bgcolor="#ffffc0">
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<td width="10%" align="center" valign="top">5%-10%</td>
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<td> If you have several drives with different reading characteristics
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you may get the required data by being persistent and patient.
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</td></tr>
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<tr bgcolor="#ffe0c0">
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<td width="10%" align="center" valign="top">10%-20%</td>
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<td> You are in trouble. If the missing sectors do not drop significantly
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below 10% during the next 2-3 reading attempts the medium is probably unrecoverable.
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</td></tr>
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<tr bgcolor="#ffc0c0">
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<td width="10%" align="center" valign="top">> 20%</td>
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<td>Too much data loss; you can write this medium off as unrecoverable.
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To prevent this from happening again, use error correction data with
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higher redundancies and shorten the intervals for defect scanning.
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</td></tr>
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</table><p>
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Try the following settings one by one in further read attempts.
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Please perform a complete reading pass for each setting so that you
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learn how it affects the outcome (sometimes the results also differ
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depending on the drive used for reading). When you have gone through the list
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you may combine them into more powerful configurations.
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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>Perform another reading attempt</b><p>
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Do not alter any values except for setting a smaller value for terminating the
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reading process. Recommended values are: 32 for BD, 16 for DVD and 0 for CD (use
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the slider marked green). Perform another reading attempt using this setting.
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You can repeatedly read the medium as long as any pass
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provides a significant number of new sectors.<p>
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<b>Hint:</b> Let the drive cool down between the reading passes. Eject and load
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the medium before each pass; sometimes the medium comes to rest in a better
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position and the number of readable sectors improves.
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<p>
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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">Perform another reading attempt</font></td></tr>
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<tr><td><a href="howtos43_expand=2.html#snap2"><img src="thumbnails/fix-prefs-read-attempts1.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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<b>Complete the image using different drives</b><p>
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Perform additional reading attempts using different drives. Transfer the
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image to other computers to see if their drives can contribute more readable
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sectors.</b><p>
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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>Increase the number of reading attempts</b><p>
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<i>For all media types (CD, DVD, BD):</i><p>
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Set the number of reading attempts per sector to a minimum of 5 and a maximum of 9
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(green markings).<p>
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<i>Only for CD media:</i><p>
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Some drives are capable of partially reading defective sectors on CD media.
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Activate the "Raw sector caching" option and specify a directory where
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fragments of defective sectors should be stored (yellow markings).
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If enough fragments of a defective sector have been collected it may be possible
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to fully reconstruct it from that information.
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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">Increase the number of reading attempts</font></td></tr>
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<tr><td><a href="howtos43_expand=3.html#snap3"><img src="thumbnails/fix-prefs-read-attempts2.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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<i>Examining results of multiple reading attempts (CD, DVD, BD):</i><br>
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Not all drives show an improvement after increasing the number of reading attempts.
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Watch for messages of the form "Sector ..., try x: success" (highlighted in yellow).
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These indicate that
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the drive could read a sector after several reading attempts. If you never see such
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messages, increasing the number of reading attempts does not pay off for the
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respective drive.
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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">Multiple reading attempts</font></td></tr>
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<tr><td><a href="howtos43_expand=4.html#snap4"><img src="thumbnails/fix-reread-dvd.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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<a name="21h"></a>
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<i>Examining partial reading of defective CD sectors:</i><br>
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When the whole medium has been processed, look into the directory you entered
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above (/var/tmp/raw in the example). If no raw files have been created
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the drive may not support the required reading mode.
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However if you have several drives which do create raw files, then let them all
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work in the same raw file directory. Collecting raw sector fragments from
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different drives hightens the chance of reconstructing the defective sectors.
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<p>
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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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<i>Use a different raw reading mode for CD media:</i><br>
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Using the preset "20h" raw reading mode might not work on some drives.
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Perform another reading attempt using raw reading mode "21h" (see the screenshot).
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Check again whether some raw files have been created.
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</td></tr>
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<tr><td align="center">
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<a href="howtos43.html#snap5">
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<img src="images/fix-prefs-drive2.png">
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</a>
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</td></tr>
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<tr><td align="center">Screen shot: Use different raw reading mode</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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<!---
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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"></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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--->
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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 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 2004-2010 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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