Imported Upstream version 0.72
This commit is contained in:
TANIGUCHI Takaki
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documentation/en/howtos52_expand=1.html
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documentation/en/howtos52_expand=1.html
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<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>Overview</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</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/howtos52.html"></a>
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<a href="../ru/howtos52.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">Results for error correction files</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"><a href="howtos59.html">Examples</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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<!--- Insert actual page content below --->
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<h3>Results for error correction files</h3>
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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="snap1"></a>
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Comparing an image against its error correction file produces information
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in two output fields; each related to one of the files:
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</td></tr>
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<tr><td align="center">
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<a href="howtos52_expand=0.html#snap1">
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<img src="images/compat-okay-rs01.png">
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</a>
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</td></tr>
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<tr><td align="center">Screen shot: Image and error correction file.</td></tr>
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</table><!--- end of screen shot --->
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<table>
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<tr><td colspan="2">Output field <b>"Image file summary":</b><br><hr></td><td></td></tr>
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<tr>
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<td valign="top">Medium sectors:</td>
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<td>The number of sectors in the ISO image (one sector = 2KB).</td>
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</tr>
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<tr><td> </td><td></td></tr>
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<td valign="top">Checksum errors:</td>
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<td>The error correction file contains CRC32 checksums for each image
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sector. If this value is greater than zero some sectors were readable
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but their contents do not match the checksum. The error correction will
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try to recalculate the contents of these sectors.
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</td>
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</tr>
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<tr><td> </td><td></td></tr>
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<tr>
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<td valign="top">Missing sectors:</td>
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<td>This is the number of sectors which could not be read from the medium.
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The error correction will try to recover the contents of these sectors.
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</td>
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</tr>
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<tr><td> </td><td></td></tr>
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<tr>
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<td valign="top">Image checksum:</td>
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<td>A MD5 checksum is calculated for the complete ISO image.
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You can reproduce this value using the command line of GNU/Linux:<br>
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<tt>md5sum medium2.iso</tt></td>
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</tr>
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<tr><td> </td><td></td></tr>
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<tr><td colspan="2">
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If all values in this output field are okay the message
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"<font color="#008000">Good image.</font>" appears.
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Otherwise the most important error will be explained there.
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</td>
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</tr>
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<tr><td> </td><td></td></tr>
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<tr>
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<td colspan="2">Output field <b>"Error correction file summary"</b>:<br><hr></td><td></td>
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</tr>
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<tr>
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<td valign="top">Created by:</td>
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<td>Prints the dvdisaster version which was used for creating the
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error correction data. Alpha/developer versions are highlighted in red.</td>
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</tr>
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<tr><td> </td><td></td></tr>
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<tr>
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<td valign="top">Method:</td>
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<td>The method and redundancy used for creating the error correction file.</td>
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</tr>
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<tr><td> </td><td></td></tr>
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<tr>
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<td valign="top">Requires:</td>
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<td>Processing the error correction data requires at least the shown
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version of dvdisaster.</td>
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</tr>
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<tr><td> </td><td></td></tr>
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<tr>
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<td valign="top">Medium sectors:</td>
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<td>The expected number of sectors in the image file.</td>
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</tr>
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<tr><td> </td><td></td></tr>
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<tr>
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<td valign="top">Image checksum:</td>
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<td>The expected MD5 sum of the image file.</td>
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</tr>
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<tr><td> </td><td></td></tr>
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<tr>
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<td valign="top">Fingerprint:</td>
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<td>dvdisaster uses the checksum of a special sector to determine whether
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the error correction file was made for a given image.</td>
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</tr>
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<tr><td> </td><td></td></tr>
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<tr>
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<td valign="top">Ecc blocks:</td>
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<td>The error correction divides the image into small blocks which can
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be processed independently. This information is mostly useless as long
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as the number of ecc blocks is correct ;-)
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</td>
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</tr>
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<tr><td> </td><td></td></tr>
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<tr>
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<td valign="top">Ecc checksum:</td>
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<td>A MD5 checkum is calculated over the error correction file,
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not taking into account the first 4KB. You can reproduce this value
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using the command line of GNU/Linux:<br>
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<tt>tail -c +4097 medium.ecc | md5sum</tt>
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</td>
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</tr>
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<tr><td> </td><td></td></tr>
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<tr><td colspan="2">
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If all values in this output field are okay the message
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"<font color="#008000">Good error correction file.</font>" appears.
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Otherwise the most important error will be explained there.
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</td>
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</tr>
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</table>
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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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Reference in New Issue
Block a user