Imported Upstream version 0.72
This commit is contained in:
TANIGUCHI Takaki
143
documentation/en/howtos52.php
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143
documentation/en/howtos52.php
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<?php
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# dvdisaster: English homepage translation
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# Copyright (C) 2004-2009 Carsten Gnörlich
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#
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# UTF-8 trigger: äöüß
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#
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# Include our PHP sub routines, then call begin_page()
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# to start the HTML page, insert the header,
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# navigation and news if appropriate.
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require("../include/dvdisaster.php");
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require("../include/screenshot.php");
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begin_page();
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?>
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<!--- Insert actual page content below --->
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<h3>Results for error correction files</h3>
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<?php begin_howto_shot("Image and error correction file.","compat-okay-rs01.png", ""); ?>
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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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<?php end_howto_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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<?php
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# end_page() adds the footer line and closes the HTML properly.
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end_page();
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?>
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