133 lines
5.3 KiB
PHP
133 lines
5.3 KiB
PHP
<?php
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# dvdisaster: English homepage translation
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# Copyright (C) 2004-2010 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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howto_headline("Creating error correction files", "Basic settings", "images/create-icon.png");
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?>
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<!--- Insert actual page content below --->
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<?php begin_screen_shot("Opening the configuration dialog.","global-prefs-invoke.png"); ?>
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<table><tr><td valign="top"><img src="../images/prefs-icon.png" valign="bottom"></td>
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<td>The following tabs are found in the configuration dialog.
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Open the dialog by selecting the symbol marked green in the screen shot
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(click the image to expand it). The symbol may look different
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due to the symbol theme you are using.</td>
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</tr></table>
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<?php end_screen_shot(); ?>
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<hr>
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<a name="read"><b>Settings for reading the image from the medium</b></a><p>
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<table width="100%" cellspacing="5">
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<tr>
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<td><img src="../images/good-image.png"></td>
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<td>If you already have an ISO image available you can skip
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the next two tabs and proceed with the <a href="#ecc">error correction settings</a>.
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But make sure that you really have an ISO type image; other formats like ".nrg"
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do not produce usable error correction data.
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</td>
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</tr>
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</table><p>
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<?php begin_screen_shot("\"Image\" tab.","create-prefs-image.png"); ?>
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<b>"Image" tab.</b> Make sure that the image size is determined
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using the "ISO/UDF" setting and that the linear reading strategy is selected.
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The required selections are marked green. Leave the other settings at their defaults.
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<p>
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<?php end_screen_shot(); ?>
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<pre> </pre>
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<?php begin_screen_shot("\"Drive\" tab.","create-prefs-drive.png"); ?>
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<b>"Drive" tab.</b> Reading data from the drive while it is spinning up
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can generate spurious error reports. Adjust the spin up time for your drive
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(typically 5-10 seconds) in the field marked green to make dvdisaster wait
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for the appropriate time.<p>
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Leave the other settings at the shown values.<p>
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<?php end_screen_shot(); ?>
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<?php begin_screen_shot("\"Read attempts\".","create-prefs-read-attempts.png"); ?>
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<b>"Read attempts".</b> The option "Read and analyse raw sectors" (marked green)
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uses additional information provided by the drive to check the integrity of read
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data. This is recommended as we are interested in creating
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error correction data from a properly read image.
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On the other hand since error correction data can only be created from fully
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readable media we do not need multiple reading attempts and caching of raw sectors
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as shown in the screen shot.
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<?php end_screen_shot(); ?>
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<hr>
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<a name="ecc"><b>Error correction settings</b></a><p>
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<?php begin_screen_shot("\"Error correction\" tab.","create-prefs-ecc.png"); ?>
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<b>"Error correction" tab.</b> First choose "Error correction file (RS01)" in
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the "Storage method" list (green marking). By picking the redundancy you will
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determine the maximum error correction capability: An error correction file
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with x% redundancy can correct up to x% of read errors under optimal circumstances.
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Since the best case is usually not encountered you should add some safety margin
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to the redundancy by picking one of the following choices (see yellow markings);
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<ul>
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<li>The "normal" and "high" presets provide a redundancy of 14.3% and 33.5%
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respectively. These two settings are very fast in creating error correction
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files due to optimized program code.</li>
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<li>You can freely choose the redundancy by activating the "other" item and dragging
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the slider.</li>
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<li>By activating the "Use at most" button you can specify the error correction
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file size in MB. dvdisaster will choose a suitable redundancy so that the
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error correction file will be close to but not larger than the specified size.
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</li>
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</ul>
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The redundancy will also determine the size of the error correction file;
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using x% redundancy will create an error correction file of about x% the size
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of the image. Using redundancies lower than the "normal" setting (14.3%) is not
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recommended as the error correction might be overloaded too quickly.
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<?php end_screen_shot(); ?>
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<?php begin_screen_shot("\"Files\" tab.","create-prefs-file.png"); ?>
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<b>"Files" tab.</b> If your operating system can not create files larger than 2GB
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then you must choose the "Split files " setting (marked green).
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In that case dvdisaster will
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create up to 100 segments called "medium00.iso", "medium01.iso" etc. instead
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of a single "medium.iso" file. Using this option results in a small performance hit.
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This option is mostly useful under Windows if the old FAT32 file system is still used.
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Leave the other settings off for the moment; suggestions for further
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<a href="howtos25.php">optimization</a> follow later.
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<?php end_screen_shot(); ?>
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<pre> </pre>
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<b>Not used tabs</b><p>
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The "Misc" tab currently has only functions for creating
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log files. This is helpful for sending in <a href="feedback.php">bug reports</a>
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but should be left off during normal operation.
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The "Appearance" tab allows you to adapt the output colors to your taste,
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but these have no further effects on the error correction data creation.
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<pre> </pre>
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<a href="howtos23.php">Creating the error correction data...</a>
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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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