Imported Upstream version 0.72
This commit is contained in:
TANIGUCHI Takaki
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documentation/en/howtos91.php
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documentation/en/howtos91.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>Testing compatibility between error correction files and ISO images</h3>
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<b>Motivation:</b> You want to write data to a medium and create an
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error correction file for it. In order to save time you do the following:
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<ol>
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<li>You create an ISO image using your CD/DVD/BD writing software.</li>
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<li>You write the image to a medium.</li>
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<li>You create the error correction file from the same image.</li>
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</ol>
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<b>Possible incompatibility:</b> The writing software creates a medium
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which does not exactly match the image. This might prevent the error
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correction from recovering the medium contents when it becomes defective.
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<p>
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<b>How to test compatibility:</b><p>
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Please note that some steps are only sketched out here;
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follow the links to the respective sections to find detailed instructions
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and examples.<p>
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<table>
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<tr>
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<td width="200px" align="center"><img src="../images/good-image.png">
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<p><img src="../images/down-fork-arrow.png"></td>
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<td> </td>
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<td valign="top"><b>Create an ISO image of the data</b> you want
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to write on the medium. If you need help on creating ISO images
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please refer to the
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<a href="howtos33.php?way=1">example of creating ISO images</a>.
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</td>
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</tr>
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</table>
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<table>
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<tr>
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<td width="100px" align="center">
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<img src="../images/good-cd.png" border="0" align="center"><p>
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<img src="../images/down-arrow.png" border="0">
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</td>
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<td width="100px" align="center" valign="top">
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<img src="../images/ecc.png" border="0" align="center">
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</td>
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<td> </td>
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<td valign="top"><b>Write the medium and create the error correction file.</b>
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Use the just created image to
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<a href="howtos33.php?way=3#c">write the medium</a>.
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Then perform these <a href="howtos22.php#ecc">basic settings</a> and
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<a href="howtos23.php?way=2">create an error correction file</a>
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from the image.
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</td>
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</tr>
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</table>
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<table>
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<tr>
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<td width="100px" align="center">
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<img src="../images/good-image2.png" border="0"><p>
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<img src="../images/down-arrow.png" border="0">
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</td>
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<td width="100px" align="center"> </td>
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<td> </td>
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<td valign="top"><b>Create a <i>second</i> image from the <i>written</i>
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medium.
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</b> Use these <a href="howtos22.php#read">settings</a>
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and read the medium as described
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in <a href="howtos23.php?way=1">creating an image</a>
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for making an error correction file. However you can stop the walk-through
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when the reading is finished as we do not need to create the error
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correction file again.
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</td>
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</tr>
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</table>
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<table>
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<tr>
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<td width="200px" align="center">
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<a href="howtosa2.php">
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<img src="../images/select-image.png" border="0">
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<br><img src="../images/down-arrow.png" border="0"></a></td>
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<td> </td>
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<td valign="top"><b>Enter the name of the <i>second</i> ISO image</b>
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which you have just read from the medium. Please note that the following
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test is useless when working with the image which was initially created
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using the CD/DVD/BD authoring software.
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</td>
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</tr>
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</table>
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<table>
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<tr>
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<td width="200px" align="center">
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<a href="howtosa3.php">
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<img src="../images/select-ecc.png" border="0">
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<br><img src="../images/down-arrow.png" border="0"></a></td>
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<td> </td>
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<td valign="top">
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<b>Enter the name of the error correction file</b>
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in case it is not already present from the previous actions.
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</td>
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</tr>
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</table>
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<table>
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<tr>
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<td width="200px" align="center">
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<a href="howtosa4.php">
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<img src="images/compare-icon.png" border="0">
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<br><img src="../images/down-arrow.png" border="0"></a></td>
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<td> </td>
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<td valign="top"><b>Start the evaluation</b> by clicking
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on the "Verify" button.</td>
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</tr>
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</table>
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<?php begin_howto_shot("Show information.","compat-okay-rs01.png", ""); ?>
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<b>Look at the verification results.</b>
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If you get the green messages "Good image." and "Good error correction file."
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your authoring software and dvdisaster are compatible. You can continue
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creating the error correction files directly from the ISO images produced
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by the authoring software.
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<?php end_howto_shot(); ?>
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<hr>
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<a name="err"> </a>
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<b>Possible error causes and remedy:</b><p>
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<?php begin_howto_shot("Wrong image size.","compat-150-rs01.png", "down-arrow.png"); ?>
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<b>Typical problem: wrong image size.</b>
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The verification may find out that the image is larger as expected.
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Typically the difference is 150 or 300 sectors for CD media and
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1-15 sectors for DVD/BD media. These might simply be zero padding sectors
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appended by the writing software. To find out if this really is the case
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do the following:
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<?php end_howto_shot(); ?>
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<table>
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<tr>
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<td width="200px" align="center">
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<img src="images/fix-icon.png" border="0">
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<p><img src="../images/down-arrow.png" border="0"></td>
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<td> </td>
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<td valign="top"><b>Start a recovery process.</b>
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</td>
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</tr>
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</table>
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<?php begin_howto_shot("Truncate the image.","compat-dialog-rs01.png", "down-arrow.png"); ?>
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<b>Confirm the dialog.</b>
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A dialog will appear asking you if it is okay to remove the superflous
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sectors from the image. Answer "OK".
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<?php end_howto_shot(); ?>
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<table>
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<tr>
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<td width="200px" align="center">
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<img src="images/stop-icon.png" border="0">
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<p><img src="../images/down-arrow.png" border="0"></td>
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<td> </td>
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<td valign="top"><b>Stop the recovery process,</b>
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as after truncating the image there is nothing more to do.
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</td>
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</tr>
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</table>
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<table>
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<tr>
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<td width="200px" align="center">
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<a href="howtosa4.php">
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<img src="images/compare-icon.png" border="0">
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<p><img src="../images/down-arrow.png" border="0"></a></td>
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<td> </td>
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<td valign="top"><b>Start the verification again</b>
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by clicking on the "Verify" button.</td>
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</tr>
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</table>
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<?php begin_howto_shot("Show information.","compat-okay-rs01.png", ""); ?>
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<b>Consider the new results.</b>
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If you now get the green messages "Good image." and "Good error correction
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file." your problem is purely cosmetic: The writing software has indeed
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added zero padding sectors while writing the medium.
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<?php end_howto_shot(); ?>
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<font color="#800000">If the problem persists after carrying out the above
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steps do <i>not</i> assume that dvdisaster and the writing software
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are compatible. The created error correction files will probably be
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unusable.</font> <p>
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Use the following method for creating the error correction files instead:
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<hr>
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<pre> </pre>
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<b>Alternative method avoiding incompatibilities:</b>
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<ol>
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<li>First write the data to the medium.</li>
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<li>Use dvdisaster to create an ISO image from the written medium.</li>
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<li>Use this image to create the error correction file.</li>
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</ol>
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This method takes more time due to the additional reading process,
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but it also has the advantage of testing the newly created
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medium for readability.
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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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