378 lines
14 KiB
HTML
378 lines
14 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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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>with error correction files</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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<span class="fxxl"><b>dvdisaster</b></span>
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<i>Version 0.72.4 / 0.72 (pl4)</i>
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</td>
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<td align="right">
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<span class="fxxl"> </span><a href="http://dvdisaster.net/en/">To the Internet version</a>
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<a href="../cs/howtos91.html"></a>
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<a href="../de/howtos91.html"></a>
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<a href="../ru/howtos91.html"></a>
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<table width="100%" cellspacing=0>
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<td style="background-color:#f0f0f0; vertical-align: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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<span class="fs"><b>Contents</b></span>
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<table width="100%" cellpadding="0" cellspacing="0">
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<tr>
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<td class="hsep"></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><span class="fs"><a href="news.html">News</a></span></td></tr>
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<tr><td></td><td></td><td style="height:10px;"></td></tr>
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<tr><td colspan=3><span class="fs"><a href="index.html">Overview</a></span></td></tr>
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<tr><td></td><td></td><td style="height:10px;"></td></tr>
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<tr><td colspan=3><span class="fs"><a href="howtos.html">Howtos</a></span></td></tr>
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<tr><td style="width:1%; vertical-align:top;">·</td><td colspan=2><span class="fs"><a href="howtos60.html">The big picture</a></span></td></tr>
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<tr><td style="width:1%; vertical-align:top;">·</td><td colspan=2><span class="fs"><a href="howtos10.html">Scanning media for errors</a></span></td></tr>
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<tr><td style="width:1%; vertical-align:top;">·</td><td colspan=2><span class="fs"><a href="howtos20.html">Putting error correction data on a separate file</a></span></td></tr>
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<tr><td style="width:1%; vertical-align:top;">·</td><td colspan=2><span class="fs"><a href="howtos30.html">Putting error correction data on the medium</a></span></td></tr>
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<tr><td style="width:1%; vertical-align:top;">·</td><td colspan=2><span class="fs"><a href="howtos40.html">Recovering media images</a></span></td></tr>
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<tr><td style="width:1%; vertical-align:top;">·</td><td colspan=2><span class="fs"><a href="howtos50.html">Getting information about images and error correction data</a></span></td></tr>
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<tr><td style="width:1%; vertical-align:top;">·</td><td colspan=2><span class="fs"><a href="howtos90.html">Testing image compatibility</a></span></td></tr>
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<tr><td></td><td style="vertical-align:top; font-size:small;">-</td><td><span class="fs">with error correction files</span></td></tr>
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<tr><td></td><td style="vertical-align:top; font-size:small;">-</td><td><span class="fs"><a href="howtos92.html">when augmenting images with error correction data</a></span></td></tr>
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<tr><td style="width:1%; vertical-align:top;">·</td><td colspan=2><span class="fs"><a href="howtosa0.html">Dialogs and buttons</a></span></td></tr>
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<tr><td></td><td></td><td style="height:10px;"></td></tr>
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<tr><td colspan=3><span class="fs"><a href="download.html">Download</a></span></td></tr>
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<tr><td></td><td></td><td style="height:10px;"></td></tr>
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<tr><td colspan=3><span class="fs"><a href="qa.html">Questions and Answers</a></span></td></tr>
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<tr><td></td><td></td><td style="height:10px;"></td></tr>
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<tr><td colspan=3><span class="fs"><a href="feedback.html">Bug reporting</a></span></td></tr>
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</table>
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</td>
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</table>
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</td>
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<td></td>
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<td style="vertical-align:top; width:77%;" rowspan="2">
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<!-- Insert actual page content below -->
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<h3 class="top">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 class="w200x" align="center"><img src="../images/good-image.png" alt="Icon: Complete image">
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<p><img src="../images/down-fork-arrow.png" alt="Icon: Forked arrow"></td>
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<td> </td>
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<td class="valignt"><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_way=1.html">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 class="w100x" align="center">
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<img src="../images/good-cd.png" alt="Icon: Good medium (without read errors)" class="nobordervalignm"><p>
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<img src="../images/down-arrow.png" alt="Icon: Arrow down" class="noborder">
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</td>
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<td class="w100x" align="center" valign="top">
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<img src="../images/ecc.png" alt="Icon: Separate file with error correction data" class="nobordervalignm">
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</td>
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<td> </td>
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<td class="valignt"><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_way=3.html#c">write the medium</a>.
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Then perform these <a href="howtos22.html#ecc">basic settings</a> and
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<a href="howtos23_way=2.html">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 class="w100x" align="center">
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<img src="../images/good-image2.png" alt="Icon: Complete image from the previously written medium" class="noborder"><p>
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<img src="../images/down-arrow.png" alt="Icon: Arrow down" class="noborder">
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</td>
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<td class="w100x" align="center"> </td>
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<td> </td>
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<td class="valignt"><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.html#read">settings</a>
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and read the medium as described
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in <a href="howtos23_way=1.html">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 class="w200x" align="center">
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<a href="howtosa2.html">
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<img src="../images/select-image.png" alt="dvdisaster UI: Image file selection (input field and button)" class="noborder">
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<br><img src="../images/down-arrow.png" alt="Icon: Arrow down" class="noborder"></a></td>
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<td> </td>
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<td class="valignt"><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 class="w200x" align="center">
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<a href="howtosa3.html">
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<img src="../images/select-ecc.png" alt="dvdisaster UI: Error correction file selection (input field and button)" class="noborder">
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<br><img src="../images/down-arrow.png" alt="Icon: Arrow down" class="noborder"></a></td>
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<td> </td>
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<td class="valignt">
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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 class="w200x" align="center">
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<a href="howtosa4.html">
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<img src="images/compare-icon.png" alt="dvdisaster UI: Verify (button)" class="noborder">
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<br><img src="../images/down-arrow.png" alt="Icon: Arrow down" class="noborder"></a></td>
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<td> </td>
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<td class="valignt"><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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<!-- begin of screen shot -->
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<table>
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<tr>
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<td class="w200x" align="center">
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<a name="snap1"></a>
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<a href="howtos91_expand=1.html#snap1"> <img src="thumbnails/compat-okay-rs01.png" alt="" class="noborder">
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</a>
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</td><td> </td>
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<td class="valignt">
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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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</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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<a name="err"> </a>
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<b>Possible error causes and remedy:</b><p>
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<!-- begin of screen shot -->
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<table>
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<tr>
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<td class="w200x" align="center">
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<a name="snap2"></a>
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<a href="howtos91_expand=2.html#snap2"> <img src="thumbnails/compat-150-rs01.png" alt="" class="noborder">
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<br><img src="../images/down-arrow.png" alt="" class="noborder">
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</a>
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</td><td> </td>
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<td class="valignt">
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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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</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>
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<tr>
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<td class="w200x" align="center">
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<img src="images/fix-icon.png" alt="dvdisaster UI: Fix (button)" class="noborder">
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<p><img src="../images/down-arrow.png" alt="Icon: Arrow down" class="noborder"></td>
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<td> </td>
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<td class="valignt"><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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<!-- begin of screen shot -->
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<table>
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<tr>
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<td class="w200x" align="center">
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<a name="snap3"></a>
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<a href="howtos91_expand=3.html#snap3"> <img src="thumbnails/compat-dialog-rs01.png" alt="" class="noborder">
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<br><img src="../images/down-arrow.png" alt="" class="noborder">
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</a>
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</td><td> </td>
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<td class="valignt">
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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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</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>
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<tr>
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<td class="w200x" align="center">
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<img src="images/stop-icon.png" alt="dvdisaster UI: Stop (button)" class="noborder">
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<p><img src="../images/down-arrow.png" alt="Icon: Arrow down" class="noborder"></td>
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<td> </td>
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<td class="valignt"><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 class="w200x" align="center">
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<a href="howtosa4.html">
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<img src="images/compare-icon.png" alt="dvdisaster UI: Verify (button)" class="noborder">
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<br><img src="../images/down-arrow.png" alt="Icon: Arrow down" class="noborder"></a></td>
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<td> </td>
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<td class="valignt"><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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<!-- begin of screen shot -->
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<table class="screenshot">
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<tr><td>
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<a name="snap4"></a>
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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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</td></tr>
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<tr><td align="center">
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<a href="howtos91_expand=0.html#snap4">
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<img src="images/compat-okay-rs01.png" alt="" class="noborder">
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</a>
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</td></tr>
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<tr><td align="center">Screen shot: Show information.</td></tr>
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</table><!-- end of screen shot -->
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<span class="red">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.</span> <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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</td> <!-- end of page contents -->
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</tr>
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<tr><td colspan="2" class="hsep"></td>
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</tr>
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<tr>
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<td align="center">
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<span class="fs">
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<i> Copyright 2004-2012 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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</span>
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