263 lines
9.8 KiB
HTML
263 lines
9.8 KiB
HTML
<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>Error messages</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 0.72.2 / 0.79 (devel-3)</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/qa20.html"></a>
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<a href="../ru/qa20.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></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 valign="top" width="1%">·</td><td colspan=2><font size="-1"><a href="qa10.html">Technical Questions</a></font></td></tr>
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<tr><td valign="top" width="1%">·</td><td colspan=2><font size="-1">Error messages</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>Error messages</h3>
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<a href="qa20.html#tao">3.1 "Warning: 2 sectors missing at the end of the disc".</a><p>
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<a href="qa20.html#block">3.2 Program blocks right after invocation.</a><p>
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<a href="qa20.html#crc">3.3 What does "CRC error, sector: n" mean?</a><p>
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<a href="qa20.html#rw">3.4 Read errors or wrong image size with -RW/+RW/-RAM media</a><p>
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<a href="qa20.html#dvdrom">3.5 My self-written media is recognized as "DVD-ROM" and rejected.</a><p>
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<a href="qa20.html#freebsd">3.6 No drives appear under FreeBSD.</a><p>
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<a href="qa20.html#v40error">3.7 "Ecc file has been created with version 0.40.7."</a><p>
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<hr><p>
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<b><a name="tao">3.1 "Warning: 2 sectors missing at the end of the disc"</a></b><p>
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This warning appears with CD media written in "TAO" (track at once) mode.
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Some drives report an image size which is 2 sectors too large for such media,
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producing 2 pseudo read errors at the end of the medium
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which do <i>not</i> mean data loss in this case.<p>
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Since the writing mode can not be determined from the medium, dvdisaster assumes
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a "TAO" CD if exactly the last two sectors are unreadable, and trims the image
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accordingly. It is up to you to decide whether this is okay. You can
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advise dvdisaster to treat these sectors as real read errors by using the
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--dao option or
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the preferences tab for reading/scanning.<p>
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To avoid these problems, consider using the "DAO / Disc at once" (sometimes
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also called "SAO / Session at once") mode for writing single session media.
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<div align=right><a href="qa20.html#top">↑</a></div>
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<b><a name="block">3.2 Program blocks right after invocation</a></b><p>
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Using old Linux kernel versions (kernel 2.4.x) the program occasionally
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blocks right after the start and before any actions are
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carried out. It can not be terminated using Ctrl-C or "kill -9".<p>
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Eject the medium to make the program terminate. Insert the medium again
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and wait until the drive recognizes the medium and spins down.
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Calling dvdisaster again should work now.
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<div align=right><a href="qa20.html#top">↑</a></div>
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<b><a name="crc">3.3 What does "CRC error, sector: n" mean?</a></b><p>
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The respective sector could be read, but the checksum of its contents does
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not match the value noted in the error correction file. Some possible causes are:<p>
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<ul>
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<li>The image has been mounted with write permission and
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was therefore altered (typical evidence: CRC errors in sector 64 and in
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sectors 200 to 400).</li>
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<li>The computer has some hardware problems, especially when
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communicating with its mass storage devices.</li>
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</ul>
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If you suspect technical problems, try creating another version of the image
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and error correction files and <a href="howtos50.html">verify
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them again</a>.
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When the error disappears or surfaces at a different location,
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your computer may be suffering from defective memory,
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broken drive cabling, or wrong CPU/system frequency settings.
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<div align=right><a href="qa20.html#top">↑</a></div>
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<b><a name="rw">3.4 Read errors or wrong image size with -RW/+RW/-RAM media</a></b><p>
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Some drives report incorrect image sizes when -RW/+RW/-RAM media are used. Two common
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cases are:<p>
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<table>
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<tr><td valign="top">Problem:</td>
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<td>The drive reports the size of the largest image ever written to the medium, not that
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of the actual image.
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</td></tr>
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<tr><td valign="top">Symptoms:</td>
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<td>After erasing a medium it is written with a file sized about 100MB.
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But the image read back is several GB long and contains the remainings
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of older images.
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</td></tr>
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<tr><td><pre> </pre></td><td></td></tr>
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<tr><td valign="top">Problem:</td>
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<td>The drive reports the maximum possible medium capacity (typically 2295104 sectors)
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instead of the number of actually used sectors.
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</td></tr>
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<tr><td valign="top">Symptoms:</td>
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<td>When reading beyond a certain point of the medium, only read errors occur,
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but all files on the medium are still readable and complete.
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</td></tr>
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</table><p>
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Possible remedy:<p>
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<table width=100%><tr><td bgcolor=#000000 width=2><img width=1 height=1 alt=""></td><td>
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Activate the option for determining the
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image size from the ISO/UDF file system or from the ECC/RS02 data.
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</td></tr></table><p>
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If the required ISO/UDF sectors are unreadable and you are using error correction files
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to recover damaged media there are two possible workarounds:
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<ul>
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<li>Execute the <a href="howtos50.html">"Verify"</a> function with only
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the error correction file being selected/given. Note down the correct image size
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from the output and restrict the
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reading range accordingly.
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</li>
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<li>Simply read in the image with the incorrect (larger) size.
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When invoking the <a href="howtos40.html#repair">"Fix"</a> function,
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answer "OK" when you are asked whether the image should be truncated.
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</li>
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</ul>
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<div align=right><a href="qa20.html#top">↑</a></div>
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<b><a name="dvdrom">3.5 My self-written media is recognized as "DVD-ROM" and rejected.</a></b><p>
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The medium book type has probably been set to "DVD-ROM". Typically, a drive
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capable of writing the same media format is required for processing the medium
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with dvdisaster.<p>
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For example, a two-layered DVD+R with a wrong book type
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may only be accepted on a burner which can write such media.<p>
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Try another drive for reading images in these cases.
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<div align=right><a href="qa20.html#top">↑</a></div>
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<b><a name="freebsd">3.6 No drives appear under FreeBSD.</a></b><p>
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<ul>
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<li>FreeBSD may require a <a href="download10.html#freebsd">kernel recompile</a>
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in order for ATAPI drives (nearly all current models) to become usable for
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dvdisaster.
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<li>You need read and write permission for the respective device
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(e.g. /dev/pass0).
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</ul>
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<div align=right><a href="qa20.html#top">↑</a></div>
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<b><a name="v40error">3.7 "Ecc file has been created with version 0.40.7."</a></b><p>
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The <a href="http://sourceforge.net/cvs/?group_id=157550">CVS versions</a>
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of dvdisaster mark their ecc files with a special bit. This causes dvdisaster
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versions upto 0.65 to falsely display the above error message. Please use the
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CVS versions only together with dvdisaster 0.66 or newer versions.
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<div align=right><a href="qa20.html#top">↑</a></div>
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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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<!---
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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"></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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--->
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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 2004-2010 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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