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Imported Upstream version 0.72.4

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TANIGUCHI Takaki
2012-04-08 21:33:59 +09:00
parent cef31abc8c
commit 2f23ea4b4a
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@@ -1,21 +1,22 @@
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<title>The big picture</title>
<link rel="stylesheet" type="text/css" href="../include/dvdisaster.css">
</head>
<body>
<!--- Title header --->
<!-- Title header -->
<table width="100%" cellpadding="0" border="0">
<tr>
<td align="left">
<font size="+3"><b>dvdisaster</b></font>
<i>Version 0.72 (pl3)</i>
<span class="fxxl"><b>dvdisaster</b></span>
<i>Version 0.72.4 / 0.72 (pl4)</i>
</td>
<td align="right">
<font size="+3">&nbsp;</font><a href="http://dvdisaster.net/en/">To the Internet version</a>
<span class="fxxl">&nbsp;</span><a href="http://dvdisaster.net/en/">To the Internet version</a>
<a href="../cs/howtos60.html"></a>
<a href="../de/howtos60.html"></a>
<a href="../ru/howtos60.html"></a>
@@ -23,55 +24,53 @@
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<td>
<font size="-1"><b>Contents</b></font>
<span class="fs"><b>Contents</b></span>
<table width="100%" cellpadding="0" cellspacing="0">
<tr bgcolor="#000000">
<td width="100%"><img width=1 height=1 alt=""></td>
<tr>
<td class="hsep"></td>
</tr>
</table><p>
<table width="100%">
<tr><td colspan=3><font size="-1"><a href="news.html">News</a></font></td></tr>
<tr><td></td><td></td><td height="10"></td></tr>
<tr><td colspan=3><font size="-1"><a href="index.html">Overview</a></font></td></tr>
<tr><td></td><td></td><td height="10"></td></tr>
<tr><td colspan=3><font size="-1"><a href="howtos.html">Howtos</a></font></td></tr>
<tr><td valign="top" width="1%">&middot;</td><td colspan=2><font size="-1">The big picture</font></td></tr>
<tr><td valign="top"></td><td>-</td><td><font size="-1"><a href="howtos61.html">error correction</a></font></td></tr>
<tr><td valign="top"></td><td>-</td><td><font size="-1"><a href="howtos62.html">correct usage</a></font></td></tr>
<tr><td valign="top"></td><td>-</td><td><font size="-1"><a href="howtos63.html">incorrect usage</a></font></td></tr>
<tr><td valign="top" width="1%">&middot;</td><td colspan=2><font size="-1"><a href="howtos10.html">Scanning media for errors</a></font></td></tr>
<tr><td valign="top" width="1%">&middot;</td><td colspan=2><font size="-1"><a href="howtos20.html">Putting error correction data on a separate file</a></font></td></tr>
<tr><td valign="top" width="1%">&middot;</td><td colspan=2><font size="-1"><a href="howtos30.html">Putting error correction data on the medium</a></font></td></tr>
<tr><td valign="top" width="1%">&middot;</td><td colspan=2><font size="-1"><a href="howtos40.html">Recovering media images</a></font></td></tr>
<tr><td valign="top" width="1%">&middot;</td><td colspan=2><font size="-1"><a href="howtos50.html">Getting information about images and error correction data</a></font></td></tr>
<tr><td valign="top" width="1%">&middot;</td><td colspan=2><font size="-1"><a href="howtos90.html">Testing image compatibility</a></font></td></tr>
<tr><td valign="top" width="1%">&middot;</td><td colspan=2><font size="-1"><a href="howtosa0.html">Dialogs and buttons</a></font></td></tr>
<tr><td></td><td></td><td height="10"></td></tr>
<tr><td colspan=3><font size="-1"><a href="download.html">Download</a></font></td></tr>
<tr><td></td><td></td><td height="10"></td></tr>
<tr><td colspan=3><font size="-1"><a href="qa.html">Questions and Answers</a></font></td></tr>
<tr><td></td><td></td><td height="10"></td></tr>
<tr><td colspan=3><font size="-1"><a href="feedback.html">Bug reporting</a></font></td></tr>
<tr><td colspan=3><span class="fs"><a href="news.html">News</a></span></td></tr>
<tr><td></td><td></td><td style="height:10px;"></td></tr>
<tr><td colspan=3><span class="fs"><a href="index.html">Overview</a></span></td></tr>
<tr><td></td><td></td><td style="height:10px;"></td></tr>
<tr><td colspan=3><span class="fs"><a href="howtos.html">Howtos</a></span></td></tr>
<tr><td style="width:1%; vertical-align:top;">&middot;</td><td colspan=2><span class="fs">The big picture</span></td></tr>
<tr><td></td><td style="vertical-align:top; font-size:small;">-</td><td><span class="fs"><a href="howtos61.html">error correction</a></span></td></tr>
<tr><td></td><td style="vertical-align:top; font-size:small;">-</td><td><span class="fs"><a href="howtos62.html">correct usage</a></span></td></tr>
<tr><td></td><td style="vertical-align:top; font-size:small;">-</td><td><span class="fs"><a href="howtos63.html">incorrect usage</a></span></td></tr>
<tr><td style="width:1%; vertical-align:top;">&middot;</td><td colspan=2><span class="fs"><a href="howtos10.html">Scanning media for errors</a></span></td></tr>
<tr><td style="width:1%; vertical-align:top;">&middot;</td><td colspan=2><span class="fs"><a href="howtos20.html">Putting error correction data on a separate file</a></span></td></tr>
<tr><td style="width:1%; vertical-align:top;">&middot;</td><td colspan=2><span class="fs"><a href="howtos30.html">Putting error correction data on the medium</a></span></td></tr>
<tr><td style="width:1%; vertical-align:top;">&middot;</td><td colspan=2><span class="fs"><a href="howtos40.html">Recovering media images</a></span></td></tr>
<tr><td style="width:1%; vertical-align:top;">&middot;</td><td colspan=2><span class="fs"><a href="howtos50.html">Getting information about images and error correction data</a></span></td></tr>
<tr><td style="width:1%; vertical-align:top;">&middot;</td><td colspan=2><span class="fs"><a href="howtos90.html">Testing image compatibility</a></span></td></tr>
<tr><td style="width:1%; vertical-align:top;">&middot;</td><td colspan=2><span class="fs"><a href="howtosa0.html">Dialogs and buttons</a></span></td></tr>
<tr><td></td><td></td><td style="height:10px;"></td></tr>
<tr><td colspan=3><span class="fs"><a href="download.html">Download</a></span></td></tr>
<tr><td></td><td></td><td style="height:10px;"></td></tr>
<tr><td colspan=3><span class="fs"><a href="qa.html">Questions and Answers</a></span></td></tr>
<tr><td></td><td></td><td style="height:10px;"></td></tr>
<tr><td colspan=3><span class="fs"><a href="feedback.html">Bug reporting</a></span></td></tr>
</table>
</td>
</tr>
@@ -79,12 +78,12 @@
</td>
<td></td>
<!--- Actual page contents --->
<td valign="top" width="77%" rowspan="2">
<!-- Actual page contents -->
<td style="vertical-align:top; width:77%;" rowspan="2">
<!--- Insert actual page content below --->
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<h3>The big picture - a comparison of dvdisaster with conventional backup</h3>
<h3 class="top">The big picture - a comparison of dvdisaster with conventional backup</h3>
dvdisaster stores data on CD/DVD/BD in a way that the data is fully recoverable even after
the medium has developed some read errors. The method employed in dvdisaster uses
@@ -96,24 +95,24 @@ Let's first consider how a conventional backup scheme works:<p>
<table width="100%">
<tr>
<td width="60px"><img src="../images/backup1.png"></td>
<td width="60px">Copy<br><img src="../images/right-arrow.png"></td>
<td width="60px"><img src="../images/backup2.png"></td>
<td class="w65x"><img src="../images/backup1.png" alt="Icon: Original medium"></td>
<td class="w65x">Copy<br><img src="../images/right-arrow.png" alt="Icon: Arrow right"></td>
<td class="w65x"><img src="../images/backup2.png" alt="Icon: Backup medium"></td>
<td> &nbsp; </td>
<td>An existing medium (1) is copied onto a backup medium (2).</td>
</tr>
<tr>
<td align="center"><img src="../images/down-arrow.png">&nbsp;&nbsp;</td>
<td align="center"><img src="../images/down-arrow.png" alt="Icon: Arrow down">&nbsp;&nbsp;</td>
<td></td>
<td align="center"><img src="../images/down-arrow.png">&nbsp;&nbsp;</td>
<td align="center"><img src="../images/down-arrow.png" alt="Icon: Arrow down">&nbsp;&nbsp;</td>
<td> </td>
</tr>
<tr>
<td width="60px"><img src="../images/bad-cd1.png"></td>
<td width="60px"> </td>
<td width="60px"><img src="../images/backup2.png"></td>
<td class="w65x"><img src="../images/bad-cd1.png" alt="Icon: Damaged medium"></td>
<td class="w65x"> </td>
<td class="w65x"><img src="../images/backup2.png" alt="Icon: Backup medium"></td>
<td></td>
<td>If any one of the two media is damaged afterwards, we still have
an intact medium left.</td>
@@ -138,9 +137,9 @@ This is where dvdisaster comes into play. Consider this:<p>
<table width="100%">
<tr>
<td width="60px"><img src="../images/good-cd.png"></td>
<td width="60px">Create<br><img src="../images/right-arrow.png"><br>ECC</td>
<td width="60px"><img src="../images/ecc.png"></td>
<td class="w65x"><img src="../images/good-cd.png" alt="Icon: Good medium (without read errors)"></td>
<td class="w65x">Create<br><img src="../images/right-arrow.png" alt="Icon: Arrow right"><br>ECC</td>
<td class="w65x"><img src="../images/ecc.png" alt="Icon: Separate file with error correction data"></td>
<td> &nbsp; </td>
<td>
This time we do not make a full backup. dvdisaster is used to create error correction data
@@ -150,16 +149,16 @@ The value of 20% was chosen to have a safety margin over the expected data loss
</tr>
<tr>
<td align="center"><img src="../images/down-arrow.png">&nbsp;&nbsp;</td>
<td align="center"><img src="../images/down-arrow.png" alt="Icon: Arrow down">&nbsp;&nbsp;</td>
<td></td>
<td align="center"><img src="../images/down-arrow.png">&nbsp;&nbsp;</td>
<td align="center"><img src="../images/down-arrow.png" alt="Icon: Arrow down">&nbsp;&nbsp;</td>
<td> </td>
</tr>
<tr>
<td><img src="../images/bad-cd.png"></td>
<td><img src="../images/bad-cd.png" alt="Icon: Damaged medium (partially unreadable)"></td>
<td> </td>
<td><img src="../images/ecc.png"></td>
<td><img src="../images/ecc.png" alt="Icon: Separate file with error correction data"></td>
<td> &nbsp; </td>
<td>
Wenn the medium fails at a later time,
@@ -169,9 +168,9 @@ error correction data.
</tr>
<tr>
<td align="right">80%<img src="../images/rdiag-arrow.png"></td>
<td align="right" class="w65x">80%<img src="../images/rdiag-arrow.png" alt="Icon: Diagonal arrow right"></td>
<td> </td>
<td align="left"><img src="../images/ldiag-arrow.png">20%</td>
<td align="left" class="w65x"><img src="../images/ldiag-arrow.png" alt="Icon: Diagonal arrow left">20%</td>
<td> </td>
<td>
For a successful recovery at least 80% of the data must still be readable from the medium,
@@ -180,7 +179,7 @@ and the remaining 20% are recalculated from the error correction data.</td>
<tr>
<td> </td>
<td> <img src="../images/good-image.png"></td>
<td> <img src="../images/good-image.png" alt="Icon: Complete image"></td>
<td> </td>
<td> </td>
<td>The completely recovered data is now available as an ISO image on the hard drive
@@ -190,7 +189,7 @@ and the remaining 20% are recalculated from the error correction data.</td>
<tr>
<td> </td>
<td align="center"><img src="../images/down-arrow.png"></td>
<td align="center"><img src="../images/down-arrow.png" alt="Icon: Arrow down"></td>
<td> </td>
<td> </td>
<td>Write the image to a blank medium using your favourite CD/DVD/BD authoring software.</td>
@@ -198,7 +197,7 @@ and the remaining 20% are recalculated from the error correction data.</td>
<tr>
<td> </td>
<td align="center"><img src="../images/good-cd.png"></td>
<td align="center"><img src="../images/good-cd.png" alt="Icon: Good medium (without read errors)"></td>
<td> </td>
<td> </td>
<td>You now have a new error-free medium.</td>
@@ -247,38 +246,40 @@ Of course these stories are purely fictional and any similarities with existing
persons or situations are purely conincidental.
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<table cellpadding="10"><tr><td><a href="http://dvdisaster.net/legacy/en/index.html"><font size="-1">Old documentation (V0.70)</font></a></td></tr></table>
<td style="background-color:#f0f0f0;">
<table cellpadding="10"><tr><td><a href="http://dvdisaster.net/legacy/en/index.html"><span class="fs"></span></a></td></tr></table>
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</table> <!--- end of main body table --->
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<td align="center">
<font size="-1">
<i> Copyright 2004-2011 Carsten Gnörlich.<br>
<span class="fs">
<i> Copyright 2004-2012 Carsten Gnörlich.<br>
Verbatim copying and distribution of this entire article is permitted in any medium, provided this notice is preserved.
</i>
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