/usr/share/doc/cedar-backup2-doc/manual/ch02s07.html is in cedar-backup2-doc 2.27.0-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 | <html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>Media and Device Types</title><link rel="stylesheet" type="text/css" href="styles.css"><meta name="generator" content="DocBook XSL Stylesheets V1.79.1"><link rel="home" href="index.html" title="Cedar Backup 2 Software Manual"><link rel="up" href="ch02.html" title="Chapter 2. Basic Concepts"><link rel="prev" href="ch02s06.html" title="Managed Backups"><link rel="next" href="ch02s08.html" title="Incremental Backups"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Media and Device Types</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="ch02s06.html">Prev</a> </td><th width="60%" align="center">Chapter 2. Basic Concepts</th><td width="20%" align="right"> <a accesskey="n" href="ch02s08.html">Next</a></td></tr></table><hr></div><div class="sect1"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="cedar-basic-mediadevice"></a>Media and Device Types</h2></div></div></div><p>
Cedar Backup is focused around writing backups to CD or DVD media
using a standard SCSI or IDE writer. In Cedar Backup terms, the
disc itself is referred to as the <em class="firstterm">media</em>, and
the CD/DVD drive is referred to as the <em class="firstterm">device</em>
or sometimes the <em class="firstterm">backup device</em>.
<a href="#ftn.idm350" class="footnote" name="idm350"><sup class="footnote">[10]</sup></a>
</p><p>
When using a new enough backup device, a new
<span class="quote">“<span class="quote">multisession</span>”</span> ISO image <a href="#ftn.idm354" class="footnote" name="idm354"><sup class="footnote">[11]</sup></a>
is written to the media on the first day of the week, and then
additional multisession images are added to the media each day that
Cedar Backup runs. This way, the media is complete and usable at the
end of every backup run, but a single disc can be used all week long.
If your backup device does not support multisession images — which is
really unusual today — then a new ISO image will be written to the
media each time Cedar Backup runs (and you should probably confine
yourself to the <span class="quote">“<span class="quote">daily</span>”</span> backup mode to avoid losing
data).
</p><p>
Cedar Backup currently supports four different kinds of CD media:
</p><div class="variablelist"><dl class="variablelist"><dt><span class="term">cdr-74</span></dt><dd><p>74-minute non-rewritable CD media</p></dd><dt><span class="term">cdrw-74</span></dt><dd><p>74-minute rewritable CD media</p></dd><dt><span class="term">cdr-80</span></dt><dd><p>80-minute non-rewritable CD media</p></dd><dt><span class="term">cdrw-80</span></dt><dd><p>80-minute rewritable CD media</p></dd></dl></div><p>
I have chosen to support just these four types of CD media because
they seem to be the most <span class="quote">“<span class="quote">standard</span>”</span> of the various types
commonly sold in the U.S. as of this writing (early 2005). If you
regularly use an unsupported media type and would like Cedar Backup to
support it, send me information about the capacity of the media in
megabytes (MB) and whether it is rewritable.
</p><p>
Cedar Backup also supports two kinds of DVD media:
</p><div class="variablelist"><dl class="variablelist"><dt><span class="term">dvd+r</span></dt><dd><p>Single-layer non-rewritable DVD+R media</p></dd><dt><span class="term">dvd+rw</span></dt><dd><p>Single-layer rewritable DVD+RW media</p></dd></dl></div><p>
The underlying <span class="command"><strong>growisofs</strong></span> utility does support other
kinds of media (including DVD-R, DVD-RW and BlueRay) which work
somewhat differently than standard DVD+R and DVD+RW media. I don't
support these other kinds of media because I haven't had any
opportunity to work with them. The same goes for dual-layer media of
any type.
</p><div class="footnotes"><br><hr style="width:100; text-align:left;margin-left: 0"><div id="ftn.idm350" class="footnote"><p><a href="#idm350" class="para"><sup class="para">[10] </sup></a>My original backup device was an old
Sony CRX140E 4X CD-RW drive. It has since died, and I currently
develop using a Lite-On 1673S DVD±RW drive.</p></div><div id="ftn.idm354" class="footnote"><p><a href="#idm354" class="para"><sup class="para">[11] </sup></a>An
<em class="firstterm">ISO image</em> is the standard way of creating a
filesystem to be copied to a CD or DVD. It is essentially a
<span class="quote">“<span class="quote">filesystem-within-a-file</span>”</span> and many UNIX operating
systems can actually mount ISO image files just like hard drives,
floppy disks or actual CDs. See Wikipedia for more information:
<a class="ulink" href="http://en.wikipedia.org/wiki/ISO_image" target="_top">http://en.wikipedia.org/wiki/ISO_image</a>.</p></div></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="ch02s06.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="ch02.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="ch02s08.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Managed Backups </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> Incremental Backups</td></tr></table></div></body></html>
|