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(itstool) path: example/title
26/260
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Assorted non-standard <acronym>CD-ROM</acronym> drives
<literal>mcd</literal> for Mitsumi <acronym>CD-ROM</acronym> and <literal>scd</literal> for Sony <acronym>CD-ROM</acronym> devices
<acronym>SCSI</acronym> tape drives
<literal>sa</literal>
<acronym>IDE</acronym> tape drives
<literal>ast</literal>
RAID drives
Examples include <literal>aacd</literal> for <trademark class="registered">Adaptec</trademark> AdvancedRAID, <literal>mlxd</literal> and <literal>mlyd</literal> for <trademark class="registered">Mylex</trademark>, <literal>amrd</literal> for AMI <trademark class="registered">MegaRAID</trademark>, <literal>idad</literal> for Compaq Smart RAID, <literal>twed</literal> for <trademark class="registered">3ware</trademark> RAID.
Sample Disk, Slice, and Partition Names
Name
Meaning
<literal>ada0s1a</literal>
The first partition (<literal>a</literal>) on the first slice (<literal>s1</literal>) on the first <acronym>SATA</acronym> disk (<literal>ada0</literal>).
<literal>da1s2e</literal>
The fifth partition (<literal>e</literal>) on the second slice (<literal>s2</literal>) on the second SCSI disk (<literal>da1</literal>).
Conceptual Model of a Disk
This diagram shows FreeBSD's view of the first <acronym>SATA</acronym> disk attached to the system. Assume that the disk is 250 GB in size, and contains an 80 GB slice and a 170 GB slice (<trademark class="registered">MS-DOS</trademark> partitions). The first slice contains a <trademark class="registered">Windows</trademark> <acronym>NTFS</acronym> file system, <filename>C:</filename>, and the second slice contains a FreeBSD installation. This example FreeBSD installation has four data partitions and a swap partition.
The four partitions each hold a file system. Partition <literal>a</literal> is used for the root file system, <literal>d</literal> for <filename>/var/</filename>, <literal>e</literal> for <filename>/tmp/</filename>, and <literal>f</literal> for <filename>/usr/</filename>. Partition letter <literal>c</literal> refers to the entire slice, and so is not used for ordinary partitions.
_ external ref='basics/disk-layout' md5='__failed__'
Mounting and Unmounting File Systems
The file system is best visualized as a tree, rooted, as it were, at <filename>/</filename>. <filename>/dev</filename>, <filename>/usr</filename>, and the other directories in the root directory are branches, which may have their own branches, such as <filename>/usr/local</filename>, and so on.
<primary>root file system</primary>
There are various reasons to house some of these directories on separate file systems. <filename>/var</filename> contains the directories <filename>log/</filename>, <filename>spool/</filename>, and various types of temporary files, and as such, may get filled up. Filling up the root file system is not a good idea, so splitting <filename>/var</filename> from <filename>/</filename> is often favorable.
Another common reason to contain certain directory trees on other file systems is if they are to be housed on separate physical disks, or are separate virtual disks, such as Network File System mounts, described in <xref linkend="network-nfs"/>, or CDROM drives.
The <filename>fstab</filename> File
<primary>file systems</primary> <secondary>mounted with fstab</secondary>
During the boot process (<xref linkend="boot"/>), file systems listed in <filename>/etc/fstab</filename> are automatically mounted except for the entries containing <option>noauto</option>. This file contains entries in the following format:
<replaceable>device</replaceable> <replaceable>/mount-point</replaceable> <replaceable>fstype</replaceable> <replaceable>options</replaceable> <replaceable>dumpfreq</replaceable> <replaceable>passno</replaceable>
<literal>device</literal>
An existing device name as explained in <xref linkend="disks-naming"/>.
<literal>mount-point</literal>

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Glossary

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Source information

Source string comment
(itstool) path: example/title
Flags
read-only
Source string location
book.translate.xml:8072
String age
a year ago
Source string age
a year ago
Translation file
books/handbook.pot, string 1311