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type="topic" style="tip"
id="disk-partitions">
<info>
<link type="guide" xref="disk"/>
<credit type="author">
<name>GNOME Documentation Project</name>
<email>gnome-doc-list@gnome.org</email>
</credit>
<revision pkgversion="3.4.0" date="2012-02-19" status="review"/>
<revision version="13.10" date="2013-10-23" status="review"/>
<desc>Understand what volumes and partitions are and use the disk utility
to manage them.</desc>
<include href="legal.xml" xmlns="http://www.w3.org/2001/XInclude"/>
</info>
<title>Manage volumes and partitions</title>
<p>The word <em>volume</em> is used to describe a storage device, like a hard
disk. It can also refer to a <em>part</em> of the storage on that device,
because you can split the storage up into chunks. The computer makes this
storage accessible via your file system in a process referred to as
<em>mounting</em>. Mounted volumes may be hard drives, USB drives, DVD-RWs, SD
cards, and other media. If a volume is currently mounted, you can read (and
possibly write) files on it.</p>
<p>Often, a mounted volume is called a <em>partition</em>, though they are not
necessarily the same thing. A “partition” refers to a <em>physical</em> area of
storage on a single disk drive. Once a partition has been mounted, it can be
referred to as a volume because you can access the files on it. You can think
of volumes as the labeled, accessible “storefronts” to the functional “back
rooms” of partitions and drives.</p>
<section id="manage">
<title>View and manage volumes and partitions using the disk utility</title>
<p>You can check and modify your computer's storage volumes with the disk
utility.</p>
<steps>
<item>
<p>Open the <gui>Dash</gui> and start the <app>Disk Utility</app> application.</p>
</item>
<item>
<p> In the pane marked <gui>Storage Devices</gui>, you will find hard disks,
CD/DVD drives, and other physical devices. Click the device you want to
inspect.</p>
</item>
<item>
<p> In the right pane, the area labeled <gui>Volumes</gui> provides a visual
breakdown of the volumes and partitions present on the selected device. It
also contains a variety of tools used to manage these volumes.</p>
<p>Be careful: it is possible to completely erase the data on your disk with
these utilities.</p>
</item>
</steps>
<p>Your computer most likely has at least one <em>primary</em> partition and a
single <em>swap</em> partition. The swap partition is used by the operating
system for memory management, and is rarely mounted. The primary partition
contains your operating system, applications, settings, and personal files.
These files can also be distributed among multiple partitions for security or
convenience.</p>
<p>One primary partition must contain information that your computer uses to
start up, or <em>boot</em>. For this reason it is sometimes called a boot
partition, or boot volume. To determine if a volume is bootable, look at its
<gui>Partition Flags</gui> in the disk utility. External media such as USB
drives and CDs may also contain a bootable volume.</p>
</section>
</page>
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