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|
<HTML
><HEAD
><TITLE
>Partitions</TITLE
><META
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><HR
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><DIV
CLASS="sect1"
><H1
CLASS="sect1"
><A
NAME="AEN1158"
></A
>6.7. Partitions</H1
><P
>A hard disk can be divided into several
<I
CLASS="glossterm"
>partitions</I
>. Each partition functions as if
it were a separate hard disk. The idea is that if you have one hard
disk, and want to have, say, two operating systems on it, you can
divide the disk into two partitions. Each operating system uses its
partition as it wishes and doesn't touch the other ones. This way
the two operating systems can co-exist peacefully on the same hard
disk. Without partitions one would have to buy a hard disk for each
operating system.</P
><P
>Floppies are not usually partitioned. There is no technical reason
against this, but since they're so small, partitions would be useful
only very rarely. CD-ROMs are usually also not partitioned, since
it's easier to use them as one big disk, and there is seldom a need
to have several operating systems on one.</P
><DIV
CLASS="sect2"
><H2
CLASS="sect2"
><A
NAME="AEN1163"
></A
>6.7.1. The MBR, boot sectors and partition table</H2
><P
>The information about how a hard disk has been partitioned
is stored in its first sector (that is, the first sector of the
first track on the first disk surface). The first sector is the
<I
CLASS="glossterm"
>master boot record</I
> (MBR) of the disk; this is
the sector that the BIOS reads in and starts when the machine is
first booted. The master boot record contains a small program that
reads the partition table, checks which partition is active (that
is, marked bootable), and reads the first sector of that partition,
the partition's <I
CLASS="glossterm"
>boot sector</I
> (the MBR is also
a boot sector, but it has a special status and therefore a special
name). This boot sector contains another small program that reads
the first part of the operating system stored on that partition
(assuming it is bootable), and then starts it.</P
><P
>The partitioning scheme is not built into the hardware, or
even into the BIOS. It is only a convention that many operating
systems follow. Not all operating systems do follow it, but they
are the exceptions. Some operating systems support partitions, but
they occupy one partition on the hard disk, and use their internal
partitioning method within that partition. The latter type exists
peacefully with other operating systems (including Linux), and does
not require any special measures, but an operating system that
doesn't support partitions cannot co-exist on the same disk with any
other operating system.</P
><P
>As a safety precaution, it is a good idea to write down the
partition table on a piece of paper, so that if it ever corrupts you
don't have to lose all your files. (A bad partition table can be
fixed with <B
CLASS="command"
>fdisk</B
>). The relevant information is
given by the <B
CLASS="command"
>fdisk -l</B
> command:
<TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="screen"
> <TT
CLASS="prompt"
>$</TT
> <TT
CLASS="userinput"
><B
>fdisk -l /dev/hda</B
></TT
>
<TT
CLASS="computeroutput"
></TT
>
<TT
CLASS="computeroutput"
>Disk /dev/hda: 15 heads, 57 sectors, 790 cylinders</TT
>
<TT
CLASS="computeroutput"
>Units = cylinders of 855 * 512 bytes</TT
>
<TT
CLASS="computeroutput"
></TT
>
<TT
CLASS="computeroutput"
> Device Boot Begin Start End Blocks Id System</TT
>
<TT
CLASS="computeroutput"
>/dev/hda1 1 1 24 10231+ 82 Linux swap</TT
>
<TT
CLASS="computeroutput"
>/dev/hda2 25 25 48 10260 83 Linux native</TT
>
<TT
CLASS="computeroutput"
>/dev/hda3 49 49 408 153900 83 Linux native</TT
>
<TT
CLASS="computeroutput"
>/dev/hda4 409 409 790 163305 5 Extended</TT
>
<TT
CLASS="computeroutput"
>/dev/hda5 409 409 744 143611+ 83 Linux native</TT
>
<TT
CLASS="computeroutput"
>/dev/hda6 745 745 790 19636+ 83 Linux native</TT
>
<TT
CLASS="prompt"
>$</TT
>
</PRE
></FONT
></TD
></TR
></TABLE
>
</P
></DIV
><DIV
CLASS="sect2"
><H2
CLASS="sect2"
><A
NAME="AEN1187"
></A
>6.7.2. Extended and logical partitions</H2
><P
>The original partitioning scheme for PC hard disks allowed
only four partitions. This quickly turned out to be too little in
real life, partly because some people want more than four operating
systems (Linux, MS-DOS, OS/2, Minix, FreeBSD, NetBSD, or Windows/NT,
to name a few), but primarily because sometimes it is a good idea to
have several partitions for one operating system. For example, swap
space is usually best put in its own partition for Linux instead of
in the main Linux partition for reasons of speed (see below).</P
><P
>To overcome this design problem, <I
CLASS="glossterm"
>extended
partitions</I
> were invented. This trick allows
partitioning a <I
CLASS="glossterm"
>primary partition</I
> into
sub-partitions. The primary partition thus subdivided is the
<I
CLASS="glossterm"
>extended partition</I
>; the sub-partitions are
<I
CLASS="glossterm"
>logical partitions</I
>. They behave like primary
partitions, but are created differently. There is no speed
difference between them.</P
><P
>The partition structure of a hard disk might look like that
in <A
HREF="x1158.html#hard-disk-layout"
>Figure 6-2</A
>. The disk is divided into
three primary partitions, the second of which is divided into two
logical partitions. Part of the disk is not partitioned at all.
The disk as a whole and each primary partition has a boot sector.</P
><DIV
CLASS="figure"
><A
NAME="hard-disk-layout"
></A
><P
><B
>Figure 6-2. A sample hard disk partitioning.</B
></P
><P
><IMG
SRC="hd-layout.png"></P
></DIV
></DIV
><DIV
CLASS="sect2"
><H2
CLASS="sect2"
><A
NAME="AEN1200"
></A
>6.7.3. Partition types</H2
><P
>The partition tables (the one in the MBR, and the ones for
extended partitions) contain one byte per partition that identifies
the type of that partition. This attempts to identify the operating
system that uses the partition, or what it uses it for. The purpose
is to make it possible to avoid having two operating systems
accidentally using the same partition. However, in reality,
operating systems do not really care about the partition type byte;
e.g., Linux doesn't care at all what it is. Worse, some of them use
it incorrectly; e.g., at least some versions of DR-DOS ignore the
most significant bit of the byte, while others don't.</P
><P
>There is no standardization agency to specify what each byte
value means, but some commonly accepted ones are included in in
<A
HREF="x1158.html#partition-ids"
>Table 6-1</A
>. A more complete list is available
in the Linux <B
CLASS="command"
>fdisk</B
> program.</P
><DIV
CLASS="table"
><A
NAME="partition-ids"
></A
><P
><B
>Table 6-1. Partition types (from the Linux <B
CLASS="command"
>fdisk</B
> program).</B
></P
><TABLE
BORDER="1"
CLASS="CALSTABLE"
><TBODY
><TR
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>0</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>Empty</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>40</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>Venix 80286</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>94</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>Amoeba BBT</TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>1</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>DOS 12-bit FAT</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>51</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>Novell?</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>a5</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>BSD/386</TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>2</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>XENIX root</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>52</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>Microport</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>b7</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>BSDI fs</TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>3</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>XENIX usr</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>63</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>GNU HURD</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>b8</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>BSDI swap</TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>4</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>DOS 16-bit FAT <32M</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>64</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>Novell</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>c7</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>Syrinx</TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>5</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>Extended</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>75</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>PC/IX</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>db</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>CP/M</TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>6</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>DOS 16-bit >=32M</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>80</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>Old MINIX</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>e1</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>DOS access</TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>7</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>OS/2 HPFS</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>81</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>Linux/MINIX</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>e3</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>DOS R/O</TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>8</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>AIX</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>82</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>Linux swap</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>f2</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>DOS secondary</TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>9</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>AIX bootable</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>83</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>Linux native</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>ff</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>BBT</TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>a</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>OS/2 Boot Manager</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>93</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>Amoeba</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
> </TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
> </TD
></TR
></TBODY
></TABLE
></DIV
></DIV
><DIV
CLASS="sect2"
><H2
CLASS="sect2"
><A
NAME="AEN1288"
></A
>6.7.4. Partitioning a hard disk</H2
><P
>There are many programs for creating and removing
partitions. Most operating systems have their own, and it can be a
good idea to use each operating system's own, just in case it does
something unusual that the others can't. Many of the programs are
called <B
CLASS="command"
>fdisk</B
>, including the Linux one, or
variations thereof. Details on using the Linux
<B
CLASS="command"
>fdisk</B
> are given on its man page. The
<B
CLASS="command"
>cfdisk</B
> command is similar to
<B
CLASS="command"
>fdisk</B
>, but has a nicer (full screen) user
interface.</P
><P
>When using IDE disks, the boot partition (the partition
with the bootable kernel image files) must be completely within the
first 1024 cylinders. This is because the disk is used via the BIOS
during boot (before the system goes into protected mode), and BIOS
can't handle more than 1024 cylinders. It is sometimes possible to
use a boot partition that is only partly within the first 1024
cylinders. This works as long as all the files that are read with
the BIOS are within the first 1024 cylinders. Since this is
difficult to arrange, it is <EM
>a very bad idea</EM
> to
do it; you never know when a kernel update or disk defragmentation
will result in an unbootable system. Therefore, make sure your boot
partition is completely within the first 1024 cylinders
<A
NAME="AEN1297"
HREF="#FTN.AEN1297"
><SPAN
CLASS="footnote"
>[1]</SPAN
></A
>
.</P
><P
>Some newer versions of the BIOS and IDE disks can, in fact,
handle disks with more than 1024 cylinders. If you have such a
system, you can forget about the problem; if you aren't quite
sure of it, put it within the first 1024 cylinders.</P
><P
>Each partition should have an even number of sectors,
since the Linux filesystems use a 1 kilobyte block size, i.e., two
sectors. An odd number of sectors will result in the last sector
being unused. This won't result in any problems, but it is ugly,
and some versions of <B
CLASS="command"
>fdisk</B
> will warn about it.</P
><P
>Changing a partition's size usually requires first backing up
everything you want to save from that partition (preferably the
whole disk, just in case), deleting the partition, creating new
partition, then restoring everything to the new partition. If the
partition is growing, you may need to adjust the sizes (and backup and
restore) of the adjoining partitions as well.</P
><P
>Since changing partition sizes is painful, it is preferable to
get the partitions right the first time, or have an effective and
easy to use backup system. If you're installing from a media that
does not require much human intervention (say, from CD-ROM, as
opposed to floppies), it is often easy to play with different
configuration at first. Since you don't already have data to back
up, it is not so painful to modify partition sizes several times.</P
><P
>There is a program for MS-DOS, called
<B
CLASS="command"
>fips</B
>
<A
NAME="AEN1306"
HREF="#FTN.AEN1306"
><SPAN
CLASS="footnote"
>[2]</SPAN
></A
>
, which resizes an MS-DOS partition without requiring the backup and
restore, but for other filesystems it is still necessary.</P
></DIV
><DIV
CLASS="sect2"
><H2
CLASS="sect2"
><A
NAME="AEN1314"
></A
>6.7.5. Device files and partitions</H2
><P
>Each partition and extended partition has its own
device file. The naming convention for these files is that a
partition's number is appended after the name of the whole disk,
with the convention that 1-4 are primary partitions (regardless of
how many primary partitions there are) and number greater than 5 are
logical partitions (regardless of within which primary partition
they reside). For example, <TT
CLASS="filename"
>/dev/hda1</TT
> is the
first primary partition on the first IDE hard disk, and
<TT
CLASS="filename"
>/dev/sdb7</TT
> is the third extended partition on
the second SCSI hard disk.</P
></DIV
></DIV
><H3
CLASS="FOOTNOTES"
>Notes</H3
><TABLE
BORDER="0"
CLASS="FOOTNOTES"
WIDTH="100%"
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
WIDTH="5%"
><A
NAME="FTN.AEN1297"
HREF="x1158.html#AEN1297"
><SPAN
CLASS="footnote"
>[1]</SPAN
></A
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
WIDTH="95%"
><P
>This may no longer be true with newer
versions of LILO that support LBA (Logical Block
Addressing). Consult the documentation for your
distribution to see if it has a version of LILO where
LBA is supported.</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
WIDTH="5%"
><A
NAME="FTN.AEN1306"
HREF="x1158.html#AEN1306"
><SPAN
CLASS="footnote"
>[2]</SPAN
></A
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
WIDTH="95%"
><P
>The <B
CLASS="command"
>fips</B
> program is
included in most Linux distributions. The commercial
partition manager <SPAN
CLASS="QUOTE"
>"Partition Magic"</SPAN
> also has a similar
facility but with a nicer interface. Please do remember
that partitioning is dangerous. Make
<EM
>sure</EM
> you have a recent backup of
any important data before you try changing partition
sizes <SPAN
CLASS="QUOTE"
>"on the fly"</SPAN
>. The GNU program
<B
CLASS="command"
>parted</B
> can resize other types of
partitions as well as MS-DOS, but sometimes in a limited
manner. Consult the <B
CLASS="command"
>parted</B
> documentation
before using it, better safe than sorry.
</P
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