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.\" Copyright (c) 1993 Michael Haardt (michael@moria.de), Fri Apr 2 11:32:09 MET DST 1993
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.\"
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.\" This is free documentation; you can redistribute it and/or
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.\" modify it under the terms of the GNU General Public License as
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.\" published by the Free Software Foundation; either version 2 of
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.\" the License, or (at your option) any later version.
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.\"
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.\" The GNU General Public License's references to "object code"
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.\" and "executables" are to be interpreted as the output of any
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.\" document formatting or typesetting system, including
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.\" intermediate and printed output.
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.\"
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.\" This manual is distributed in the hope that it will be useful,
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.\" but WITHOUT ANY WARRANTY; without even the implied warranty of
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.\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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.\" GNU General Public License for more details.
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.\"
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.\" You should have received a copy of the GNU General Public
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.\" License along with this manual; if not, write to the Free
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.\" Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111,
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.\" USA.
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.\"
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.\" Modified Sat Jul 24 16:56:20 1993 by Rik Faith <faith@cs.unc.edu>
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.\" Modified Mon Oct 21 21:38:51 1996 by Eric S. Raymond <esr@thyrsus.com>
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.\" (and some more by aeb)
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.\"
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.TH HD 4 1992-12-17 "Linux" "Linux Programmer's Manual"
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.SH NAME
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hd \- MFM/IDE hard disk devices
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.SH DESCRIPTION
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The \fBhd*\fP devices are block devices to access MFM/IDE hard disk drives
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in raw mode. The master drive on the primary IDE controller (major device
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number 3) is \fBhda\fR; the slave drive is \fBhdb\fR. The master
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drive of the second controller (major device number 22) is \fBhdc\fR
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and the slave \fBhdd\fR.
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.LP
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General IDE block device names have the form
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.BI hd X\c
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, or
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.BI hd XP\c
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, where
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.I X
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is a letter denoting the physical drive, and
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.I P
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is a number denoting the partition on that physical drive.
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The first form,
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.BI hd X,
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is used to address the whole drive.
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Partition numbers are assigned in the order the partitions
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are discovered, and only non-empty, non-extended partitions
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get a number. However, partition numbers 1-4 are given to the
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four partitions described in the MBR (the `primary' partitions),
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regardless of whether they are unused or extended.
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Thus, the first logical partition will be
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.BI hd X 5\c
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\&.
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Both DOS-type partitioning and BSD-disklabel partitioning are supported.
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You can have at most 63 partitions on an IDE disk.
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.LP
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For example,
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.I /dev/hda
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refers to all of the first IDE drive in the system; and
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.I /dev/hdb3
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refers to the third DOS `primary' partition on the second one.
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.LP
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They are typically created by:
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.RS
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.sp
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mknod \-m 660 /dev/hda b 3 0
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.br
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mknod \-m 660 /dev/hda1 b 3 1
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.br
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mknod \-m 660 /dev/hda2 b 3 2
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.br
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\&...
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.br
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mknod \-m 660 /dev/hda8 b 3 8
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.br
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mknod \-m 660 /dev/hdb b 3 64
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.br
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mknod \-m 660 /dev/hdb1 b 3 65
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.br
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mknod \-m 660 /dev/hdb2 b 3 66
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.br
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\&...
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.br
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mknod \-m 660 /dev/hdb8 b 3 72
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.br
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chown root:disk /dev/hd*
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.RE
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.SH FILES
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/dev/hd*
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.SH "SEE ALSO"
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.BR chown (1),
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.BR mknod (1),
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.BR sd (4),
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.BR mount (8)
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