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HD(4) Linux Programmer's Manual HD(4)
NAME
hd - MFM/IDE hard disk devices
DESCRIPTION
The hd* devices are block devices to access MFM/IDE hard disk drives in raw mode. The
master drive on the primary IDE controller (major device number 3) is hda; the slave drive
is hdb. The master drive of the second controller (major device number 22) is hdc and the
slave is hdd.
General IDE block device names have the form hdX, or hdXP, where X is a letter denoting
the physical drive, and P is a number denoting the partition on that physical drive. The
first form, hdX, is used to address the whole drive. Partition numbers are assigned in
the order the partitions are discovered, and only nonempty, nonextended partitions get a
number. However, partition numbers 1-4 are given to the four partitions described in the
MBR (the "primary" partitions), regardless of whether they are unused or extended. Thus,
the first logical partition will be hdX5. Both DOS-type partitioning and BSD-disklabel
partitioning are supported. You can have at most 63 partitions on an IDE disk.
For example, /dev/hda refers to all of the first IDE drive in the system; and /dev/hdb3
refers to the third DOS "primary" partition on the second one.
They are typically created by:
mknod -m 660 /dev/hda b 3 0
mknod -m 660 /dev/hda1 b 3 1
mknod -m 660 /dev/hda2 b 3 2
...
mknod -m 660 /dev/hda8 b 3 8
mknod -m 660 /dev/hdb b 3 64
mknod -m 660 /dev/hdb1 b 3 65
mknod -m 660 /dev/hdb2 b 3 66
...
mknod -m 660 /dev/hdb8 b 3 72
chown root:disk /dev/hd*
FILES
/dev/hd*
SEE ALSO
chown(1), mknod(1), sd(4), mount(8)
COLOPHON
This page is part of release 3.74 of the Linux man-pages project. A description of the
project, information about reporting bugs, and the latest version of this page, can be
found at http://www.kernel.org/doc/man-pages/.
Linux 1992-12-17 HD(4)
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