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 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 non-empty, non-extended parti
tions 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-diskla
bel 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 `pri
mary' 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
mknod(1), chown(1), mount(8), sd(4)
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