hd - MFM/IDE hard disk devices
Hd* 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. Parti-
tion numbers are assigned in the order the partitions are
discovered, and only non-empty, non-extended partitions get
a number. However, partition numbers 1-4 are given to the
four partitions described in the MBR (the `primary' parti-
tions), 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 sup-
ported. 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*
mknod(1), chown(1), mount(8),