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NAME | DESCRIPTION | FILES | SEE ALSO | COLOPHON |
HD(4) Linux Programmer's Manual HD(4)
hd - MFM/IDE hard disk devices
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*
/dev/hd*
chown(1), mknod(1), sd(4), mount(8)
This page is part of release 4.12 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
https://www.kernel.org/doc/man-pages/.
Linux 1992-12-17 HD(4)