1HD(4)                      Linux Programmer's Manual                     HD(4)
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NAME

6       hd - MFM/IDE hard disk devices
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DESCRIPTION

9       The hd* devices are block devices to access MFM/IDE hard disk drives in
10       raw mode.  The master drive on the primary IDE controller (major device
11       number 3) is hda; the slave drive is hdb.  The master drive of the sec‐
12       ond controller (major device number 22) is hdc and the slave hdd.
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14       General IDE block device names have the form hdX, or hdXP, where X is a
15       letter denoting the physical drive, and P is a number denoting the par‐
16       tition on that physical drive.  The first form, hdX, is used to address
17       the  whole drive.  Partition numbers are assigned in the order the par‐
18       titions are discovered, and only non-empty, non-extended partitions get
19       a  number.  However, partition numbers 1-4 are given to the four parti‐
20       tions described in the MBR (the `primary'  partitions),  regardless  of
21       whether they are unused or extended.  Thus, the first logical partition
22       will be hdX5.  Both DOS-type partitioning and BSD-disklabel  partition‐
23       ing are supported.  You can have at most 63 partitions on an IDE disk.
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25       For  example, /dev/hda refers to all of the first IDE drive in the sys‐
26       tem; and /dev/hdb3 refers to the third DOS `primary' partition  on  the
27       second one.
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29       They are typically created by:
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31              mknod -m 660 /dev/hda b 3 0
32              mknod -m 660 /dev/hda1 b 3 1
33              mknod -m 660 /dev/hda2 b 3 2
34              ...
35              mknod -m 660 /dev/hda8 b 3 8
36              mknod -m 660 /dev/hdb b 3 64
37              mknod -m 660 /dev/hdb1 b 3 65
38              mknod -m 660 /dev/hdb2 b 3 66
39              ...
40              mknod -m 660 /dev/hdb8 b 3 72
41              chown root:disk /dev/hd*
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FILES

44       /dev/hd*
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SEE ALSO

47       chown(1), mknod(1), sd(4), mount(8)
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51Linux                             1992-12-17                             HD(4)
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