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NAME | DESCRIPTION | FILES | SEE ALSO | COLOPHON |
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hd(4) Kernel Interfaces 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 the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
the project can be found at
⟨https://www.kernel.org/doc/man-pages/⟩. If you have a bug report
for this manual page, see
⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
This page was obtained from the tarball man-pages-6.15.tar.gz
fetched from
⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
2025-08-11. If you discover any rendering problems in this HTML
version of the page, or you believe there is a better or more up-
to-date source for the page, or you have corrections or
improvements to the information in this COLOPHON (which is not
part of the original manual page), send a mail to
man-pages@man7.org
Linux man-pages 6.15 2025-05-17 hd(4)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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