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



NAME
       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 sec-
       ond 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 par-
       tition on that physical drive.  The first form, hdX, is used to address
       the  whole drive.  Partition numbers are assigned in the order the par-
       titions are discovered, and only non-empty, non-extended partitions get
       a  number.  However, partition numbers 1-4 are given to the four parti-
       tions 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  partition-
       ing 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 sys-
       tem; 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*

FILES
       /dev/hd*

SEE ALSO
       chown(1), mknod(1), sd(4), mount(8)

COLOPHON
       This  page  is  part of release 3.05 of the Linux man-pages project.  A
       description of the project, and information about reporting  bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.



Linux                             1992-12-17                             HD(4)