hd

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 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.	 Partition numbers are assigned in the	order
       the partitions are discovered, and only non-empty, non-extended parti-
       tions 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  parti-
       tions 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
       mknod(1), chown(1), mount(8), sd(4)



Linux				  1992-12-17				HD(4)