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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 pri-
       mary 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 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*


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

       This page is part of release 3.22 of the Linux man-pages project.  A description of the project,  and  informa-
       tion about reporting bugs, can be found at

Linux                             1992-12-17                             HD(4)