hd - MFM/IDE hard disk devices


     Hd* 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.  Parti-
     tion 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' parti-
     tions), 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  sup-
     ported.  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 `pri-
     mary' 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*




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