hd - phpMan

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 phys-
       ical 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  parti-
       tion  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*

FILES
       /dev/hd*

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



Linux                             1992-12-17                             HD(4)

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