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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 is 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   nonempty,   nonextended
   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*

FILES

   /dev/hd*

SEE ALSO

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

COLOPHON

   This page is part of release 4.09 of the Linux  man-pages  project.   A
   description  of  the project, information about reporting bugs, and the
   latest    version    of    this    page,    can     be     found     at
   https://www.kernel.org/doc/man-pages/.



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