Man Linux: Main Page and Category List


       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 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   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*




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


       This page is part of release 3.24 of the Linux  man-pages  project.   A
       description  of  the project, and information about reporting bugs, can
       be found at