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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 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)

Linux                                                                          2017-09-15                                                                          HD(4)