man4/hd.4

   1 .\" Copyright (c) 1993 Michael Haardt (michael@moria.de),
   2 .\"     Fri Apr  2 11:32:09 MET DST 1993
   3 .\"
   4 .\" SPDX-License-Identifier: GPL-2.0-or-later
   5 .\"
   6 .\" Modified Sat Jul 24 16:56:20 1993 by Rik Faith <faith@cs.unc.edu>
   7 .\" Modified Mon Oct 21 21:38:51 1996 by Eric S. Raymond <esr@thyrsus.com>
   8 .\" (and some more by aeb)
   9 .\"
  10 .TH HD 4 2017-09-15 "Linux man-pages (unreleased)" "Linux Programmer's Manual"
  11 .SH NAME
  12 hd \- MFM/IDE hard disk devices
  13 .SH DESCRIPTION
  14 The
  15 .B hd*
  16 devices are block devices to access MFM/IDE hard disk drives
  17 in raw mode.
  18 The master drive on the primary IDE controller (major device
  19 number 3) is
  20 .BR hda ;
  21 the slave drive is
  22 .BR hdb .
  23 The master drive of the second controller (major device number 22)
  24 is
  25 .B hdc
  26 and the slave is
  27 .BR hdd .
  28 .PP
  29 General IDE block device names have the form
  30 .BI hd X\c
  31 , or
  32 .BI hd XP\c
  33 , where
  34 .I X
  35 is a letter denoting the physical drive, and
  36 .I P
  37 is a number denoting the partition on that physical drive.
  38 The first form,
  39 .BI hd X\c
  40 , is used to address the whole drive.
  41 Partition numbers are assigned in the order the partitions
  42 are discovered, and only nonempty, nonextended partitions
  43 get a number.
  44 However, partition numbers 1\(en4 are given to the
  45 four partitions described in the MBR (the "primary" partitions),
  46 regardless of whether they are unused or extended.
  47 Thus, the first logical partition will be
  48 .BI hd X 5\c
  49 \&.
  50 Both DOS-type partitioning and BSD-disklabel partitioning are supported.
  51 You can have at most 63 partitions on an IDE disk.
  52 .PP
  53 For example,
  54 .I /dev/hda
  55 refers to all of the first IDE drive in the system; and
  56 .I /dev/hdb3
  57 refers to the third DOS "primary" partition on the second one.
  58 .PP
  59 They are typically created by:
  60 .PP
  61 .in +4n
  62 .EX
  63 mknod \-m 660 /dev/hda b 3 0
  64 mknod \-m 660 /dev/hda1 b 3 1
  65 mknod \-m 660 /dev/hda2 b 3 2
  66 \&...
  67 mknod \-m 660 /dev/hda8 b 3 8
  68 mknod \-m 660 /dev/hdb b 3 64
  69 mknod \-m 660 /dev/hdb1 b 3 65
  70 mknod \-m 660 /dev/hdb2 b 3 66
  71 \&...
  72 mknod \-m 660 /dev/hdb8 b 3 72
  73 chown root:disk /dev/hd*
  74 .EE
  75 .in
  76 .SH FILES
  77 .I /dev/hd*
  78 .SH SEE ALSO
  79 .BR chown (1),
  80 .BR mknod (1),
  81 .BR sd (4),
  82 .BR mount (8)