.\" Copyright (c) 1993 Michael Haardt (michael@moria.de), .\" Fri Apr 2 11:32:09 MET DST 1993 .\" .\" SPDX-License-Identifier: GPL-2.0-or-later .\" .\" Modified Sat Jul 24 16:56:20 1993 by Rik Faith .\" Modified Mon Oct 21 21:38:51 1996 by Eric S. Raymond .\" (and some more by aeb) .\" .TH hd 4 2023-02-05 "Linux man-pages 6.05.01" .SH NAME hd \- MFM/IDE hard disk devices .SH DESCRIPTION The .B 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 .BR hda ; the slave drive is .BR hdb . The master drive of the second controller (major device number 22) is .B hdc and the slave is .BR hdd . .PP General IDE block device names have the form .BI hd X\c , or .BI hd XP\c , where .I X is a letter denoting the physical drive, and .I P is a number denoting the partition on that physical drive. The first form, .BI hd X\c , 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\[en]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 .BI hd X 5\c \&. Both DOS-type partitioning and BSD-disklabel partitioning are supported. You can have at most 63 partitions on an IDE disk. .PP For example, .I /dev/hda refers to all of the first IDE drive in the system; and .I /dev/hdb3 refers to the third DOS "primary" partition on the second one. .PP They are typically created by: .PP .in +4n .EX 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* .EE .in .SH FILES .I /dev/hd* .SH SEE ALSO .BR chown (1), .BR mknod (1), .BR sd (4), .BR mount (8)