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-.\" sd.4
-.\" Copyright 1992 Rickard E. Faith (faith@cs.unc.edu)
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.TH sd 4 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-sd \- driver for SCSI disk drives
-.SH SYNOPSIS
-.nf
-.BR "#include <linux/hdreg.h>        " "/* for HDIO_GETGEO */"
-.BR "#include <linux/fs.h>           " "/* for BLKGETSIZE and BLKRRPART */"
-.fi
-.SH CONFIGURATION
-The block device name has the following form:
-.BI sd lp,
-where
-.I l
-is a letter denoting the physical drive, and
-.I p
-is a number denoting the partition on that physical drive.
-Often, the partition number,
-.IR p ,
-will be left off when the device corresponds to the whole drive.
-.P
-SCSI disks have a major device number of 8, and a minor device number of
-the form (16 *
-.IR drive_number ") + " partition_number ,
-where
-.I drive_number
-is the number of the physical drive in order of detection, and
-.I partition_number
-is as follows:
-.IP \[bu] 3
-partition 0 is the whole drive
-.IP \[bu]
-partitions 1\[en]4 are the DOS "primary" partitions
-.IP \[bu]
-partitions 5\[en]8 are the DOS "extended" (or "logical") partitions
-.P
-For example,
-.I /dev/sda
-will have major 8, minor 0, and will refer to all of the first SCSI drive
-in the system; and
-.I /dev/sdb3
-will have major 8, minor 19, and will refer to the third DOS "primary"
-partition on the second SCSI drive in the system.
-.P
-At this time, only block devices are provided.
-Raw devices have not yet been implemented.
-.SH DESCRIPTION
-The following
-.IR ioctl s
-are provided:
-.TP
-.B HDIO_GETGEO
-Returns the BIOS disk parameters in the following structure:
-.P
-.in +4n
-.EX
-struct hd_geometry {
-    unsigned char  heads;
-    unsigned char  sectors;
-    unsigned short cylinders;
-    unsigned long  start;
-};
-.EE
-.in
-.IP
-A pointer to this structure is passed as the
-.BR ioctl (2)
-parameter.
-.IP
-The information returned in the parameter is the disk geometry of the drive
-.I "as understood by DOS!"
-This geometry is
-.I not
-the physical geometry of the drive.
-It is used when constructing the
-drive's partition table, however, and is needed for convenient operation
-of
-.BR fdisk (1),
-.BR efdisk (1),
-and
-.BR lilo (1).
-If the geometry information is not available, zero will be returned for all
-of the parameters.
-.TP
-.B BLKGETSIZE
-Returns the device size in sectors.
-The
-.BR ioctl (2)
-parameter should be a pointer to a
-.IR long .
-.TP
-.B BLKRRPART
-Forces a reread of the SCSI disk partition tables.
-No parameter is needed.
-.IP
-The SCSI
-.BR ioctl (2)
-operations are also supported.
-If the
-.BR ioctl (2)
-parameter is required, and it is NULL, then
-.BR ioctl (2)
-fails with the error
-.BR EINVAL .
-.SH FILES
-.TP
-.I /dev/sd[a\-h]
-the whole device
-.TP
-.I /dev/sd[a\-h][0\-8]
-individual block partitions
-.\".SH SEE ALSO
-.\".BR scsi (4)