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NAME | SYNOPSIS | CONFIGURATION | DESCRIPTION | FILES | COLOPHON |
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sd(4) Kernel Interfaces Manual sd(4)
sd - driver for SCSI disk drives
#include <linux/hdreg.h> /* for HDIO_GETGEO */
#include <linux/fs.h> /* for BLKGETSIZE and BLKRRPART */
The block device name has the following form: sdlp, where l is a
letter denoting the physical drive, and p is a number denoting
the partition on that physical drive. Often, the partition
number, p, will be left off when the device corresponds to the
whole drive.
SCSI disks have a major device number of 8, and a minor device
number of the form (16 * drive_number) + partition_number, where
drive_number is the number of the physical drive in order of
detection, and partition_number is as follows:
• partition 0 is the whole drive
• partitions 1–4 are the DOS "primary" partitions
• partitions 5–8 are the DOS "extended" (or "logical")
partitions
For example, /dev/sda will have major 8, minor 0, and will refer
to all of the first SCSI drive in the system; and /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.
At this time, only block devices are provided. Raw devices have
not yet been implemented.
The following ioctls are provided:
HDIO_GETGEO
Returns the BIOS disk parameters in the following
structure:
struct hd_geometry {
unsigned char heads;
unsigned char sectors;
unsigned short cylinders;
unsigned long start;
};
A pointer to this structure is passed as the ioctl(2)
parameter.
The information returned in the parameter is the disk
geometry of the drive as understood by DOS! This geometry
is 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 fdisk(1),
efdisk(1), and lilo(1). If the geometry information is
not available, zero will be returned for all of the
parameters.
BLKGETSIZE
Returns the device size in sectors. The ioctl(2)
parameter should be a pointer to a long.
BLKRRPART
Forces a reread of the SCSI disk partition tables. No
parameter is needed.
The SCSI ioctl(2) operations are also supported. If the
ioctl(2) parameter is required, and it is NULL, then
ioctl(2) fails with the error EINVAL.
/dev/sd[a-h]
the whole device
/dev/sd[a-h][0-8]
individual block partitions
This page is part of the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
the project can be found at
⟨https://www.kernel.org/doc/man-pages/⟩. If you have a bug report
for this manual page, see
⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
This page was obtained from the tarball man-pages-6.9.1.tar.gz
fetched from
⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
2024-06-26. If you discover any rendering problems in this HTML
version of the page, or you believe there is a better or more up-
to-date source for the page, or you have corrections or
improvements to the information in this COLOPHON (which is not
part of the original manual page), send a mail to
man-pages@man7.org
Linux man-pages 6.9.1 2024-05-02 sd(4)
Pages that refer to this page: ioctl(2), ioctl_console(2), hd(4), hpsa(4), smartpqi(4)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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