Name
sd — Driver for SCSI Disk Drives
CONFIG
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.
DESCRIPTION
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 re-read of the SCSI disk partition tables.
No parameter is needed.
The scsi(4) ioctl(2) operations
are also supported. If the ioctl(2) parameter is
required, and it is NULL, then ioctl(2) will return
−EINVAL.
FILES
/dev/sd[a−h]: the whole device
/dev/sd[a−h][0−8]: individual block
partitions
sd.4
Copyright 1992 Rickard E. Faith (faith@cs.unc.edu)
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