View Source: sd(4) - Waikato Linux Users Group

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SD
!!!SD
NAME
SYNOPSIS
CONFIG
DESCRIPTION
FILES
----
!!NAME


sd - Driver for SCSI Disk Drives
!!SYNOPSIS


#include
!!CONFIG


The block device name has the following form:
__sd__''lp,'' 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
partitions 5-8 are the DOS


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
__


At this time, only block devices are provided. Raw devices
have not yet been implemented.
!!DESCRIPTION


The following ''ioctl''s 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''s are also supported. If the
ioctl(2) parameter is required, and it is NULL, then
''ioctl''() will return -EINVAL.
!!FILES


/dev/sd[[a-h]: the whole device
/dev/sd[[a-h][[0-8]: individual block partitions
----

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Last edited on Tuesday, June 4, 2002 12:25:04 am by "perry"

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