*nix Documentation Project
·  Home
 +   man pages
·  Linux HOWTOs
·  FreeBSD Tips
·  *niX Forums

  man pages->Linux man pages -> sd (4)              



NAME    [Toc]    [Back]

       sd - Driver for SCSI Disk Drives

SYNOPSIS    [Toc]    [Back]

       #include   <linux/hdreg.h>	   /*	for  HDIO_GETGEO  */  #include
       <linux/fs.h>	      /* for BLKGETSIZE and BLKRRPART */

CONFIG    [Toc]    [Back]

       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 parti-
       tion_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    [Toc]    [Back]

       The following ioctls are provided:

	      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.

	      Returns  the  device  size  in  sectors.	The ioctl(2) parameter
	      should be a pointer to a long.

	      Forces a re-read of the SCSI disk partition tables.  No  parameter
 is needed.

	      The  scsi(4) ioctls are also supported.  If the ioctl(2) parameter
 is required, and it is NULL, then ioctl() will return  -EINVAL.

FILES    [Toc]    [Back]

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

				  1992-12-17				 SD(4)
[ Back ]
 Similar pages
Name OS Title
smfd IRIX driver for SCSI floppy and floptical disk drives
sd OpenBSD SCSI disk driver
sd FreeBSD SCSI disk driver
jag IRIX obsolete VME-SCSI disk driver
dksc IRIX dksc (SCSI) disk driver
vxreattach HP-UX reattach disk drives that have once again become accessible
volreattach Tru64 Reattaches disk drives that have once again become accessible
diskpatch IRIX prevent stiction problems with some disk drives
nsp FreeBSD Workbit Ninja SCSI-3 based PC-Card SCSI host adapter driver
dsk Tru64 SCSI disk interface
Copyright © 2004-2005 DeniX Solutions SRL
newsletter delivery service