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Linux 2.6 - man page for sd (linux section 4)

SD(4)				    Linux Programmer's 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 phys-
       ical 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:

	      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 con-
	      venient 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 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) will fail 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 release 3.55 of the Linux man-pages project.  A description of the
       project,    and	  information	 about	  reporting    bugs,	can    be    found     at

Linux					    2012-05-03					    SD(4)

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