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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 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.

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


					    1992-12-17					    SD(4)
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