Index for Section 9

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DEVGEOMST(9s)
NAME
  DEVGEOMST - Disk: Stores disk device geometry

SYNOPSIS
       typedef union devgeom {
	struct {
	    unsigned long   dev_size;
	    unsigned short  ntracks;
	    unsigned short  nsectors;
	    unsigned short  ncylinders;
	    unsigned long   attributes;
	    unsigned long   sector_size;
	    unsigned long   min_trans;
	    unsigned long   max_trans;
	    unsigned long   prefer_trans;
	   } geom_info;
	   unsigned char       pad[108];
       } DEVGEOMST;

MEMBERS
  dev_size
      Specifies the total number of sectors/blocks on the device available
      for use.

  ntracks
      Specifies the number of tracks per cylinder. This number may not
      actually reflect the number of tracks per cylinder but is an estimate
      (RAID devices).

  nsectors
      Specifies an average number of sectors per track.

  ncylinders
      Specifies an average number of cylinders per track.

  attributes
      Specifies one of the following device attributes: DEVGEOM_REMOVE (a
      removable device) or DEVGEOM_DYNAMIC (a dynamic geometry device).

  sector_size
      Specifies the number of bytes in the sector.

  min_trans
      Specifies the minimum number of bytes for the transfer size.

  max_trans
      Specifies the maximum number of bytes for the transfer size.

  prefer_trans
      Specifies the preferred number of bytes for the transfer size.







DESCRIPTION
  The DEVGEOMST structure defines the size of tracks, cylinders, and sectors
  on the disk, plus device attributes and the number of bytes that can be
  transferred during a single I/O operation.

  The DEVGETGEOM ioctl command uses this structure  to return geometry
  information to the user data buffer. The device driver's open interface and
  the DEVGDEFPT ioctl command use DEVGEOMST to create a default partition
  map.

FILES
  <io/common/devio.h>

SEE ALSO
  Kernel Interfaces: get_def_partitionmap(9r)

  ioctl Commands: DEVGETGEOM(9r)

Index for Section 9

Alphabetical listing for D

Top of page