disktab(4)						     Kernel Interfaces Manual							disktab(4)

NAME

       disktab - Disk description file

SYNOPSIS

       #include <sys/disklabel.h>

DESCRIPTION

       The  disktab  database  describes disk geometries and disk partition characteristics.  It is used to initialize the disk label on the disk.
       The format is patterned after the termcap terminal database.  Entries in a disktab file consist of a number of : (colon) separated  fields.
       The  first entry for each disk gives the names which are known for the disk, separated by | (vertical bar) characters.  The last name given
       should be a long name fully identifying the disk.

       The following list indicates the normal values stored for each disk entry: Type Description str	Type of disk (for example, removable, win-
       chester)  str  Type of controller (for example, SMD, ESDI,      floppy) num  Number of sectors per track num  Number of tracks per cylinder
       num  Total number of cylinders on the disk num  Number of sectors per cylinder, nc*nt  default  num  Number  of	sectors  per  unit,  sc*nc
       default	num  Sector size in bytes, DEV_BSIZE default bool Controller supports bad144-style bad sector	   forwarding num  Rotation speed,
       rpm, default 3600 num  Sector skew per track, default 0 num  Sector skew per cylinder, default 0  num  Headswitch  time,  usec,	default  0
       num  One-cylinder  seek	time, usec, default 0 num  Sector interleave (n:1), default 1 num  Drive-type-dependent parameters num	Boot block
       size, default BBSIZE num  Superblock size, default SBSIZE num  Block size for partition `a'  (bytes)  num  Block  size  for  partition  `d'
       (bytes)	num  Block  size  for  partition  `e'  (bytes) num  Block size for partition `f' (bytes) num  Block size for partition `g' (bytes)
       num  Block size for partition `h' (bytes) num  Fragment size for partition  `a'	(bytes)  num  Fragment	size  for  partition  `d'  (bytes)
       num  Fragment  size  for  partition  `e'  (bytes) num  Fragment size for partition `f' (bytes) num  Fragment size for partition `g' (bytes)
       num  Fragment size for partition `h' (bytes) num  Offset of partition `a' in sectors num  Offset of partition `b' in sectors num  Offset of
       partition  `c'  in  sectors num	Offset of partition `d' in sectors num	Offset of partition `e' in sectors num	Offset of partition `f' in
       sectors num  Offset of partition `g' in sectors num  Offset of partition `h' in sectors num  Size of partition `a' in sectors num  Size	of
       partition  `b' in sectors num  Size of partition `c' in sectors num  Size of partition `d' in sectors num  Size of partition `e' in sectors
       num  Size of partition `f' in sectors num  Size of partition `g' in sectors num	Size of partition `h' in sectors  str  Partition  type	of
       partition  `a' (4.2BSD file system,	swap, etc.)  str  Partition type of partition `b' str  Partition type of partition `c' str  Parti-
       tion type of partition `d' str  Partition type of partition `e' str  Partition type of partition `f' str  Partition type of  partition  `g'
       str  Partition type of partition `h'

EXAMPLES

       The following is an example disktab entry:

       rz25|RZ25|DEC RZ25 Winchester:
	       :ty=winchester:dt=SCSI:ns#62:nt#9:nc#1492:
	       :oa#0:pa#131072:ba#8192:fa#1024:
	       :ob#131072:pb#262144:bb#8192:fb#1024:
	       :oc#0:pc#832527:bc#8192:fc#1024:
	       :od#393216:pd#146437:bd#8192:fd#1024:
	       :oe#539656:pe#146437:be#8192:fe#1024:
	       :of#686096:pf#146437:bf#8192:ff#1024:
	       :og#393216:pg#439311:bg#8192:fg#1024:
	       :oh#0:ph#0:bh#8192:fh#1024:

FILES

       /etc/disktab

RELATED INFORMATION

       Functions: getdiskbyname(3)

       Files: disklabel(4)

       Commands: disklabel(8), newfs(8) delim off

																	disktab(4)