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DISKTAB(5)		  FreeBSD File Formats Manual		    DISKTAB(5)

NAME
     disktab --	disk description file

SYNOPSIS
     #include <disklabel.h>

DESCRIPTION
     Disktab is	a simple database which	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(5) terminal data
     base.  Entries in disktab consist of a number of `:'-separated fields.
     The first field for each entry gives the names by which a disk's entry
     may be selected, separated	by `|' characters.  The	last name given	should
     be	a long name fully identifying the disk.

     The optional fields for each entry	are:

     ID	       Type	Description
     ty	       str	Type of	disk (e.g. removable, winchester)
     dt	       str	Type of	controller (e.g. SMD, ESDI, floppy)
     ns	       num	Number of sectors per track
     nt	       num	Number of tracks per cylinder
     nc	       num	Total number of	cylinders on the disk
     sc	       num	Number of sectors per cylinder,	nc*nt default
     su	       num	Number of sectors per unit, sc*nc default
     se	       num	Sector size in bytes, DEV_BSIZE	default
     sf	       bool	Controller supports bad144-style bad sector forwarding
     rm	       num	Rotation speed,	rpm, 3600 default
     sk	       num	Sector skew per	track, default 0
     cs	       num	Sector skew per	cylinder, default 0
     hs	       num	Headswitch time, usec, default 0
     ts	       num	One-cylinder seek time,	usec, default 0
     il	       num	Sector interleave (n:1), 1 default
     d[0-4]    num	Drive-type-dependent parameters
     bs	       num	Boot block size, default BBSIZE
     b[0-1]    num	Boot block filenames; see bsdlabel(8)
     sb	       num	Superblock size, default SBSIZE
     ba	       num	Block size for partition `a' (bytes)
     bd	       num	Block size for partition `d' (bytes)
     be	       num	Block size for partition `e' (bytes)
     bf	       num	Block size for partition `f' (bytes)
     bg	       num	Block size for partition `g' (bytes)
     bh	       num	Block size for partition `h' (bytes)
     fa	       num	Fragment size for partition `a'	(bytes)
     fd	       num	Fragment size for partition `d'	(bytes)
     fe	       num	Fragment size for partition `e'	(bytes)
     ff	       num	Fragment size for partition `f'	(bytes)
     fg	       num	Fragment size for partition `g'	(bytes)
     fh	       num	Fragment size for partition `h'	(bytes)
     oa	       num	Offset of partition `a'	in sectors
     ob	       num	Offset of partition `b'	in sectors
     oc	       num	Offset of partition `c'	in sectors
     od	       num	Offset of partition `d'	in sectors
     oe	       num	Offset of partition `e'	in sectors
     of	       num	Offset of partition `f'	in sectors
     og	       num	Offset of partition `g'	in sectors
     oh	       num	Offset of partition `h'	in sectors
     pa	       num	Size of	partition `a' in sectors
     pb	       num	Size of	partition `b' in sectors
     pc	       num	Size of	partition `c' in sectors
     pd	       num	Size of	partition `d' in sectors
     pe	       num	Size of	partition `e' in sectors
     pf	       num	Size of	partition `f' in sectors
     pg	       num	Size of	partition `g' in sectors
     ph	       num	Size of	partition `h' in sectors
     ta	       str	Partition type of partition `a'	(4.2BSD	file system,
			swap, etc)
     tb	       str	Partition type of partition `b'
     tc	       str	Partition type of partition `c'
     td	       str	Partition type of partition `d'
     te	       str	Partition type of partition `e'
     tf	       str	Partition type of partition `f'
     tg	       str	Partition type of partition `g'
     th	       str	Partition type of partition `h'

FILES
     /etc/disktab

SEE ALSO
     getdiskbyname(3), disklabel(5), disklabel(8), newfs(8)

HISTORY
     The disktab description file appeared in 4.2BSD.

FreeBSD	9.2			 June 5, 1993			   FreeBSD 9.2

NAME | SYNOPSIS | DESCRIPTION | FILES | SEE ALSO | HISTORY

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