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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, ns*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
     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 5.4			 June 5, 1993			   FreeBSD 5.4

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