DISKTAB(5)						      BSD File Formats Manual							DISKTAB(5)

NAME

     disktab -- disk description file

SYNOPSIS

     #include <disktab.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 entry for each disk gives the names which are known for the disk, separated by `|' 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.

     Name      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
     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 filesystem, 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.

BSD
								   June 5, 1993 							       BSD