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.\" Copyright (c) 1983 Regents of the University of California.
.\" All rights reserved.  The Berkeley software License Agreement
.\" specifies the terms and conditions for redistribution.
.\"
.\"	@(#)disktab.5	6.5 (Berkeley) 6/18/87
.\"
.TH DISKTAB 5 "June 18, 1987"
.UC 5
.SH NAME
disktab \- disk description file
.SH SYNOPSIS
.B #include <disktab.h>
.SH DESCRIPTION
.I Disktab
is a simple database which describes disk geometries and
disk partition characteristics.
It is used
.\"by the formatter(\c
.\"IR format (8))
.\"to determine how to format the disk, and
to initialize the disk label on the disk.
The format is patterned
after the
.IR termcap (5)
terminal data base.  Entries in 
.I 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. 
.PP
The following list indicates the normal values
stored for each disk entry.
.nf

.ta \w'd[0-4] 'u +\w'Type  'u
\fBName	Type	Description\fP

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
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 or 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'
.fi
.SH FILES
/etc/disktab
.SH "SEE ALSO"
getdiskbyname(3), disklabel(5), disklabel(8), newfs(8)

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