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.\" Copyright (c) 1983, 1991, 1993
.\"	The Regents of the University of California.  All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
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.\"    notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\"    notice, this list of conditions and the following disclaimer in the
.\"    documentation and/or other materials provided with the distribution.
.\" 3. Neither the name of the University nor the names of its contributors
.\"    may be used to endorse or promote products derived from this software
.\"    without specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.\"     @(#)disktab.5	8.1 (Berkeley) 6/5/93
.\" $FreeBSD$
.\"
.Dd October 14, 2006
.Dt DISKTAB 5
.Os
.Sh NAME
.Nm disktab
.Nd disk description file
.Sh SYNOPSIS
.In disklabel.h
.Sh DESCRIPTION
.Nm Disktab
is a simple database which describes disk geometries and
disk partition characteristics.
It is used
.\"by the formatter(\c
.\"IR.Xr format 8 )
.\"to determine how to format the disk, and
to initialize the disk label on the disk.
The format is patterned
after the
.Xr termcap 5
terminal data base.
Entries in
.Nm
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.
.Pp
The optional fields for each entry are:
.Bl -column "indent" "boolx"
.It Sy "ID	Type	Description"
.It "\&ty	str	Type of disk (e.g. removable, winchester)"
.It "\&dt	str	Type of controller (e.g."
.Tn SMD , ESDI ,
floppy)
.It "\&ns	num	Number of sectors per track"
.It "\&nt	num	Number of tracks per cylinder"
.It "\&nc	num	Total number of cylinders on the disk"
.It "\&sc	num	Number of sectors per cylinder, ns*nt default"
.It "\&su	num	Number of sectors per unit, sc*nc default"
.It "\&se	num	Sector size in bytes,"
.Dv DEV_BSIZE
default
.It "\&sf	bool	Controller supports bad144-style bad sector forwarding"
.It "\&rm	num	Rotation speed, rpm, 3600 default"
.It "\&sk	num	Sector skew per track, default 0"
.It "\&cs	num	Sector skew per cylinder, default 0"
.It "\&hs	num	Headswitch time, usec, default 0"
.It "\&ts	num	One-cylinder seek time, usec, default 0"
.It "\&il	num	Sector interleave (n:1), 1 default"
.It "\&d[0-4]	num	Drive-type-dependent parameters"
.It "\&bs	num	Boot block size, default"
.Dv BBSIZE
.It "\&sb	num	Superblock size, default 0"
.It "\&ba	num	Block size for partition `a' (bytes)"
.It "\&bd	num	Block size for partition `d' (bytes)"
.It "\&be	num	Block size for partition `e' (bytes)"
.It "\&bf	num	Block size for partition `f' (bytes)"
.It "\&bg	num	Block size for partition `g' (bytes)"
.It "\&bh	num	Block size for partition `h' (bytes)"
.It "\&fa	num	Fragment size for partition `a' (bytes)"
.It "\&fd	num	Fragment size for partition `d' (bytes)"
.It "\&fe	num	Fragment size for partition `e' (bytes)"
.It "\&ff	num	Fragment size for partition `f' (bytes)"
.It "\&fg	num	Fragment size for partition `g' (bytes)"
.It "\&fh	num	Fragment size for partition `h' (bytes)"
.It "\&oa	num	Offset of partition `a' in sectors"
.It "\&ob	num	Offset of partition `b' in sectors"
.It "\&oc	num	Offset of partition `c' in sectors"
.It "\&od	num	Offset of partition `d' in sectors"
.It "\&oe	num	Offset of partition `e' in sectors"
.It "\&of	num	Offset of partition `f' in sectors"
.It "\&og	num	Offset of partition `g' in sectors"
.It "\&oh	num	Offset of partition `h' in sectors"
.It "\&pa	num	Size of partition `a' in sectors"
.It "\&pb	num	Size of partition `b' in sectors"
.It "\&pc	num	Size of partition `c' in sectors"
.It "\&pd	num	Size of partition `d' in sectors"
.It "\&pe	num	Size of partition `e' in sectors"
.It "\&pf	num	Size of partition `f' in sectors"
.It "\&pg	num	Size of partition `g' in sectors"
.It "\&ph	num	Size of partition `h' in sectors"
.It "\&ta	str	Partition type of partition `a'"
.Pf ( Bx 4.2
file system, swap, etc)
.It "\&tb	str	Partition type of partition `b'"
.It "\&tc	str	Partition type of partition `c'"
.It "\&td	str	Partition type of partition `d'"
.It "\&te	str	Partition type of partition `e'"
.It "\&tf	str	Partition type of partition `f'"
.It "\&tg	str	Partition type of partition `g'"
.It "\&th	str	Partition type of partition `h'"
.El
.Sh FILES
.Bl -tag -width /etc/disktab -compact
.It Pa /etc/disktab
.El
.Sh SEE ALSO
.Xr getdiskbyname 3 ,
.Xr bsdlabel 8 ,
.Xr newfs 8
.Sh HISTORY
The
.Nm
description file appeared in
.Bx 4.2 .
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