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