NetBSD/share/man/man5/disktab.5

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.\" $NetBSD: disktab.5,v 1.4 1994/11/30 19:31:15 jtc Exp $
.\"
.\" Copyright (c) 1983, 1991, 1993
.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" 3. All advertising materials mentioning features or use of this software
.\" must display the following acknowledgement:
.\" This product includes software developed by the University of
.\" California, Berkeley and its contributors.
.\" 4. 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.
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" @(#)disktab.5 8.1 (Berkeley) 6/5/93
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.\"
.Dd June 5, 1993
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.Dt DISKTAB 5
.Os BSD 4.2
.Sh NAME
.Nm disktab
.Nd disk description file
.Sh SYNOPSIS
.Fd #include <disktab.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 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.
.Bl -column "indent" "boolx"
.It Sy Name 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, nc*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"
.Dv SBSIZE
.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)"
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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)"
.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
filesystem, 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 disklabel 5 ,
.Xr disklabel 8 ,
.Xr newfs 8
.Sh HISTORY
The
.Nm
description file appeared in
.Bx 4.2 .