freebsd-dev/share/man/man5/disktab.5

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.\" Copyright (c) 1983, 1991, 1993
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.\" may be used to endorse or promote products derived from this software
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.\" @(#)disktab.5 8.1 (Berkeley) 6/5/93
1999-08-28 00:22:10 +00:00
.\" $FreeBSD$
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.\"
.Dd October 14, 2006
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.Dt DISKTAB 5
.Os
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.Sh NAME
.Nm disktab
.Nd disk description file
.Sh SYNOPSIS
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.In disklabel.h
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.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
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last name given should be a long name fully identifying
the disk.
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.Pp
The optional fields for each entry are:
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.Bl -column "indent" "boolx"
.It Sy "ID Type Description"
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.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"
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.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"
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.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)"
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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
file system, swap, etc)
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.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 ,
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.Xr newfs 8
.Sh HISTORY
The
.Nm
description file appeared in
.Bx 4.2 .