152 lines
4.4 KiB
Groff
152 lines
4.4 KiB
Groff
.\" $OpenBSD: disktab.5,v 1.23 2022/11/07 10:21:17 krw Exp $
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.\" $NetBSD: disktab.5,v 1.4 1994/11/30 19:31:15 jtc Exp $
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.\"
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.\" 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. 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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.\"
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.Dd $Mdocdate: November 7 2022 $
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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 DESCRIPTION
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.Nm
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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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to initialize the disk label on the disk.
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The format is patterned after the
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.Xr termcap 5
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terminal database.
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Entries in
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.Nm
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consist of a number of colon
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.Pq Ql \&:
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separated fields.
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The first entry for each disk gives the names which are
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known for the disk, separated by
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.Dq \&|
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characters.
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The last name given should be a long name fully identifying the disk.
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.Pp
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The following list indicates the normal values stored for each disk entry:
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.Bl -column "d[0-4]" "bool" "Description"
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.It Sy Name Ta Sy Type Ta Sy Description
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.It \&dt Ta str Ta "Type of controller (e.g., SMD, ESDI, floppy)."
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.It \&ns Ta num Ta "Number of sectors per track."
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.It \&nt Ta num Ta "Number of tracks per cylinder."
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.It \&nc Ta num Ta "Total number of cylinders on the disk."
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.It \&sc Ta num Ta "Number of sectors per cylinder (default: ns*nt)."
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.It \&su Ta num Ta "Number of sectors per unit (default: sc*nc)."
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.It \&se Ta num Ta "Sector size in bytes (default:"
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.Dv DEV_BSIZE ) .
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.Pp
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.It \&ba Ta num Ta "Block size for partition"
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.Dq a
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(bytes).
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.It \&bd Ta num Ta "Block size for partition"
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.Dq d
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(bytes).
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.It \&be Ta num Ta "Block size for partition"
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.Dq e
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(bytes).
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.It [...] Ta "" Ta ""
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.It \&bp Ta num Ta "Block size for partition"
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.Dq p
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(bytes).
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.Pp
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.It \&fa Ta num Ta "Fragment size for partition"
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.Dq a
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(bytes).
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.It \&fd Ta num Ta "Fragment size for partition"
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.Dq d
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(bytes).
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.It \&fe Ta num Ta "Fragment size for partition"
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.Dq e
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(bytes).
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.It [...] Ta "" Ta ""
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.It \&fp Ta num Ta "Fragment size for partition"
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.Dq p
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(bytes).
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.Pp
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.It \&oa Ta num Ta "Offset of partition"
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.Dq a
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(sectors).
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.It \&ob Ta num Ta "Offset of partition"
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.Dq b
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(sectors).
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.It \&oc Ta num Ta "Offset of partition"
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.Dq c
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(sectors).
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.It [...] Ta "" Ta ""
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.It \&op Ta num Ta "Offset of partition"
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.Dq p
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(sectors).
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.Pp
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.It \&pa Ta num Ta "Size of partition"
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.Dq a
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(sectors).
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.It \&pb Ta num Ta "Size of partition"
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.Dq b
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(sectors).
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.It \&pc Ta num Ta "Size of partition"
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.Dq c
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(sectors).
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.It [...] Ta "" Ta ""
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.It \&pp Ta num Ta "Size of partition"
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.Dq p
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(sectors).
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.Pp
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.It \&ta Ta str Ta "Type of partition"
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.Dq a
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(4.2BSD, swap, etc.).
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.It \&tb Ta str Ta "Type of partition"
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.Dq b .
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.It \&tc Ta str Ta "Type of partition"
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.Dq c .
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.It [...] Ta "" Ta ""
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.It \&tp Ta str Ta "Type of partition"
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.Dq p .
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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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