1.\" Copyright (c) 1983, 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. Neither the name of the University nor the names of its contributors 13.\" may be used to endorse or promote products derived from this software 14.\" without specific prior written permission. 15.\" 16.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 17.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 20.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26.\" SUCH DAMAGE. 27.\" 28.\" @(#)disktab.5 8.1 (Berkeley) 6/5/93 29.\" $FreeBSD: src/share/man/man5/disktab.5,v 1.4.2.6 2003/05/08 14:57:04 trhodes Exp $ 30.\" $DragonFly: src/share/man/man5/disktab.5,v 1.3 2007/05/18 17:14:14 dillon Exp $ 31.\" 32.Dd June 5, 1993 33.Dt DISKTAB 5 34.Os 35.Sh NAME 36.Nm disktab 37.Nd disk description file 38.Sh SYNOPSIS 39.In disktab.h 40.Sh DESCRIPTION 41.Nm Disktab 42is a simple database which describes disk geometries and 43disk partition characteristics. 44It is used 45.\"by the formatter(\c 46.\"IR.Xr format 8 ) 47.\"to determine how to format the disk, and 48to initialize the disk label on the disk. 49The format is patterned 50after the 51.Xr termcap 5 52terminal data base. Entries in 53.Nm 54consist of a number of `:'-separated fields. The 55first field for each entry gives the names by which a 56disk's entry may be selected, separated by `|' characters. The 57last name given should be a long name fully identifying 58the disk. 59.Pp 60The optional fields for each entry are: 61.Bl -column "indent" "boolx" 62.It Sy "ID Type Description" 63.It "\&ty str Type of disk (e.g. removable, winchester)" 64.It "\&dt str Type of controller (e.g." 65.Tn SMD , ESDI , 66floppy) 67.It "\&ns num Number of sectors per track" 68.It "\&nt num Number of tracks per cylinder" 69.It "\&nc num Total number of cylinders on the disk" 70.It "\&sc num Number of sectors per cylinder, nc*nt default" 71.It "\&su num Number of sectors per unit, sc*nc default" 72.It "\&se num Sector size in bytes," 73.Dv DEV_BSIZE 74default 75.It "\&rm num Rotation speed, rpm, 3600 default" 76.It "\&sk num Sector skew per track, default 0" 77.It "\&cs num Sector skew per cylinder, default 0" 78.It "\&hs num Headswitch time, usec, default 0" 79.It "\&ts num One-cylinder seek time, usec, default 0" 80.It "\&il num Sector interleave (n:1), 1 default" 81.It "\&bs num Boot block size, default" 82.Dv BBSIZE 83.Xr disklabel 8 84.It "\&sb num Superblock size, default" 85.Dv SBSIZE 86.It "\&ba num Block size for partition `a' (bytes)" 87.It "\&bd num Block size for partition `d' (bytes)" 88.It "\&be num Block size for partition `e' (bytes)" 89.It "\&bf num Block size for partition `f' (bytes)" 90.It "\&bg num Block size for partition `g' (bytes)" 91.It "\&bh num Block size for partition `h' (bytes)" 92.It "\&fa num Fragment size for partition `a' (bytes)" 93.It "\&fd num Fragment size for partition `d' (bytes)" 94.It "\&fe num Fragment size for partition `e' (bytes)" 95.It "\&ff num Fragment size for partition `f' (bytes)" 96.It "\&fg num Fragment size for partition `g' (bytes)" 97.It "\&fh num Fragment size for partition `h' (bytes)" 98.It "\&oa num Offset of partition `a' in sectors" 99.It "\&ob num Offset of partition `b' in sectors" 100.It "\&oc num Offset of partition `c' in sectors" 101.It "\&od num Offset of partition `d' in sectors" 102.It "\&oe num Offset of partition `e' in sectors" 103.It "\&of num Offset of partition `f' in sectors" 104.It "\&og num Offset of partition `g' in sectors" 105.It "\&oh num Offset of partition `h' in sectors" 106.It "\&pa num Size of partition `a' in sectors" 107.It "\&pb num Size of partition `b' in sectors" 108.It "\&pc num Size of partition `c' in sectors" 109.It "\&pd num Size of partition `d' in sectors" 110.It "\&pe num Size of partition `e' in sectors" 111.It "\&pf num Size of partition `f' in sectors" 112.It "\&pg num Size of partition `g' in sectors" 113.It "\&ph num Size of partition `h' in sectors" 114.It "\&ta str Partition type of partition `a'" 115.Pf ( Bx 4.2 116filesystem, swap, etc) 117.It "\&tb str Partition type of partition `b'" 118.It "\&tc str Partition type of partition `c'" 119.It "\&td str Partition type of partition `d'" 120.It "\&te str Partition type of partition `e'" 121.It "\&tf str Partition type of partition `f'" 122.It "\&tg str Partition type of partition `g'" 123.It "\&th str Partition type of partition `h'" 124.El 125.Pp 126The following entries have been discontinued and are no longer supported: 127.Bl -column "indent" "boolx" 128.It "\&d[0-4] num Drive-type-dependent parameters" 129.It "\&b[0-1] num Boot block filenames" 130.It "\&sf bool Controller supports bad144-style bad sector forwarding" 131.El 132.Sh FILES 133.Bl -tag -width /etc/disktab -compact 134.It Pa /etc/disktab 135.El 136.Sh SEE ALSO 137.Xr getdiskbyname 3 , 138.Xr disklabel 5 , 139.Xr disklabel 8 , 140.Xr newfs 8 141.Sh HISTORY 142The 143.Nm 144description file appeared in 145.Bx 4.2 . 146