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. All advertising materials mentioning features or use of this software 13.\" must display the following acknowledgement: 14.\" This product includes software developed by the University of 15.\" California, Berkeley and its contributors. 16.\" 4. Neither the name of the University nor the names of its contributors 17.\" may be used to endorse or promote products derived from this software 18.\" without specific prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" @(#)disktab.5 8.1 (Berkeley) 6/5/93 33.\" $FreeBSD$ 34.\" 35.Dd October 14, 2006 36.Dt DISKTAB 5 37.Os 38.Sh NAME 39.Nm disktab 40.Nd disk description file 41.Sh SYNOPSIS 42.In disklabel.h 43.Sh DESCRIPTION 44.Nm Disktab 45is a simple database which describes disk geometries and 46disk partition characteristics. 47It is used 48.\"by the formatter(\c 49.\"IR.Xr format 8 ) 50.\"to determine how to format the disk, and 51to initialize the disk label on the disk. 52The format is patterned 53after the 54.Xr termcap 5 55terminal data base. 56Entries in 57.Nm 58consist of a number of `:'-separated fields. 59The 60first field for each entry gives the names by which a 61disk's entry may be selected, separated by `|' characters. 62The 63last name given should be a long name fully identifying 64the disk. 65.Pp 66The optional fields for each entry are: 67.Bl -column "indent" "boolx" 68.It Sy "ID Type Description" 69.It "\&ty str Type of disk (e.g. removable, winchester)" 70.It "\&dt str Type of controller (e.g." 71.Tn SMD , ESDI , 72floppy) 73.It "\&ns num Number of sectors per track" 74.It "\&nt num Number of tracks per cylinder" 75.It "\&nc num Total number of cylinders on the disk" 76.It "\&sc num Number of sectors per cylinder, ns*nt default" 77.It "\&su num Number of sectors per unit, sc*nc default" 78.It "\&se num Sector size in bytes," 79.Dv DEV_BSIZE 80default 81.It "\&sf bool Controller supports bad144-style bad sector forwarding" 82.It "\&rm num Rotation speed, rpm, 3600 default" 83.It "\&sk num Sector skew per track, default 0" 84.It "\&cs num Sector skew per cylinder, default 0" 85.It "\&hs num Headswitch time, usec, default 0" 86.It "\&ts num One-cylinder seek time, usec, default 0" 87.It "\&il num Sector interleave (n:1), 1 default" 88.It "\&d[0-4] num Drive-type-dependent parameters" 89.It "\&bs num Boot block size, default" 90.Dv BBSIZE 91.It "\&sb num Superblock size, default 0" 92.It "\&ba num Block size for partition `a' (bytes)" 93.It "\&bd num Block size for partition `d' (bytes)" 94.It "\&be num Block size for partition `e' (bytes)" 95.It "\&bf num Block size for partition `f' (bytes)" 96.It "\&bg num Block size for partition `g' (bytes)" 97.It "\&bh num Block size for partition `h' (bytes)" 98.It "\&fa num Fragment size for partition `a' (bytes)" 99.It "\&fd num Fragment size for partition `d' (bytes)" 100.It "\&fe num Fragment size for partition `e' (bytes)" 101.It "\&ff num Fragment size for partition `f' (bytes)" 102.It "\&fg num Fragment size for partition `g' (bytes)" 103.It "\&fh num Fragment size for partition `h' (bytes)" 104.It "\&oa num Offset of partition `a' in sectors" 105.It "\&ob num Offset of partition `b' in sectors" 106.It "\&oc num Offset of partition `c' in sectors" 107.It "\&od num Offset of partition `d' in sectors" 108.It "\&oe num Offset of partition `e' in sectors" 109.It "\&of num Offset of partition `f' in sectors" 110.It "\&og num Offset of partition `g' in sectors" 111.It "\&oh num Offset of partition `h' in sectors" 112.It "\&pa num Size of partition `a' in sectors" 113.It "\&pb num Size of partition `b' in sectors" 114.It "\&pc num Size of partition `c' in sectors" 115.It "\&pd num Size of partition `d' in sectors" 116.It "\&pe num Size of partition `e' in sectors" 117.It "\&pf num Size of partition `f' in sectors" 118.It "\&pg num Size of partition `g' in sectors" 119.It "\&ph num Size of partition `h' in sectors" 120.It "\&ta str Partition type of partition `a'" 121.Pf ( Bx 4.2 122file system, swap, etc) 123.It "\&tb str Partition type of partition `b'" 124.It "\&tc str Partition type of partition `c'" 125.It "\&td str Partition type of partition `d'" 126.It "\&te str Partition type of partition `e'" 127.It "\&tf str Partition type of partition `f'" 128.It "\&tg str Partition type of partition `g'" 129.It "\&th str Partition type of partition `h'" 130.El 131.Sh FILES 132.Bl -tag -width /etc/disktab -compact 133.It Pa /etc/disktab 134.El 135.Sh SEE ALSO 136.Xr getdiskbyname 3 , 137.\" .Xr bsdlabel 5 , 138.Xr bsdlabel 8 , 139.Xr newfs 8 140.Sh HISTORY 141The 142.Nm 143description file appeared in 144.Bx 4.2 . 145