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.Dd October 14, 2006 29.Dt DISKTAB 5 30.Os 31.Sh NAME 32.Nm disktab 33.Nd disk description file 34.Sh SYNOPSIS 35.In disklabel.h 36.Sh DESCRIPTION 37.Nm Disktab 38is a simple database which describes disk geometries and 39disk partition characteristics. 40It is used 41.\"by the formatter(\c 42.\"IR.Xr format 8 ) 43.\"to determine how to format the disk, and 44to initialize the disk label on the disk. 45The format is patterned 46after the 47.Xr termcap 5 48terminal data base. 49Entries in 50.Nm 51consist of a number of `:'-separated fields. 52The 53first field for each entry gives the names by which a 54disk's entry may be selected, separated by `|' characters. 55The 56last name given should be a long name fully identifying 57the disk. 58.Pp 59The optional fields for each entry are: 60.Bl -column "indent" "boolx" 61.It Sy "ID Type Description" 62.It "\&ty str Type of disk (e.g. removable, winchester)" 63.It "\&dt str Type of controller (e.g." 64.Tn SMD , ESDI , 65floppy) 66.It "\&ns num Number of sectors per track" 67.It "\&nt num Number of tracks per cylinder" 68.It "\&nc num Total number of cylinders on the disk" 69.It "\&sc num Number of sectors per cylinder, ns*nt default" 70.It "\&su num Number of sectors per unit, sc*nc default" 71.It "\&se num Sector size in bytes," 72.Dv DEV_BSIZE 73default 74.It "\&sf bool Controller supports bad144-style bad sector forwarding" 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 "\&d[0-4] num Drive-type-dependent parameters" 82.It "\&bs num Boot block size, default" 83.Dv BBSIZE 84.It "\&sb num Superblock size, default 0" 85.It "\&ba num Block size for partition `a' (bytes)" 86.It "\&bd num Block size for partition `d' (bytes)" 87.It "\&be num Block size for partition `e' (bytes)" 88.It "\&bf num Block size for partition `f' (bytes)" 89.It "\&bg num Block size for partition `g' (bytes)" 90.It "\&bh num Block size for partition `h' (bytes)" 91.It "\&fa num Fragment size for partition `a' (bytes)" 92.It "\&fd num Fragment size for partition `d' (bytes)" 93.It "\&fe num Fragment size for partition `e' (bytes)" 94.It "\&ff num Fragment size for partition `f' (bytes)" 95.It "\&fg num Fragment size for partition `g' (bytes)" 96.It "\&fh num Fragment size for partition `h' (bytes)" 97.It "\&oa num Offset of partition `a' in sectors" 98.It "\&ob num Offset of partition `b' in sectors" 99.It "\&oc num Offset of partition `c' in sectors" 100.It "\&od num Offset of partition `d' in sectors" 101.It "\&oe num Offset of partition `e' in sectors" 102.It "\&of num Offset of partition `f' in sectors" 103.It "\&og num Offset of partition `g' in sectors" 104.It "\&oh num Offset of partition `h' in sectors" 105.It "\&pa num Size of partition `a' in sectors" 106.It "\&pb num Size of partition `b' in sectors" 107.It "\&pc num Size of partition `c' in sectors" 108.It "\&pd num Size of partition `d' in sectors" 109.It "\&pe num Size of partition `e' in sectors" 110.It "\&pf num Size of partition `f' in sectors" 111.It "\&pg num Size of partition `g' in sectors" 112.It "\&ph num Size of partition `h' in sectors" 113.It "\&ta str Partition type of partition `a'" 114.Pf ( Bx 4.2 115file system, swap, etc) 116.It "\&tb str Partition type of partition `b'" 117.It "\&tc str Partition type of partition `c'" 118.It "\&td str Partition type of partition `d'" 119.It "\&te str Partition type of partition `e'" 120.It "\&tf str Partition type of partition `f'" 121.It "\&tg str Partition type of partition `g'" 122.It "\&th str Partition type of partition `h'" 123.El 124.Sh FILES 125.Bl -tag -width /etc/disktab -compact 126.It Pa /etc/disktab 127.El 128.Sh SEE ALSO 129.Xr getdiskbyname 3 , 130.Xr bsdlabel 8 , 131.Xr newfs 8 132.Sh HISTORY 133The 134.Nm 135description file appeared in 136.Bx 4.2 . 137