1.\" $NetBSD: disktab.5,v 1.4 1994/11/30 19:31:15 jtc Exp $ 2.\" 3.\" Copyright (c) 1983, 1991, 1993 4.\" The Regents of the University of California. All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 3. All advertising materials mentioning features or use of this software 15.\" must display the following acknowledgement: 16.\" This product includes software developed by the University of 17.\" California, Berkeley and its contributors. 18.\" 4. Neither the name of the University nor the names of its contributors 19.\" may be used to endorse or promote products derived from this software 20.\" without specific prior written permission. 21.\" 22.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32.\" SUCH DAMAGE. 33.\" 34.\" @(#)disktab.5 8.1 (Berkeley) 6/5/93 35.\" 36.Dd June 5, 1993 37.Dt DISKTAB 5 38.Os BSD 4.2 39.Sh NAME 40.Nm disktab 41.Nd disk description file 42.Sh SYNOPSIS 43.Fd #include <disktab.h> 44.Sh DESCRIPTION 45.Nm 46is a simple database which describes disk geometries and 47disk partition characteristics. 48It is used 49.\"by the formatter(\c 50.\"IR.Xr format 8 ) 51.\"to determine how to format the disk, and 52to initialize the disk label on the disk. 53The format is patterned 54after the 55.Xr termcap 5 56terminal database. Entries in 57.Nm 58consist of a number of colon 59.Pq Sq \&: 60separated fields. The 61first entry for each disk gives the names which are 62known for the disk, separated by 63.Dq \&| 64characters. The 65last name given should be a long name fully identifying 66the disk. 67.Pp 68The following list indicates the normal values 69stored for each disk entry: 70.Bl -column "indent" "boolx" 71.It Sy Name Type Description 72.It "\&ty str Type of disk (e.g., removable, winchester)." 73.It "\&dt str Type of controller (e.g.," 74.Tn SMD , ESDI , 75floppy). 76.It "\&ns num Number of sectors per track." 77.It "\&nt num Number of tracks per cylinder." 78.It "\&nc num Total number of cylinders on the disk." 79.It "\&sc num Number of sectors per cylinder (default: nc*nt)." 80.It "\&su num Number of sectors per unit (default: sc*nc)." 81.It "\&se num Sector size in bytes (default:" 82.Dv DEV_BSIZE ) . 83.It "\&sf bool Controller supports bad144-style bad sector forwarding." 84.It "\&rm num Rotation speed in RPM (default: 3600)." 85.It "\&sk num Sector skew per track (default: 0)." 86.It "\&cs num Sector skew per cylinder (default: 0)." 87.It "\&hs num Headswitch time in usec (default: 0)." 88.It "\&ts num One-cylinder seek time in usec (default: 0)." 89.It "\&il num Sector interleave (n:1) (default: 1)." 90.It "\&d[0-4] num Drive-type-dependent parameters." 91.It "\&bs num Boot block size (default:" 92.Dv BBSIZE ) . 93.It "\&sb num Superblock size (default: " 94.Dv SBSIZE ) . 95.It "\&ba num Block size for partition" 96.Dq a 97(bytes). 98.It "\&bd num Block size for partition" 99.Dq d 100(bytes). 101.It "\&be num Block size for partition" 102.Dq e 103(bytes). 104.It "\&bf num Block size for partition" 105.Dq f 106(bytes). 107.It "\&bg num Block size for partition" 108.Dq g 109(bytes). 110.It "\&bh num Block size for partition" 111.Dq h 112(bytes). 113.It "\&fa num Fragment size for partition" 114.Dq a 115(bytes). 116.It "\&fd num Fragment size for partition" 117.Dq d 118(bytes). 119.It "\&fe num Fragment size for partition" 120.Dq e 121(bytes). 122.It "\&ff num Fragment size for partition" 123.Dq f 124(bytes). 125.It "\&fg num Fragment size for partition" 126.Dq g 127(bytes). 128.It "\&fh num Fragment size for partition" 129.Dq h 130(bytes). 131.It "\&oa num Offset of partition" 132.Dq a 133(sectors). 134.It "\&ob num Offset of partition" 135.Dq b 136(sectors). 137.It "\&oc num Offset of partition" 138.Dq c 139(sectors). 140.It "\&od num Offset of partition" 141.Dq d 142(sectors). 143.It "\&oe num Offset of partition" 144.Dq e 145(sectors). 146.It "\&of num Offset of partition" 147.Dq f 148(sectors). 149.It "\&og num Offset of partition" 150.Dq g 151(sectors). 152.It "\&oh num Offset of partition" 153.Dq h 154(sectors). 155.It "\&pa num Size of partition" 156.Dq a 157(sectors). 158.It "\&pb num Size of partition" 159.Dq b 160(sectors). 161.It "\&pc num Size of partition" 162.Dq c 163(sectors). 164.It "\&pd num Size of partition" 165.Dq d 166(sectors). 167.It "\&pe num Size of partition" 168.Dq e 169(sectors). 170.It "\&pf num Size of partition" 171.Dq f 172(sectors). 173.It "\&pg num Size of partition" 174.Dq g 175(sectors). 176.It "\&ph num Size of partition" 177.Dq h 178(sectors). 179.It "\&ta str Type of partition" 180.Dq a 181(4.2BSD, swap, etc.). 182.It "\&tb str Type of partition" 183.Dq b . 184.It "\&tc str Type of partition" 185.Dq c . 186.It "\&td str Type of partition" 187.Dq d . 188.It "\&te str Type of partition" 189.Dq e . 190.It "\&tf str Type of partition" 191.Dq f . 192.It "\&tg str Type of partition" 193.Dq g . 194.It "\&th str Type of partition" 195.Dq h . 196.El 197.Sh FILES 198.Bl -tag -width /etc/disktab -compact 199.It Pa /etc/disktab 200.El 201.Sh SEE ALSO 202.Xr getdiskbyname 3 , 203.Xr disklabel 5 , 204.Xr disklabel 8 , 205.Xr newfs 8 206.Sh HISTORY 207The 208.Nm 209description file appeared in 210.Bx 4.2 . 211