1.\" $OpenBSD: disktab.5,v 1.7 2000/10/26 00:37:04 aaron Exp $ 2.\" $NetBSD: disktab.5,v 1.4 1994/11/30 19:31:15 jtc Exp $ 3.\" 4.\" Copyright (c) 1983, 1991, 1993 5.\" The Regents of the University of California. All rights reserved. 6.\" 7.\" Redistribution and use in source and binary forms, with or without 8.\" modification, are permitted provided that the following conditions 9.\" are met: 10.\" 1. Redistributions of source code must retain the above copyright 11.\" notice, this list of conditions and the following disclaimer. 12.\" 2. Redistributions in binary form must reproduce the above copyright 13.\" notice, this list of conditions and the following disclaimer in the 14.\" documentation and/or other materials provided with the distribution. 15.\" 3. All advertising materials mentioning features or use of this software 16.\" must display the following acknowledgement: 17.\" This product includes software developed by the University of 18.\" California, Berkeley and its contributors. 19.\" 4. Neither the name of the University nor the names of its contributors 20.\" may be used to endorse or promote products derived from this software 21.\" without specific prior written permission. 22.\" 23.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33.\" SUCH DAMAGE. 34.\" 35.\" @(#)disktab.5 8.1 (Berkeley) 6/5/93 36.\" 37.Dd June 5, 1993 38.Dt DISKTAB 5 39.Os 40.Sh NAME 41.Nm disktab 42.Nd disk description file 43.Sh SYNOPSIS 44.Fd #include <disktab.h> 45.Sh DESCRIPTION 46.Nm 47is a simple database which describes disk geometries and 48disk partition characteristics. 49It is used 50.\"by the formatter(\c 51.\"IR.Xr format 8 ) 52.\"to determine how to format the disk, and 53to initialize the disk label on the disk. 54The format is patterned after the 55.Xr termcap 5 56terminal database. 57Entries in 58.Nm 59consist of a number of colon 60.Pq Ql \&: 61separated fields. 62The first entry for each disk gives the names which are 63known for the disk, separated by 64.Dq \&| 65characters. 66The last name given should be a long name fully identifying the disk. 67.Pp 68The following list indicates the normal values stored for each disk entry: 69.Bl -column "indent" "boolx" 70.It Sy Name Type Description 71.It "\&ty str Type of disk (e.g., removable, winchester)." 72.It "\&dt str Type of controller (e.g.," 73.Tn SMD , ESDI , 74floppy). 75.It "\&ns num Number of sectors per track." 76.It "\&nt num Number of tracks per cylinder." 77.It "\&nc num Total number of cylinders on the disk." 78.It "\&sc num Number of sectors per cylinder (default: nc*nt)." 79.It "\&su num Number of sectors per unit (default: sc*nc)." 80.It "\&se num Sector size in bytes (default:" 81.Dv DEV_BSIZE ) . 82.It "\&sf bool Controller supports bad144-style bad sector forwarding." 83.It "\&rm num Rotation speed in RPM (default: 3600)." 84.It "\&sk num Sector skew per track (default: 0)." 85.It "\&cs num Sector skew per cylinder (default: 0)." 86.It "\&hs num Headswitch time in usec (default: 0)." 87.It "\&ts num One-cylinder seek time in usec (default: 0)." 88.It "\&il num Sector interleave (n:1) (default: 1)." 89.It "\&d[0-4] num Drive-type-dependent parameters." 90.It "\&bs num Boot block size (default:" 91.Dv BBSIZE ) . 92.It "\&sb num Superblock size (default: " 93.Dv SBSIZE ) . 94.It "\&ba num Block size for partition" 95.Dq a 96(bytes). 97.It "\&bd num Block size for partition" 98.Dq d 99(bytes). 100.It "\&be num Block size for partition" 101.Dq e 102(bytes). 103.It "\&bf num Block size for partition" 104.Dq f 105(bytes). 106.It "\&bg num Block size for partition" 107.Dq g 108(bytes). 109.It "\&bh num Block size for partition" 110.Dq h 111(bytes). 112.It "\&fa num Fragment size for partition" 113.Dq a 114(bytes). 115.It "\&fd num Fragment size for partition" 116.Dq d 117(bytes). 118.It "\&fe num Fragment size for partition" 119.Dq e 120(bytes). 121.It "\&ff num Fragment size for partition" 122.Dq f 123(bytes). 124.It "\&fg num Fragment size for partition" 125.Dq g 126(bytes). 127.It "\&fh num Fragment size for partition" 128.Dq h 129(bytes). 130.It "\&oa num Offset of partition" 131.Dq a 132(sectors). 133.It "\&ob num Offset of partition" 134.Dq b 135(sectors). 136.It "\&oc num Offset of partition" 137.Dq c 138(sectors). 139.It "\&od num Offset of partition" 140.Dq d 141(sectors). 142.It "\&oe num Offset of partition" 143.Dq e 144(sectors). 145.It "\&of num Offset of partition" 146.Dq f 147(sectors). 148.It "\&og num Offset of partition" 149.Dq g 150(sectors). 151.It "\&oh num Offset of partition" 152.Dq h 153(sectors). 154.It "\&pa num Size of partition" 155.Dq a 156(sectors). 157.It "\&pb num Size of partition" 158.Dq b 159(sectors). 160.It "\&pc num Size of partition" 161.Dq c 162(sectors). 163.It "\&pd num Size of partition" 164.Dq d 165(sectors). 166.It "\&pe num Size of partition" 167.Dq e 168(sectors). 169.It "\&pf num Size of partition" 170.Dq f 171(sectors). 172.It "\&pg num Size of partition" 173.Dq g 174(sectors). 175.It "\&ph num Size of partition" 176.Dq h 177(sectors). 178.It "\&ta str Type of partition" 179.Dq a 180(4.2BSD, swap, etc.). 181.It "\&tb str Type of partition" 182.Dq b . 183.It "\&tc str Type of partition" 184.Dq c . 185.It "\&td str Type of partition" 186.Dq d . 187.It "\&te str Type of partition" 188.Dq e . 189.It "\&tf str Type of partition" 190.Dq f . 191.It "\&tg str Type of partition" 192.Dq g . 193.It "\&th str Type of partition" 194.Dq h . 195.El 196.Sh FILES 197.Bl -tag -width /etc/disktab -compact 198.It Pa /etc/disktab 199.El 200.Sh SEE ALSO 201.Xr getdiskbyname 3 , 202.Xr disklabel 5 , 203.Xr disklabel 8 , 204.Xr newfs 8 205.Sh HISTORY 206The 207.Nm 208description file appeared in 209.Bx 4.2 . 210