1.\" Copyright (c) 1983, 1991 Regents of the University of California. 2.\" All rights reserved. 3.\" 4.\" %sccs.include.redist.roff% 5.\" 6.\" @(#)disktab.5 6.6 (Berkeley) 05/02/91 7.\" 8.Dd 9.Dt DISKTAB 5 10.Os BSD 4.2 11.Sh NAME 12.Nm disktab 13.Nd disk description file 14.Sh SYNOPSIS 15.Fd #include <disktab.h> 16.Sh DESCRIPTION 17.Nm Disktab 18is a simple database which describes disk geometries and 19disk partition characteristics. 20It is used 21.\"by the formatter(\c 22.\"IR.Xr format 8 ) 23.\"to determine how to format the disk, and 24to initialize the disk label on the disk. 25The format is patterned 26after the 27.Xr termcap 5 28terminal data base. Entries in 29.Nm disktab 30consist of a number of `:' separated fields. The 31first entry for each disk gives the names which are 32known for the disk, separated by `|' characters. The 33last name given should be a long name fully identifying 34the disk. 35.Pp 36The following list indicates the normal values 37stored for each disk entry. 38.Bl -column "indent" "boolx" 39.It Sy Name Type Description 40.It "\&ty str Type of disk (e.g. removable, winchester)" 41.It "\&dt str Type of controller (e.g." 42.Tn SMD , ESDI , 43floppy) 44.It "\&ns num Number of sectors per track" 45.It "\&nt num Number of tracks per cylinder" 46.It "\&nc num Total number of cylinders on the disk" 47.It "\&sc num Number of sectors per cylinder, nc*nt default" 48.It "\&su num Number of sectors per unit, sc*nc default" 49.It "\&se num Sector size in bytes," 50.Dv DEV_BSIZE 51default 52.It "\&sf bool Controller supports bad144-style bad sector forwarding" 53.It "\&rm num Rotation speed, rpm, 3600 default" 54.It "\&sk num Sector skew per track, default 0" 55.It "\&cs num Sector skew per cylinder, default 0" 56.It "\&hs num Headswitch time, usec, default 0" 57.It "\&ts num One-cylinder seek time, usec, default 0" 58.It "\&il num Sector interleave (n:1), 1 default" 59.It "\&d[0-4] num Drive-type-dependent parameters" 60.It "\&bs num Boot block size, default" 61.Dv BBSIZE 62.It "\&sb num Superblock size, default" 63.Dv SBSIZE 64.It "\&ba num Block size for partition `a' (bytes)" 65.It "\&bd num Block size for partition `d' (bytes)" 66.It "\&be num Block size for partition `e' (bytes)" 67.It "\&bf num Block size for partition `f' (bytes)" 68.It "\&bg num Block size for partition `g' (bytes)" 69.It "\&bh num Block size for partition `h' (bytes)" 70.It "\&fa num Fragment size for partition `a' (bytes)" 71.It "\&fd num Fragment size for partition `d' (bytes)" 72.It "\&fe num Fragment size or partition `e' (bytes)" 73.It "\&ff num Fragment size for partition `f' (bytes)" 74.It "\&fg num Fragment size for partition `g' (bytes)" 75.It "\&fh num Fragment size for partition `h' (bytes)" 76.It "\&oa num Offset of partition `a' in sectors" 77.It "\&ob num Offset of partition `b' in sectors" 78.It "\&oc num Offset of partition `c' in sectors" 79.It "\&od num Offset of partition `d' in sectors" 80.It "\&oe num Offset of partition `e' in sectors" 81.It "\&of num Offset of partition `f' in sectors" 82.It "\&og num Offset of partition `g' in sectors" 83.It "\&oh num Offset of partition `h' in sectors" 84.It "\&pa num Size of partition `a' in sectors" 85.It "\&pb num Size of partition `b' in sectors" 86.It "\&pc num Size of partition `c' in sectors" 87.It "\&pd num Size of partition `d' in sectors" 88.It "\&pe num Size of partition `e' in sectors" 89.It "\&pf num Size of partition `f' in sectors" 90.It "\&pg num Size of partition `g' in sectors" 91.It "\&ph num Size of partition `h' in sectors" 92.It "\&ta str Partition type of partition `a'" 93.Pf ( Bx 4.2 94filesystem, swap, etc) 95.It "\&tb str Partition type of partition `b'" 96.It "\&tc str Partition type of partition `c'" 97.It "\&td str Partition type of partition `d'" 98.It "\&te str Partition type of partition `e'" 99.It "\&tf str Partition type of partition `f'" 100.It "\&tg str Partition type of partition `g'" 101.It "\&th str Partition type of partition `h'" 102.El 103.Sh FILES 104.Bl -tag -width /etc/disktab -compact 105.It Pa /etc/disktab 106.El 107.Sh SEE ALSO 108.Xr getdiskbyname 3 , 109.Xr disklabel 5 , 110.Xr disklabel 8 , 111.Xr newfs 8 112.Sh HISTORY 113The 114.Nm 115description file appeared in 116.Bx 4.2 . 117