DISKTAB

Section: File Formats (5)
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BSD mandoc
BSD 4.2

NAME

disktab - disk description file

SYNOPSIS

Fd #include <disktab.h>

DESCRIPTION

Disktab is a simple database which describes disk geometries and disk partition characteristics. It is used to initialize the disk label on the disk. The format is patterned after the termcap(5) terminal data base. Entries in disktab consist of a number of `:' separated fields. The first entry for each disk gives the names which are known for the disk, separated by `|' characters. The last name given should be a long name fully identifying the disk.

The following list indicates the normal values stored for each disk entry.

Name Type Description
"ty str Type of disk (e.g. removable, winchester)"
"dt strType of controller (e.g.": SMD , ESDI
floppy)
"ns num Number of sectors per track"
"nt num Number of tracks per cylinder"
"ncnumTotal number of cylinders on the disk"
"scnumNumber of sectors per cylinder, nc*nt default"
"sunumNumber of sectors per unit, sc*nc default"
"senumSector size in bytes,": DEV_BSIZE default
"sf bool Controller supports bad144-style bad sector forwarding"
"rm num Rotation speed, rpm, 3600 default"
"sknumSector skew per track, default 0"
"csnumSector skew per cylinder, default 0"
"hsnumHeadswitch time, usec, default 0"
"tsnumOne-cylinder seek time, usec, default 0"
"ilnumSector interleave (n:1), 1 default"
"d[0-4]numDrive-type-dependent parameters"
"bsnumBoot block size, default": BBSIZE
"sbnumSuperblock size, default": SBSIZE
"banumBlock size for partition `a' (bytes)"
"bdnumBlock size for partition `d' (bytes)"
"benumBlock size for partition `e' (bytes)"
"bfnumBlock size for partition `f' (bytes)"
"bgnumBlock size for partition `g' (bytes)"
"bhnumBlock size for partition `h' (bytes)"
"fanumFragment size for partition `a' (bytes)"
"fdnumFragment size for partition `d' (bytes)"
"fenumFragment size for partition `e' (bytes)"
"ffnumFragment size for partition `f' (bytes)"
"fgnumFragment size for partition `g' (bytes)"
"fhnumFragment size for partition `h' (bytes)"
"oanumOffset of partition `a' in sectors"
"obnumOffset of partition `b' in sectors"
"ocnumOffset of partition `c' in sectors"
"odnumOffset of partition `d' in sectors"
"oenumOffset of partition `e' in sectors"
"ofnumOffset of partition `f' in sectors"
"ognumOffset of partition `g' in sectors"
"ohnumOffset of partition `h' in sectors"
"panumSize of partition `a' in sectors"
"pbnumSize of partition `b' in sectors"
"pcnumSize of partition `c' in sectors"
"pdnumSize of partition `d' in sectors"
"penumSize of partition `e' in sectors"
"pfnumSize of partition `f' in sectors"
"pgnumSize of partition `g' in sectors"
"phnumSize of partition `h' in sectors"
"tastrPartition type of partition `a'": ( BSD 4.2 filesystem, swap, etc)
"tb str Partition type of partition `b'"
"tc str Partition type of partition `c'"
"tdstrPartition type of partition `d'"
"testrPartition type of partition `e'"
"tfstrPartition type of partition `f'"
"tgstrPartition type of partition `g'"
"thstrPartition type of partition `h'"

FILES

/etc/disktab

HISTORY

The description file appeared in BSD 4.2

This document was created by man2html, using the manual pages.
Time: 15:33:05 GMT, January 15, 2023