DISKTAB(5) OpenBSD Programmer's Manual DISKTAB(5)NAME
disktab - disk description file
SYNOPSIS
#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
database. Entries in disktab consist of a number of colon (`:')
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 str Type of controller (e.g., SMD, ESDI, floppy).
ns num Number of sectors per track.
nt num Number of tracks per cylinder.
nc num Total number of cylinders on the disk.
sc num Number of sectors per cylinder (default: ns*nt).
su num Number of sectors per unit (default: sc*nc).
se num Sector size in bytes (default: DEV_BSIZE).
sf bool Controller supports bad144-style bad sector
forwarding.
rm num Rotation speed in RPM (default: 3600).
sk num Sector skew per track (default: 0).
cs num Sector skew per cylinder (default: 0).
hs num Headswitch time in usec (default: 0).
ts num One-cylinder seek time in usec (default: 0).
il num Sector interleave (n:1) (default: 1).
d[0-4] num Drive-type-dependent parameters.
b0 str Pathname to primary bootstrap.
b1 str Pathname to secondary bootstrap.
bs num Boot block size (default: BBSIZE).
sb num Superblock size (default: SBSIZE).
ba num Block size for partition ``a'' (bytes).
bd num Block size for partition ``d'' (bytes).
be num Block size for partition ``e'' (bytes).
[...]
bp num Block size for partition ``p'' (bytes).
fa num Fragment size for partition ``a'' (bytes).
fd num Fragment size for partition ``d'' (bytes).
fe num Fragment size for partition ``e'' (bytes).
[...]
fp num Fragment size for partition ``p'' (bytes).
oa num Offset of partition ``a'' (sectors).
ob num Offset of partition ``b'' (sectors).
oc num Offset of partition ``c'' (sectors).
[...]
op num Offset of partition ``p'' (sectors).
pa num Size of partition ``a'' (sectors).
pb num Size of partition ``b'' (sectors).
pc num Size of partition ``c'' (sectors).
[...]
pp num Size of partition ``p'' (sectors).
ta str Type of partition ``a'' (4.2BSD, swap, etc.).
tb str Type of partition ``b''.
tc str Type of partition ``c''.
[...]
tp str Type of partition ``p''.
FILES
/etc/disktab
SEE ALSOgetdiskbyname(3), disklabel(5), disklabel(8), newfs(8)HISTORY
The disktab description file appeared in 4.2BSD.
OpenBSD 4.9 May 31, 2007 OpenBSD 4.9