disktab.5

来自「<B>Digital的Unix操作系统VAX 4.2源码</B>」· 5 代码 · 共 65 行

.\" SCCSID: @(#)disktab.5	8.1	9/11/90
.TH disktab 5
.SH Name
disktab \- disk description file
.SH Syntax
.B #include <disktab.h>
.SH Description
.NXR "disktab file" "format"
The
.PN disktab
file
is a simple data base that describes disk geometries and
disk partition characteristics.  The format is patterned
after the 
.MS termcap 5
terminal data base.  Entries in 
.PN disktab
consist of a number of fields separated by colons (:).  The
first entry for each disk gives the names that are
known for the disk, separated by vertical bars (|).  The
last name given should be a long name fully identifying
the disk. 
.PP
The following list indicates the normal values
stored for each disk entry:
.NXR "disktab file" "field reference list"
.EX 0
Name	Type	Description
ns	num	Number of sectors per track
nt	num	Number of tracks per cylinder
nc	num	Total number of cylinders on the disk
ba	num	Block size for partition `a' (bytes)
bd	num	Block size for partition `d' (bytes)
be	num	Block size for partition `e' (bytes)
bf	num	Block size for partition `f' (bytes)
bg	num	Block size for partition `g' (bytes)
bh	num	Block size for partition `h' (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)
ff	num	Fragment size for partition `f' (bytes)
fg	num	Fragment size for partition `g' (bytes)
fh	num	Fragment size for partition `h' (bytes)
pa	num	Size of partition `a' in sectors
pb	num	Size of partition `b' in sectors
pc	num	Size of partition `c' in sectors
pd	num	Size of partition `d' in sectors
pe	num	Size of partition `e' in sectors
pf	num	Size of partition `f' in sectors
pg	num	Size of partition `g' in sectors
ph	num	Size of partition `h' in sectors
se	num	Sector size in bytes
ty	str	Type of disk (e.g. removable, winchester)
.EE
.PP
The
.PN disktab
entries can be automatically generated with the
.PN diskpart
program.
.SH Files
.PN /etc/disktab
.SH See Also
chpt(8), newfs(8)