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Man Pages


Manual Reference Pages  -  DISKTAB (5)

NAME

disktab - disk description file

CONTENTS

Synopsis
Description
Files
See Also
History

SYNOPSIS


.In disklabel.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 field for each entry gives the names by which a disk’s entry may be selected, separated by ‘|’ characters. The last name given should be a long name fully identifying the disk.

The optional fields for each entry are:
ID     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, ns*nt default
su    num     Number of sectors per unit, sc*nc default
se    num     Sector size in bytes,
  DEV_BSIZE default
sf     bool    Controller supports bad144-style bad sector forwarding
rm    num     Rotation speed, rpm, 3600 default
sk    num     Sector skew per track, default 0
cs    num     Sector skew per cylinder, default 0
hs    num     Headswitch time, usec, default 0
ts    num     One-cylinder seek time, usec, default 0
il    num     Sector interleave (n:1), 1 default
d[0-4]        num     Drive-type-dependent parameters
bs    num     Boot block size, default
  BBSIZE
sb     num     Superblock size, default 0
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)
oa    num     Offset of partition ‘a’ in sectors
ob    num     Offset of partition ‘b’ in sectors
oc    num     Offset of partition ‘c’ in sectors
od    num     Offset of partition ‘d’ in sectors
oe    num     Offset of partition ‘e’ in sectors
of    num     Offset of partition ‘f’ in sectors
og    num     Offset of partition ‘g’ in sectors
oh    num     Offset of partition ‘h’ in sectors
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
ta    str     Partition type of partition ‘a’
  ( Bx 4.2 file system, swap, etc)
tb     str     Partition type of partition ‘b’
tc    str     Partition type of partition ‘c’
td    str     Partition type of partition ‘d’
te    str     Partition type of partition ‘e’
tf    str     Partition type of partition ‘f’
tg    str     Partition type of partition ‘g’
th    str     Partition type of partition ‘h’
 

FILES

/etc/disktab
 

SEE ALSO

getdiskbyname(3), bsdlabel(8), newfs(8)

HISTORY

The disktab description file appeared in BSD 4.2 .
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