NAME    [Toc]    [Back]

     disktab - disk description file

SYNOPSIS    [Toc]    [Back]

     #include <disktab.h>

DESCRIPTION    [Toc]    [Back]

     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:
nc*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).
     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'' (sectors).
     ob        num      Offset of partition ``b'' (sectors).
     oc        num      Offset of partition ``c'' (sectors).
     od        num      Offset of partition ``d'' (sectors).
     oe        num      Offset of partition ``e'' (sectors).
     of        num      Offset of partition ``f'' (sectors).
     og        num      Offset of partition ``g'' (sectors).
     oh        num      Offset of partition ``h'' (sectors).
     pa        num      Size of partition ``a'' (sectors).
     pb        num      Size of partition ``b'' (sectors).
     pc        num      Size of partition ``c'' (sectors).
     pd        num      Size of partition ``d'' (sectors).
     pe        num      Size of partition ``e'' (sectors).
     pf        num      Size of partition ``f'' (sectors).
     pg        num      Size of partition ``g'' (sectors).
     ph        num      Size of partition ``h'' (sectors).
     ta        str      Type of partition  ``a''  (4.2BSD,  swap,
etc.).
     tb        str      Type of partition ``b''.
     tc        str      Type of partition ``c''.
     td        str      Type of partition ``d''.
     te        str      Type of partition ``e''.
     tf        str      Type of partition ``f''.
     tg        str      Type of partition ``g''.
     th        str      Type of partition ``h''.

FILES    [Toc]    [Back]

     /etc/disktab

SEE ALSO    [Toc]    [Back]

     getdiskbyname(3), disklabel(5), disklabel(8), newfs(8)

HISTORY    [Toc]    [Back]

     The disktab description file appeared in 4.2BSD.

OpenBSD      3.6                           June      5,      1993