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 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, nc*nt default |
| su | num | Number of sectors per unit, sc*nc default |
| se | num | Sector size in bytes, DEV_BSIZE default |
| 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 |
| bs | num | Boot block size, default BBSIZE
disklabel(8) |
| 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' 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' (4.2BSD filesystem, 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' |
The following entries have been discontinued and are no longer supported:
| d[0-4] | num | Drive-type-dependent parameters |
| b[0-1] | num | Boot block filenames |
| sf | bool | Controller supports bad144-style bad sector forwarding |
FILES
- /etc/disktab
SEE ALSO
HISTORY
The disktab description file appeared in
4.2BSD.