disktab man page on DigitalUNIX

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disktab(4)							    disktab(4)

NAME
       disktab - Disk description file

SYNOPSIS
       #include <sys/disklabel.h>

DESCRIPTION
       The disktab database describes disk geometries and disk partition char‐
       acteristics. It is used to initialize the disk label on the  disk.  The
       format  is patterned after the termcap terminal database.  Entries in a
       disktab file 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 | (vertical bar) 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 (for example,  removable,  winches‐
		       ter)
       dt	str    Type  of	 controller  (for  example,  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
       sf	bool   Controller  supports  bad144-style  bad	 sector
			forwarding
       rm	num    Rotation speed, rpm, default 3600
       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), default 1
       d[0-4]	num    Drive-type-dependent parameters
       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' 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 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'
       ─────────────────────────────────────────────────────────────────

EXAMPLES
       The following is an example disktab entry:

       rz25|RZ25|DEC RZ25 Winchester:\
	       :ty=winchester:dt=SCSI:ns#62:nt#9:nc#1492:\
	       :oa#0:pa#131072:ba#8192:fa#1024:\
	       :ob#131072:pb#262144:bb#8192:fb#1024:\
	       :oc#0:pc#832527:bc#8192:fc#1024:\
	       :od#393216:pd#146437:bd#8192:fd#1024:\
	       :oe#539656:pe#146437:be#8192:fe#1024:\
	       :of#686096:pf#146437:bf#8192:ff#1024:\
	       :og#393216:pg#439311:bg#8192:fg#1024:\
	       :oh#0:ph#0:bh#8192:fh#1024:

FILES
       /etc/disktab

SEE ALSO
       Functions: getdiskbyname(3)

       Files: disklabel(4)

       Commands: disklabel(8), newfs(8)

								    disktab(4)
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