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@(#)disktab.5 8.1 (Berkeley) 6/5/93
.Dd April 5, 2012 .Dt DISKTAB 5 .Os .Sh NAME .Nm disktab .Nd disk description file .Sh SYNOPSIS n disktab.h .Sh DESCRIPTION .Nm is a simple database which describes disk geometries and disk partition characteristics. It is used by the formatter(\c
IR.Xr format 8 )
to determine how to format the disk, and
to initialize the disk label on the disk. The format is described in .Xr capfile 5 . Entries in .Nm consist of a number of `:' 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.
p The following list indicates the normal values stored for each disk entry. l -column "indent" "boolx" t Sy Name Type Description t "ty str Type of disk (e.g. removable, winchester)" t "dt str Type of controller (e.g." .Tn SMD , ESDI , floppy) t "ns num Number of sectors per track" t "nt num Number of tracks per cylinder" t "nc num Total number of cylinders on the disk" t "sc num Number of sectors per cylinder, ns*nt default" t "su num Number of sectors per unit, sc*nc default" t "se num Sector size in bytes," .Dv DEV_BSIZE default t "sf bool Controller supports bad144-style bad sector forwarding" t "rm num Rotation speed, rpm, 3600 default" t "sk num Sector skew per track, default 0" t "cs num Sector skew per cylinder, default 0" t "hs num Headswitch time, usec, default 0" t "ts num One-cylinder seek time, usec, default 0" t "il num Sector interleave (n:1), 1 default" t "d[0-4] num Drive-type-dependent parameters" t "bs num Boot block size, default" .Dv BBSIZE t "sb num Superblock size, default" .Dv SBSIZE t "ba num Block size for partition `a' (bytes)" t "bd num Block size for partition `d' (bytes)" t "be num Block size for partition `e' (bytes)" t "bf num Block size for partition `f' (bytes)" t "bg num Block size for partition `g' (bytes)" t "bh num Block size for partition `h' (bytes)" t "fa num Fragment size for partition `a' (bytes)" t "fd num Fragment size for partition `d' (bytes)" t "fe num Fragment size for partition `e' (bytes)" t "ff num Fragment size for partition `f' (bytes)" t "fg num Fragment size for partition `g' (bytes)" t "fh num Fragment size for partition `h' (bytes)" t "oa num Offset of partition `a' in sectors" t "ob num Offset of partition `b' in sectors" t "oc num Offset of partition `c' in sectors" t "od num Offset of partition `d' in sectors" t "oe num Offset of partition `e' in sectors" t "of num Offset of partition `f' in sectors" t "og num Offset of partition `g' in sectors" t "oh num Offset of partition `h' in sectors" t "pa num Size of partition `a' in sectors" t "pb num Size of partition `b' in sectors" t "pc num Size of partition `c' in sectors" t "pd num Size of partition `d' in sectors" t "pe num Size of partition `e' in sectors" t "pf num Size of partition `f' in sectors" t "pg num Size of partition `g' in sectors" t "ph num Size of partition `h' in sectors" t "ta str Partition type of partition `a'"
f ( Bx 4.2 filesystem, swap, etc) t "tb str Partition type of partition `b'" t "tc str Partition type of partition `c'" t "td str Partition type of partition `d'" t "te str Partition type of partition `e'" t "tf str Partition type of partition `f'" t "tg str Partition type of partition `g'" t "th str Partition type of partition `h'" .El .Sh FILES l -tag -width /etc/disktab -compact t Pa /etc/disktab .El .Sh SEE ALSO .Xr getdiskbyname 3 , .Xr capfile 5 , .Xr disklabel 5 , .Xr disklabel 8 , .Xr newfs 8 .Sh HISTORY The .Nm description file appeared in x 4.2 .
Indexes created Sat Sep 20 22:09:52 GMT 2025