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\"     from: @(#)diskpart.8     8.1 (Berkeley) 6/6/93
\"      $NetBSD: diskpart.8,v 1.9 2009/03/15 10:09:29 joerg Exp $
\"
Dd June 6, 1993
Dt DISKPART 8
Os
Sh NAME
Nm diskpart
Nd calculate default disk partition sizes
Sh SYNOPSIS
Nm
Op Fl d
Op Fl p
Op Fl s Ar size
Ar disk-type
Sh DESCRIPTION
Nm
is used to calculate the disk partition sizes based on the
default rules used at Berkeley.
Pp
Available options and operands:
Bl -tag -width Fl
It Fl d
An entry suitable for inclusion in the disk
description file
Pa /etc/disktab
is generated; for example,
Xr disktab 5 .
It Fl p
Tables suitable for inclusion in a device driver
are produced.
It Fl s Ar size
The size of the disk may be limited to
Ar size
with the
Fl s
option.
El
Pp
On disks that use
Xr bad144 8
type of
bad-sector forwarding,
space is normally left in the last partition on the disk
for a bad sector forwarding table, although this space
is not reflected in the tables produced.  The space reserved
is one track for the replicated copies of the table and
sufficient tracks to hold a pool of 126 sectors to which bad sectors
are mapped.  For more information, see
Xr bad144 8 .
The
Fl s
option is intended for other controllers which reserve some space at the end
of the disk for bad-sector replacements or other control areas,
even if not a multiple of cylinders.
Pp
The disk partition sizes are based on the total amount of
space on the disk as given in the table below (all values
are supplied in units of sectors).  The
Ql c
partition
is, by convention, used to access the entire physical disk.
The device driver tables include
the space reserved for the bad sector forwarding table in the
Ql c
partition;
those used in the disktab and default formats exclude reserved tracks.
In normal operation, either the
Ql g
partition is used, or the
Ql d ,
Ql e ,
and
Ql f
partitions are used.  The
Ql g
and
Ql f
partitions
are variable-sized, occupying whatever space remains after allocation
of the fixed sized partitions.
If the disk is smaller than 20 Megabytes, then
Nm
aborts with the message
Dq Li disk too small, calculate by hand .
Bl -column Partition 20-60\ MB 61-205\ MB 206-355\ MB 356+\ MB
It Partition    20-60 MB        61-205 MB       206-355 MB      356+ MB
It a    15884   15884   15884   15884
It b    10032   33440   33440   66880
It d    15884   15884   15884   15884
It e    unused  55936   55936   307200
It h    unused  unused  291346  291346
El
Pp
If an unknown disk type is specified,
Nm
will prompt for the required disk geometry information.
Sh SEE ALSO
Xr disktab 5 ,
Xr bad144 8
Sh HISTORY
The
Nm
command appeared in
Bx 4.2 .
Sh BUGS
Most default partition sizes are based on historical artifacts
(like the RP06), and may result in unsatisfactory layouts.
Pp
When using the
Fl d
flag, alternative disk names are not included
in the output.

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