140 lines
4.4 KiB
Groff
140 lines
4.4 KiB
Groff
.\" Copyright (c) 1983, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)diskpart.8 8.1 (Berkeley) 6/6/93
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.\" $FreeBSD$
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.\"
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.Dd June 6, 1993
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.Dt DISKPART 8
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.Os BSD 4
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.Sh NAME
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.Nm diskpart
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.Nd calculate default disk partition sizes
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.Sh SYNOPSIS
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.Nm
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.Op Fl p
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.Op Fl d
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.Op Fl s Ar size
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.Ar disk-type
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.Sh DESCRIPTION
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.Nm Diskpart
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is used to calculate the disk partition sizes based on the
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default rules used at Berkeley.
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.Pp
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Available options and operands:
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.Bl -tag -width Fl
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.It Fl p
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Tables suitable for inclusion in a device driver
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are produced.
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.It Fl d
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An entry suitable for inclusion in the disk
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description file
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.Pa /etc/disktab
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is generated; for example,
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.Xr disktab 5 .
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.It Fl s Ar size
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The size of the disk may be limited to
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.Ar size
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with the
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.Fl s
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option.
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.El
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.Pp
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On disks that use bad-sector forwarding,
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space is normally left in the last partition on the disk
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for a bad sector forwarding table, although this space
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is not reflected in the tables produced. The space reserved
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is one track for the replicated copies of the table and
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sufficient tracks to hold a pool of 126 sectors to which bad sectors
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are mapped.
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The
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.Fl s
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option is intended for other controllers which reserve some space at the end
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of the disk for bad-sector replacements or other control areas,
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even if not a multiple of cylinders.
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.Pp
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The disk partition sizes are based on the total amount of
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space on the disk as given in the table below (all values
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are supplied in units of sectors). The
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.Ql c
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partition
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is, by convention, used to access the entire physical disk.
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The device driver tables include
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the space reserved for the bad sector forwarding table in the
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.Ql c
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partition;
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those used in the disktab and default formats exclude reserved tracks.
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In normal operation, either the
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.Ql g
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partition is used, or the
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.Ql d ,
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.Ql e ,
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and
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.Ql f
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partitions are used. The
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.Ql g
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and
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.Ql f
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partitions
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are variable-sized, occupying whatever space remains after allocation
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of the fixed sized partitions.
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If the disk is smaller than 20 Megabytes, then
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.Nm
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aborts with the message
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.Dq Li disk too small, calculate by hand .
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.Bl -column Partition 20-60\ MB 61-205\ MB 206-355\ MB 356+\ MB
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Partition 20-60 MB 61-205 MB 206-355 MB 356+ MB
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a 15884 15884 15884 15884
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b 10032 33440 33440 66880
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d 15884 15884 15884 15884
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e unused 55936 55936 307200
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h unused unused 291346 291346
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.El
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.Pp
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If an unknown disk type is specified,
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.Nm
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will prompt for the required disk geometry information.
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.Sh SEE ALSO
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.Xr disktab 5 ,
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.Sh BUGS
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Most default partition sizes are based on historical artifacts
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(like the RP06), and may result in unsatisfactory layouts.
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.Pp
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When using the
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.Fl d
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flag, alternate disk names are not included
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in the output.
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.Sh HISTORY
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The
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.Nm
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command appeared in
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.Bx 4.2 .
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