1.\" Copyright (c) 1983, 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. Neither the name of the University nor the names of its contributors 13.\" may be used to endorse or promote products derived from this software 14.\" without specific prior written permission. 15.\" 16.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 17.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 20.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26.\" SUCH DAMAGE. 27.\" 28.\" from: @(#)diskpart.8 8.1 (Berkeley) 6/6/93 29.\" $NetBSD: diskpart.8,v 1.8 2003/08/07 11:25:18 agc Exp $ 30.\" 31.Dd June 6, 1993 32.Dt DISKPART 8 33.Os 34.Sh NAME 35.Nm diskpart 36.Nd calculate default disk partition sizes 37.Sh SYNOPSIS 38.Nm 39.Op Fl d 40.Op Fl p 41.Op Fl s Ar size 42.Ar disk-type 43.Sh DESCRIPTION 44.Nm 45is used to calculate the disk partition sizes based on the 46default rules used at Berkeley. 47.Pp 48Available options and operands: 49.Bl -tag -width Fl 50.It Fl d 51An entry suitable for inclusion in the disk 52description file 53.Pa /etc/disktab 54is generated; for example, 55.Xr disktab 5 . 56.It Fl p 57Tables suitable for inclusion in a device driver 58are produced. 59.It Fl s Ar size 60The size of the disk may be limited to 61.Ar size 62with the 63.Fl s 64option. 65.El 66.Pp 67On disks that use 68.Xr bad144 8 69type of 70bad-sector forwarding, 71space is normally left in the last partition on the disk 72for a bad sector forwarding table, although this space 73is not reflected in the tables produced. The space reserved 74is one track for the replicated copies of the table and 75sufficient tracks to hold a pool of 126 sectors to which bad sectors 76are mapped. For more information, see 77.Xr bad144 8 . 78The 79.Fl s 80option is intended for other controllers which reserve some space at the end 81of the disk for bad-sector replacements or other control areas, 82even if not a multiple of cylinders. 83.Pp 84The disk partition sizes are based on the total amount of 85space on the disk as given in the table below (all values 86are supplied in units of sectors). The 87.Ql c 88partition 89is, by convention, used to access the entire physical disk. 90The device driver tables include 91the space reserved for the bad sector forwarding table in the 92.Ql c 93partition; 94those used in the disktab and default formats exclude reserved tracks. 95In normal operation, either the 96.Ql g 97partition is used, or the 98.Ql d , 99.Ql e , 100and 101.Ql f 102partitions are used. The 103.Ql g 104and 105.Ql f 106partitions 107are variable-sized, occupying whatever space remains after allocation 108of the fixed sized partitions. 109If the disk is smaller than 20 Megabytes, then 110.Nm 111aborts with the message 112.Dq Li disk too small, calculate by hand . 113.Bl -column Partition 20-60\ MB 61-205\ MB 206-355\ MB 356+\ MB 114Partition 20-60 MB 61-205 MB 206-355 MB 356+ MB 115a 15884 15884 15884 15884 116b 10032 33440 33440 66880 117d 15884 15884 15884 15884 118e unused 55936 55936 307200 119h unused unused 291346 291346 120.El 121.Pp 122If an unknown disk type is specified, 123.Nm 124will prompt for the required disk geometry information. 125.Sh SEE ALSO 126.Xr disktab 5 , 127.Xr bad144 8 128.Sh HISTORY 129The 130.Nm 131command appeared in 132.Bx 4.2 . 133.Sh BUGS 134Most default partition sizes are based on historical artifacts 135(like the RP06), and may result in unsatisfactory layouts. 136.Pp 137When using the 138.Fl d 139flag, alternative disk names are not included 140in the output. 141