manual page first distributed with 4.2BSD

SCCS-vsn: usr.sbin/diskpart/diskpart.8 5.1

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+.\" Copyright (c) 1983 Regents of the University of California.
+.\" All rights reserved.  The Berkeley software License Agreement
+.\" specifies the terms and conditions for redistribution.
+.\"
+.\"    @(#)diskpart.8  5.1 (Berkeley) %G%
+.\"
+.TH DISKPART 8 "18 July 1983"
+.UC 4
+.SH NAME
+diskpart \- calculate default disk partition sizes
+.SH SYNOPSIS
+.B /etc/diskpart
+[
+.B \-p
+] [
+.B \-d
+]
+disk-type
+.SH DESCRIPTION
+.I Diskpart
+is used to calculate the disk partition sizes based on the
+default rules used at Berkeley.  If the
+.B \-p
+option is supplied, tables suitable for inclusion in a device driver
+are produced.  If the
+.B \-d
+option is supplied, an entry suitable for inclusion in the disk
+description file
+.I /etc/disktab
+is generated; c.f.
+.IR disktab (5).
+Space is always left in the last partition on the disk
+for a bad sector forwarding table.  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 
+.IR bad144 (8).
+.PP
+The disk partition sizes are based on the total amount of
+space on the disk as give in the table below (all values
+are supplied in units of 512 byte sectors).  The `c' partition
+is, by convention, used to access the entire physical disk, including
+the space reserved for the bad sector forwarding table.
+In normal operation, either the `g' partition is used, or the
+`d', `e', and `f' partitions are used.  The `g' and `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
+.I diskpart
+aborts with the message ``disk too small, calculate by hand''.
+.in +0.5i
+.nf
+
+.ta \w'Partition  'u +\w'20-60 MB  'u +\w'61-205 MB  'u +\w'206-355 MB  'u +\w'356+ MB'u
+Partition      20-60 MB        61-205 MB       206-355 MB      356+ MB
+a      15884   15884   15884   15884
+b      10032   33440   33440   66880
+d      15884   15884   15884   15884
+e      unused  55936   55936   307200
+h      unused  unused  291346  291346
+
+.fi
+.in -0.5i
+.PP
+If an unknown disk type is specified, 
+.I diskpart
+will prompt for the required disk geometry information.
+.SH SEE ALSO
+disktab(5),
+bad144(8)
+.SH BUGS
+Certain default partition sizes are based on historical artifacts
+(e.g. RP06), and may result in unsatisfactory layouts.
+.PP
+When using the \-d flag, alternate disk names are not included
+in the output.
+.PP
+Does not understand how to handle drives attached to a UDA50.