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32 .\" @(#)diskpart.8 8.1 (Berkeley) 6/6/93
33 .\" $FreeBSD: src/usr.sbin/diskpart/diskpart.8,v 1.5.2.3 2001/08/16 15:55:54 ru Exp $
34 .\" $DragonFly: src/usr.sbin/diskpart/Attic/diskpart.8,v 1.2 2003/06/17 04:29:53 dillon Exp $
41 .Nd calculate default disk partition sizes
50 is used to calculate the disk partition sizes based on the
51 default rules used at Berkeley.
53 Available options and operands:
56 Tables suitable for inclusion in a device driver
59 An entry suitable for inclusion in the disk
62 is generated; for example,
65 The size of the disk may be limited to
72 On disks that use bad-sector forwarding,
73 space is normally left in the last partition on the disk
74 for a bad sector forwarding table, although this space
75 is not reflected in the tables produced. The space reserved
76 is one track for the replicated copies of the table and
77 sufficient tracks to hold a pool of 126 sectors to which bad sectors
81 option is intended for other controllers which reserve some space at the end
82 of the disk for bad-sector replacements or other control areas,
83 even if not a multiple of cylinders.
85 The disk partition sizes are based on the total amount of
86 space on the disk as given in the table below (all values
87 are supplied in units of sectors). The
90 is, by convention, used to access the entire physical disk.
91 The device driver tables include
92 the space reserved for the bad sector forwarding table in the
95 those used in the disktab and default formats exclude reserved tracks.
96 In normal operation, either the
98 partition is used, or the
103 partitions are used. The
108 are variable-sized, occupying whatever space remains after allocation
109 of the fixed sized partitions.
110 If the disk is smaller than 20 Megabytes, then
112 aborts with the message
113 .Dq Li disk too small, calculate by hand .
114 .Bl -column Partition 20-60\ MB 61-205\ MB 206-355\ MB 356+\ MB
115 Partition 20-60 MB 61-205 MB 206-355 MB 356+ MB
116 a 15884 15884 15884 15884
117 b 10032 33440 33440 66880
118 d 15884 15884 15884 15884
119 e unused 55936 55936 307200
120 h unused unused 291346 291346
123 If an unknown disk type is specified,
125 will prompt for the required disk geometry information.
129 Most default partition sizes are based on historical artifacts
130 (like the RP06), and may result in unsatisfactory layouts.
134 flag, alternate disk names are not included