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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 $
40 .Nd calculate default disk partition sizes
49 is used to calculate the disk partition sizes based on the
50 default rules used at Berkeley.
52 Available options and operands:
55 Tables suitable for inclusion in a device driver
58 An entry suitable for inclusion in the disk
61 is generated; for example,
64 The size of the disk may be limited to
71 On disks that use bad-sector forwarding,
72 space is normally left in the last partition on the disk
73 for a bad sector forwarding table, although this space
74 is not reflected in the tables produced. The space reserved
75 is one track for the replicated copies of the table and
76 sufficient tracks to hold a pool of 126 sectors to which bad sectors
80 option is intended for other controllers which reserve some space at the end
81 of the disk for bad-sector replacements or other control areas,
82 even if not a multiple of cylinders.
84 The disk partition sizes are based on the total amount of
85 space on the disk as given in the table below (all values
86 are supplied in units of sectors). The
89 is, by convention, used to access the entire physical disk.
90 The device driver tables include
91 the space reserved for the bad sector forwarding table in the
94 those used in the disktab and default formats exclude reserved tracks.
95 In normal operation, either the
97 partition is used, or the
102 partitions are used. The
107 are variable-sized, occupying whatever space remains after allocation
108 of the fixed sized partitions.
109 If the disk is smaller than 20 Megabytes, then
111 aborts 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
114 Partition 20-60 MB 61-205 MB 206-355 MB 356+ MB
115 a 15884 15884 15884 15884
116 b 10032 33440 33440 66880
117 d 15884 15884 15884 15884
118 e unused 55936 55936 307200
119 h unused unused 291346 291346
122 If an unknown disk type is specified,
124 will prompt for the required disk geometry information.
128 Most default partition sizes are based on historical artifacts
129 (like the RP06), and may result in unsatisfactory layouts.
133 flag, alternate disk names are not included