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32 .\" @(#)diskpart.8 8.1 (Berkeley) 6/6/93
39 .Nd calculate default disk partition sizes
48 is used to calculate the disk partition sizes based on the
49 default rules used at Berkeley.
51 Available options and operands:
54 Tables suitable for inclusion in a device driver
57 An entry suitable for inclusion in the disk
60 is generated; for example,
63 The size of the disk may be limited to
73 bad-sector forwarding,
74 space is normally left in the last partition on the disk
75 for a bad sector forwarding table, although this space
76 is not reflected in the tables produced. The space reserved
77 is one track for the replicated copies of the table and
78 sufficient tracks to hold a pool of 126 sectors to which bad sectors
79 are mapped. For more information, see
83 option is intended for other controllers which reserve some space at the end
84 of the disk for bad-sector replacements or other control areas,
85 even if not a multiple of cylinders.
87 The disk partition sizes are based on the total amount of
88 space on the disk as given in the table below (all values
89 are supplied in units of sectors). The
92 is, by convention, used to access the entire physical disk.
93 The device driver tables include
94 the space reserved for the bad sector forwarding table in the
97 those used in the disktab and default formats exclude reserved tracks.
98 In normal operation, either the
100 partition is used, or the
105 partitions are used. The
110 are variable-sized, occupying whatever space remains after allocation
111 of the fixed sized partitions.
112 If the disk is smaller than 20 Megabytes, then
114 aborts with the message
115 .Dq Li disk too small, calculate by hand .
116 .Bl -column Partition 20-60\ MB 61-205\ MB 206-355\ MB 356+\ MB
117 Partition 20-60 MB 61-205 MB 206-355 MB 356+ MB
118 a 15884 15884 15884 15884
119 b 10032 33440 33440 66880
120 d 15884 15884 15884 15884
121 e unused 55936 55936 307200
122 h unused unused 291346 291346
125 If an unknown disk type is specified,
127 will prompt for the required disk geometry information.
132 Most default partition sizes are based on historical artifacts
133 (like the RP06), and may result in unsatisfactory layouts.
137 flag, alternate disk names are not included