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28 .\" @(#)disktab.5 8.1 (Berkeley) 6/5/93
36 .Nd disk description file
41 is a simple database which describes disk geometries and
42 disk partition characteristics.
44 .\"by the formatter(\c
46 .\"to determine how to format the disk, and
47 to initialize the disk label on the disk.
48 The format is patterned
54 consist of a number of `:'-separated fields.
56 first field for each entry gives the names by which a
57 disk's entry may be selected, separated by `|' characters.
59 last name given should be a long name fully identifying
62 The optional fields for each entry are:
63 .Bl -column "indent" "boolx"
64 .It Sy "ID Type Description"
65 .It "\&ty str Type of disk (e.g. removable, winchester)"
66 .It "\&dt str Type of controller (e.g."
69 .It "\&ns num Number of sectors per track"
70 .It "\&nt num Number of tracks per cylinder"
71 .It "\&nc num Total number of cylinders on the disk"
72 .It "\&sc num Number of sectors per cylinder, ns*nt default"
73 .It "\&su num Number of sectors per unit, sc*nc default"
74 .It "\&se num Sector size in bytes,"
77 .It "\&sf bool Controller supports bad144-style bad sector forwarding"
78 .It "\&rm num Rotation speed, rpm, 3600 default"
79 .It "\&sk num Sector skew per track, default 0"
80 .It "\&cs num Sector skew per cylinder, default 0"
81 .It "\&hs num Headswitch time, usec, default 0"
82 .It "\&ts num One-cylinder seek time, usec, default 0"
83 .It "\&il num Sector interleave (n:1), 1 default"
84 .It "\&d[0-4] num Drive-type-dependent parameters"
85 .It "\&bs num Boot block size, default"
87 .It "\&sb num Superblock size, default 0"
88 .It "\&ba num Block size for partition `a' (bytes)"
89 .It "\&bd num Block size for partition `d' (bytes)"
90 .It "\&be num Block size for partition `e' (bytes)"
91 .It "\&bf num Block size for partition `f' (bytes)"
92 .It "\&bg num Block size for partition `g' (bytes)"
93 .It "\&bh num Block size for partition `h' (bytes)"
94 .It "\&fa num Fragment size for partition `a' (bytes)"
95 .It "\&fd num Fragment size for partition `d' (bytes)"
96 .It "\&fe num Fragment size for partition `e' (bytes)"
97 .It "\&ff num Fragment size for partition `f' (bytes)"
98 .It "\&fg num Fragment size for partition `g' (bytes)"
99 .It "\&fh num Fragment size for partition `h' (bytes)"
100 .It "\&oa num Offset of partition `a' in sectors"
101 .It "\&ob num Offset of partition `b' in sectors"
102 .It "\&oc num Offset of partition `c' in sectors"
103 .It "\&od num Offset of partition `d' in sectors"
104 .It "\&oe num Offset of partition `e' in sectors"
105 .It "\&of num Offset of partition `f' in sectors"
106 .It "\&og num Offset of partition `g' in sectors"
107 .It "\&oh num Offset of partition `h' in sectors"
108 .It "\&pa num Size of partition `a' in sectors"
109 .It "\&pb num Size of partition `b' in sectors"
110 .It "\&pc num Size of partition `c' in sectors"
111 .It "\&pd num Size of partition `d' in sectors"
112 .It "\&pe num Size of partition `e' in sectors"
113 .It "\&pf num Size of partition `f' in sectors"
114 .It "\&pg num Size of partition `g' in sectors"
115 .It "\&ph num Size of partition `h' in sectors"
116 .It "\&ta str Partition type of partition `a'"
118 file system, swap, etc)
119 .It "\&tb str Partition type of partition `b'"
120 .It "\&tc str Partition type of partition `c'"
121 .It "\&td str Partition type of partition `d'"
122 .It "\&te str Partition type of partition `e'"
123 .It "\&tf str Partition type of partition `f'"
124 .It "\&tg str Partition type of partition `g'"
125 .It "\&th str Partition type of partition `h'"
128 .Bl -tag -width /etc/disktab -compact
132 .Xr getdiskbyname 3 ,
138 description file appeared in