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28 .\" @(#)disktab.5 8.1 (Berkeley) 6/5/93
29 .\" $FreeBSD: src/share/man/man5/disktab.5,v 1.4.2.6 2003/05/08 14:57:04 trhodes Exp $
30 .\" $DragonFly: src/share/man/man5/disktab.5,v 1.3 2007/05/18 17:14:14 dillon Exp $
37 .Nd disk description file
42 is a simple database which describes disk geometries and
43 disk partition characteristics.
45 .\"by the formatter(\c
47 .\"to determine how to format the disk, and
48 to initialize the disk label on the disk.
49 The format is patterned
52 terminal data base. Entries in
54 consist of a number of `:'-separated fields. The
55 first field for each entry gives the names by which a
56 disk's entry may be selected, separated by `|' characters. The
57 last name given should be a long name fully identifying
60 The optional fields for each entry are:
61 .Bl -column "indent" "boolx"
62 .It Sy "ID Type Description"
63 .It "\&ty str Type of disk (e.g. removable, winchester)"
64 .It "\&dt str Type of controller (e.g."
67 .It "\&ns num Number of sectors per track"
68 .It "\&nt num Number of tracks per cylinder"
69 .It "\&nc num Total number of cylinders on the disk"
70 .It "\&sc num Number of sectors per cylinder, nc*nt default"
71 .It "\&su num Number of sectors per unit, sc*nc default"
72 .It "\&se num Sector size in bytes,"
75 .It "\&rm num Rotation speed, rpm, 3600 default"
76 .It "\&sk num Sector skew per track, default 0"
77 .It "\&cs num Sector skew per cylinder, default 0"
78 .It "\&hs num Headswitch time, usec, default 0"
79 .It "\&ts num One-cylinder seek time, usec, default 0"
80 .It "\&il num Sector interleave (n:1), 1 default"
81 .It "\&bs num Boot block size, default"
84 .It "\&sb num Superblock size, default"
86 .It "\&ba num Block size for partition `a' (bytes)"
87 .It "\&bd num Block size for partition `d' (bytes)"
88 .It "\&be num Block size for partition `e' (bytes)"
89 .It "\&bf num Block size for partition `f' (bytes)"
90 .It "\&bg num Block size for partition `g' (bytes)"
91 .It "\&bh num Block size for partition `h' (bytes)"
92 .It "\&fa num Fragment size for partition `a' (bytes)"
93 .It "\&fd num Fragment size for partition `d' (bytes)"
94 .It "\&fe num Fragment size for partition `e' (bytes)"
95 .It "\&ff num Fragment size for partition `f' (bytes)"
96 .It "\&fg num Fragment size for partition `g' (bytes)"
97 .It "\&fh num Fragment size for partition `h' (bytes)"
98 .It "\&oa num Offset of partition `a' in sectors"
99 .It "\&ob num Offset of partition `b' in sectors"
100 .It "\&oc num Offset of partition `c' in sectors"
101 .It "\&od num Offset of partition `d' in sectors"
102 .It "\&oe num Offset of partition `e' in sectors"
103 .It "\&of num Offset of partition `f' in sectors"
104 .It "\&og num Offset of partition `g' in sectors"
105 .It "\&oh num Offset of partition `h' in sectors"
106 .It "\&pa num Size of partition `a' in sectors"
107 .It "\&pb num Size of partition `b' in sectors"
108 .It "\&pc num Size of partition `c' in sectors"
109 .It "\&pd num Size of partition `d' in sectors"
110 .It "\&pe num Size of partition `e' in sectors"
111 .It "\&pf num Size of partition `f' in sectors"
112 .It "\&pg num Size of partition `g' in sectors"
113 .It "\&ph num Size of partition `h' in sectors"
114 .It "\&ta str Partition type of partition `a'"
116 filesystem, swap, etc)
117 .It "\&tb str Partition type of partition `b'"
118 .It "\&tc str Partition type of partition `c'"
119 .It "\&td str Partition type of partition `d'"
120 .It "\&te str Partition type of partition `e'"
121 .It "\&tf str Partition type of partition `f'"
122 .It "\&tg str Partition type of partition `g'"
123 .It "\&th str Partition type of partition `h'"
126 The following entries have been discontinued and are no longer supported:
127 .Bl -column "indent" "boolx"
128 .It "\&d[0-4] num Drive-type-dependent parameters"
129 .It "\&b[0-1] num Boot block filenames"
130 .It "\&sf bool Controller supports bad144-style bad sector forwarding"
133 .Bl -tag -width /etc/disktab -compact
137 .Xr getdiskbyname 3 ,
144 description file appeared in