projects / unix-history / blame
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1 | .\" Copyright (c) 1983 Regents of the University of California. |
| 2 | .\" All rights reserved. The Berkeley software License Agreement | |
| 3 | .\" specifies the terms and conditions for redistribution. | |
| 4 | .\" | |
| a171a6d5 | 5 | .\" @(#)diskpart.8 6.3 (Berkeley) %G% |
| b9984f54 | 6 | .\" |
| bb053bc6 | 7 | .TH DISKPART 8 "" |
| b9984f54 KM |
8 | .UC 4 |
| 9 | .SH NAME | |
| 10 | diskpart \- calculate default disk partition sizes | |
| 11 | .SH SYNOPSIS | |
| 12 | .B /etc/diskpart | |
| 13 | [ | |
| 14 | .B \-p | |
| 15 | ] [ | |
| 16 | .B \-d | |
| 17 | ] | |
| 18 | disk-type | |
| 19 | .SH DESCRIPTION | |
| 20 | .I Diskpart | |
| 21 | is used to calculate the disk partition sizes based on the | |
| 22 | default rules used at Berkeley. If the | |
| 23 | .B \-p | |
| 24 | option is supplied, tables suitable for inclusion in a device driver | |
| 25 | are produced. If the | |
| 26 | .B \-d | |
| 27 | option is supplied, an entry suitable for inclusion in the disk | |
| 28 | description file | |
| 29 | .I /etc/disktab | |
| 30 | is generated; c.f. | |
| 31 | .IR disktab (5). | |
| a171a6d5 MK |
32 | On disks that use |
| 33 | .IR bad144 \|-style | |
| 34 | bad-sector forwarding, | |
| 35 | space is left in the last partition on the disk | |
| b9984f54 KM |
36 | for a bad sector forwarding table. The space reserved |
| 37 | is one track for the replicated copies of the table and | |
| 38 | sufficient tracks to hold a pool of 126 sectors to which bad sectors | |
| 39 | are mapped. For more information, see | |
| 40 | .IR bad144 (8). | |
| 41 | .PP | |
| 42 | The disk partition sizes are based on the total amount of | |
| a171a6d5 | 43 | space on the disk as given in the table below (all values |
| b9984f54 | 44 | are supplied in units of 512 byte sectors). The `c' partition |
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45 | is, by convention, used to access the entire physical disk. |
| 46 | The device driver tables include | |
| 47 | the space reserved for the bad sector forwarding table in the `c' partition; | |
| 48 | those used in the disktab and default formats exclude reserved tracks. | |
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49 | In normal operation, either the `g' partition is used, or the |
| 50 | `d', `e', and `f' partitions are used. The `g' and `f' partitions | |
| a171a6d5 | 51 | are variable-sized, occupying whatever space remains after allocation |
| b9984f54 KM |
52 | of the fixed sized partitions. |
| 53 | If the disk is smaller than 20 Megabytes, then | |
| 54 | .I diskpart | |
| 55 | aborts with the message ``disk too small, calculate by hand''. | |
| 56 | .in +0.5i | |
| 57 | .nf | |
| 58 | ||
| 59 | .ta \w'Partition 'u +\w'20-60 MB 'u +\w'61-205 MB 'u +\w'206-355 MB 'u +\w'356+ MB'u | |
| 60 | Partition 20-60 MB 61-205 MB 206-355 MB 356+ MB | |
| 61 | a 15884 15884 15884 15884 | |
| 62 | b 10032 33440 33440 66880 | |
| 63 | d 15884 15884 15884 15884 | |
| 64 | e unused 55936 55936 307200 | |
| 65 | h unused unused 291346 291346 | |
| 66 | ||
| 67 | .fi | |
| 68 | .in -0.5i | |
| 69 | .PP | |
| 70 | If an unknown disk type is specified, | |
| 71 | .I diskpart | |
| 72 | will prompt for the required disk geometry information. | |
| 73 | .SH SEE ALSO | |
| 74 | disktab(5), | |
| 75 | bad144(8) | |
| 76 | .SH BUGS | |
| 77 | Certain default partition sizes are based on historical artifacts | |
| 78 | (e.g. RP06), and may result in unsatisfactory layouts. | |
| 79 | .PP | |
| 80 | When using the \-d flag, alternate disk names are not included | |
| 81 | in the output. |