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NetBSD 6.1.5 - man page for diskpart (netbsd section 8)

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DISKPART(8)			   BSD System Manager's Manual			      DISKPART(8)

NAME
     diskpart -- calculate default disk partition sizes

SYNOPSIS
     diskpart [-d] [-p] [-s size] disk-type

DESCRIPTION
     diskpart is used to calculate the disk partition sizes based on the default rules used at
     Berkeley.

     Available options and operands:

     -d 	 An entry suitable for inclusion in the disk description file /etc/disktab is
		 generated; for example, disktab(5).

     -p 	 Tables suitable for inclusion in a device driver are produced.

     -s size	 The size of the disk may be limited to size with the -s option.

     On disks that use bad144(8) type of bad-sector forwarding, space is normally left in the
     last partition on the disk for a bad sector forwarding table, although this space is not
     reflected in the tables produced.	The space reserved is one track for the replicated copies
     of the table and sufficient tracks to hold a pool of 126 sectors to which bad sectors are
     mapped.  For more information, see bad144(8).  The -s option is intended for other con-
     trollers which reserve some space at the end of the disk for bad-sector replacements or
     other control areas, even if not a multiple of cylinders.

     The disk partition sizes are based on the total amount of space on the disk as given in the
     table below (all values are supplied in units of sectors).  The 'c' partition is, by conven-
     tion, used to access the entire physical disk.  The device driver tables include the space
     reserved for the bad sector forwarding table in the 'c' partition; those used in the disktab
     and default formats exclude reserved tracks.  In normal operation, either the 'g' partition
     is used, or the 'd', 'e', and 'f' partitions are used.  The 'g' and 'f' partitions are vari-
     able-sized, occupying whatever space remains after allocation of the fixed sized partitions.
     If the disk is smaller than 20 Megabytes, then diskpart aborts with the message ``disk too
     small, calculate by hand''.

     Partition	 20-60 MB   61-205 MB	206-355 MB   356+ MB
     a		 15884	    15884	15884	     15884
     b		 10032	    33440	33440	     66880
     d		 15884	    15884	15884	     15884
     e		 unused     55936	55936	     307200
     h		 unused     unused	291346	     291346

     If an unknown disk type is specified, diskpart will prompt for the required disk geometry
     information.

SEE ALSO
     disktab(5), bad144(8)

HISTORY
     The diskpart command appeared in 4.2BSD.

BUGS
     Most default partition sizes are based on historical artifacts (like the RP06), and may
     result in unsatisfactory layouts.

     When using the -d flag, alternative disk names are not included in the output.

BSD					   June 6, 1993 				      BSD
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