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BSD 2.11 - man page for diskpart (bsd section 8)

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DISKPART(8)									      DISKPART(8)

       diskpart - calculate default disk partition sizes

       /usr/sbin/diskpart [ -p ] [ -d ] disk-type

       Diskpart  is used to calculate the disk partition sizes based on the default rules used at
       Berkeley.  If the -p option is supplied, tables suitable for inclusion in a device  driver
       are  produced.	If the -d option is supplied, an entry suitable for inclusion in the disk
       description  file  /etc/disktab	is  generated;	c.f.   disktab(5).   On  disks	that  use
       bad144-style  bad-sector forwarding, space is left in the last partition on the disk for a
       bad sector forwarding table.  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 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 512 byte sectors).	The `c' partition
       is, by convention, 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 variable-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

       disktab(5), bad144(8)

       Certain	default  partition  sizes  are based on historical artifacts (e.g. RP06), and may
       result in unsatisfactory layouts.

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

4th Berkeley Distribution		November 17, 1996			      DISKPART(8)
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