# 2.11BSD#431 - /usr/man/cat8/diskpart.0

    DISKPART(8)	    UNIX Programmer's Manual	      DISKPART(8)

    NAME
         diskpart - calculate default disk partition sizes

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

    DESCRIPTION
         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 suit-
         able 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 par-
         tition 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' parti-
         tion 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' parti-
         tion 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 information.

    SEE ALSO
         disktab(5), bad144(8)

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

    Printed 11/26/99	November 17, 1996			1

    DISKPART(8)	    UNIX Programmer's Manual	      DISKPART(8)

         layouts.

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

    Printed 11/26/99	November 17, 1996			2

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