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

       diskpart - calculate default disk partition sizes

       /etc/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).  Space is
       always left in the last partition on the disk for a bad sector forward-
       ing  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 give 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, including the space reserved for the bad sec-
       tor forwarding table.  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 information.

       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

       Does not understand how to handle drives attached to a UDA50.

4th Berkeley Distribution        18 July 1983                      DISKPART(8)