| DISKPART(8) | System Manager's Manual | DISKPART(8) | 
diskpart —
| diskpart | [ -d] [-p]
      [-ssize]
      disk-type | 
diskpart is used to calculate the disk partition sizes
  based on the default rules used at Berkeley.
Available options and operands:
-d-p-s
    size-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 controllers 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
    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
    information.
diskpart command appeared in
  4.2BSD.
When using the -d flag, alternative disk
    names are not included in the output.
| June 6, 1993 | NetBSD 10.1 |