DISKPART(8) | System Manager's Manual | DISKPART(8) |
diskpart
—
diskpart |
[-d ] [-p ]
[-s size]
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 9.4 |