NAME

diskpart − calculate default disk partition sizes

SYNOPSIS

diskpart [ −p ] [ −d ] disk-type

DESCRIPTION

Diskpart calculates the disk partition sizes based on the default rules used at Berkeley. 

OPTIONS

−p Produce tables suitable for inclusion in a device driver. 

−d Generate an entry suitable for inclusion in the disk description file /etc/disktab. disktab(5). Space is always left in the last physical partition on the disk for a bad sector forwarding table.  The space reserved for this table occupies 3 tracks.  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.  The ‘c’ partition is, by convention, used to access the entire physical disk, including the space reserved for the bad sector 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, diskpart aborts with the message “disk too small, calculate by hand”. 

 Partition20-60 MB61-205 MB206-355 MB356+ MB
a15884158841588415884
b10032334403344066880
d15884158841588415884
eunused5593655936307200
hunusedunused291346291346
 

If an unknown disk type is specified, diskpart prompts for the required disk geometry information. 

SEE ALSO

disktab(5), bad144(8)

BUGS

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

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

Sun System Release 0.3  —  26 February 1983