B.5. Shrinking DOS partitions

A partition is shrunk when sectors are removed from the end of the partition. Because a partition must end on a cylinder boundary, a partition is shrunk by removing cylinder amounts from the end of the segment.

There is one shrink option, as follows:

size

The amount by which you want to reduce the size of the segment. Because a segment ends on a cylinder boundary, this value must be some multiple of the disk's cylinder size.