1. (computer science) the usable capacity of a disk drive; the amount of space that is left after the sector headings and boundary definitions and timing information have been added by formatting the disk;
WordNet (r) 3.0 (2006):
formatted capacity
n 1: (computer science) the usable capacity of a disk drive; the
amount of space that is left after the sector headings and
boundary definitions and timing information have been added
by formatting the disk