angular speed........................................... 17.5 CD-ROM.................................................. 17.7 compact disk (CD-ROM)................................... 17.7 contiguous allocation................................... 17.6 controller.............................................. 17.4 cylinder................................................ 17.6 cylinder groups......................................... 17.6 database................................................ 17.6 defragment.............................................. 17.6 device driver........................................... 17.4 disk addressing......................................... 17.4 disk drive.............................................. 17.2 diskette................................................ 17.2 drift................................................... 17.3 file.................................................... 17.6 format.................................................. 17.3 free sector list........................................ 17.6 hard disk............................................... 17.2 hard-sectored........................................... 17.3 magnetic media.......................................... 17.2 magnetic tape........................................... 17.1 Manchester encoding..................................... 17.3 microcommand............................................ 17.4 Mylar................................................... 17.2 non-volatile media...................................... 17.1 operating system........................................ 17.4 optical scanner......................................... 17.1 pits.................................................... 17.7 platter................................................. 17.2 pointer (to next sector)................................ 17.6 radially................................................ 17.7 read.................................................... 17.4 read/write head......................................... 17.1 reorganize.............................................. 17.6 rotational delay........................................ 17.5 rotation rate........................................... 17.5 secondary storage....................................... 17.1 sector address.......................................... 17.4 sector.................................................. 17.2 seek delay.............................................. 17.5 soft-sectored........................................... 17.3 stepper motor........................................... 17.2 tape.................................................... 17.1 tracks.................................................. 17.2 volatile storage........................................ 17.7 write................................................... 17.4