A. About the size of a matchbook, CompactFlash is a small, removable storage device used in a variety of electronic devices, including digital cameras, handheld computers, and digital music players. CompactFlash cards are designed with flash technology, a non-volatile storage solution that does not lose its information once power is removed from the card. CompactFlash cards contain no moving parts and are extremely rugged, providing users with much greater protection of their data than conventional magnetic disk drives.