CompactFlash Card Memory

Compact flash is a small, removable storage device used in a variety of electronic applications, including digital cameras, personal digital assistants (PDAs), digital music players, and test equipment.

Non-volatile storage – the compact flash card

It is used more like a hard drive than RAM — it's designed with flash technology, that does not lose its information when the power is turned off. Compact flash cards contain no moving parts and are noiseless, considerably lighter, faster, consume less battery power and are much more rugged than a rotating disk drive.