Hitachi 6GByte Microdrive - macro shot (25% resized)
.. all packaged into the size of a compact flash card.
This one was a dud when I bought a set of refurbished
units off ebay ($4 each!). The seller was good
enough to replace the item under warranty. Very
handy cheap working portable storage for video and photos.
Would still use another media for backup though and in
camera compact flash is far more reliable.