Instruct: Classify a review as either positive or negative.
Query: Proprietary technology

They don't tell you this very prominently, and they should--you must not modify the contents of an xD card except using the camera itself; otherwise you'll reformat the card, possibly rendering it useless, as the reviewer right beneath me discovered the unpleasant way. So don't ever use it with a card reader. If you're bringing picture files over to your neighborhood developing machine, transfer them onto some other media first.That's what happens when you have to use proprietary technology. Just about everyone else in the world uses SD now, but Olympus and Fuji insist on xD.