I bought along with the Canon EOS 400D This card. I initially formatted on the camera at the map. The first photos taken were indeed recorded on the card, but after switching the camera could not be accessed on these photos. By reformatting the problem could not be resolved, either the data were simply off or the camera was "CF Error". With another card, the camera is working properly by the way, that is seems to be a fault of the card to be present.