That being said, when I pop the thing into my sd card reader on my windows box, it comes up but is readonly as if there is a lock and it is switched on. I've retaped it in different positions and compared it to a normal sd card and it doesn't look like anything is in the way of the lock position. Does anybody have any ideas? I'd love to be able to throw it in the computer, copy media files over and then swap it back into the 770.