I've noticed that every time my card's filesystem karks it, it's straight after I delete something from the card (leaving non-contiguous space) and then write something new to the card (probably resulting in a fragmented file). Can anyone else having problems confirm if that's what happened to them? I've found that dumping the whole card to my hard-drive, making changes, and writing it all back again never produces an error. But it is a long-winded pain in the rump. (Absolutely fantastic card other than that, I'm hoping that switching to FAT32 will stop the errors I'm getting.