64 gig DOES NOT WORK! 32 is the max. I also tried some of my ultra and extreme cards in the FC200 and the extreme card does not produce any faster writes than the utlra's. I think the camera buffer is the limiting factor and bottle neck. I tossed the included 4GB card in my spare pile when I got the P2V. Anything rated +/-30/gbs will max the camera buffer and using something rated higher will not result in faster writes for RAW files.