I always use UDMA flash cards. They are compatible with all camerasthat use CF.





They do not save files faster on a 40D, but really downlooad to my PS faster using a UDMA firewire reader. I haveboth lexar and a sandisk firewire 800 readers, they are equally fast. I did have to purchase firewire 800 cards for my pc's.


Newer cameras are UDMA enabled, so images write faster as well.