Yo what's up. I've just recently started tracking with a MR-8, and I know what your problem is, although you probably have researched it enough to figure it out by now. There are only certain brands of CF cards which the MR-8 will recognize. If you have the red MR-8, go to the Fostex website, and download the software upgrade which installs via USB I believe. This fixes a memory error and also compatibility issues with many CF cards. If that doesn't work, return the card and get a compatible one, or sell the whole shabang and get the new 40gb HD version when it comes out. I personally like importing mixes track by track to my computer with a card reader though.