I have mine configured to use the CF card first, using the SD card as an overflow. Just prefer CD cards, which seem to be somewhat faster, even though for some reason most computers nowadays don't have an integrated CF card slot (my old Packard Bell, DOB 2006, sadly deceased 2010, did have a CF slot (it had a multi-card reader)).
D4, D800, D300
It ain't so much the things we don't know that get us in trouble. It's the things we know that just ain't so.
Why is this thus? What is the reason of this thusness?