I have a general question. I looked in the instruction manual and just couldn't find the answer readily, so I figured I'd ask the larger group. I just got my 5d3, and I keep both a CF and a SD card in the memory slots. I record my files solely to the CF card. Whenever I take the CF card out to copy the files to my computer (camera is powered off) and then return the CF card back to the camera, the camera automatically switches to the SD card when I power it back on, even though I want to continue recording to the CF. It's a minor step to get the camera to revert back to the CF card, but it's still an inconvenience. Does anyone know how to prevent the auto-switching?