The D800 manual says that the Format option only deletes the index of the card and doesn't do a low level format. So you know if there is any option (maybe an "hidden" option) that can do a low level format of the CF/SD cards?
#1. "RE: Low level format with D800" In response to Reply # 0
I am unaware of any way to do a low level format in camera. Periodically, I will do a disk check and low level format on the PC with a card reader. I then reformat when putting the card into the camera.