On the 5D3, when I delete files from card using the camera's menu (i.e. without taking the cards out) it deletes the files (except protected files) from the CF card but the SD card files are still there. (I have the camera set to write to both cards simultaneously.) Is there a way to get it to delete both cards without taking the cards out? I looked in the manual and checked different options, can't seem to figure it out. Thanks.