BRIAN SAYS… Whilst you can have separate cards for stills and video, the priority setting determines that the primary first card should be used when present and with available space. If you have two cards in the camera and remove one to download pictures then close the card door, the camera normally switches to the remaining card. When you return the primary card to the camera the camera switches back to the primary card automatically. With the priority card set, you ensure that all photographs and video are saved on the priority card whenever it is present and until it reaches capacity.