The only way I figured out how to do it was to go into the Storage Settings from the dashboard. Unfortunately.
EDIT: Thought this was the 360 board.
Go into the memory settings
http://www.nintendo.com/consumer/systems/wiiu/en_na/system_settings.jsp --- whythefat "DDR, I notice your karma is 567. That 5+6+7= 18. 18 plus your IQ is 19. There were 19 hijackers on 911. You are a terrorist."