I've tried different usb hard drives (a Verbmatim, Toshiba, and a Sata to USB case) and with each one had trouble loading or installing usb games. Now im using different thumb drives i've got around the house (8 and 16 GB each), when I want to use a gem that is on a different drive I shut down the wii u change the drive and boot up again. My question is can I have more than one drive plugged in? Or the will mess up the system or something? Thanks in advance.