Run Games from Your SD Card
http://www.youtube.com/watch?v=kaBQFRsWxeo
I came across this video on another Wii U hacking site apparently this is working method to boot games that can be moved to USB Storage devices however this detected USB device is an SD Card inserted into a SD to USB adapter which might be a cheaper and cost effective method to get more storage for some of you. I can't confirm if this works or not but maybe some of you can.
Source Link: wiiuhacks.com/running-wii-u-games-off-an-sd-card/