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Are you getting error code 150-1093 from your shiny (very shiny) new Wii U? Reader Matt did, and it was a bummer. Games were freezing at load, leaving him with a confusing error code and no Mario.
Nintendo support told him that this code results when you try to load a game from an external hard drive that isn't powered. Nintendo has warned that only hard drives plugged into the wall or into two USB ports with a Y cable will be supported, and now we see the problem.
The short-term solution is simpler than getting a new hard drive or cable, though. Just go into your system settings and transfer the game's data to your system when playing. "This process takes approximately 2 minutes to complete," Matt tells us. It's another annoying user experience hiccup – why not just tell users "hey, go plug in your hard drive?" – but at least it's easily dealt with.
~ Source