Wii U hard drive incompatibility fix
If you want to expand your Wii U’s memory but the Hard Drive you currently own isn’t being picked up by your Wii U (like mine did at first), there is a solution other than buying a Nintendo tested hard drive. You can purchase a USB Y cable such as the one shown in the picture which you can buy right here. Why this fixes the issue I’m not sure but I guess it has something to do with Nintendo’s recommendation that you purchase a hard drive that has its own external power source and the fact that these cables are specifically made to increase power and data connection between the hard drive and the connected device.
(Note: My first and only experience using this fix was to play “The Cave” demo directly from my hard drive. However I encountered frame rate drops and I’m not sure if this is because I was using a hard drive that wouldn’t normally be compatible with Wii U or if this is was simply a badly optimised game. If you also experienced frame drops in “The Cave”s demo please let me know in the comments)