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I did try using just the USB ports and they didn't supply enough power, so the wall adapter was my only option. It wasn't about saving USB ports, in my case anyways.
Just short info. Finally I checked my Seagate if it works with Wii U. It doesnt need external power, however, I bought Y cable before. There is no difference. Actually, hdd is on, system asks me for formatting. I havent checked if I can load games as hdd was plugged to Wii and hdd isn't found by wii hbc