That should see you through the next eshop sale.
External hard drive with power supply for wii u.
At this price you get the biggest hard drive the wii u can still use plus it has an external power supply.
Portable external hard drives.
Fortunately the wii u supports external hard drives so even if you ve got the standard with its itty bitty 8gb drive you can add up 2tb of space.
From the above quote it appears that although the use of a y cable is already good enough you might still encounter a drive requiring more power than even two usb 2 0 ports.
For best results we recommend using a external storage device with its own power supply that connects to the wii u system via the usb port on the console.
Your other option is to use a portable external hard drive which normally gets power through its usb cable rather than an ac adapter.
Due to the wide range of external storage devices usability and performance will vary.