The Best external HDD for the Wii U is a High Endurance 256GB MicroSD card! – Pretzel Logix
Amazon.com: SanDisk Ultra 1TB Micro SD Card Works with Nintendo Switch & Nintendo Switch Lite Console (SDSQUA4-1T00-GN6MN) UHS-1 Class 10 Bundle with (1) Everything But Stromboli SD & MicroSD Memory Card Reader :
What to Do If the SD Card is Not Recognized in the Nintendo Wii U SUPPORTrix
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using a really tiny MicroSD to USB adapter as Wii U hdd? | GBAtemp.net - The Independent Video Game Community