The Best external HDD for the Wii U is a High Endurance 256GB MicroSD card! – Pretzel Logix
Amazon.com: Nintendo Wii Key SD Card Adapter (SD Card NOT Included) : Video Games
Voultar on Twitter: "Wii-U NAND update. Did you know that you can read/write eMMC/eNAND memory with almost any PC card reader? To make this easier, I've designed a little MicroSD jig that'll
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Breath of the wild wii u on a micro sd card...and the rest of my wii u game downloads! - YouTube