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If you are formatting your SD Card used with a Nintendo product, use the tool found here. Nintendo products strictly adhere to the SD Card standard.
Instructions on using this tool can be found at the bottom of this page. Please select "FULL (OverWrite)" when formatting the card.
Step by step instructions on inserting an SD card into the Wii U console.
Do not turn off the Wii U console or remove the SD card while data is being read or written. Doing so may cause damage to the Wii U console or SD card or cause loss of data.
Step by step instructions on removing an SD Card from the Wii U console.