How to Format an SD Card or microSD Card
Nintendo 3DS
In this article, you'll learn what you'll need to format an SD Card.
Nintendo recommends using the SD Association's SD Memory Card Formatter to format any SD cards that will be used with a Nintendo product. Nintendo products strictly adhere to the SD card standard.
Instructions on using this tool can be found at the bottom of the tool's page on the SD Association website. Please select Overwrite format when formatting the card.
