SD cards are enormously useful devices that hold more data every year. Reformatting an SD or microSD card can make sure all the data that was on it is gone.

Like this, or this, or even this. 2. Take your existing SD card out of your old 3DS, and transfer all the content to a folder on your computer. 3.

Tap Format as internal. Confirm your selection by tapping Format SD Card. Tap Move content. Formatting your SD card wipes any data on it, but it is necessary to transfer photos successfully.