What happens if you format your Nintendo 3ds or what is formatting anyway?
With it you can reset everything to the factory settings. Everything on the 3DS is completely erased and removed without leaving any residue. If you want to sell your Nintendo, you do just that.
Yes, thank you.
Formatting is, so to speak, erasing everything. So the memory of your ds is completely empty afterwards. Your attitudes remain there. So scores, pictures, games (if you can download them on the ds at all), music and everything that was stored on the ds are permanently deleted. So think about whether you want to format your ds completely or whether you prefer to make a backup.