For New 3DS, check MicroSD Cards Compatible With New Nintendo 3DS. A computer with a built-in SD Card reader or an external SD Card drive.

MicroSD cards are usually sold with an SD card adapter that fits into a standard reader. This option requires you to open the back of the New 3DS to take out the microSD card.

What are SD and micro-SD card readers? How can I add more ports to my computer? Ports and connectors are not always the first thing you think about when buying a computer, but it's good to know your ...