WHEN YOUR DS LITE R4 MICROSD (64GB) HAS MORE STORAGE THAN YOUR 2DS XL MICROSD (32GB); SO YOU PUT YOUR R4 CARD IN YOUR 2DS XL AND PRESS START WHEN BOOTING IT UP TO GET A TOTAL OF 96GB, WHEREAS 66⅔% CAN BE USED FOR ANY FILE STORAGE BUT IS NOT ACCESSIBLE VIA ANY 3DS FILE MANAGERS AND IS ONLY ABLE TO RUN .NDS ROMS AND CONTAIN DIRECTORIES.