[TopHatHipster]

The Famicom Disk System's diskettes are overwritten by Disk Writer machines with special cartridges made for that machine. See a quick video about it: https://youtu.be/zFl5XK5P2Yo It does not use the internet at all.

The shown cartridges are not the ones that are used with games on them. The actual game carts for the machine were the same size factor as the international NES cartridges with a black & yellow Mario label on it, naming the game.