In 1989, Sega introduced a joint project with Sony: an FDD drive for Megadrive using 2" discs of its own forma

In 1989, Sega introduced a joint project with Sony: an FDD drive for Megadrive using 2" discs of its own format. It was intended to be a kind of analogue of the Nintendo FDS, but with even wider capabilities. For example, if there was also a branded Sega modem, you could download add-ons for games - that is, DLC! #game