The Famicom Disk System was introduced in 1986 in Japan as a peripheral for the Nintendo Famicom (Family Computer), and used proprietary 3-inch floppy disks (known as ‘disk cards’).
Disks were double-sided, with a total capacity of 112 KB, and were a modified version of the Mitsumi Quick Disk. Most disks did not have a shutter to keep dirt out (a few games were released on blue disks that did have shutters).
Unlike ROM cartridges of the time, the disks allowed games to have a save feature, but games were slower to load than using ROM cartridges.
Over 200 titles were released for the Famicom Disk System, but by 1990 very few games were being released on the format.