The Family Computer Disk System (Famicom Disk System) add-on for the Family Computer has a library of ' officially licensed games during its initial lifespan, 138 of which were not released on the standard Famicom or NES cartridge format plus 6 additional part 2 disks that served as an extension to previously released part 1 disks. Of these, 148 were released exclusively in Japan, and 46 would be released internationally for the Nintendo Entertainment System in some form. Cartridge games for the Famicom and NES are in the list of Nintendo Entertainment System games.