Famicom Disk System

The Famicom Disk System (Japanese: ファミリーコンピュータ ディスクシステム) was a Japan-only peripheral for the Famicom (known as the Nintendo Entertainment System in North America). The Disk System connected to the Famicom via a cartidge slot adapter and used rewritable double-sided floppy disks ("Disk Cards") to store game data. These Disk Cards were the first Famicom games to allow a player to save their game progress.

Many popular Famicom games such as The Legend of Zelda, Metroid, and Kid Icarus were originally released as Disk System titles. Most Disk System titles were later re-released as regular cartridges, using passwords or battery-backed memory to save game progress in lieu of the Disk Cards' rewritable memory.

Zelda games

 * The Legend of Zelda (was later re-released on cartridge)
 * Zelda II: The Adventure of Link (was later re-released on cartridge)