Family Computer Disk System or Famicom Disk System, is a peripheral for Nintendo's Family Computer and was released only in Japan.
Useful info:
Family Computer Disk System uses proprietary floppy disks called "Disk Cards" for cheaper data storage
Also adds a new high-fidelity sound channel for supporting FDS games
Release date: 21 February 1986 in Japan
Discontinue date: 1990
Units sold: 4.4 million
Final game was released in 1992
Nintendo officially discontinued its technical support in 2003
