The Famicom Disk System (ファミコン ディスクシステム, Famikon Disuku Shisutemu) was released on February 21, 1986 by Nintendo as a peripheral to their overwhelmingly popular Family Computer ("Famicom") console in Japan. It was a unit that sat underneath the Famicom and used proprietary floppy disks for data storage. It was announced, but never released for the North American Nintendo Entertainment System.
In the Super Smash Bros. series
Several playable characters in the series originated from Disk System titles (in their Japanese versions). They include: