The Nintendo 64DD (Nintendo 64 Disk Drive) was an add-on for the Nintendo 64 released exclusively in Japan. Plans were made to release it elsewhere, though after failing to make an impression in Japan the plans were cut. Its failure could perhaps be attributed to the lack of triple A titles on the service, its release late in the console's life, and the multitude of broken promises could have made some gamers annoyed. For example, The Legend of Zelda: Ocarina of Time and The Legend of Zelda: Majora's Mask were both planned to make use of it, though were eventually released as cartridges. The Nintendo 64DD was intended to give more memory space to games that needed it. The player would be required to plug the accessory onto the bottom of the console. It nearly doubled the size of the Nintendo 64.
List of games that use Nintendo 64DDEdit
Only nine games were released for the add-on.