The Nintendo 64DD (also abbreviated as the 64DD), is a disk drive add-on to the Nintendo 64. It uses magnetic disks instead of cartridges. The console was a commercial failure, as only 15,000 consoles were sold and another 85,000 unsold.
The 64DD was released on December 1, 1999. Throughout its short lifespan of 14 months, a total of 10 games were made and released, with several more cancelled ones.
The console failed because of its many delays, but also because the console could only be purcahsed through a Randnet subscription, rather than directly by the customer. Most of its planned games also failed to come out, but many of these games later were released for the N64's sucsessor, the GameCube.