Features and Specs
Hardware Specifications
Storage
- 256 Mbytes (2 Gbit) DDR2 SDRAM
- microSD memory card slot (up to 128GB)
Transfer Speeds
- USB: 20+ Mbyte/sec
- SD: 23 Mbyte/sec

Have many hours of work in a game you played a while ago? You can now backup the save data to a PC, and restore it later.
Definitely useful for servicing games with internal batteries.
No knowledge is necessary to use UltraSave. Instead of using a large lookup table to know about all the different games out there, it uses advanced heuristics to not only detect the game size but layout as well.
Now it's possible to transfer saves between a real game and an emulator, or the 64drive itself. (All 64drives ever produced are compatible)
Requires a 12V DC center-tip positive power brick