64DD Main Unit
 

• High-speed, mass-volume memory magnetic disk drive

writable storage device attaches to bottom of the N64 console
disks are front-loaded, comparable to Iomega's ZipDrive
• Data access

Estimates range from 75ms to 150 ms (milliseconds) Average Seek time (AST)
Burst Access (not ideal for streaming video/audio)
• Data Transfer Rate (DTR)

.71 MB/second
Typical: 81 seconds for 64MB (normal speed CD-ROM: 437 seconds/64MB)
• Motor Driving Time

less than 1.9 seconds
• Includes a 4 MB RAMBUS DRAM expansion

plugs into memory expansion slot
enhances the memory capacity of the system (for both magnetic disks and cartridges)
• Custom ROM Chip

8MB ROM chip built into the drive, reportedly holds new midi sound banks and other helpful data routines
• System Clock

built-in clock can display the time of day
simulation games can feature dawn/dusk according to real-time
games could include changing content depending on day 

• High-density 3-3/4" magnetic disks

double-sided
64MB capacity
up to 38 MB writable
lower cost than cartridges

• Data error correction
• Modem capabilities

64DD modem capabilities are confirmed
potentials: download custom data
surf the web
update games
trade customized characters
multiplayer gaming
• Utilizes N64 hardware compression
• Writable game software

customize and save characters and games
self-evolving games
track editors
move data between different games, e.g. draw a face in a paint program and use it as a texture map in an adventure game
• Allows for expansion disks

cartridge games can be updated or expanded and used in tandem
• Multiple disk support

games on multiple disks are possible (memory card/cartridge saved data support), even if not "hot swappable." "Real" multiple disk support is not confirmed yet.

• May feature built-in internal modem

download custom data
surf the web
update games
trade customized characters
multiplayer online gaming

• Drive

260mm (w) x 190mm (d) x 78.7mm (h)
Combined with 65.5mm height of N64, both units are 144.2mm high)
1.6 kg 
• Disk

101mm (w)x103mm (d) x 10.2mm (h) 
43g

• MSRP: Between $99 and $149