Freecom FHD-2 20 GB USB-2 & FIREWIRE. Hard drive capacity: 20 GB, Hard drive rotational speed: 4200 RPM, Hard drive interface: USB 2.0, FireWire 400. Weight: 220 g. Operating temperature range (T-T): 5 - 60 °C. Average latency: 7.14 ms, Minimum system requirements: PC: Pentium-II 233MHz or higher, 64MB RAM, CD-ROM drive, Power requirements: No AC adapter needed