Freecom ValueLoader VS-640 - 320-640 GB (8 x 40-80GB), External. Native capacity: 320 GB, Compressed capacity: 640 GB. Supported data transfer rates: Performance in GB/Hr native/compressed): 10.8 / 21.6. Operating relative humidity range: 20 - 80 %, Operating temperature range (T-T): 10 - 40 °C. Dimensions (WxDxH): 419 x 609 x 84 mm, Weight: 14.96 kg