Iomega 1TB Helium. Hard drive capacity: 1000 GB, Hard drive interface: USB 2.0, Hard drive size: 63.5 mm (2.5 "). USB data transfer rates: 480 Mbit/s. Colour of product: Silver. Weight: 0.231 kg, Width: 77 mm, Depth: 120 mm. Security algorithms supported: 256-bit AES