Ultron 2.5" 640GB USB 2.0, eSATA. Hard drive capacity: 640 GB, Hard drive interface: USB 2.0, eSATA, Hard drive size: 63.5 mm (2.5 "). USB data transfer rates: 12, 480 Mbit/s, eSATA data transfer rates: 1.5, 3 Gbit/s. Colour of product: Black. Windows operating systems supported: Windows 2000, Windows XP, Windows Vista, Windows 7. Weight: 230 g, Width: 132 mm, Depth: 15 mm