Seagate GoFlex Desk Mac 3TB 3.5" FireWire 800 / USB 2.0. Hard drive capacity: 3000 GB, Hard drive interface: FireWire 800, USB 2.0, Hard drive size: 88.9 mm (3.5 "). Data transfer rate: 800 Mbit/s, USB data transfer rates: 12, 480 Mbit/s, FireWire data transfer rates: 800 Mbit/s. Width: 44 mm, Depth: 124 mm, Height: 158 mm. Cables included: FireWire, USB