G-DRIVE mobile with Thunderbolt stylish, portable storage for laptop users featuring ultra-fast Thunderbolt and USB 3.0 interfaces. G-Technology combines 1TB capacity and a 7200RPM hard drive, together with Time Machine compatibility for quick backup of documents, music, digital video and photos. Also the G-DRIVE mobile with Thunderbolt is bus powered, and that means when you re on your way out, you don t need to add an external AC power supply to your laptop case. Interface: (1) Thunderbolt (1) USB 3.0 Drive Speed: 7200RPM Class Transfer Rate: Up to 136MB/s