Seagate Backup Plus 1TB Thunderbolt Portable External Hard Drive for Mac (STBW1000403) High-performance portable hard drive - no external power supply required 10 Gbps interface is up to 20x faster than USB 2.0 and up to 12x faster than FireWire 800 Connect your Backup Plus for Mac with Thunderbolt directly to your compatible computer or at the end of a daisy-chain