Portable hard drive is fully USB powered—no external power supply required. It features a unique industrial design with brushed silver casing. A status indicator light lets you know the drive is working. Drive Type: Portable Hard Drive; Maximum Native Data Capacity: 500 GB; Connector/Port/Interface: USB 2.0; Operating System Compatibility: Mac® OS X 10.5 10.6; Windows® XP Vista™ 7.