Silicon Power Armor A50 Portable 500 GB USB 2.0 External Hard Drive SP500GBPHDA50S2G (Gold) Data Transfer Rates Max. 480 Mbps (USB 2.0 Mode) Max. 12 Mbps (USB 1.1 Mode) In compliance with US military MIL-STD-810F transit drop test One Touch backup button LED status light to indicate transfer modes Interface: USB 2.0 / 1.1 Armor A50features raised imprinted SP logo Supported Operating Systems Windows Vista, Win XP, Windows 2000, Mac OS 9.0.4 or later SP Widget free download software features seven main functions to maximize your SP Portable Hard Drive