Silicon Power Rugged Armor A80 640 GB 2.5-Inch USB 3.0 and USB 2.0 Military Grade Portable External Hard Drive SP500GBPHDA80S3B (Blue) USB 3.0 Super Speed (High speed transfer rate up to 5 Gbps/sec) USB 2.0 backward compatible Meets MIL-STD water resistant standard "IEC 529 IPX7" Meets U.S. Military drop-test standards MIL-STD-810F 516.5 procedure IV SP Widget free download software features seven main functions to maximize your SP Portable Hard Drive Anti-pressure and anti-dust function