Model Number : N50 > N50-AS031C N50-123456 N50-234567 InterfaceUSB 2.0 to USB 2.0Capacities320G/500GPerformance5400 RPMContentsAN200 external hard disk USB 2.0 CableSystem RequirementsWindows 7 Windows Vista Windows XP Mac OS X 10.x or higherDimensions121.7*76*11mm