G-Technology G-DRIVE USB 3.0 4TB External Hard Drive (0G03594) High speed USB 3.0 for universal, high-speed data transfer Solid, stylish all-aluminum case for durability With capacities up to 10TB for multimedia intensive files (Total accessible capacity varies depending on operating environment.) Time Machine-ready for easy file back-up Plug-and-play on Mac; easily reformatted on Windows 3-year limited manufacturer's warranty