This mobile hard drive impresses with its compact format. Despite its small size, the disk has a storage capacity of three terabytes and provides enough space for your movies, music, photos and other files. Another feature of the WD: The hard drive has a USB interface. Through the USB 3.0 input, the data is transferred to the hard drive at lightning speed. In addition, the interface is used for USB 2.0. The WD hard drive is compatible with Windows 7 to Windows 10. It must be reformatted for the Apple operating system.