Ideal for the home office or dorm Seagate Expansion 4TB STKR4000400 desktop hard drive offers enormous desktop storage for photos movies music and more. Backing up and transferring content is incredibly easy — just drag and drop or use the included Toolkit backup software for on-demand and automatic backup of your files! To get set up connect the USB hard drive to Windows or Mac — no software required. For Apple Time Machine simply reformat. Included is an 18-inch USB 3.0 cable and 18W power adapter.