Seagate Expansion 20tb External Hard Drive HDD - Usb 3.0.

Easy-to-use desktop hard drive—simply plug in the power adapter and USB cable USB 3.0 allows fast file transfers for efficient data management Drag-and-drop file saving right out of the box Automatic recognition of Windows and Mac computers for simple setup (Reformatting required for use with Time Machine) Enjoy peace of mind with the included limited warranty and Rescue Data Recovery Services