Sabrent DS-U3B4: 4-Bay USB 3.0 SATA 2.5"/3.5" SSD/HDD Docking Station. This device allows you to quickly transfer data between four hard drives. With a single USB cable, you can connect up to four 2.5”/3.5” SATA Hard Drives to your Desktop or Notebook. You can also use it as a standalone duplicator to clone data from one hard drive to another without connecting to a computer. The device has LED indicators to show the status of each bay and the cloning process. It supports Windows and Mac OS.