With the Logi Link docking station you can connect up to two 6.4 cm (2.5") & 8.9 cm (3.5") SATA hard disks to your computer without using a PC or external hard disk casing. Connecting to the computer is easy with the USB (Universal Serial Bus) 3.0 cable included. The power supply & data flow are displayed by LED lights & pressing the eject button disconnects the hard disk so it can be removed. If two hard disks are connected, the clone function can be used to clone the hard drives without a PC.