General device type hard drive external desktop capacity 4tb interface usb 30 features ntfs formatted width 48 mm depth 135 mm height 1658 mm weight 950 g performance interface transfer rate 50 gbps usb 30 expansion amp connectivity interfaces usb 30 power power source included ac adapter power device power adapter voltage required ac 120230 v 5060 hz software amp system requirements software included wd smartware pro