The Western Digital My Book Duo DAS (Direct Attached Storage) lets you store your data under one roof on its 6 TB storage space. It has a USB 3.0 interface and a spindle speed of 7200 RPM, to efficiently handle data transfer. This device has 2 bays and lets you manage RAID configurations. Its password protection feature keeps your data safe. Additionally, it measures 6.5 X 3.9 X 6.2 inches and weighs 4.8 lb.