The Icy Dock MB662USEB-2S-1 is just one of their hard drive enclosures that not only can house two hard drives, but it can set your drives up in a RAID for some added peace of mind. The MB662USEB-2S-1 isn't much larger than a 3 ½" hard drive, so it can be considered portable as well. Icy Dock's MB662USEB-2S-1 features 1394b fire wire, e-SATA and USB 2.0 connectivity, and it supports up to 3TB HDD for a total of 6 Terabytes of storage on the go. The MB662USEB-2S-1 is constructed of solid aluminum for added portability, strength, and protection.