The MB155SP-B built to be a lighter module, while more importantly maintaining the same level of quality, build, and service you’d expect from an Icy Dock product. While the design has gone through some changes, the space saving design is still established. The backplane module allows up to a massive 5 x 3.5” SATA III hard drives, while only consuming three external 5.25” bays. The FatCage has also been redesigned for the type of power connector accepted. 15 pin SATA power is used to provide better accessibility for most modern host systems. They are also compatible with cables with metal latches to improve security when installed into a system.