The MB153SP-B has been redesigned to be a lighter module, while 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 3 x 3.5in. SATA III hard drives, while only consuming two 5.25in. bays. The module has also been redesigned for the type of power connector accepted. 15-pin SATA power is used to provide better accessibility for various host systems.Along with being a lighter package, the cooling has been improved to provide better air flow to your hard drives. The MB153SP-B uses a full metal body that allows for the best heat dissipation possible in various types of applications. In addition, the enhanced direct air flow design allows the included cooling fan to raise its efficiency to cool down your hard drives, by closing and rerouting any side vents to route incoming air directly to the cooling fan, as well as sealing any vents around the fan for better cooling efficiency. In addition, the backplane logic PCB has larger vents in key areas to allow more air to flow into and exit the MB153SP-B, making it an ideal system to store and cool your hard drives. Icy Dock MB153SP-B DAS Array - 3 x HDD Supported is one of many NAS (Network-Attached Storage) available through Office Depot. Made by Icy Dock.