The Icy Dock MB994SP-4S can hold up to four 2.5" drives in a single 5.25" drive bay. Whether it is low power SSD drives or high RPM platter 2.5" drives, the Icy Dock MB994SP-4S can keep the thermal working environment within optimal levels using a pair of 40mm rear exhaust fans. Using Icy Dock's EZ Slide mini tray, swapping drives in or out of the MB994SP-4S Quad Bay 2.5" SATA Mobile Rack or other compatible Icy Dock enclosures is a simple, hassle-free process.