ICY DOCK 4x2.5 SSD to 5.25 Drive Bay Hot Swap Backplane Cage Mobile Rack Comparable to Tray-less Design - ExpressCage MB324SP-B Supports up to 4 x 2.5" sata/sas hdd/ssd into a single 5.25" bay Support SATA 6gbps or sas single channel (requires sas host) Hot-swappable bays for quick drive installation Accommodates 2.5" drives with 7mm, 9mm and12.5mm height Active power technology (apt) - only powers up if there is drive installed in the drive bay