ICY DOCK ExpressCage MB322SP-B 2 x 2.5" SATA/SAS HDD/SSD to 5.25" Mobile Rack with 3.5" HDD/Device Slot. If you're seeking a compact rack with versatility and functionality, we have a convenient enclosure just for you. The ExpressCage MB322SP-B is a mobile rack that converts a 5.25" device bay to fit two 2.5" SATA/SAS HDD/SSD (7mm-9.5mm), and includes a 3.5" slot for either a hard drive or a 3.5" device. With the unique tool-less drive installation design, the ExpressTray Mini allows you to install your 2.5" SATA or SAS HDD/SSD simpler than ever, and the optional bottom tray screw holes are provided for added stability. The MB322SP-B has a detachable dust cover which keeps the front panel enclosed to block out dust particles when the 3.5" slot is left unused or when there's a 3.5" HDD installed. Soft blue LED indicator lights on each 2.5" drive bay notify you when drives are being used without being too distracting. For maximum durability we have implemented enhanced door latches and a solid metal housing.