Connectland CL-HD-MRUCD 5.25-Inch Mobile Rack SATA 5.25-Inch Removable Frame for 3.5-Inch SATA HDD, Unique Case Design Compliant with 3.5 SATA,SATA II, SATA 6Gb/s hard disk drive. Patented Silicon Aseismatic Design to avoid any Data Loss or HDD Damage from movement Unique Cover Design for Airflow. An Excellent Heat Sink Solution by using Airflow Holes at Front door and with 1 Fan at Rear