Model: KF-4002-BK 3.5" Internal hot swap rack raid-4 bay No inner tray required Space for 4 H.D.D. w/ 3 bay slots Easy transport and secure valuable data Easy open latch door LED indicator One 120 x 120 mm rear fan Patent NSS (Non-Scratch SATA connector) 50,000 times insertion rate Supports hot swap Supports SATA III (6.0 Gb/s) Tool-less design for H.D.D. installation Tray-less design Driver-free support Key lock system for added security Hot-Swap function requires SATA Controller Support for up to 4TB HDD