DY-tech 2nd Hard Drive HDD SSD Caddy for iMac 20 21.5 27 inch 2009 2010 2011 Early Late Add the 2nd drive to your laptop by replacing your optical drive; This is universal 12.7mm height SATA-to-SATA Optical bay Caddy Frame Adapter Tray; After received it, buyers need to remove their optical drive faceplate and mounting bracket to re-use onto the caddy for proper working! This device accepts 2.5" inch 12.5mm / 9.5mm / 7mm high or less SATA HDD / SSD; Compatible with: for iMac 20 21.5 27 inch 2009 2010 2011 Early Late Notice: Buyers need to remove their optical drive Front Panel(bezel) and Mounting Bracket to re-use onto the caddy for perfect match!!!