Deyoung 2nd SATA Hard Drive HDD SSD Caddy Adapter for ASUS k55N N56JN N56VZ-S4278H Add a 2nd drive to your laptop by replacing your optical drive; This is universal 12.7mm height SATA-to-SATA Optical bay Caddy Adapter Tray; This device accepts 2.5" inch 12.5mm / 9.5mm / 7mm high or less SATA HDD / SSD; Compatible with:ASUS k55N N56JN N56VZ-S4278H Notice: Buyers need to remove their optical drive faceplate(bezel) and Bracket to re-use onto the caddy for proper working!!!