DY-tech 2nd Hard Drive HDD SSD Caddy Adapter for ASUS X555L X555LA K555L Q551L R554L R556L GUC0N Add the 2nd drive to your laptop by replacing your optical drive; Notice: Universal SATA-to-SATA Optical bay Caddy Adapter Tray; Need to remove buyer's optical drive faceplate and mounting bracket / ejector latch to re-use onto the caddy for proper working! This device accepts 2.5" inch 9.5mm / 7mm high or less SATA HDD / SSD; Compatible with: for ASUS X555L X555LA K555L Q551L R554L R556L; Notice: Buyers need to remove their optical drive Front Panel(bezel) and Mounting Bracket to re-use onto the caddy for perfect match!!!