Asus N550 Series N550JV S550 S551LB S551 Laptop 2nd HDD SSD Caddy Second Hard Disk Drive CD DVD Optical Bay Replacement Condition: Brand New In Box, Never used. It's 9.5mm SATA Second HDD Caddy, comes without bezel, you can get it from the old opital drive, free a cross head screwdriver By replacing your CD DVD Superdrive optical drive, you can install up to a 3 TB hard drive in this enclosure to increase your available storage space. compatible with Windows OS, compatible for Most brands of laptops with 9.5 mm SATA internal Optical drives.