Compatible 4 Channels switch help to improve the compatibility. You can try to move " A""B""C""D" if your Laptop can not read HDD. Replace your laptop CD / DVD drive with a second hard drive or solid-state drive Works with all laptops that have a 9.5mm SATA optical bay Fully integrated into laptop, no cables/PSU/software driver need. Package - 9.5mm Hard Drive Caddy, Faceplate, Screwdriver, 4 Screw Product Type: 9.5MM Universal Optical UltraBay caddy
