Nimitz 2nd HDD SSD Hard Drive Caddy for Dell Alienware 14 M14x XPS 14z 15z ,XPS Studio 13(1340) 15(l521x) Studio 1569 Add a 2nd drive to your laptop by replacing your optical drive Mounting screw-holes on caddy provided so you can transfer your original optical drive's mounting brackets to the caddy Works in 9.5mm optical drive bay of Dell Alienware 14 M14x XPS 14z 15z ,XPS Studio 13(1340) 15(l521x) Studio 1569 Works with 2.5" SATA drives with heights equal to or less than 9.5mm (also compatible with 9.5mm SSD)