SATA 9.5mm 2nd HDD HD Hard Drive Caddy Case for Apple macbook pro A1278 A1286 A1297 CD ROM Optical Bay 100% Brand New 9.5mm-thick caddy. HDD Interface: SATA ,Laptop/Mother Board Interface: SATA It enables you to add a second notebook hard disk drive to any modular bay. This 2nd Hard Disk Drive Adapter that gives you maximum storage. compatible with macbook that has a 9.5mm-thick / high optical bay with a SATA interface.