Hard Drive Caddy Tray 2nd HDD SSD Kit Compatible with 2.5" 9.5mm SATA HDD SSD 2nd HDD Adapter for Apple MacBook Pro Unibody 13 15 17 SuperDrive DVD Drive : Amazon.co.uk: Computers
Can You Upgrade the Hard Drive or SSD In Your Mac?
How to replace and upgrade a MacBook Pro hard disk - TechRepublic