Upgrade your OS X Book or OS X Book Pro with this versatile 2nd HDD SSD Caddy, designed to transform your laptop's 9.5mm optical drive bay into valuable storage space. This innovative solution supports 2.5-inch hard drives and SSDs, offering impressive data transfer speeds up to 6Gbps through technology. Installation is straightforward with no extra cables or software needed - simply use the included screwdrivers and screws for a quick setup. for users seeking expanded storage or dual-boot capabilities, this caddy is compatible with numerous OS X Book (MD101 through MD104) and other OS X notebooks produced since 2009. The thoughtfully engineered design features built-in heat dissipation to maintain optimal performance. Each package includes two complete sets of caddies with mounting hardware, allowing you to upgrade multiple devices or keep a spare on hand. Note that while design variations may occur in shipment, all versions maintain full functionality and compatibility with supported devices.