Apple MacBook Pro A1278 A1286 A1297 2nd 9.5mm SATA HDD SSD Caddy Adapter Bay Description:The 2nd Hard Disk Drive Adapter \/ Caddy to bring you new maximum data storage flexibility. With the 2nd HDD Caddy in your laptop， you can speed to backup important applications and key data. Features:Plug and PlayFast & Reliable connection in Apple Macbook， just as the primary HDDFully integrated into Apple Laptop， no cables\/PSU\/software driver neededDual boot， Support installation of 2nd operating system on the 2nd HDD and boot selectionCompatible for:Apple Macbook which uses 9.5mm thicknessHeight unibody Optical DriveSuper Drive with SATASerial ATA connector \/ interface.And works with 2.5" 9.5mm thickness SATA(Serial ATA) HHD( Hard drive )，and SSD( Solid State Drive ) as well.Simply remove your CD-ROM drive and put the Caddy (with the added hard drive) in it's place. Package includes:1 x Second HDD Caddy1 x Screwdriver More detail: