Amazon.com: 2nd HDD SSD Hard Drive Caddy for Apple MacBook Pro Unibody Mid- 2012 A1278 13-Inch Laptop MD101LL/A MD102LL/A MD101 MD102, SATA3 Second Solid State Drive Enclosure, CD DVD SuperDrive Optical Bay New :
MacBook Pro 13" Retina Display Late 2012 SSD Replacement - iFixit Repair Guide
MacBook Pro 13" Retina Display Late 2012 SSD Replacement - iFixit Repair Guide
USB3.0 Hard disk Enclosure for 2012 Apple MacBook pro 7+17pin Disassemble SSD | eBay