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 :
Amazon.com: HDD SSD SATA Hard Drive Connector for Pro 13" A1278 Pro8,1 Early 2011: MC700LL/A MC724LL/A Late 2011: MD313LL/A MD314LL/A : Electronics