GUIDE] Assemble NVMe SSD to A1278 MacBook Pro (MBP 13-inch 2012 + NevBolt-1) - YouTube
How To Add Second A SSD to Replace Optical Drive MacBook Pro 2012 - YouTube
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 :
Apple A1278 MacBook Pro 2011 2.8Ghz 8GB RAM 240GB SSD os10.13 1520 Cyc