How to upgrade your MacBook Pro with an SSD - CNET
Macbook Pro A1278 Hard Drive Replacement | Macbook Pro A1278 Hdd Replacement - 2nd - Aliexpress
Installing MacBook Unibody Model A1278 Dual Hard Drive - iFixit Repair Guide
How To Add Second A SSD to Replace Optical Drive MacBook Pro 2012 - YouTube
Techinal Hard Disk Drive Adapter HDD Caddy SATA SSD Bracket for Apple-MacBook Pro A1278 A1286 A1297 - Walmart.com
Zapplerepair | M.2 SATA SSD can't be paired to SSD NVME Converter, SSD NVME Converter MacBook A1466 2012, Installing SSD NVME Converter on MacBook
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 SSD Drive Upgrade 128GB Sierra 10.12 2.5 2011 2012 A1278 solid state 619659084141 | eBay
Macbook Gets NVMe SSD With Help Of A BGA-Imitating PCB | Hackaday