4 Things to Know About Adding a Second Drive to a 2012 MacBook Pro 13-Inch
Regarding the MacBook Pro: 1. The SuperDrive can be removed entirely You can pull out the optical drive and replace it with a caddy adapter to add a second internal drive.
Use an SSD for the operating system Install a fast SSD in the main bay to speed up boot times and app loading.
Use an HDD for bulk storage Put a high-capacity hard drive in the caddy for storing files, media, and backups.
The caddy adapter is inexpensive and easy to install A basic adapter costs around $10 to $20 and requires only a screwdriver and a few minutes of work.