How-To: Now's the right time to swap your old iMac's hard drive for a fast new SSD - 9to5Mac
Installing MacBook Pro 13" Unibody Mid 2012 Dual Hard Drive - iFixit Repair Guide
OWC Data Doubler Optical Bay Hard Drive/SSD Mounting Solution
Install a 2nd HDD/SSD by replacing the optical drive - Upgrade your old Macbook pro - 9to5Mac
Black Friday Hard Drive Caddy Tray for Apple Unibody MacBook / MacBook Pro 13 15 17 SuperDrive (Replacement Only) from BrainyTr… | Hard drive caddy, Hdd, Hard drive
Review: MaxConnect USB External Enclosure for Unibody MBP Optical Drive | Jeff Geerling
Optical Drive to SSD Upgrade | Cool Tools
How to Replace MacBook Pro Optical Drive with SSD: EveryMac.com
The Case For A MacBook Pro Without An Optical Drive | Cult of Mac
Why does my macbook pro power off the internal SSD drive? - Super User
OWC Data Doubler, optical to SATA Drive Converter Bracket Solution for MB,MBP Late 2008-2012/Current
OWC Data Doubler - Replace Mac Optical Drive with an SSD
MacBook Pro 15" Unibody Early 2011 Optical Drive Replacement - iFixit Repair Guide