SSD adapter kit: replace Apple SuperDrive with hard disk
MADLAWMEDIA— Turn Your MacBook Pro (Mid-2012) into a Super Machine
How to install an SSD on a 15-inch Retina MacBook Pro
OWC Data Doubler - Replace Mac Optical Drive with an SSD
How to Replace MacBook Pro Optical Drive with SSD: EveryMac.com
2012 Macbook Pro 13" A1278 DVD Super Drive Replacement - YouTube
HDD Caddy for Macbook Pro 13, 15, 17 inch Unibody
Upgrade Your Macbook Pro (SSD Upgrade, RAM Upgrade, Optical Drive Bay Adapter) - YouTube
Advice from an Apple Tech: How to replace the optical drive in a Unibody MacBook Pro with a second hard drive | Macworld
MacBook upgrades within the repair program would be a win-win
OWC Data Doubler Optical Bay Hard Drive/SSD... at MacSales.com
ESYNIC Hard Drive Caddy Tray 2.5" 2nd HDD SDD Kit 9.5mm SATA HDD SSD Adapter Optical Bay Drive Slot for MacBook Pro Unibody 13 15 17 SuperDrive DVD Drive Replacement Only : Amazon.ae: Computers
Padarsey 2nd HDD SSD Hard Drive Caddy Tray Replacement for MacBook Pro 13/15/17 inch A1278 A1286 A1297 2008 2009 2010 2011 2012 Internal Laptop CD/DVD-ROM Optical SuperDrive Adapter to 2.5 Inch 9.5MM : Amazon.ae: Computers
How to add a fast new SSD to your old Mac or MacBook for only $150 - 9to5Mac