OWC Data Doubler Optical Bay Hard Drive/SSD... at MacSales.com
OWC Data Doubler: Get 2 Drives in your MacBook Pro
Install a 2nd HDD/SSD by replacing the optical drive - Upgrade your old Macbook pro - 9to5Mac
Mid 2012 MacBook Pro Hard Drive Cable Failure (821-1480-A, 821-2049-A, 821-2480-A) | BeetsBlog
Ultimate Guide on How to Upgrade Mid 2012 MacBook Pro: Faster and Better Than New! | College Lighthouse
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How to Replace MacBook Pro Optical Drive with SSD: EveryMac.com
Macbook Pro Mid 2012 SSD Upgrade - YouTube
How To Add Second A SSD to Replace Optical Drive MacBook Pro 2012 - YouTube
Upgrade Your Macbook Pro (SSD Upgrade, RAM Upgrade, Optical Drive Bay Adapter) - YouTube
13″ MacBook Pro teardown: Easy SSD, trackpad access, no room for RAM | Ars Technica
How to upgrade a Mid-2012 Macbook Pro to SSD | David Artiss
OWC Data Doubler - Replace Mac Optical Drive with an SSD