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How To Add Second A SSD to Replace Optical Drive MacBook Pro 2012 - YouTube
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Install an SSD into the optical superdrive slot on a MacBook Pro | OSXDaily
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OWC Data Doubler - Replace Mac Optical Drive with an SSD
How to Replace MacBook Pro Optical Drive with SSD: EveryMac.com
How-To: Swap Your iMac, Mac mini or MacBook CD/DVD drive for a super-fast SSD - 9to5Mac