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Amazon.com: 2nd HDD SSD Hard Drive Caddy for Apple MacBook Pro Unibody Mid- 2012 A1278 13-Inch Laptop MD101LL/A MD102LL/A MD101 MD102, SATA3 Second Solid State Drive Enclosure, CD DVD SuperDrive Optical Bay New :
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How to upgrade a Mid-2012 Macbook Pro to SSD | David Artiss
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Replace your 2009-2012 MacBook Pro HD with an SSD
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Upgrade Your Macbook Pro (SSD Upgrade, RAM Upgrade, Optical Drive Bay Adapter) - YouTube