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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 :
Does the mid-2012 13 MacBook Pro have an M.2 slot that I can use for an Intel Optane memory upgrade? - Quora
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Amazon.com: MCE Technologies 2TB Internal SSD Flash Upgrade for 13" and 15" MacBook Pro Retina (Mid 2012 - Early 2013) - Includes Installation Kit! : Electronics
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