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Well, I’m looking to buy the Samsung Evo 850 SSD M.2. The question is: is it compatible with my Macbook Pro Mid 2012? If not, which SSD do you recommend? I want to replace my optical CD/DVD drive. Thank you.

Your system has a traditional SATA III (6.0 Gb/s) interface so you only need a 2.5" drive. I would recommend sticking with the Samsung 850 EVO 2.5" SATA SSD