SSD Drive for Mac

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what's the best 500 gigabyte SSD drive to use to replace the drive in my 2012 Mac?

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What model? 2012 iMac, MacBook Air, MacBook Pro? Are you trying to replace the optical drive, the hard drive, or upgrading SSD sizes. If you need a place to start OWC is the starting place for various Mac upgrades.

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I put a Samsung 850 pro in my wife's MacBook and it has been great. I have heard the Evo's have issues for some people.

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I did that on my 2010 Mac that I handed down to my father which is running like a champ.

A standard SATA SSD only works when you are replacing a SATA hard drive or an optical drive in an older Macs and Mac Pros, but since the body redesign of the Macbook Air and the Retina MacBook Pros they have used a proprietary PCIe SSDs (which have been ludicrously fast) but there have been no after market options to replace or upgrade these until recently (and even then there is a small performance penalty from the stock SSDs)

TL;DR OP didn't specify his rig so I gave the broadest solution for all 2012 Macs.