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Message: <blockquote data-quote="MacInWin" data-source="post: 1621753">I have almost the same MBP. Mine is early 2011. I replaced the internal HD with an SSD and am running Yosemite just fine. So it's do-able.Now as for the Samsung SSD, I think it will work, but you won't have TRIM. Apple doesn't support TRIM on anything but their own internal SSDs. There used to be third party software that would support TRIM, but it did that by adding a kext file to the system and Apple has now, in Yosemite, closed that path because kext files are a path for malware and worse to get into your system. Only "Apple signed" kext files are acceptable.  Here is a link that explains it all <a href="http://www.cindori.org/trim-enabler-and-yosemite/" target="_blank">Link</a>So, here are the options:Get a different SSD, preferably one from OWC. Their drives don't need TRIM as they have their own internal garbage collection processes.  That's the way I went.  Your Samsung isn't a loss, however, as you can get OWCs Data Doubler kit and mount the Samsung in the Optical drive space to have two internal SSDs. That's my configuration, with an OWC boot drive and a Crucial drive in the optical bay.  The only downside I have seen is that DVD Player thinks the optical drive is still there, doesn't find it and won't run with an external DVD player. (I took the Apple Superdrive out and put it in an enclosure I also got from OWC.) But VLC plays DVD's just fine from the external and the external will mount as a data drive just fine, it's only DVD Player that doesn't seem to understand. Option two is to mount the SSD in the HD space and live without TRIM. That's not fatal, it just means that your drive will not be as efficient as it could be. The second drive in my system doesn't have TRIM and it seems to be cruising along just fine. If it slows down, I'll back it up, repartition and reformat and restore, which should sort out the TRIM issue pretty well. IF it gets bad enough I may just replace it with another OWC drive that has internal TRIM. But it's been in there a year now, working just fine as a data drive. Of course, as a data store and not the boot drive, there is a lot less "churn" on the drive so you may see the performance hit sooner if you put the Samsung in the boot drive.Or you can get a drive from OWC, sell the Samsung (or return it if you can) and leave the optical bay alone.So, there you go.</blockquote>

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