I had a Samsung 830 512GB SSD in my early 2011 MBP since May of 2012. I initially recall Samsung support telling me to Enable TRIM, it will prove beneficial for the drive. With different, various OS updates, TRIM was disabled.... as I believe anyway. Since my El Capitan install a few days ago, I enabled TRIM in the terminal window 'sudo trimforce enable', reboots, system report shows 'TRIM Support: Yes' so all was good, I was further experimenting. I actually think my MBP sped up after a few days, bit it might have been a placebo thing... right? Speed tests actually improved! But back to my main concern. I CCC'd to a new Samsung 850 Pro 1TB SSD. Installed the new drive. All my settings carried over of course. I opened a terminal window, and went through the disable TRIM motion 'sudo trimforce disable' it goes through the process, says successful or something of that nature, reboots... but when I check system report again.... 'Trim Support: Yes' It did NOT disable... despite saying it did! Help, any suggestions, tips, know ways of resolving?__________ As I understand from reading quite a bit on the new Samsung 850 Pro drives... the controller does a good enough job with garbage control, Toms Hardware also ran some tests on the 850 Pro 1TB and it did better without TRIM, faster overall.