hi guys - I have a Samsung SSD 850 EVO ready to replace my HDD in my old MBP (early 2009) however wanted to check how to enable TRIM before I install the OS ElCap on it as I rather not write anything to it without TRIM enabled first I have a USB to SATA cable that I plan to use to clean install the OS on my SSD and then open my MBP, replace my HDD with the SSD. Had a quick look at terminal and tried "trimforce enable" does seem to popup the y/n confirmation question (I quit by setting it to N for now). I am not sure if I should run this and set to "y" first (assume this will have no effect on my HDD) and then try to install ElCap on my SSD? So what is the sequence of steps to proceed: 1) trimforce enable + reboot 2) plug the SSD in via my USB / SATA cable 3) Install OS El Capitan - I have the file downloaded from app store for OS install 4) Open MBP and replace HDD with SSD Will this work OR do I need to run (1) AFTER I do (2)? Thoughts for a newbie? cheers all!