Answer to "HDD Upgrade/Replacement with SSD?"I contacted Crucial customer service about thermal sensor problem. Crucial MX200 1TB SATA 6Gb/s 2.5" Seems to be 100% compatible with my mid 2015 27" retina iMac. They answered that I don't have to use any additional hardware or software to make it work as good as my old 3.5" HDD. So any advice? Do I trust them? If they say it's 100% compatible without thermal sensor mess. Don't want to open my iMac for nothing.