Read Fails on Dual Samsung 850 Evo SSDs
I finally made the jump to upgrade my 2012 Mac Mini to dual Samsung 500gb 850 Evo SSDs and between the ifixit guide and the kit – everything went swimmingly. The issue arose once I tried to get OS X back onto the drives. I wanted to do a clean install from a USB drive or Internet Recovery and both kept failing. It would install, but I'd get the "no" error on boot (the circle with a slash through it).
I finally thought to install OS X on the other drive and it went in without a hitch. Looking in Disk Utility, the problem drive is the "upper" one (the one with the ifixit cable).
I ran a speed test and was getting the expected 500MB/s speeds on the "lower" drive, and the write test for the "upper" drive was 500MB/s, but the read test completely failed. Perplexed, I switched it out for a traditional HDD in that spot and everything was gravy. I even put that SSD in an external enclosure and everything was working fine on multiple machines.
Does anyone have any thoughts on why that may be happening? Did I miss something obvious during my research or install? Am I doomed to suffer?
Is this a good question?