I've been trying to get a new 500 GB Samsung EVO SSD to mount to both a MBP Mid 2010 as well as a MBP Mid 2012 (which is the computer that will be upgraded) with no luck. I updated my Mid 2010 back around Christmas time, and I don't remember having this problem. Nothing shows up in Finder or Disk Utility when I plug the HD into the computer using the same SATA/USB cable that I used on my past upgrade. The cable was tested with another drive, and my computer detected it right away. I thought something might be wrong with the HD, so I exchanged for another it, but I'm running into the same issue with the replacement. I also tried to get the computer to detect it when I accessed Disk Utility in Internet Recovery, but it was not there. Has anyone ran into the same problem? Any solutions out there?