I just got a 2012 mac mini which has two drives in it and I'm going to replace one of them with an SSD for the system drive. I saw a few posts which say to look in System info under Sata and the drives will be listed as upper and lower. Unfortunately on my system when I look under Sata is shows just one drive, and under storage is shows the other. Is there a way to tell which drive is upper and which is lower? And should the new ssd I put in for the system be in the slot that shows up under sata, or under storage? thanks!