I thought that this would be a no-brainer, but I'm finding conflicting information when I research. I have two late 2012 Mac minis that I want to upgrade with Fusion drives. The first is my wife's i5 with the stock 500GB HDD. I bought the OWC upgrade kit with a 120GB SSD, and I have a 1TB HDD that I'm going to use to replace the 500GB drive. It's one of those minis where the boot drive is in the upper bay. I bought the necessary add-on kit and have the OWC instructions for this configuration. I have an electrical engineering degree and have worked as a technician, so I'm fine with the physical part of the installation. I'll be migrating the data from another Mac mini, for which I also have a bootable clone HDD. My confusion is with what I need to do to create the Fusion drive. I've found instructions from 2012, 2014, 2015, 2016, and 2017. They all reference Mountain Lion, giving the Terminal commands to create a Fusion drive, but saying that later versions of OS X should let you do it from Disk Utility. (Why would a 2017 post talk about Mountain Lion?) Then I read a couple threads saying that if you bought a Mac mini 2014, it came with a special version of OS X Disk Utility that lets you create a Fusion drive, but "regular" versions of OS X don't let you do this. Then I found a thread saying that the Terminal method doesn't work in Sierra. I found other threads saying that this is nonsense. Can someone please tell me what I need to do from the software standpoint? I have a new SSD and HDD that I'll install in my wife's i5 Mac mini, and I want to create a Fusion drive. I'll migrate the data afterward from my other Mac mini (an i7 quad-core). Then I want to do something similar with my i7 Mac mini. It has the stock 1TB HDD. I want to create a Fusion drive with a 1TB SSD and a 2TB SSD. The boot drive is in the lower bay in this computer. The only difference is that I also want to create a Boot Camp partition for Windows 10. I also have a 2015 13" MBP, and I'll either migrate the data from that or do a fresh install of everything, but the idea is that my 3TB Mac mini will be my "base station," and my MBP will be my mobile computer. I'm starting a business, and I figured it's a good idea to have two computers in case something happens to one of them. Anyway, please point me in the right direction, and let me know of any caveats I need to be aware of. Thanks!