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I am trying to find a good guide and parts I need to buy to modify my current 5400rpm 1TB HDD and add a SSD to make a Fusion Drive. All I can find is this: Mac mini Late 2014 Repair
Our guides are structured from a hardware perspective which can be a bit confusing when you are trying to setup a dual drive configuration like a Fusion Drive. So you have a HDD drive and now you need to add in the SSD using this Flex cable for a solid state drive (SSD) for the Mac Mini following this guide Mac mini Late 2014 PCIe SSD Cable Replacement then you need the SSD [linked product missing or disabled: IF123-123-1] you only need the smaller 240 GB drive. At this point you have the needed hardware and if you’ve got it all installed you’ll need to run Disk Utility to format the SSD and lastly convert your SSD & HDD into a Fusion Drive following this How to make your own Fusion Drive
My mini came with just a 256GB SSD. I’d like to add 1TB HDD. And make it a Fusion setup. Does the 2014 SSD-only version have the HDD connector already?