![]() Obviously the Mountain Lion Disk Utility isn't liking the Fusion drive (in its current state at least), which I'm somewhat confused by as it is quite likely the original drive that shipped with this 2012 Mini. For High Sierra and below the procedure is different. Yes as I said above you need to be in the Recovery mode for Catalina as per your thread title as this only works for Mojave and above recovery mode. You can always refer to the Apple web site and compatibility of hardware/OS. I did manage to get Mountain Lion installed on my 2012 Mac Mini as it only has a 128GB SSD and a 1TB HDD (no Fusion drive!). I upgraded said machine to WD Blue 1TB NVMe SSD and the Mavericks Disk Utility does not recognise said hardware and thus can't install the OS. ![]() It was shipped with Mavericks and a 128GB NVMe SSD. ![]() This is an extra complication with Apple OS' vs Microsoft OS and the various Linux flavours. Sorry for the CAPS! Thus if you are employing hardware and/or processes that weren't used when the old OS' were written then those OS won't see the later stuff. Apple DOES NOT SUPPORT BACKWARD COMPATIBILITY. You now have to think! And this is because of the restrictions with the Apple way of doing things. It would be worth your while to read up on disk architecture of the Apple kind if you want to play around. You will have a blank Fusion drive without any partitions let alone any formatting. Quit and then re-open Disk Utility to see the correct disk configuration:Īt this point you have a Fusion Drive formatted as HFS+.Ĭlick to expand.Yes as I said above you need to be in the Recovery mode for Catalina as per your thread title as this only works for Mojave and above recovery mode.Container disk 2 is deleted and the sidebar will show something similar to: At the prompt, enter Macintosh HD for the Name – it will likely be pre-populated with Preboot – and select Mac OS Extended (Journaled) for the Format.Select Container disk 2 in the sidebar and click the Erase icon in the toolbar.The Mac’s startup Fusion Drive should be listed in the Disk Utility sidebar:ġ The disk identifier may be another number. In the top-left corner of Disk Utility, click the View dropdown and select Show All Devices.Having started your Mac in Recovery Mode, open Disk Utility.
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