That being said I haven’t installed Mojave on anything yet. You will likely have to change things to Mojave, but I don’t see why it wouldn’t work. I would imagine it’s Mojave trying to convert the disk to apfs because it’s suppose to support HDD eventually, but as far as I know it’s corky. 16gb Ram For Mac Mini 2012 4,4/5 9349 votesĮdit added I feel like this has to do with apfs You can try disabling apfs or waking it install as jhfs or whatever it is.