I know in times past that installing the Mac OS from scratch had a habit of creating a 'fusion' drive if you had both a SSD and HDD in the same box and this could create some odd disk errors down the line.
I currently have Catalina (10.15.7) on a Late 2012 Mac Mini with two SSDs in it (250Gb + 1Tb SSD) and I could really do with more space. I could go out and buy a new SSD but tin drives are still cheaper (£70 vs £160 for 2TB) and as this is for archive and music files speedy access is not needed on this drive. Also the 250Gb drive is a full dismantle (again) so I really only want to do it once more on this Mac. Next time it becomes a 4Tb NAS box :-)
I've seen odd posts about 'core storage' and have a Mac that Disk Utils will not run due to 'core storage' issues but cannot see a simple (ha-ha) explanation of the AFPS / Core Storage file types and its been 3 O/S versions since I messed with multiple types of disk.
I also know you used to be able to 'un-Fusion' a drive with
diskutil resetFusion and going by this support entry I think it sill exists but it seams daft to have it created and then destroy it (time if nothing else).
So two bits of advice please:
- Is there is a way to avoid the old 'fusion' issue on a clean Catalina install with a SSD and HDD in a Mac Mini?
- Where can I find details on Apples newer storage as DuckDuckGo fails me?