Pre-APFS OS on a APFS drive?
I’ve been trying to understand how the new APFS formatting works, but I’m afraid it’s got my mind blown. So please forgive the immediate resort to asking what is probably a simple question here.
SHORT VERSION: Can I take a drive that is already formatted APFS with Catalina, partition it, and install El Capitan or Sierra on the new partition?
LONG VERSION: I recently got a used 2014 Mini so I could run some legacy software. It came pre-installed with Catalina, and I want to keep it for those times I need a (relatively) modern OS.
But I need to also run either El Capitan or Sierra on this machine for some older audio software.
If it’s possible, I’d like to partition the existing internal drive. But I don’t know if one can keep a drive formatted for APFS and install an older pre-APFS operating system on it.
If not, I’ll get myself a blade SSD as a second physical drive, but for the time being I’d like to skip the expense.
Thanks in advance and going forward for all replies.