I recently backed up, installed Catalina, and decided to go back to Mojave for now. That was an ordeal, but I got it all working again. The only thing different is now I can see the previously hidden Data drive on my desktop and I'd like to hide it. I believe Apple calls it firmlink, to make two drives appear as one. I can't seem to find out how to re-firmlink them? Any suggestions? Thanks.
Not unless you erase the drive first.
You need to erase/format the parent drive to start over when you revert from Catalina.
From Internet Recovery>Disk Utility>View>Show All Device> select the Parent drive
Internet Recovery: https://support.apple.com/en-us/HT204904
Revert your Mac to a previous macOS version - Apple Support
That's what I was afraid of. I really don't want to spend a whole day just for that. I assume that maybe when I upgrade to Catalina that maybe it will fix itself?
OK, not unless I completely format the drive, getting rid of the partitions before installing Catalina - ok, gotcha. Thanks for the info.
You're welcome.
How to re-firmlink Macintosh HD & Macintosh HD - Data drives into one.
