I have a new Mac mini that Started out with two system Disks:
This morning I booted and there was nothing in Library folder. I noticed there is a new system disk. so now I have:
What is going on?????
Mac mini 2018 or later
There has been some corruption in the way Catalina was installed.
You will have to erase the whole disk and recover your data and it will depend on how your data is currently backed up.
look at
https://support.apple.com/en-us/HT204904
and note the Time Machine method if you use TM
make at least two backups by different methods to make sure your precious media and documents are safe
If you erase and reinstall Catalina with out removing the "Macintosh DD - Data" partition. You will wind up with a duplicate Data partition.
Why do I have 3 system disks?
