Apple file system experts?

[Mac the Knife]

Any Apple file system experts out there?

I have an Intel macmini with two drives. when I setup computers I usually reserve one SSD for the System and put Data on other drives (SSD2 in this case). Thus with this one, until someone unplugged it without warning. Black screen.....

By hook and by crook I got it working again, reinstalled Catalina, reinstalled from Time Machine and all looks good except that I have 3 instances of SSD1 and one instance of SSD2.

Some thing some where is mounting something incorrectly.

Any experts?

Mac

[Jhieminga]

Are you seeing this perhaps: https://support.apple.com/en-us/HT210650 ?