Catalina on an EHD
Running Sierra on a late 2013 iMac. Loaded Catalina on a 1TB Crucial SSD EHD. No real problems switching between OSs. However on Disk Utility the Catalina volume is not on the Crucial EHD, but on Apple APFSMedia. And running First Aid doesn't work on either Catalina volumes. Is this or can this be a problem?
iMac Line (2012 and Later)