missing data volume after adding Catalina on external hard drive
To start I cannot find where I update my device info. Things changes a bit on the forums?
OK. I have a backup plan and this particular external disk is not used in it. I have a few other external hard drives with "just in case" MacOS on (Mojave) and time machine that manage my backups.
I have a particular external hard drive that I just keep Apple films on. I decided to add Catalina to it as my main drive (iMac 2013 1TB fusion) is showing potential issues, running up to date Catalina. More adding another start up option than anything else.
The volume already contained info, I added Catalina to the external hard drive via the Apple installer and now have two APFS volumes on that single external drive, one that is visible directly to the OS, with Catalina. The other volume is not visible to the OS directly but is via disk utility or Carbon Copy Cloner or Apple TV app, this non visible volume has a tag diskname-Data and contains the films.
I have unlimited ISP, would it be easier to re format and start again then re download films or is there a quick fix to tidy this up?
Thanks in advance.
iMac 21.5″, macOS 10.15