System User _Unknown

While similar to previous threads ... I've encountered a different flavor of issue with the _unknown user.
It has appeared this week exclusively (all other folders appear correct) at the top level, Macintosh HD drive. This isn't a traditional folder, rather an actual hardware device. get info shows users: [ _unknown, admin, everyone ]. Discovery came when I was unable to create a new folder on the first level of that drive. admin permissions had changed to read; _unknown had read/write. I changed admin to read/write and solved the symptom ... the problem remains. I've run permissions repair, rebooted ... all the usual stuff.
I believe the _unknown has replaced System. I hesitate, knowing little about Unix architecture and because it is the system hard drive, to try something like chown.

I may just be stupid but:
I have followed at least a dozen of these discussions. There is a server involved or all files and folders are affected or _unknown shows up as a user in sharing or accounts system Preference panes.
None of the symptoms match mine. And, in every case I read, it is a user account/group NOT SYSTEM that has been replaced by _unknown.
The hard drive is a non-standard folder and System is a non-standard user. These are my concerns.

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