It’s great to see you in the community again! I’m sorry to hear you’re running into issues with Roon seeing your external HD. Since a few days have passed, I wanted to check in on this thread to see if you were still experiencing this issue?
Both @ged_hickman1 and @wklie are steering you in the right direction with the next steps. Outside of this, has anything changed in your setup recently? Or, did your windows core have any auto-updates?