EXTERNAL HARD DRIVE DISPLAYS TWICE IN FINDER - RECENT OCCURRENCE THAT WILL NOT GO AWAY

“EXTERNAL HARD DRIVE DISPLAYS TWICE IN FINDER - RECENT OCCURRENCE THAT WILL NOT GO AWAY: […]This never happened until recently.[…]”

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Report this to Apple:

Did this Occur After a Particular Change?:

It may be a bug in an update. So. If your recently made a change to your macOS (ie update or user creation), then you should report this to Apple:

Do your Part: Inform Apple of your feedback of this issue. Include how you’ve troubleshot this, and your results. Apple wont get back to you directly, but the more feedback they receive from its users, the more likely they will know what needs to be fixed, and what their customers prefer in updates, and future macOS versions to come.

1. Go Here: Feedback - macOS - Apple
2. Select: "Bug Report" for the "Feedback Type"
3. Select: "Software/Firmware Update" for the "Feedback Area"
4. Comment: that is all occurred after installing an update, and how you have troubleshot this this far. Include the URL of this thread.
5. Proceed from there as necessary

Start up in Safe Mode, and check again: Start up your Mac in safe mode - Apple Support

Which hard disk and vendor?

Is there any dock or hub or other (USB?) gear connected?

That happens consistently to me too.

So far, I've found no effective fix. My workaround is to right click one of the drives and select "Remove from Sidebar". If it ever becomes a real problem with the OS, I'll deal with that at that time. It's been like this for months and my 2020 27" iMac performs beautifully

At this point it's appears to be little more than a display anomaly.

It's just not a big deal to me. A bit like billboards I pass as I drive ... learned to ignore them too.