External HDDs not showing up on Mac mini

Hi there,
I have an old Mac mini with several external HDs: one Drobo drive and three other drives of various sizes. All are connected to the computer via USB: two directly, and two plugged into the other drives.
Recently, a couple of the drives stopped appearing on the desktop. They are turned on, and I haven't changed anything on the system, but the drives in question don't show up.
Any suggestions?
Thanks!

Hi Tor Lundgren-
Is it always the same two drives that stop responding?
Are you able to connect all of them directly to the Mac via a USB hub just to see if you can narrow things down?
This document may also be helpful: USB Device Troubleshooting
Luck-
-DP

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