> it doesn't want to play nice with USB drives.

Ok: I finally found the problem: my test disks all were a portable ones -powered from the USB bus-.
Cause that's what I had around the house.
I know the USB port needs to deliver enough juice to make it work, and I had taken that into account: I had plugged in the power only connector on another USB port, getting more power
if needed.
But apparently that's still not enough power from that server's motherboard. Only after plugging it in on a standalone power supply the drive seems to spin up. (I had not heard it trying to spin up and fail (the server makes way too much noise to ever hear the quite silent drive).

So yeah: 3.9 does support it and I can now order some external 1Tbyte drives to use as backup
medium, they now are cheaper than tape anyway.

Next step will be to figure out how to get dump to fill disks like it can fill tapes, or something somewhat similar. But at least I now have a path out of that corner I found myself in.

Lesson:
- don't assume the drive gets enough power, not even if you plug it in on 2 USB ports

Wishlist:
Error messages telling you something (if that's possible at all to start with).
"I'm giving it all she's got Jim, need more dilithium crystals"

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