The ThinkCentre has one blue and one black, as in the 2nd photo here.
https://en.wikipedia.org/wiki/USB#System_design
> * With the adapter labeled USB 2.0, why is plugging in USB 3 necessary
> to boot the external system?
From: David Wright <deb...@lionunicorn.co.uk>
Date: Sun, 3 Nov 2024 22:43:19 -0600
Who knows. You've got, what, a SATA disk connected to an adapter ...
Correct.
> ... is the hub separate?
Yes. The hub is only for keyboard, mouse and charging a phone or
camera.
Anyway, are all these connectors in good condition?
I'd need to investigate. With the setup working now, examination of
connectors is a low priority.
I've got, or had, computers with USB ports that don't work with, or
boot from, certain sticks, and computers that only boot from sticks in
certain ports. It's par for the course.
OK, thanks.
> Maintainers may need feedback about what and where [grub2 doc] needs
> attention.
Added to my list.
... P.
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