Link to the thread about the reason I had to move up the transfer to the Win 11 Pro machine, here:
https://freerepublic.com/focus/f-chat/4341085/posts
So far as I can tell (and diagnostics report), the boot drive on the old (Win 10 Pro) machine is fine. The problem THERE is an apparently irreversible conflict in the latest OS update from Microsoft. Eventually, I’ll likely put Linux on that one.
I've lately had problems with Brave on Linux Kubuntu. It's very slow to start and overloads the CPU. I'm using Chromium.