Urgghh... I started to wade into that (link). Looks useful. Quite the bit of tech to try to absorb after ~5 hours sleep...
(I don’t drink coffee — Diet Sundrop @ 6 a.m.???)
Thanks - will try to puzzle it out. Can my machine support Legacy +UEFI/CMS boot by enabling the CSM (Compatibility Support Module) in BIOS support? Urgghh...
(Was intending to keep a copy of the OS on the “DATA Disk” in case my hopefully soon to be M.2 boot drive fails at some point. Did this on my old “primary” machine and it was a big help — that one’s C-drive crunched* during a Windows update. So I simply disconnected it and then the data drive (still with the OS on it) automatically became my boot drive too. Later when I had time I installed a new / larger SSD where the boot SSD had been & cloned the OS & programs back over to it.
*I also later reformatted that old 128 GB SSD and it actually tests just fine - I now use it as a “downloads only” drive in another machine.)