Could I have been that blind?
I’ve used have a section in the MoBo boot menu (all, in my case, hit by hitting <Esc> during first boot.)
I'd gone into the set-up time and again, no way there, but Esc?
Well, yes...the message was well into the subliminal range. Esc. What did we do in the old days? Ah, yes, Pause. The pristine button pressed for the first time, having allowed the Post messages to be displayed during start.
A hurried physical re-installation of the old drive and sure enough, there were the drives listed on the DOS-like screen. Selected the old Samsung.
The system detected the new drive...didn't want that, so back to F1 and stop Plug and Play for a while. Off again. Sure enough the old computer was back...but the drive order was chaotic. However, it was seeable, and data could be copied. Furthermore, the drive would be kept up to date and returned to its prime status if anything went wrong. Okay, first test workable-ish.
Now the new much faster drive. Booted in a tenth the time even though it's getting fairly burdened with stuff. Proves the need to purify the old drive with a re-installation perhaps.
This time the three logical drives are in order -- don't know why, but Pheeew! (Maybe it's because I changed them within Storage Disc Management some time ago.) Then the DVD and CD then the old drive and its Restore partition then the (largely unwanted ) card readers. Perfect!
So, the new disc is in logical order and when it's the old disc's turn - scattered, but usable. Now, do I dare strip the old and try to force the disc order where I want it? Some other time.
Not having the Barracuda strapped agains the front grill is showing temp change from 37 to 45 c So, need to get going on a proper installation sharpish.