On Wed, 5 Dec 2018 19:58:51 +0100, Carlos E.R. wrote:

> Wait, the photo you posted is very different from your text above. It
> displays:
>
>  o Ubuntu
>  o Advanced options for Ubuntu
>  o Memory test
>  o Windows 10 (on /dev/sda1)
>  o Windows 10 (on /dev/sdb1)
>  o Windows 10 (on /dev/sdc1)
>
> Those are three different disks, the first partition of each one.

Mea culpa.
The pictures are correct.
My transcription was wrong.

The correction is sda1, sdb1, & sdc1, each of which is it's own HDD.

The only working Windows is HDD3 on sda1 (SATA1):


The other two Windows got corrupted (one by MS, the other by me):
 

Trial and error shows HDD3 to be "WDC WD10EZEX":
 

Where HDD3 was already set up in the BIOS to boot first:
 

What "seems" to be happening is:
o Disconnecting HDD2 & HDD3, Windows boots from HDD3.
o Connecting HDD2 & HDD3, Grub on either HDD2 or HDD3 takes over!

There is a good Ubuntu (an older version) on either HDD2 or HDD3.
That's likely where Grub is coming from.

I'll respond to the rest separately as I wanted to make this correction.

--- SoupGate-Win32 v1.05