Dual boot Win/Lin on separate HDs with a switch - bypass Grub?

[firenice03]

[quote author=m654321 link=topic=6639.msg48321#msg48321 date=1565982493]...So, why don't you keep your dual-boot system on a single drive (keep it as /dev/sda) instead of the two OS on two different drives? That way I think your back-up drive will always be /dev/sdb whether it's switched on or not...

Kinda funny you mentioned that.  Actually I just broke my external drive OUT of its' box so that I could mount it internally and run it off the switch (LOL)!  (Wanted to clear away some of the stuff around my PC and had already ordered the switch, so I decided internal was the way to go.

I'm not sure if I tried it yet, but in my mind, if I set the Boot order to:
1) Windows HD
2) Grub
3)Linux HD

Then if the Windows HD is not present (turned OFF) it should move on to the next HD which would be the Grub partition.  I will test it this evening.
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Going to throw out a MAYBE...
Is this UEFI??  - Probably not and may not work in same fashion..
But on my kangaroo - I have Windows on the internal and LL running from a SDcard.
If I have "ubuntu" selected in uefi bios - I get normal grub...
If I set windows boot manager I will only get windows normal boot process....

Might be kinda what you'd want but system may not be....