New
#21
Bios will pick up the first active partition it sees.
You have an active partition on all 3 disks.
You can add both OS entries to all of them.
If you are booted into Disk1:
Find the drive letter of your windows partition on Disk3. It might be Z for example.
open admin cmd prompt and type:
bcdboot z:\windows
Then type
bcdboot c:\windows /s z: