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#21
For some reason when I tried to install WIN10 on a separate drive from 8.1 and 7, I got an error message. To workaround that error message, I disconnected all drives with an OS installed and then installed WIN10. I then connected the drives with 8.1 and 7, when it is boot time I enter my BIOS and change the drive with the boot manager installed for the OS I want to boot. I now have 2 WIN10 (current build and previous) and WIN8.1 and everybody is fat and happy.
Harold