I have a Dell workstation (xeon mpu) with dual 1 TB HDDs... Win 7 pro is installed on one drive, and the other is blank, newly formated...
I want to be able to boot off either drive... the win 7 HDD, or off the Win 10 HDD. I realize I may have to deal with BIOS boot sequence for now, and later change both drives to Win 10 pro...

When I boot from DVD with Win 10 Pro OEM version, It cannot find either drive... the box is blank... it will see external USB HDDs, but not my SAS drives...

What am I missing?