For motherboard to detect two OS system properly, it will be better by install the OS on each hard drive seperately. Otherwise, the boot sector might go to C drive and second OS might not be able recognize properly. At beginning, install first OS on first hard drive, do not connect second hard drive on system. After finish installation OS and drivers, then shut down system and remove first hard drive. Then connect second hard drive on system to install second OS. After finish OS and driver installation, then shut down the system and connect back the first hard drive back to system. At start up, press F9 key on boot screen to select first or second hard drive. System will be able to boot into selected OS properly.
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