Configuration to manage 2 different OS in 2 different HDD

[Sxino]

I bought a second HDD and installed Win 10.
From BIOS i choosed to boot the recent HDD but it loaded my old HDD (with Win 7).
When Win7 loaded, it was installing the controller to the new HDD as a device like a flash drive.
I cannot boot the new HDD even desconnecting the old HDD (shows black screen)

Does it needs any configuration to manage different HDD with different OS?

 

[nobspls]

If you really want to use the BIOS to switch between booting the different OS, you need to install each OS on their own drive, without the other one connected in. You do NOT want Microsoft detecting the other drive and putting stuff into the NTloader into the other drive and not marking the drive as bootable.

 

[Sxino]

If you really want to use the BIOS to switch between booting the different OS, you need to install each OS on their own drive, without the other one connected in. You do NOT want Microsoft detecting the other drive and putting stuff into the NTloader into the other drive and not marking the drive as bootable.

The solution is to disconnect the older HDD and leave only the new one which i want to install Win 10 as you said.
I think it is necessary because when you are in the part of selecting the device to install the OS, it creates a partition for "System" and one for "Main", so it detects it as an independent device.(and not like a flash drive or external storage)

Thanks for the solution