it does not matter that the other is active your mbr always goes to the drive that contains it,for all bootable op.systems usually C
if you have half a dozen op.ssystems installed you will get a boot screen with a choice of which one you wish to boot from
in this case you would set one as the default to which it would automatically boot into unless you wanted one of the others
then you would select it on the screen when it came up
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