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hello I already have macOS sierra installed on one of my hard drives. since I have more room I was wondering could I just add windows to the hard drive as well. iv read up a little but mostly people who have dual boot set it up in the beginning and I all ready have my mackintosh up and running...

Hello community. I am starting work on my first Hackintosh build. Before I begin, I was wondering if extra hard drives had to be installed before the installation of OSX is complete or if I could add another hard drive say a couple months down the line after the build is up and running??