So I'm planning on getting a second Hard Drive for my computer for expanding it's storage seeing as how Steam has now taken up over half of my 1TB Hard Drive and was wondering if there was anything I had to know. Do I need to install Windows on the Hard Drive, do I just need to plug it in and format, is there something else all entirely that I have to do that I don't know about? If I have to install Windows on the Hard Drive then does it matter that my disk is an OEM disk?