Good Morning/Afternoon/Evening guys. I need help with some PC issues. I'm considering to buy a new HDD for my desktop and was wondering if I could use my old HDD as an extra hard disk without reformatting it leaving the OS and everything it contains while installing a new OS on the new HDD. I'll use the new HDD as first boot and I was wondering if there would be any problems by having 2 operating systems installed on both HDD's. And if so, how can I use the old drive as slave without reformatting the entire drive to save all my files.