I just bought a new HDD. I'm trying to figure out how I can duel boot a OS from the first HDD and a OS from the new HDD at the same time. I've seen this done before on a youtube video from way back. I can't find it though, so basically I want to have two OS running live at the same time. If any one knows what this is called or any information, that would be great.
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It's impossible. You can run two OS's in virtual machines, but that's the only way to do it.