yes you can easily remove the drive from the hard disk enclosure and install it inside your computer. You do not need to format the drive to install windows on it.
Hey. Thanks for responding. I have Windows installed on my SSD drive I just want to make sure all my movies and music that's on my 2TB external will be safe if i remove it and put it in my case. I don't need to format it or anything? Is it pretty much just a plug and play?