Let’s say you’ve got Windows 7, and you install a second hard drive. Perhaps you have an SSD as your primary drive, and you want to store your GB’s of MP3s, videos, and documents on your second data drive.
Well, you could just copy the data into a new folder the old fashioned way. Doing this tends to break Windows 7’s “libraries” feature, and suddenly you have to tell Windows where to find all your files. That’s kind of annoying.
Fortunately, there is a built-in feature for moving your My Documents, My Music, My Videos, My Pictures, and even your Downloads folder automagically – and Windows will still keep track of everything for you!