I just bought a new pc (http://www.newegg.com/Product/Product.aspx?Item=N82E16883220509) and it was listed as having a 1TB hard drive. But my C: drive is only 149Gb. Strangely, there is a D: drive that has 764GB free, but absolutely nothing on it. Is this the rest of the hard drive? Can someone explain how the hell this works.