I recently purchased a 500gb Samsung Sata Hard Drive – Model # 501LJ for my Dell Dimension E521. I have enabled the hard drive in the Bios. I now have a 320gb drive on SATA 0 and the new 500gb drive on Sata 1. My DVD sits on SATA 2. SATA 3 is empty. I can see the hard drive in Computer Management, but I cannot select it to format the drive. All suggestions welcome. Thanks