If you recently tried installing a 3TB Hard Drive on an NVIDIA nForce motherboard you'll notice that only about 1/3 of the drive is recognized by Windows. The fix is quite simple:
2. Install the NVIDIA NFORCE 15.58 drivers and reboot your system after the install is done.
3. You're done. Your PC should be able to see the entire 3TB drive (it should be around 2.72TB)