Sometimes the hard drive is corrupt, or you want to install a new one. This guide will show you how to take out a hard drive and replace.
Lay laptop on it's face and remove the two #1 Phillips screws in the back of the black plastic panel with a raised center.
Carefully lift the panel using the thumb slot on the side closest to you while the battery is pointed out.
After lifting the cover up carefully, slide it to the left to be removed.
Place two fingers gently on the hard drive.
Slide it back to the left.
Lift the drive by the two corner tabs making sure not to touch the metel