If you want to install a larger hard drive or if your hard drive isn't working, consider the steps in this guide to remove your current drive.
Flip your computer over, so that the underside of your computer is facing upward.
Locate the hard drive casing on the bottom-right corner of your flipped computer.
Remove the two 3.8mm screws with your Phillips #00 Screwdriver and carefully lift up and remove the hard drive casing.
After you lift off the hard drive casing, using your Phillips #000 Screwdriver, remove the two 3.6mm screws located on the right side of the hard drive.
Using your fingers, carefully lift the lower right corner of your hard drive until it is removed from its housing.