Turn the laptop so the battery-side of the laptop is farthest from you. Locate the captive screw pictured here and loosen the screw using the #1 Phillips screwdriver.

You may want to ground yourself before attempting to touch any components. This means touching a conductive metal to eliminate any static buildup in your body, which can damage computer components.

Make sure your new hard disk is compatible with your device before attempting to install it because it may not fit, may have different wiring, etc.