WARNING: Before working inside your computer, read the safety information that shipped with your computer. Follow the instructions in Before You Begin.

CAUTION: To avoid electrostatic discharge, ground yourself by using a wrist grounding strap or by periodically touching an unpainted metal surface (such as a connector on your computer).

CAUTION: Hard drives are extremely fragile. Exercise care when handling the hard drive.

Remove the screw that secures the hard-drive assembly to the system board.