1. On the bottom of your Compaq 1200 laptop, find the hard drive door to access the hard drive.
2. Remove the Screws.
3. In this step, you will either need to pry out your Compaq 1200 hard drive caddy, or simply remove the door.
4. Once the Compaq 1200 hard drive is removed the laptop, you need to remove the hard drive caddy. There are usually four screws to remove from the caddy.
5. Simply Insert the new hard drive into the caddy. Place the screws back in. Install your new Compaq 1200 hard drive.