If you know you are having disk errors, you need to replace it. (If you don't feel comfortable replacing the disk, any computer repair place can do it.) There is an access door on the bottom right where the noise comes from. You should be able to use most any 2 1/2" laptop drive. You will need to make sure the jumper is set for master. (Many replacement drives come as cable select.) You will also need to remove the old drive from its caddy and reuse it with the new drive. The final step is running the install from your recovery CDs. I have personally had the best luck with replacement drives from Toshiba or Hitachi. Your machine originally came with a 40GB drive. If you need more space, this is a good time to do it. I think your machine came with a 4200RPM drive, but I'm not sure. They are available 4200RPM, 5400RPM or 7200RPM. Faster is better, up to a point, but more speed can equal more heat. My opinion is that the 5400RPM rrives give the best combination or price and performance, but others would say faster is better. I also think that the 80 GB drives are the best value, but others would say to buy the biggest drive and others would say that you should get exactly what you have if you don't need more space. You should be able to find a 80GB 5400RPM drive for under $100 if you buy it online. If you taske it to a service place, I would expect that your cost would be double that figure.