I had a hard drive that was six months old. One day the computer froze and would not respond to anything. When I restarted the computer using the button on the motherboard, the hard drive started making a crackling noise. A Victoria scan of the hard disk revealed bad sectors. Overwriting the sectors did not work. The same bad sector numbers kept appearing with each check. I unplugged the hard drive and put my old hard drive in its place. It worked fine for 2-3 days and started crackling just like the old one.