One of the most common computer problems I see people facing is a faulty or corrupted hard disk drive. In many cases, the solution to the problem is a reboot, and the OS automagically runs a utility like Windows's chkdsk that repairs the errors. Sometimes, the problem is a bit more severe than that and more drastic measures are required. Most people I've encountered were unnecessarily afraid of running any kind of tool to scan and repair their hard drive. But it doesn't have to be all horror and blood and gore: with a little knowledge and a few specialized bits of software, you too can be a genuine Disk Doctor!