I used this Geek Tool yesterday to determine whether to replace a hard drive in a desktop. I ran SeaTools in SAFE MODE and all the scan tools gave the hard drive a PASS, which saved hours of time. No need to replace the hard drive and re-install the OS and applications.
SeaTools is a comprehensive, easy-to-use diagnostic tool that helps you quickly determine the condition of the disk drive in your external hard drive, desktop or laptop computer. It includes several tests that will examine the physical media on your Seagate or Maxtor disk drive and any other non-Seagate disk drive.
Try it for yourself the next time you have a hard drive issue.