SpinRite: This is a disk protection utility.
“….any weak and failing areas within the region are located and removed from use while none of the drive’s original data is being stored there. Only after the region has been made absolutely safe, will the drive’s original data be restored to that area.”
Normally I would consider the verbiage on this page to be hyperbole, but Steve Gibson isn’t just anyone. He wrote Shields Up, and is an awfully smart guy.
One of my favorite items on his site is a long narrative about a DOS attack he was the target of: The Strange Tale of the Denial of Service Attacks Against GRC.com. This thing reads like a science fiction novel: bots massing in chat rooms waiting to attack, 14-year-old kids bringing down Web sites, etc. If you start reading it, you’ll find it hard to stop.