This is the software publisher's description.

DriveScrubber can securely wipe all contents of a PC or drive when upgrading to a new computer or new operating system. The wiping procedure ensures that personal information cannot be recovered or misused in any way when discarding, recycling, or selling a computer. Most people think formatting their drive is sufficient to erase all data, but unfortunately, that information can easily be recovered. DriveScrubber can keep people safe from hackers and identity thieves when they part ways with their old PCs or drives before upgrading to Vista.

In addition to erasing hard drives, DriveScrubber incorporates a new feature that can be used to regularly wipe the free space of a drive. This process permanently erases all traces of previously deleted data that still remain on the hard drive, while keeping the existing programs, files, and operating system intact.

Other important uses for DriveScrubber include recovering from system corruption or a disaster stemming from virus or spyware infection. DriveScrubber allows users to completely wipe all remnants of stubborn malware that antivirus or anti-spyware programs may not be able to touch. This process brings the PC’s drives to like-new condition before reinstalling the operating system and any pre-existing programs.

Note that the download here is merely a stub which will download the latest version from the Iolo website.