"DTI Data Recovery is happy to announce the free full version Windows Surface Scanner. This free but powerful software will quickly scan your hard drive and let you know if there are any sector errors. It is critical that all customers thinking about running data recovery software run the Freeware Windows Surface Scanner before choosing their recovery option.
Hours can be saved diagnosing hard drive problems by checking the hard drive for bad sectors. This is the reason DTI Data Recovery is offering this full version freeware utility - Windows Surface Scanner. In some situations it is hard to determine if you will need the services of a data recovery company or if data recovery software is the correct option for you. This tool can help answer those questions.
Windows Surface Scanner Version 2.20
This software will read each sector of a physical drive that is currently mounted on an XP, Vista, or Windows 7 operating system. Each sector is examined for a read error. If a read error occurs the error counter will increment." - Like CHkDsk I guess.