Microsoft ScanDisk
ScanDisk is a utility in MS-DOS and Microsoft Windows systems which checks and repairs file systems and bad clusters on the hard drive. It was introduced in MS-DOS version 6.2. Previous versions of MS-DOS supplied only the simpler, purely text-based program chkdsk . In Windows 95 onwards, SCANDISK also had a graphical user interface, although the text interface continued to be available for use in single-tasking ("DOS") mode. SCANDISK can't check NTFS disk drives and therefore isn't available for computers running NT based (including Windows 2000, Windows XP, etc.) versions of Windows: a newer CHKDSK is provided instead (not to be confused with the older MS-DOS CHKDSK).
