CHKDSK and SCANDISK DOS Commands

CHKDSK and SCANDISK are disk-checking utilities. CHKDSK was replaced with SCANDISK in MS-DOS 6.2 and features a Windows graphical user interface. It is much more powerful than CHKDSK.
Where CHKDSK could report or fix lost clusters by referencing the File Allocation Table (FAT), SCANDISK can also repair these errors for compressed and uncompressed discs. SCANDISK can also perform a disc surface scan and automatically fix errors if the user has specified this option.