The scan disk utility has the following feature.
a) Check media surface and remove bad block.
b) Find lost file fragments.
c) Check files and folders for error.
d) Fix cross linked files.
e) Check for invalid file name.
f) Check for invalid date and time.
g) Check for duplicate name.
Scan disk is a Microsoft disk repair utility that was replaced by Check Disk in window 2000 and window XP.