Run Check Disk from a Command Line to Check for and fix Disk Errors
You should periodically use the Check Disk tool to check the integrity of disks. Check Disk examines disks and can correct many types of common errors on FAT16, FAT32, and NTFS drives. One of the ways Check Disk locates errors is by comparing the vol¬ume bitmap with the disk sectors assigned to files in the file system. Check Disk can’t repair corrupted data within files that appear to be structurally intact, however. You can run Check Disk from the command line or through a graphical interface.