Check Disk detects disk integrity errors and fixes them. Match the types of errors Check Disk detects and fixes with the error descriptions.
1) A series of used clusters on the hard disk drive that are not associated with a specific file.
2) Occurs when two files claim the same cluster.
3) Files that exist on the hard drive but which are not associated with a directory in the index.
4) A portion of the hard disk that cannot be used.