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.

a. Lost clusters
b. Cross-linked file
c. Orphaned files
d. Bad sector