Fix Hard Drive

Chkdsk (Chkdsk.exe) is a command-line tool that checks volumes on your hard disk drive for problems. The tool then tries to repair any problems that it finds. For example, Chkdsk can repair problems related to bad sectors, lost clusters, cross-linked files, and directory errors. To use Chkdsk, you must log on as an administrator or as a member of the Administrators group.

The chkdsk command is a Recovery Console command used to check a specified disk and repair or recover data on the drive if necessary.
Chkdsk also marks any damaged or malfunctioning sectors on the hard drive or disk as "bad" and recovers any information still intact.