Windows Disk Diagnostic detected a S.M.A.R.T. fault on disk %1 (volumes %2). This disk might fail; back up your computer ...

Windows Disk Diagnostic detected a S.M.A.R.T. fault on disk %1 (volumes %2).  This disk might fail; back up your computer now. All data on the hard disk, including files, documents, pictures, programs, and settings might be lost if your hard disk fails.  To determine if the hard disk needs to be repaired or replaced, contact the manufacturer of your computer.  If you can't back up (for example, you have no CDs or other backup media), you should shut down your computer and restart when you have backup media available.  In the meantime, do not save any critical files to this disk.