Run CHKDSK (no repair function) on the Disk that contains the corrupt file....

If you receive these errors:

/* WARNING! F parameter not specified.

Running CHKDSK in read-only mode.

CHKDSK is verifying files (stage 1 of 3)...

6176 file records processed.

File verification completed.

133 large file records processed.

0 bad file records processed.

0 EA records processed.

0 reparse records processed.

CHKDSK is verifying indexes (stage 2 of 3)...

13853 index entries processed.

Index verification completed.

Errors found. CHKDSK cannot continue in read-only mode. */

Then you have an NTFS problem (these errors can be found on a local or SAN storage). You can try and fix the error by shutting down SQL and running chkdsk with automatic fix or allocate new Disks and restore your databases.

Hope this helps,

David