Have you run Scandisk in Thorough Mode? - scanning the whole disk for
errors?

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Noel Paton (MS-MVP 2002-2004, Win9x)
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> scan disk says no errors but defrag says can't defrag as
> there are errors on drive - run scandisk. i have run scan
> disk repeatedly and still keep getting same message. i
> have done full system scan, ensured no other programs
> trying to write to disk and still have the same problem.
> any suggestions?