One of my hard drives has been giving me problems and causing blue screens and hangs. So I decided to run a few tests and one of them found tons of "lost clusters" and eventually reported "Too many errors, terminating..." It said I should run chkdsk to fix the errors, but chkdsk doesn't find anything or attempt to fix any errors. I've backed up the data and all, so how can I get rid of these lost clusters and fix the hard drive? It doesn't matter if I lose the data.