"nospam"<firstname.lastname@example.org> wrote | stop guessing. what does smart say? | I'm not guessing. SMART says okey dokey. The WD diagnostic tool says bad disk. As far as I can tell, SMART is not a terribly useful development. To clarify: The disk was made by WD. I ran low-level diagnostics with their own tool. If there's a more dependable test than that I don't know what it is.