Connect your N900 via USB with a (uhh, shiver) Windows computer and right-click the new drive appearing in Windows explorer. Choose tab tools and click 'correct/repair' (or similar named). Before removing USB disconnect clean. That's it. Else you may search on this forum for michaaa and its wonderful and at least thousand times posted explanations/commands how to handle such situatuon directly via x-terminal shell on N900 itself! spoonfeeding