What is the best way to use a belt sander for hardwood floors?

To use a belt sander for hardwood floors, start with a coarse grit sandpaper to remove old finish and imperfections. Work in the direction of the wood grain, moving the sander slowly and evenly. Gradually switch to finer grit sandpaper for a smooth finish. Vacuum or sweep the floor between sanding passes to remove dust. Finish with a floor sander or hand sanding for corners and edges.