Mmmm, try to force it to dma mode, and restart the pc. dma mode is the option to get, it means direct-memory-acces and is really needed for fast data streaming. One other thing (but mostly it is solved by the pio-dma change), could also be the ide-driver, most computermakers add their own, but usually the microsoft ones work better. Might want to check your dual channel ide controller for that. Should be listed next to the primairy and secondairy one. If you need the microsoft one, choose update driver and let windows do a suggestion.