The battery is find I think. I know some laptops have an ability to refresh laptop batteries but I'm not sure about the Dell D600. If you know of a 3rd party boot utility or something something cool I could try that... or I could just use a voltage meter.
I also found that my laptop is looking it's metallic luster finish and just the over all structure is deteriorating. I think what also contributes to the hd problem is how I grab it when it's on. Sometimes when I'm moving around for a signal, to the couch, bed room, or just holding it waiting for it to shutdown/sleep, I tend to grab it by one hand (I'm right handed) on the right side of the laptop. This is also where the spinning hard drive is. So might be applying pressure in the wrong location. What do you think?



