I just bought a Barracuda 7200.10 320GB and on the label there's a sticker explaining that you can set a jumper to limit the operation to 1.5 Gb/s rather than 3.0 Gb/s and the jumper is preset that way. Why would they slow down their HD's, to keep them colder and more reliable ? Should I remove the jumper and let it rip at 3 Gb/s ?