I've been getting a warning box in apps like iMovie and Garage Band when I try to record voice that says the disc is too slow. Seem like it shouldn't be. Is there something that could be slowing it down? I'm running 10.4.3 on a 1.25 GHz Al Powerbook with a gig of ram. It has an 80 gig disc with about 50 used. TIA. Peter