I'm using a Powerbook G4 12" (1.33ghz/1.25gbRAM/80gigHD/Tiger10.4.7).
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recently when on a cleaning/utilities kick. I ran Onyx, repaired permisions, ran DiscWarrior, ran SpeedTools, etc.
SpeedTools told me that there are a lot of trashed sectors on my harddrive. It would have taken hours...