Every drive in a Lap-top, MacBook will go bad over time. I used to have a stack of five bad drives on my desk from the last 6 years! With apps. like Final-Cut and PS they will die sooner or later. I cant wait 'till they come out with flash drives in the MacBooks pro.

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1979 Black on Black, 300CD (sold), 1990 Black 300SE, Silver 1989 Volvo 780, 1988 300CE (vanished by the hands of a girlfriend), 1992 300CE (Rescue).