The hard drives in aluminum PowerBooks, older MacBook Pros, and virtually every other Apple laptop except the MacBooks and unibody MacBook Pros are not user-serviceable.
They aren't easy to get to: it takes a couple hours and ~50 screws to swap the drive in my 12" Powerbook — but it doesn't violate the warranty to do so.
They probably wouldn't have covered it if you obviously fucked it up while taking it apart, but there was never anti-tamper tape or anything in there to directly detect that you'd done so.
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The hard drives in aluminum PowerBooks, older MacBook Pros, and virtually every other Apple laptop except the MacBooks and unibody MacBook Pros are not user-serviceable.
They aren't easy to get to: it takes a couple hours and ~50 screws to swap the drive in my 12" Powerbook — but it doesn't violate the warranty to do so.
They probably wouldn't have covered it if you obviously fucked it up while taking it apart, but there was never anti-tamper tape or anything in there to directly detect that you'd done so.