from apple.com/powerbook Takes the Fall Now every PowerBook G4 is equipped with Apple's Sudden Motion Sensor to help protect your most valuable asset: your data. The Sudden Motion Sensor senses change in axis position and accelerated movement. In the event of a drop or fall, the Sudden Motion Sensor instantly parks the hard drive heads so they won’t scratch the disks on impact, lessening the risk of damage and improving your chances of retrieving valuable data. When the Sudden Motion Sensor senses your PowerBook is once again level, it unlocks the hard drive heads automatically.
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Takes the Fall
Now every PowerBook G4 is equipped with Apple's Sudden Motion Sensor to help protect your most valuable asset: your data. The Sudden Motion Sensor senses change in axis position and accelerated movement. In the event of a drop or fall, the Sudden Motion Sensor instantly parks the hard drive heads so they won’t scratch the disks on impact, lessening the risk of damage and improving your chances of retrieving valuable data. When the Sudden Motion Sensor senses your PowerBook is once again level, it unlocks the hard drive heads automatically.
That is OMG SO COOL!!! I want that one!!!