Apple- Sudden
Motion Sensor technology
All MacBook and MacBook
Pro computers, PowerBook G4 computers starting with PowerBook G4
(12-inch 1.5GHz), PowerBook G4 (15-inch 1.67/1.5GHz), and PowerBook
G4 (17-inch 1.67GHz) and iBook computers starting with iBook G4 (Mid
2005) have Sudden Motion Sensor technology, built-in protection for
the hard disk that is designed to help prevent disk failures if the
computer is dropped or undergoes severe vibration. The Sudden Motion
Sensor is designed to detect unusually strong vibrations, sudden
changes in position or accelerated movement. If the computer is
dropped, the Sudden Motion Sensor instantly parks the hard drive
heads to help reduce the risk of damage to the hard drive on impact.
When the Sudden Motion Sensor senses that the PowerBook position is
once again stable, it unlocks the hard drive heads, and you are up
and running within seconds.
In general, Sudden Motion Sensor
protection does not change hard disk performance with regular
PowerBook, MacBook or MacBook Pro operation.
Occasionally, the Sudden Motion Sensor may be activated by unusually
strong vibrations at a time when your PowerBook is writing data
intensively, such as when recording video or audio. Should you
experience dropped frames or sound elements in such a situation,
make sure that your PowerBook is in a stable environment without
vibration or abrupt movement.
(Note that in some locations you
may see the Sudden Motion Sensor referred to as the Mobile Motion
Module. Both names refer to the same
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