Like an airbag's sensor, it can detect sudden changes in motion and temporarily stop the hard drive to help protect your valuable data from some crashes that could occur due to everyday notebook accidents.
The Active Protection System (APS), available on many ThinkPad® notebook models, employs airbag-like technology to protect the hard drive. The system has an integrated motion sensor that continuously monitors the movement of the notebook, and, if a sudden change in motion is detected, it temporarily stops the hard drive to protect it from a potential crash.
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