When {TAIL ~ the sensor} senses {HEAD ~ a change} in gravitational or inertial acceleration of said data processing system, it alerts system electronics to temporarily park a read/write head in a safe position 
When { TAIL ~ the sensor } senses { HEAD ~ a change } in gravitational or inertial acceleration of said data processing system , it alerts system electronics to temporarily park a read / write head in a safe position
OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH