‘Free fall’ produces {HEAD ~ a change} in {TAIL ~ the force}, i.e. acceleration, of gravity as perceived in the frame of reference in which the data storage device is at rest 
in
‘ Free fall ’ produces { HEAD ~ a change } in { TAIL ~ the force } , i.e. acceleration , of gravity as perceived in the frame of reference in which the data storage device is at rest
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH