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