wherein {TAIL ~ the voltage differential} between the negative stylus voltage and ground is greater than a threshold voltage for rotating a rotatable element in {HEAD ~ the electric writable medium}, 
wherein { TAIL ~ the voltage differential } between the negative stylus voltage and ground is greater than a threshold voltage for rotating a rotatable element in { HEAD ~ the electric writable medium } ,
OTH TAIL 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 HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH