Each disk is positioned tangent to the surface of {HEAD ~ an AGA chip} in {TAIL ~ a specific orientation} 
Each disk is positioned tangent to the surface of { HEAD ~ an AGA chip } in { TAIL ~ a specific orientation }
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL