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