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