The base plate 112 and the top cover 114 are {HEAD ~ large surfaces} within {TAIL ~ the disc drive} 100 
The base plate 112 and the top cover 114 are { HEAD ~ large surfaces } within { TAIL ~ the disc drive } 100
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH