A storage medium may be coupled to a processor such that {HEAD ~ the processor} can read {TAIL ~ information} from, and write information to, the storage medium 
read
A storage medium may be coupled to a processor such that { HEAD ~ the processor } can read { TAIL ~ information } from , and write information to , the storage medium
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH