Timing recovery in the read channel synchronizes to a phase and {HEAD ~ frequency} of {TAIL ~ the preamble field} and a sync detector detects the sync mark in order to frame operation of an RLL decoder for decoding the detected data field 
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Timing recovery in the read channel synchronizes to a phase and { HEAD ~ frequency } of { TAIL ~ the preamble field } and a sync detector detects the sync mark in order to frame operation of an RLL decoder for decoding the detected data field
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH