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