In the example shown, portion of {TAIL ~ data stream} or {HEAD ~ data block} 200 is received by a data storage system  
In the example shown , portion of { TAIL ~ data stream } or { HEAD ~ data block } 200 is received by a data storage system
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH