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