{HEAD ~ Portion} of data stream or data block 200 is to be stored in storage device 210, representing {TAIL ~ a storage device} of a storage system  
{ HEAD ~ Portion } of data stream or data block 200 is to be stored in storage device 210 , representing { TAIL ~ a storage device } of a storage system
HEAD HEAD HEAD HEAD HEAD 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