When {HEAD ~ a request} to write the predetermined data to the page again is received, the predetermined data is written to {TAIL ~ an empty free page} in the log block 
When { HEAD ~ a request } to write the predetermined data to the page again is received , the predetermined data is written to { TAIL ~ an empty free page } in the log block
OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH