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