This is because, if the recovery information is sequentially written, {TAIL ~ most recent recovery information} is written to {HEAD ~ a page} located immediately before a free page firstly found in the check point region 
This is because , if the recovery information is sequentially written , { TAIL ~ most recent recovery information } is written to { HEAD ~ a page } located immediately before a free page firstly found in the check point region
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH