When the bit map data is not compressed, {HEAD ~ an extra character} is registered into {TAIL ~ a predetermined area} of a storage 
is registered into
When the bit map data is not compressed , { HEAD ~ an extra character } is registered into { TAIL ~ a predetermined area } of a storage
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH