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