The present invention provides an antireflection substance such as an antireflection film having a low moisture-permeable characteristic, high quality and high reliability, and also provides a display apparatus comprising this antireflection substance. At least one of the number of bit streams may include an assumed value in place of a value that would be determined by another bit stream. When write current is passed through the current strip heat is generated at the edge of the strip and a magnetic write field is induced at the disk surface.