When encoding moving images using an encoding scheme in which a termination process is performed, controlling so that a picture to be encoded after a picture whose encoding has been forcibly terminated does not refer to the picture whose encoding has been forcibly terminated. The term a top-loading mechanism means a mechanism for inserting andor ejecting an optical disk via a top surface of the optical disk driver. The areas surrounded by the plurality of the grooves make up a plurality of insular pressure receiving portions independent of each other.