Information recording method and apparatus

Abstract

An information recording method for recording information on a rewritable recording medium including the steps of recording synchronizing signal information in a synchronizing signal portion on the rewritable recording medium and recording data information in a data portion of the rewritable recording medium after the synchronizing signal portion by forming marks in the data portion, wherein the marks for particular areas of the medium are different in a physical property from other areas of the medium so as to record data information in association with both ends of each of the marks. Upon rewriting of at least the recorded synchronizing signal information, a length of the synchronizing signal portion changes and a start position of the synchronizing signal portion changes, and wherein a change of the synchronizing signal information start position is smaller than a change of the length of the synchronizing signal portion.

Dependencies are inferred from the claim text.