Patent ID: 8149681
Filing Date: 2012-04-03
Classification: G11B

Abstract:
1. A combination type optical disk medium having plural recording layers comprising: a first volume space which is formed for at least two recording layers of the plural recording layers; and a second volume space which is formed for at least one recording layer of the plural recording layers; wherein the at least two recording layers of the first volume space have a recording density different from a recording density of the at least one recording layer of the second volume space; wherein the first volume space includes a first identification information of a head or end of the first volume space, a second identification information of the head or end of the second volume space and an area for data; wherein the second volume space includes the first identification information of the head or end of the first volume space, the second identification information of the head or end of the second volume space and an area for data; and wherein both the first identification information and the second identification information are recorded in the first volume space and the second volume space, respectively.