Patent ID: 8369195

Claim:
An information storage medium comprising: a plurality of recording layers each comprising a user data area in which data is recordable by a pickup; wherein the data is recorded in an order of the recording layers from closest to the pickup to farthest from the pickup; the recording layers comprise a first recording layer, and a second recording layer between the pickup and the first recording layer; a first recordable region in the user data area of the first recording layer in which the data is to be recorded is smaller than a second recordable region in a user data area of the second recording layer in which the data is to be recorded; the information storage medium does not comprise any other recording layer that is closer to the pickup than the second recording layer; the information storage medium does not comprise any other recording layer that is farther from the pickup than the first recording layer; the first recording layer further comprises a first region in which user data is not recorded located on an inner circumference of the user data area, and a second region in which user data is not recorded located on an outer circumference of the user data area; the second recording layer further comprises a third region in which user data is not recorded located on an inner circumference of the user data area, and a fourth region in which user data is not recorded located on an outer circumference of the user data area; the first region of the first recording layer is the only region between the inner circumference of the user data area of the first recording layer and an inner periphery of the first recording layer; the second region of the first recording layer is the only region between the outer circumference of the user data area of the first recording layer and an outer periphery of the first recording layer; the third region of the second recording layer is the only region between the inner circumference of the user data area of the second recording layer and an inner periphery of the second recording layer; and the fourth region of the second recording layer is the only region between the outer circumference of the user data area of the second recording layer and an outer periphery of the second recording layer, wherein each of a difference in size between the first region and the third region, and a difference in size between the second region and the fourth region, corresponds to about one-half a number of tracks of the second recording layer through which a recording beam emitted from the pickup would pass to record information on the first recording layer.