Multilayered optical disk and its recording method

A method for performing test recording on a multilayered optical disk which has three or more recordable or rewritable information recording layers, comprising the steps of:

• performing a test recording in an arbitrary recording unit block in a second test area in a second recording layer that is closer to a light incident surface than a first recording layer;
• identifying a recording unit block in a first test area in the first recording layer which has a radial distance that is less than a predetermined distance L, which is based, in part, on predetermined parameters of the optical disk, from the recorded test area in the second test area;
• and
• setting the identified recording unit block as a recording unit block in which test recording is not performed,
• wherein the radial distance L is determined based on a manufacturing error of the optical disk.

A multilayered optical disk having three or more recordable or rewritable information recording layers, comprising:

• a first recording layer including a first test area having a plurality of segments;
• a second recording layer located on a side nearer to a light incident surface than the first recording layer, said second recording layer including a second test area having a plurality of segments;
• an arbitrary segment in the second test area on which test-recording has been performed;
• and
• a segment in the first test area that is set as a segment in which the test recording is not performed,
• wherein the set segment has a radial distance from the arbitrary segment that is less than a predetermined radial distance L, and
• wherein the radial distance L is determined based on a manufacturing error of the optical disk.

An information reproduction method for reproducing information recorded on a multilayered optical disk having three or more recordable or rewritable information recording layers, comprising:

• determining whether an arbitrary segment in a second test area in a second recording layer is test-recorded, the second recording layer being located on a side nearer to a light incident surface than a first recording layer;
• and
• setting a segment in a first test area in the first recording layer as a segment in which test recording is not performed,
• wherein the set segment has a radial distance from the arbitrary segment that is less than a predetermined radial distance L, and
• wherein the radial distance L is determined based on a manufacturing error of the optical disk.