Patent ID: 8189438
Filing Date: 2012-05-29
Classification: G11B

Abstract:
1. A recording apparatus for recording onto a write once information recording medium having a plurality of recording layers, the recording apparatus comprising a light head device for irradiating a laser from one of a plurality of surfaces of the write-once information recording medium onto the once-write information recording medium, and wherein the information recording medium, in each of a plurality of the recording layers, includes a user data area for storing user data, an adjusting area used to adjust control parameters, and a test area used to adjust a recording laser power, wherein the adjusting area and the test area, in each of the plurality of the recording layers, are located at different positions, the recording layer which is located closest to the light head device among the plurality of recording layers passes through the laser, and a distance between the recording layer located closest to the light head device and the surface of the write-once information recording medium, and a distance between a recording layer other than the recording layer located closest to the light device and the surface of the write-once information recording medium, are different distances, wherein, prior to using the information recording medium, in each of the plurality of the recording layers, data is recorded within the entire area of the adjusting area, in the user data area the user data is recorded by forming a mark along a track, and in the adjusting area data is recorded by forming the mark along the track in the same manner of recording as in the user data area.