Patent ID: 8213279
Filing Date: 2012-07-03
Classification: G11B

Abstract:
1. An optical recording medium comprising: a plurality of recording and reading layers having a flat structure with no projection and depression for tracking control; and a servo layer having a groove and a land for tracking control formed thereon, wherein: information is recorded on the plurality of recording and reading layers while tracking control is performed using the servo layer; the groove and the land on the servo layer are tracking-controlled with a long-wavelength servo beam; the information is recorded on the plurality of recording and reading layers with a recording and reading beam having a wavelength shorter than a wavelength of the servo beam; groove-side recording marks are formed on the recording and reading layer with the recording and reading beam while the long-wavelength servo beam is projected onto the groove on the servo layer to perform tracking control; land-side recording marks are formed on the recording and reading layer with the recording and reading beam while the long-wavelength servo beam is projected onto the land on the servo layer to perform tracking control; and a track pitch between the groove-side recording marks and the land-side recording marks formed on the plurality of recording and reading layers coincides with a pitch between the groove and the land on the servo layer.