Patent ID: 8111604
Filing Date: 2012-02-07
Classification: G11B

Abstract:
1. A fabrication method of a multilayer optical recording medium having a plurality of recording layers, comprising: a write-position mark forming step of forming write-position marks in a record area of said multilayer optical recording medium; a step of preparing an optical system including a common objective lens to focus a data recording beam and a position mark recording beam on different positions in a thickness direction of said record area; a first data writing step of writing data in a first recording layer of said plurality of recording layers between said write-position marks with following said write-position marks by said data recording beam focused by said optical system; and a position mark recording step of, recording new write-position marks in a second recording layer of said plurality of recording layers as data is written in said first recording layer which is in a different position from said second recording layer in said thickness direction of said record area by said position mark recording beam focused by said optical system.