Basic Physical Construction Method for Preformatted Information on the Guide Layer of Super-Multilayer Disc

Abstract

In this paper, we describe a new physical construction method to assign preformatted information on the guide layer of a super-multilayer disc. A minimum unit of the physical construction consists of “basic mark” and “center track mark”. The basic mark consists of plural wobbled grooves and the center track mark is introduced to identify the center track of the basic mark. We designed a new physical format of the guide layer allocating those marks and experimentally confirmed the bit error rate below 1×10-4 and the defocus margin around 3 µm, which satisfy requirements for realizing an optical disc system.

A high transmittance optical recording material with long-term reliability for super-multilayer discs

“…Optical discs are extensively used as long-term storage media for data archival because they offer high data reliability and low operating costs. [1][2][3][4][5] As a means of increasing the data storage capacity, several technologies have been reported, such as holographic technology, 6,7) near-field technology, 8,9) multilayer technology, [10][11][12][13][14][15][16] and others. [17][18][19][20][21][22][23][24] Among these, multilayer recording technology is a promising approach because it can utilize most technologies of the Blu-ray Disc™ system that is already in use as a commercial technology.…”