Optical disc and optical disc device

Abstract

A novel optical disc which, while having interchangeability with a conventional MD or MD data, has a capacity far exceeding the capacity of these optical discs, and an optical disc device. The optical disc and the optical disc device take into account the constraints of the skew accompanying the increased recording density. By setting the jitter produced when recording random pattern signals on one track only to not more than 8.4% and by setting jitter increase on recording signals also on both side neighboring tracks to not more than 4.9%, the skew margin in the radial direction of not less than +-0.7 DEG and that in the running direction (circumferential direction) of not less than +-0.6 DEG are assured.

Description

technical field [0001] The invention relates to a novel small-diameter and large-capacity optical disc. More specifically, it relates to an optical disc device using the optical disc. Background technique [0002] Large-capacity data for still images or moving images is stored on a recording medium such as an optical disk, and is randomly accessed and copied as required at any time. [0003] The optical disk can be accessed randomly, and the recording density of the optical disk is higher than that of a magnetic recording medium such as a so-called floppy disk, and if the disk is a magneto-optical disk, data can be rewritten. Therefore, optical discs are suitable for storing large-capacity data. [0004] Recently, the demand for increasing the capacity of optical discs has further increased, and thus the development of large-capacity and small-sized optical discs is imperative in view of ease of handling. [0005] As a small-sized optical disc, a magneto-optical disc havi...

AI Technical Summary

Problems solved by technology

However, the recording capacity cannot be increased beyond 140MB

[0006] This 140MB recording capacity cannot be said to be enough

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