Optical disk, disk substrate, and drive

Details Optical disk, disk substrate, and drive Optical disk, disk substrate, and drive

2006-04-11

2006-04-11

Chen, Tianjie (Department: 2656)

Dynamic information storage or retrieval

Storage medium structure

Specific disc profile

Reexamination Certificate

active

07027385

ABSTRACT:
An optical disk100is provided with a hub3at the central portion of a substratel. A relationship Y/X≧0.015, preferably Y/X≧0.05 is satisfied where X is the projected area of the substrate1and Y is a contact area between the hub3and the substrate1. As result, no slippage occurs between the hub3and the substrate1even when they are rotated at high speed than conventional. With this higher rotational speed, the data transfer rate is improved, and irregular rotation and the camming are suppressed, thereby reducing tracking errors and write/read errors.

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