Recording medium, address recording method and apparatus, and re

Details Recording medium, address recording method and apparatus, and re Recording medium, address recording method and apparatus, and re

1997-03-17

1998-12-01

Neyzari, Ali

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

3692751, G11B 724

Patent

active

058448829

ABSTRACT:
Edges on both sides of each groove on a disk 11 are wobbled to indicate the addresses of recording locations. A laser beam for detection of data is radiated to a land for recording data, forming a spot 51-1. Two laser beams for detection of a tracking error are radiated to edges on both sides of a groove in such a way that the middle between the two laser beams coincides with the center of the groove, forming spots 51-2 and 51-3. By using such a tracking-error detecting laser beam to read out address information, the laser beam can be radiated to only the edge on a predetermined side of a groove. As a result, an address can be read out with a reduced amount of crosstalk from another groove even if the track pitch is small. Address information is thus read out with a highly accurate degree even in the case of a small track pitch.

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