Optical data storage medium and methods for reading and...

Details Optical data storage medium and methods for reading and... Optical data storage medium and methods for reading and...

2006-04-11

2006-04-11

Hindi, Nabil (Department: 2655)

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

C369S047220

Reexamination Certificate

active

07027383

ABSTRACT:
An optical data storage medium (1) is described. The medium (1) has an optically readable information layer with a first optical reflectivity. An annular zone (12), outside the user data recording area (2) has at least one first type (5) of sector provided with a permanent information mark (7), having a second optical reflectivity. The zone has at least one second type (6) of sector provided with a recordable identification mark (8), having a third optical reflectivity different from the first optical reflectivity. Thus, a hybrid bar code like structure, with both permanent and recordable information requiring little radial space, is provided. Further, methods to read such permanent information marks (7)/recordable identification marks (8) and to write such recordable identifications marks (8) are disclosed.

REFERENCES:
patent: 6584046 (2003-06-01), Oshima et al.
patent: 6728181 (2004-04-01), Shimoda et al.

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