Optical recording medium

Details Optical recording medium Optical recording medium

1992-08-03

1994-01-18

LaRoche, Eugene R.

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

369 56, 369 57, 360 2, G11B 2734

Patent

active

052804682

ABSTRACT:
This optical recording medium includes a data part which is a region for recording data and a directory part which is a region for recording its management or direction information. The directory information relating to the above-mentioned data is recorded in the above-mentioned directory part having a hierarchical tree structure. In the recording and reproducing apparatus by using the above-mentioned recording medium, in retrieving data, by retrieving the directory information in the order of a large classification, medium classification and small classification, the data can be detected. Even a large volume of data can be retrieved at a high speed and the data is efficiently managed. It is effective particularly with recording medium with small numbers of sectors per track such as an optical card.

REFERENCES:
patent: 4791623 (1988-12-01), Deiotte
patent: 4792936 (1988-12-01), Picard
patent: 4792937 (1988-12-01), Picard
patent: 4827462 (1989-05-01), Flannagan
patent: 4910725 (1990-03-01), Drexler
patent: 4945475 (1990-07-01), Bruffey
patent: 4979159 (1990-12-01), Tsurvoka

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