Dynamic information storage or retrieval – Storage medium structure – Optical track structure
Patent
1994-11-08
1995-10-17
Pascal, Robert J.
Dynamic information storage or retrieval
Storage medium structure
Optical track structure
3692751, 369276, 369 48, 369 49, G11B 2300
Patent
active
054597102
ABSTRACT:
An information recording and reproducing method and apparatus with increased recording density of an information recording medium using the sample servo method driven with a fixed angular velocity from the innermost circumference to the outmost circumference. A disk-shaped recording medium is concentrically divided into a plurality of areas. Recording is performed with a recording density suited for the radial position of each of the areas. The width of the areas is set so that the recording capacity of a user data section sandwiched between servo sections forming a segment may increase with every transition to an outer adjacent area while taking one byte as a unit. The recording and reproducing apparatus has a clock generating circuit for servo data extraction and a clock generating circuit for user data extraction. The latter clock generating circuit is synchronized by a synchronizing pulse generated by the former clock generating circuit.
REFERENCES:
patent: 5056080 (1991-10-01), Russell
patent: 5172357 (1992-12-01), Taguchi
Hoshino Takashi
Ikeda Tetsuya
Ishii Junichi
Hitachi , Ltd.
Pascal Robert J.
Ratliff Reginald A.
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