Dynamic information storage or retrieval – Storage medium structure – Optical track structure
Patent
1997-02-28
1999-08-31
Hindi, Nabil
Dynamic information storage or retrieval
Storage medium structure
Optical track structure
G11B 708
Patent
active
059462850
ABSTRACT:
In optical disk having a track formed of groove tracks and land tracks connected every revolution to form a single spiral, each revolution-of the tracks is divided into sectors, each having identification signal region at the head of the sector, and the identification signal regions in tracks adjacent to each other are aligned in the radial direction. Prepits are formed in the identification signal region, on an extension of a boundary between groove and land tracks adjacent to each other. The prepits have a width substantially equal to the width of the grooves. The identification signal including address information of the sector. The polarity of tracking error signal is detected at the identification signal region of the recording sector, and whether the recording sector is in a groove track or land track is determined based on the polarity of tracking error signal. The identification signal may include information concerning the timing for switching tracking polarity in accordance with whether groove or land sector is being scanned.
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Gotoh Kenji
Ishida Yoshinobu
Komawaki Kouichi
Nagasawa Masato
Nakane Kazuhiko
Hindi Nabil
Mitsubishi Denki & Kabushiki Kaisha
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