Dynamic information storage or retrieval – Information location or remote operator actuated control – Selective addressing of storage medium
Patent
1988-12-16
1991-12-17
McElheny, Jr., Donald
Dynamic information storage or retrieval
Information location or remote operator actuated control
Selective addressing of storage medium
369 4413, 369 4426, 369 4434, G11B 700
Patent
active
050738801
ABSTRACT:
Data recording and/or reproduction on or from a recording medium on which tracking signal detection marks are intermittently provided along each track in a pattern wobbling alternately across the track center line with a very small lateral displacement therefrom, wherein data recording area is defined between the tracking signal detection mark. A servo control system for controlling a write/read light spot so as to follow the track with the aid of a tracking signal obtained by detecting the tracking signal detection marks is provided with a low-pass filter circuit having a cut-off frequency lower than the frequency at which the tracking signal detection marks are detected. A data is recorded or reproduced on or from the recording areas of the recording medium while following the track under the control of the servo system. A blank area where data recording is inhibited is provided between the data recording area and the tracking signal detecting mark (prepit) to suppress interference to the data. A particular access prepit pattern which allows track addresses to be at least approximately detected upon passing of the light spot over the track of the recording medium is previously provided together with synchronizing marks in a synchronizing area.
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Maeda Takeshi
Tsunoda Yoshito
Hitachi , Ltd.
McElheny Jr. Donald
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