Limbach & Limbach L.L.P.
Disc recording method
 In a disc recording method in which a disc on which servo control data is recorded in advance in alignment with a radial direction is divided into a plurality of zones in the radial direction and digital data having different clock rates are recorded on every zone, reference data for detecting the quality of a recording signal is recorded on a whole recording data area of one segment segmented by at least said servo control data. Therefore, the reproduction of data recorded in the zone-recording fashion can be controlled with ease in any zone. 
Sony Corporation
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Yoichiro Tamotsu Tetsu
Sako Yamagami Watanabe