| 摘要 |
A recording medium has a circular substrate, grooves formed on the substrate, a land formed between the grooves, a plurality of land prepits formed between the grooves. The groove and the land prepit are formed so as to satisfy a following formula,where Gw is the width of the groove, Lp is the length of the land prepit in a radial direction of the substrate, lambd is the wave length of light used in a system for recording information on the recording medium, and NA is the numerical aperture of an objective in the system.
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