| http://www.w3.org/ns/prov#value | - Normally, each layer of the magnetooptical disk is formed through a film forming method such as sputtering, thereby resulting in a different film thickness in each layer of land portion 90A and groove portion 90B. This phenomenon is known as shadowing, wherein film thickness tb of recording layer 91B in groove portion 90B becomes less than film thickness ta of recording layer 91A on land portion 9
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