| http://www.w3.org/ns/prov#value | - Thus, an erase method for read only data according to the present invention is an erase method of erasing read only data in an optical recording medium in which a phase change type recording layer is formed on a substrate and read only data is formed in the form of a plurality of pre-pits rows made in the substrate, wherein data different from the read only data is overwritten in the phase change
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