| http://www.w3.org/ns/prov#value | - Such a magneto-optic disk 10 has, as shown in FIG. 10, tracks (concentric tracks) formed thereon along concentric circles with respect to its chucking hole 12, and each track has a plurality of sectors 16 formed in the circular direction at a predetermined pitch, the sectors storing video data, audio data, and other data.
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