An information recording medium on which are recorded substantial data and reproduce control information for reproducing the substantial data, wherein the reproduce control information includes first reproduce control information required for reproducing the substantial data in all available reproduce patterns, and second reproduce control information required for reproducing the substantial data in a portion of the available reproduce patterns.

 
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> Method for nonsequentially writing reference spiral servo patterns to a disk to compensate for disk expansion

> Method for reducing disk thermal expansion effects while writing reference spiral servo patterns to a disk of a disk drive
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