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Do not place discs directly onto the workbench, etc., after use.
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Handle discs carefully in order to maintain their flatness. Place them into their case after use and store them vertically. Store discs in a cool place where they are not exposed to direct sunlight or air from air conditioners.
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Accurate adjustment will not be possible if the disc is warped when placed on a surface made of glass, etc. If this happens, use a new test disc to make optical adjustments.
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If adjustment is done using a warped disc, the adjustment will be incorrect and some discs will not be payable.