Surface precision is vital for DVD test discs. Be sure to store and handle them carefully.
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Do not leave the discs uncovered on the work desk or other places after use.
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Handle the discs carefully to prevent scratches. Put each disc in its case and place it in the standing position. Store the discs in a cool place and avoid direct sunlight or air conditioner.
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Accurate adjustment cannot be expected with a disc warped against a flat surface. Obtain a new test disc for optical adjustment.
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If a warped disc is used, adjustment would result incorrectly, and other discs could not be used.