Abstract
We developed a testing method to determine the influence of dust adhesion on digital versatile disk (DVD). First, the dust testing system was developed. This system can control the dust density with an accuracy of ±20%. Second, the dust testing method was investigated. Reflectivity and jitter deteriorated gradually, making it easy to estimate the readability and lifetime of DVD. The system, testing procedure, and estimation indexes are adequate for the DVD dust test. Dust adhesion was observed. Dust particles adhere along the airflow direction and accumulate to 100 µm thickness. Third, in order to discuss the difference in readability between disks of 0.6 mm and 1.2 mm substrate thicknesses, the dust test was performed for DVD and compact disk (CD). It was found that the normalized reflectivity of DVD is 7% smaller than that of CD after 100 h exposure.
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