Abstract
Testing systems and method for estimating dust adhesion characteristics are proposed. Cartridges are exposed to heavy concentration atmosphere of dust particles under the condition that the disks rotate and the shutters are opened. Before and after the exposure, byte error rates (BERs) and reflectivity of them are measured. Fifteen kinds of 90 mm magneto-optical disk cartridges from eleven makers on a laboratory level and one kind of commercial cartridge were tested. The other cartridges were exposed to the authors' laboratory environment, air cleanliness of which met class 1,000,000, for two thousand hours. Two commercial cartridges were exposed for about two years without BERs of them increasing. It was also confirmed that the disks used for testing regained initial states of BERs and reflectivity by cleaning.
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