We sometimes see a large cloud on optical disks that have been left for a long time in ordinary atmosphere. The higher the recording-density of the optical disk, the smaller the recorded size of each mark, the adhesion cannot be ignored for the drive performance. We used (NH
4)
2SO
4 to represent the cloud and a test apparatus to investigate the relationship between the optical disk conpound and the adhesion of (NH
4)
2SO
4. We showed the relationship between the adhesion and the read error rate, and discussed the influence of disk surface cloud on disk drive performance. Sector errors and ECC errors appeared when the adhesion was more than 2 % when the drive system used error correction code of RSPC (Inner code (182, 172, 11), Outer code (208, 192, 17)).
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