The recording system was periodically retested using known media and provided consistent results. A full suite of electrical tests was used to evaluate CD-R quality. Nominal results indicate high quality, while marginal or non-conforming results disclose problems that predict interchange and longevity failures. Local defects were evaluated using BLER, E22, E32, and burst error measurements. Environmental tests were not conducted, although heat, humidity, sunlight, and chemicals may degrade CD-R quality.
Experience indicates that longevity is best attained by assuring high initial quality.
Discs can then be stored under the proper conditions with confidence that they will always be readable in any system of reasonable quality. Return to Top of Page Test Results - Itop Intensity of the reflected laser beam as measured by Itop is important to readability. Reflectivity is affected by both the type and thickness of metallization and by attenuation in the dye layer. No discs failed, two were marginal, and ten discs passed. All six discs passed.