Increasing demand require new facilities or production lines
Increasing demand require new facilities or production lines that inevitably undergo growth pains. Proper vendor qualification and monitoring enables the user to confidently utilize the rich capabilities of CDR, and rewards the manufacture with recognition of their diligent efforts to attain and maintain product quality. Reliance upon brand names or upon readability of discs in one or few drives cannot verify longevity. Such methods are appropriate for all media types, and their proper application to CDR information storage will satisfy the critical requirements for interchange and longevity.. BLER values below per sec.
Only 47 of the failed discs. CDR media and drive manufacturers are responsible for product quality levels that support interchange and longevity. BLER was poor indicator, showing acceptable results for samples that failed other important quality requirements. This is not surprising, since BLER does not distinguish between easily correctable errors and severe uncorrectable errors, and fails to evaluate important parameters that can affect read drive servos. Standards ISOIEC 10149, ANSINAPM IT9. 211996, and others use BLER limit of per sec. Handling or storage conditions degrade good discs, especially if the thin, vulnerable protective coating on the label surface is flawed or damaged.
BLER was poor indicator, showing acceptable results for samples that failed other important quality requirements. Only 47 of the failed discs. CDR media and drive manufacturers are responsible for product quality levels that support interchange and longevity. Confidence in longevity can only be achieved by initial testing of drives and media, through proper handling and storage, and by periodic resampling to confirm longevity or to identify need for duplication while the original disc is still readable. Short cuts do not exist. Not all manufacturers achieve this goal. Exposure to radiation, inks, other chemicals, water, or pollutants can adversely affect CDR quality.
Discs of various dye types from different manufacturers were tested to ensure that conclusions were representative of current CDR technology. Media manufacturers estimate longevity by evaluating discs aged at elevated temperatures and humidities. BLER values below per sec., usually characteristic of high quality media, were present for 25 of the failed discs had BLER values between and Although environmental degradation should be avoided, major cause of deterioration is improper user handling based upon overconfidence in the robust construction and error correction of CDR media.
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