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Standards only require CD-ROM and CD-R discs to have a BLER less than 220. Why bother with tighter limits or other tests such as E22 and E32?

April 26, 2017BLER bother CD-R CD-ROM discs limits require Standards tighter

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Standards only require CD-ROM and CD-R discs to have a BLER less than 220. Why bother with tighter limits or other tests such as E22 and E32?

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• My CD-ROM discs unpredictably fail in the field. Some show E22 and E32 errors that do not always reproduce when the disc is retested. What is wrong with the data on these discs? • What is CD unbalance? Why do I keep hearing about it? • Why do CD discs fail in some drives but are readable in others? • CD discs work great in our test drive. Why do they fail in some 40X and higher speed drives? • Fragile CD discs are causing user problems. They crack or even shatter in high speed drives. What causes this? Discs appear to satisfy the standards. • My CD-ROM discs sometimes contain milky areas when viewed from the readout side. When I call this to the attention of their manufacturer, I am told that the effect is only cosmetic. Sometimes I cannot read such discs. Is it possible that my quality problems are related to this unusual appearance? • ISO, ECMA, and ANSI Standards for diskettes designate PTB Reference Material. CD-ROM Standards do not. Why? • I do not obtain the same CD test result