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New CD longevity test information



I just received the report, "Measures of CD-R Longevity" from Jerome L. Hartke, President, Media Services, Inc. In the event you didn't get one and wish one, his website is http://www.mscience.com

It covers a series of tests they ran. Maddeningly, no specific products are identified. He gives his reasons. Given the design of the tests, he's probably right.

It's quite short and, I think, well worth reading.

Be advised that he offers his lab's services to evaluate CD longevity.

One important conclusion is that BLER is not a valid universal measure of quality. His reasoning is included.

However- this wouldn't be from me if there was no however:

Why not design the tests to be able to isolate data related to each manufacturer's product?

I feel very strongly that testing various dyes should be coupled with how the discs are surfaced. The speed at which discs are recorded is another variable. Cheap CDs have been widely reported to loose their lacquer before any significant data could be gathered on other longevity issues. The mating of reflective surface and its protective coating make every combination so different from the others that each is a unique product and should be so tested. Lumping them together makes no sense to me at all.