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User Name Thread Name Subject Posted
GUEST,Mr Red Tech: when a CD is 'read' (23) RE: Tech: when a CD is 'read' 11 Dec 09


modern CD's - the high speed ones - use as many as 9 layers of some pretty toxic materials. It is the aluminium reflective layer (or the aluminum layer in the US) that can be etched. Commercial CD's use pressings but the aluminium serves the same reflective purpose.

This etching crops-up every so often. Philips found out it was the ink permeating through the varnish covering the aluminium after a few years (maybe 5) but as the CD's become ever cheaper manufacturers try to cut corners and the new whizz kids learn that they are not as whizz as they thought - by which time they are long gone and so is your archive!

Poppy Records use CD's that are touted as lasting 300 years. Accelerated tests (temperature, humidity etc) probably indicate this is not too far out. I can never remember their name but it is probably HD or HRD or some such. They sell in the UK - that I do know.


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