Optical media lifespan for digital preservation?

Optical media lifespan for digital preservation? 

I’m looking at at a longterm digital object preservation strategy that includes optical media. I need to assume that the lifespan of the media will include periods in a substandard environment such as high humidity and temperature : this is Australia after all, and I can’t control the future, and I need to assume that preferred regular refreshing of the media every few years by copying may not actually happen.

Source: Google Groups

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