[agumonkey]

I was too young at the time optical medium was everywhere to search for actual data, and public claims were contradictory (5 years, 10 years .. more .. ). And that was CD-ROM density.

Interestingly, http://blog.digistor.com/the-unparalleled-durability-of-blu-... says that there were new design constraint in blurays making them much more durable.