Re: Question - Lifespan of digital media

> You would get degradation from cosmic rays. Cooling to space ambient
> given different linear coefficients of thermal expansion of glass and
> gold would cause defects.
>
> Make your glass (fused silica; silicon wafer; CVD diamond), nickel, or
> gold masters. Space them with UHMW polyethylene films under dry
> argon. Stick them in an inch-thick sealed cylinder of Hastelloy C2000
> (UNS N06200, W Nr. 2.4675). Thread/tap (Spiralock female) two 1/2"
> thick cylinders and screw them together along their entire lengths,
> ending with permanent anaerobic thread seal added. Stick that in an
> inch-thick sealed cylinder of UHMW polyethylene, and store deep in a
> limestone cave or deep mine in Lead or Sudbury. That will pretty much
> resist anything short of temblors and vulcanism, forever.
>
> Halocarbon polymers can eventually emit HX.
>

OK Let me be more specific. Imagine that the data is on a probe that leaves
the solar system and makes its long trek to - say - Proxim Centauri, our
nearest neighbour, crossing the gulf of interstellar space, where -
presumably - not a lot goes on.

180,000 years later, our probe is approaching its destination. Will it be
intact and readable by any prospective space-faring life-forms?

Alternatively it leaves the solar system and just wanders randomly through
space.
What is the best solution for a DVD master that would give the longest
lifespan?


><Phant


.

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