VERY long term storage

I'm wondering if anyone has any input on the best solution for very long term data storage. I know there are problems such as accessibility, like if you save a heavily formatted document in MS Word now and someone tries to open it a long time from now, there may be nothing compatible that can read it (although as far in the future as I'm thinking, that seems unlikely). Mostly I'm wondering about media. I'm pretty sure that even the best CDs or DVDs won't last more than a few decades, flash drives shouldn't be relied on for any sort of permanent storage and anything magnetic will probably be fouled up over time. Okay so how long am I talking about? I don't know, maybe centuries. Probably centuries, maybe a few millennia. Just toying with an idea and wondered if anyone knows of any technology today that has that potential. I think our ancestors had it right when they carved everything in stone! :)

========================= update =================

I found some interesting answers here (i like the etched nickel discs the best :))

http://superuser.com/questions/374609/what-medium-should-be-used-for-long-term-high-volume-data-storage-archival

It's amazing to me that with all the tech we have now, the right paper and the right ink, all stored correctly is still the longest term prospect.
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More about long term storage
  1. "data crystals", not only can they potentially store a lot of data and keep it virtually eternally, but they're also pretty resistant to the forces of nature such as water or fire. Hitachi announced they were gonna be releasing some in 2015 but that the storage space won't be that much. This technology is still in its infancy and has a lot of room to grow so in 30 years we might all be using them.
  2. roymustang said:
    "data crystals", not only can they potentially store a lot of data and keep it virtually eternally, but they're also pretty resistant to the forces of nature such as water or fire. Hitachi announced they were gonna be releasing some in 2015 but that the storage space won't be that much. This technology is still in its infancy and has a lot of room to grow so in 30 years we might all be using them.


    Very cool. You brought up something that I neglected to include in my OP. The idea that tech is still rapidly changing and it's hard to say what the options will be in 30 years. CD's are still pretty young. I bought my first music CD almost 30 years ago and everyone else was still buying vinyl. So we have a long way to go. I know I'm not the only one wondering what's possible with the future of storage. So I guess that even if it's on something that only lasts 20 years now, by then we're sure to have something that will last a lot longer. I love the Hitachi idea. Very sweet. Thanks.
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