4 ms·

What happens at 13.9B years?

by fredsted 7y ago

Chris_Chambers 7y ago
Warranty expires.
xattt 7y ago
Heat death of the universe
- RobertoG 7y ago
  I don't think so.. I think that's the estimated current age of the universe.
- jobigoud 7y ago
  Not even close. I've seen figures in the order of 10^1000 years for the Heat Death.
cm2187 7y ago
I don't know, but if it happens at 13.7B years you RMA it!
Nux 7y ago
Nothing, it's roughly the current age of the universe.
danbruc 7y ago
Most likely the defect rate will reach a specific value so that the storage medium is no longer considered reliable.
simonh 7y ago
I'm guessing that's the estimated time it would take for entropy in the material to render the data unreadable. They specify at room temperature, so I'm pretty sure they're talking about entropic disruption of the structure due to thermal effects. Note that 'glass' is a hugely varied class of materials, so without knowing much more we can't make spot judgements about the validity of the claim.
- kragen 7y ago
  No, 10–100 billion years is at 462 K, which is a lot hotter than room temperature. At room temperature the estimated lifespan (or, really, the time constant τ) is 3×10²⁰ years.
  - simonh 7y ago
    That's really great, precise information. Where did you get it from? Also which exact material is that for? As I said, there are a lot of different things called 'glass'.
    - kragen 7y ago
      From the paper: https://www.researchgate.net/profile/Ausra_Cerkauskaite2/publication/297892219_Eternal_5D_data_storage_via_ultrafast-laser_writing_in_glass/links/59fb2de00f7e9b9968b962dd/Eternal-5D-data-storage-via-ultrafast-laser-writing-in-glass.pdf?origin=publication_detail https://www.researchgate.net/profile/Ausra_Cerkauskaite2/pub... They're using fused quartz, as one does. I'm guessing it would be a bit easier to use soda-lime glass, and also reasonably stable, but considerably less stable.
- hilbert42 7y ago
  "Note that 'glass' is a hugely varied class of materials, so without knowing much more we can't make spot judgements about the validity of the claim." As I say in part of my post the key issue here is the intrinsic property of this "glass" which will be of a crystalline-like nature, to quote: <...> 5. We know that under ideal conditions some crystals such as zircon and others have lives of much longer than 4.4 Gy. Why? Well crystal structures are known to be the most stable forms of matter in the universe that goes with the fact that they have the lowest entropy: https://www.livescience.com/50942-third-law-thermodynamics.h.. https://www.livescience.com/50942-third-law-thermodynamics.h.... — to quote: “The entropy of a perfect crystal is zero when the temperature of the crystal is equal to absolute zero (0 K).” <...>

What happens at 13.9B years?

Chris_Chambers 7y ago

Warranty expires.

xattt 7y ago

Heat death of the universe

RobertoG 7y ago
I don't think so.. I think that's the estimated current age of the universe.
jobigoud 7y ago
Not even close. I've seen figures in the order of 10^1000 years for the Heat Death.

cm2187 7y ago

I don't know, but if it happens at 13.7B years you RMA it!

Nux 7y ago

Nothing, it's roughly the current age of the universe.

danbruc 7y ago

Most likely the defect rate will reach a specific value so that the storage medium is no longer considered reliable.

simonh 7y ago

I'm guessing that's the estimated time it would take for entropy in the material to render the data unreadable. They specify at room temperature, so I'm pretty sure they're talking about entropic disruption of the structure due to thermal effects. Note that 'glass' is a hugely varied class of materials, so without knowing much more we can't make spot judgements about the validity of the claim.

kragen 7y ago
No, 10–100 billion years is at 462 K, which is a lot hotter than room temperature. At room temperature the estimated lifespan (or, really, the time constant τ) is 3×10²⁰ years.
- simonh 7y ago
  That's really great, precise information. Where did you get it from? Also which exact material is that for? As I said, there are a lot of different things called 'glass'.
  - kragen 7y ago
    From the paper: https://www.researchgate.net/profile/Ausra_Cerkauskaite2/publication/297892219_Eternal_5D_data_storage_via_ultrafast-laser_writing_in_glass/links/59fb2de00f7e9b9968b962dd/Eternal-5D-data-storage-via-ultrafast-laser-writing-in-glass.pdf?origin=publication_detail https://www.researchgate.net/profile/Ausra_Cerkauskaite2/pub... They're using fused quartz, as one does. I'm guessing it would be a bit easier to use soda-lime glass, and also reasonably stable, but considerably less stable.
hilbert42 7y ago
"Note that 'glass' is a hugely varied class of materials, so without knowing much more we can't make spot judgements about the validity of the claim." As I say in part of my post the key issue here is the intrinsic property of this "glass" which will be of a crystalline-like nature, to quote: <...> 5. We know that under ideal conditions some crystals such as zircon and others have lives of much longer than 4.4 Gy. Why? Well crystal structures are known to be the most stable forms of matter in the universe that goes with the fact that they have the lowest entropy: https://www.livescience.com/50942-third-law-thermodynamics.h.. https://www.livescience.com/50942-third-law-thermodynamics.h.... — to quote: “The entropy of a perfect crystal is zero when the temperature of the crystal is equal to absolute zero (0 K).” <...>