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The M-Disc claim of 1000 years is based on a few estimated tests and while they mostly hold up, we have objective proof that glass left alone over 1000 years do

by smush 7y ago

The M-Disc claim of 1000 years is based on a few estimated tests and while they mostly hold up, we have objective proof that glass left alone over 1000 years does not change to the point that if you wrote something on year x, time-travelled with your reader to year 1000x , the reader would be unable to read it. I don't expect to crack 90 years myself, but my great-great-grandchildren might want or need whatever data there is on that glassdrive, even if it is only pictures and not something important like legal documents. The 'rest of your life+' claim is simply my shorthand for saying that while the glass will likely last for thousands of years, how long the readers exist that can read that particular glassdrive and interpret its data (ANSI or Unicode text, PNG or PDF display capability) may or may not last as long as the glassdrive itself can (see Voyneuch manuscript which exists, but we no longer can read and interpret it).

mywacaday 7y ago
I am aware of a company that user to sell a long term DVD like storage disk that they claimed would last for 100+ years, 5-6 years in disks started to lose data, I now take lifetime claims with a big pinch of salt.
- smush 7y ago
  Exactly. But glass is glass, so the amount of believing we have to do with a pane of glass / quartz with this system is much less of a leap than with a pressed circle someone made in cheap-as-possible-for-profit-margins-increases factories, organic dye or not.
- chihuahua 7y ago
  Indeed, I think of those claims as a mixture of optimism, wishful thinking, and marketing drivel. How can someone claim that it lasts for 100 years, unless you have tested that claim by waiting 100 years and then verifying that the data is still there ? After many years of experience with CD-R and DVD-R, one can say that those disks are good for at least 3 years. But we can only say that because lots of people have successfully read CD-Rs that were 3 years old. Also, they can sell those "100-year" disks with these claims, and when customers lose data after 5-6 years, the company just says "oh that's too bad, maybe you stored them where the temperature fluctuated by more than +/- 0.1 degrees Celsius ?" and you have no recourse other than not giving them more of your money in the future.

by smush 7y ago

mywacaday 7y ago

I am aware of a company that user to sell a long term DVD like storage disk that they claimed would last for 100+ years, 5-6 years in disks started to lose data, I now take lifetime claims with a big pinch of salt.

smush 7y ago
Exactly. But glass is glass, so the amount of believing we have to do with a pane of glass / quartz with this system is much less of a leap than with a pressed circle someone made in cheap-as-possible-for-profit-margins-increases factories, organic dye or not.
chihuahua 7y ago
Indeed, I think of those claims as a mixture of optimism, wishful thinking, and marketing drivel. How can someone claim that it lasts for 100 years, unless you have tested that claim by waiting 100 years and then verifying that the data is still there ? After many years of experience with CD-R and DVD-R, one can say that those disks are good for at least 3 years. But we can only say that because lots of people have successfully read CD-Rs that were 3 years old. Also, they can sell those "100-year" disks with these claims, and when customers lose data after 5-6 years, the company just says "oh that's too bad, maybe you stored them where the temperature fluctuated by more than +/- 0.1 degrees Celsius ?" and you have no recourse other than not giving them more of your money in the future.