Re: Paper vs. CD Audit Trail

From: Charlie Strauss <cems_at_earthlink_dot_net>
Date: Thu Nov 11 2004 - 20:10:51 CST

voting records retention is 22 months in most states.

On Nov 11, 2004, at 11:44 AM, Keith Copenhagen wrote:

> I looked into paper vs. cd as an archive of record.
> Independent of any clear archive requirement (Other than surviving the
> 40 days before certification).
>
> Best Case Lifetime :
> Paper – Properly stored acid-free Archival sheet paper has a lifetime
> of
> 100 years.
> CD – Projected lifetime of dyes using accelerated ageing studies is 100
> years.
> DVD – No Data, I claim the underlying technologies are close enough to
> model using CDs.
>
> Purchase quality and handling are huge factors.
>
> Derating factors :
> Paper : Commodity Journal Rolls are probably 40-50% the quality of
> archival.
> Rolling or Folding, causes some degradation when unrolled
> (est. 10-20%).
> Rolling tension can put strong pressure on marks, (unquantified)
> Data is physical, and degrades over time.
> I estimate up to 35 years for mostly successful first read, using best
> practices..
>
> CD/DVD : Quality varies widely although the newer faster (50X) are
> culling out the lowest quality.
> Proper handling & reading should cause minimal
> degradation,
> signed digital data can be migrated.
>
> I estimate 20 – 60 years archival life, using best practices.
>
> In addition, it is important to consider how to read the medium
> Paper : Any custom paper roll reader has a very limited lifetime,
> probably requiring re-invention to read older data. (Speaking of 8”
> floppies).
> CD : CD/DVD reader technology has a limited lifetime, (CDs have
> been
> around for about 30 years, that may be a one time best-case, although
> the DVDs may carry the read capability longer than the “market
> transition” ).
>
>
> http://www.cd-info.com/CDIC/Technology/CD-R/Media/Kodak.html
> ;: KODAK Writable CD and Photo CD Media. …follow[ing] an Arrhenius
> model. That model predicts (at the 95% confidence level) that 95% of
> properly recorded discs stored at the recommended dark storage
> condition
> (25°C, 40% RH) will have a lifetime of greater than 217 years.
>
> http://desktoppub.about.com/library/glossary/bldef-archivalpaper.htm
>
>
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Received on Tue Nov 30 23:17:28 2004

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