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Re: File Archiving [redux]

Subject: Re: File Archiving [redux]
From: "Rob Danielson" danielson_audio
Date: Sat May 29, 2010 12:10 pm ((PDT))
At 9:04 AM -0700 5/29/10, umashankar wrote:

re:
>dvd=A0back ups look promising but=A0if one disk out
>of ten fails in a few years (and they do),..

About 5-6 years ago, I started following the
suggestions in a study produced US Library of
Congress and National Institute of Standards and
Technology http://tinyurl.com/2bve9d8 (pdf)=A0 to
use discs with phthalocyanine dye on a silver and
gold alloy reflective layer and to burn the media
at no more than 2X rate. I was able to find a
Block Error Rate (BLER) study on line that used
conforming Mitsui and Taiyo Yuden Silver Silver
DVD-R media and rated current CD/DVD burners
(2004).  I bought a Pioneer model 107D which
scored high and, so far, none of the 2000+
DVD-R's I've burned with this device/media has
failed to mount or restore data. Out of the 600
disc orders, I track the number of discs that do
not verify after burning and the maximum number
has been 4. My cost is less than 10 cents/GB
including plastic sleeves and storage cases. I
store my media in light tight cases from 62-72
degrees at 50% humidity.

Studies estimate disc longevity for the
phthalocyanine/metal combination under proper
storage conditions from 30-250 years. Today, one
can buy gold DVD-R media with phthalocyanine dye
which some reports suggest is a more stable
combination.

In support of umashankar's observation, I have
received quite a few DVD and CD's of other types
burned with other burners fail to mount,
including burners that came in brand new Macs and
PC's.

The last time I looked for a similar Block Error
Rate (BLER) tests for current burners/media, I
didn't come-up with much. If I we're getting
started with DVD-R archiving right now, finding a
good BLER study is where I'd start. Plextor and
Pioneer had consistently higher scores in
2004-2005; I'm not sure what the state of burners
is right now. Once you find a confirmed
burner/media combination, I'd consider buying two
or more of the burners. Rob D.


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