Comme les suggestions de lecture ont rarement un grand succès sur les forums ...
Je résume ci-dessous l’essentiel de la communication de la société
Cranberry
que l'on trouvera ici:
http://cranberry.com/index.php#
Tout d'abord ils citent la mise en garde émise par la Librairie du Congrès US:
« The National Archives warns that CD/DVD life expectancy
is 2 to 5 years ! »
Cette mise en garde a été publiée sur le site des ‘National Archives US’:
http://www.archives.gov/records-mgmt/in ... a-faq.html6. How long can I expect my recorded CDs/DVDs to last?
CD/DVD experiential life expectancy is 2 to 5 years even though published life expectancies are often cited as 10 years, 25 years, or longer. However, a variety of factors discussed in the sources cited in FAQ 15, below, may result in a much shorter life span for CDs/DVDs. Life expectancies are statistically based; any specific medium may experience a critical failure before its life expectancy is reached. Additionally, the quality of your storage environment may increase or decrease the life expectancy of the media. We recommend testing your media at least every two years to assure your records are still readable.
Puis en ce qui concerne les fameux médias
‘Archival Grade’ ou ‘Gold’ voici ce qu’ils ajoutent:
http://cranberry.com/index.php#When information burned on their DVDs began to disappear, manufacturers assumed the problem was due to the silver reflective back becoming tarnished, so Gold DVDs were introduced because gold doesn’t tarnish. Now the Gold DVDs are degrading as fast as the silver ones.
The problem turned out to be the fading of the laser-sensitive ink in the sandwich layer between the clear plastic and the reflective surface.
En un mot même pour ces médias beaucoup plus chers dont la couche réfléchissante contient de l'or
tout repose sur le vieillissement plus ou moins rapide de la
« dye organique » pour le choix de laquelle on est renvoyé à la FAQ n°4:
http://www.archives.gov/records-mgmt/in ... a-faq.html 4. What is the significance of different colors for CDs/DVDs?
The color of a CD/DVD indicates its quality. It is best to look for a gold or silver CD/DVD - look at the color from the underside of the disk, not the top.
In addition, to assure the highest quality of a CD-R, look for those manufactured using phthalocyanine dye with gold or silver reflective layers. Do not use Azo- or (plain) cyanine-dyed media. For DVD-Rs, purchase double-sided/single-layer with a gold reflective underside.
To assure you're using the highest quality CD/DVD and/or to avoid pitfalls in purchasing the correct type, refer to the source references in FAQ 15, below.
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