Brian Swale wrote:
> Hi all,
>
> Although I can now save my digital images onto CD myself, at the moment I
> also get them burned onto CD at my local Photo store, since that also adds
> Agfa viewing software (latest version turns out to be not friendly with my
> old
> machine however). Also they have brought the cost down to 66% of cost 3
> weeks go.
>
> [snip]
>
> Her response was that since CDs (dye-burned, not pressed CDs) are
> essentially unproven, they should be backed up every 5 years; and here's a
> thought; she said quite matter-of-factly, store them flat or the pictures
> will
> slide off.
>
> So I wonder if there is any proven tendency for the dye layer to migrate
> under
> the force of gravity?
If that's so, it's absolutely news to me. I have always heard that music
CDs should be stored vertically to prevent any warpage (especially in
high heat). I'm not sure that dye-layer migration (_if_ it exists)
trumps warping of the substrate. I hope others will weigh in on the topic.
I think the far greater danger to the longevity of pictures kept
electronically is mentioned in your first paragraph: obsolescence of the
picture format and/or the filing system used to create the CD.
Steve
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