On 2/19/07, Doug McGarrett <[EMAIL PROTECTED]> wrote:
On Monday 19 February 2007 14:17, David Brodbeck wrote:
> S Glasoe wrote:
> > Don't know about the glue eating the data layer. I thought labels and
> > adhesives just took off the reflective layer causing a loss of
> > readability. Data is still there if you can replace the reflective
> > coating...
>
> I've found on some cheap media the lacquer on the label side is very
> thin, making it easy to chip the reflective layer and lose data.
>
> I've also erased CD-Rs accidentally by leaving them in direct sunlight.
> The UV seems to bleach the dye out of the data layer.
>
>
> Other than that I've had remarkably few problems reading CD-Rs that are
> a decade old. CD-RWs seem to suffer more from bit-rot. My 20-year-old
> 720K floppies aren't doing so hot, either. ;)
I have had numerous problems trying to read old floppy disks. While that was
almost the only backup medium, it has turned out to be pretty flaky. Old
audio tapes may sound OK, but who knows how many drop-outs there might
be in a digital version of same? I would guess that a number of major
corporations are finding that their digital tapes are not completely
readable--but you'll probably not read that in the Times' business section!
It would seem that the perfect backup medium would be carving on stone!
--doug
I think the best realistic method is still Micro-fiche. Still only
rated for 100 years (IIRC) but truly believed to last that long.
AIUI, some companies still save very important documents to
micro-fiche for that very reason.
Greg
--
Greg Freemyer
The Norcross Group
Forensics for the 21st Century
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