how good is the data reliability with CD ROM and DVD RAM?

Jim Manley jim.manley at
Sat Jul 21 12:26:00 CDT 2018

The stability of the dyes is only part of the problem.  Even mass-produced
read-only optical media (e.g., movie/video content DVDs) can become
unreadable over time because the reflective layer (typically aluminum)
under the data-encoded layer corrodes due to the chemistry of the dyes and
encasing plastic, and heat accelerates the process.  The "gold" media may
have enough of a protective layer of that noble metal (it's obviously not
solid gold) that corrosion doesn't occur - only a few atoms' thickness is

On Sat, Jul 21, 2018 at 10:58 AM, Chuck Guzis via cctalk <
cctalk at> wrote:

> On 07/21/2018 08:14 AM, Carlo Pisani via cctalk wrote:
> > what is your experience?
> Generally very good.  But then, my valuable stuff on CD-R was done on
> MAM-A (Mitsui) "gold" media.  Some of it is 20+ years old.  On the other
> hand, no CD-RW disk that still have has survived.
> My experience with DVD-R has been somewhat variable.
> --Chuck

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