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

Al Kossow aek at
Sat Jul 21 13:52:33 CDT 2018

On 7/21/18 10:26 AM, Jim Manley via cctalk wrote:
> 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 edge of the disk is SUPPOSED to be sealed. On cheap media, you see it
oozing, and the aluminum oxidizing from the edge inward. This was pointed
out to me already in the late 90's.

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