21 Jul
2018
21 Jul
'18
11:52 a.m.
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.