The reason pressed discs can deteriorate over time is, that the reflective layer made of metal (aluminium) can oxidize (“rust”) if the disc is not perfectly sealed to prevent air from seeping in.[/QUOTE]
so basically a scratched disc nullifies a sort of “air-tight” protection that protects the metallic sheet inside the disc from rusting?
and about the air and rusting… during humid days in summers seasons when disc retail stores like HMV would turn off the air-conditioner at night , and in the morning when they’d turn it back on… wouldn’t the rapid change in humidity ruins the disc as well? because it would generate some moisture in the metallic layer inside the disc?
most people have cds in their car’s audio player or the case storage compartment, with frequent traveling… wouldn’t there also be more constant exposures and transitions between hot and cold temperatures? wouldn’t taking disc along like that poses a greater risk of killing off those favorite cds a lot faster than if it were to just left indoors?
eg: sun’s heat = cd warms up
turn on airconditioner =cd cools down
engine off = gets hot from sun again
thanks for the replies!