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Old January 13th 18, 01:04 AM posted to alt.windows7.general
Diesel
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Default Dell computer with no input

Char Jackson
Fri, 12 Jan 2018
16:55:30 GMT in alt.windows7.general, wrote:

For consumer writeable media, my understanding is that there's a
dye layer sandwiched between the two outer plastic sheets. When
you hit the dye layer with a laser, it darkens. That's later seen
as a digital "0". Areas that weren't hit with the laser stay
translucent, and are later seen as a digital "1".


Yep.

The part about "pits" and "lands" refers to commercially pressed
optical media. Consumer media doesn't have those characteristics.


Correct.

And, if air is ever allowed access to the material where your data
is actually stored, sandwiched between those two layers of plastic
that make the cd/dvd, bitrot will take hold and eat your data over
time.


In addition, the presence of that dye layer in writeable media is
why direct sunlight kills them. Over time, sunlight darkens the
dye layer, turning the 1's to 0's.


Yep. The bitrot issue happens on commercial discs too, if the
pressing process had a problem in some way and the seal doesn't hold.




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