LG GWA-4161B Service Manual page 24

2) Recording format using organic dye material (DVD-R/DVD+R)
* The format that records data through the creation of recorded marks by changing the organic dye material
with a laser beam.
> Disc structure
DVD-R
> Disc structure
[Recording]
Recording is done by changing the organic dye layer and the substrate with a laser when a strong is
applied to a disc, the temperature of the ortanic dye material goes up, the dye is decomposed and the
substrate changes at the same time. At this time, a durable bit is created as is the case with a CD-ROM.
[Playback]
Signals are read with the differences of the reflection of a laser from pits.
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DVD+R
Adhesive layer
Protective layer
Reflective layer
Recording layer(dye)
Disc substrate
Adhesive layer
Protective layer
Reflective layer
Dye layer
Substrate
Laser beam
Adhesive layer
Protective layer
Reflective layer
Recording layer(dye)
Disc substrate