LG GSA-4167B - Manual (Page 25)

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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.
DVD-R
Adhesive layer
Protective layer
Reflective layer
Recording layer(dye)
Disc substrate
DVD+R
Adhesive layer
Protective layer
Reflective layer
Recording layer(dye)
Disc substrate
Adhesive layer
Protective layer
Reflective layer
Dye layer
Substrate
Laser beam
> Disc structure
> 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.