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Writing Process Of Cd-R Disc; Writing Process Of Cd-Rw Disc - LG GWA-4164B Service Manual

Dvd/cd rewritable drive
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5. Writing Process of CD-R Disc

Incident
Laser
Power
(Read)
Laser
Spot
Recorded
Mark
Reflected
Light
Signal

6. Writing process of CD-RW Disc

Crystal phase
quenching
gradual cooling
Erased state
(higher reflectivity)
28
(Write)
(Read)
a b c d e f
g
a
b
c
d
e
f
a b c d e f
g
Amorphous
Melting/
Heating/
Recorded state
(lower reflectivity)
Laser Spot
Position
(Time)
Reflected
Light
Signal
g
Laser Spot
Position
(Time)
Write Power
Erase Power
Read Power
Groove
Below "ORP"– Mark Too Short
At Optimum Record Power ("ORP")
Above "ORP" – Mark Too Long
Time
Crystal
Amorphous

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