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LG GWA-4164B Service Manual page 33

Dvd/cd rewritable drive
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2) 2
st
Method : Using Blocked Write Strategy
NRZI
Channel bits
dP
p
dT
le
P
p
P
b
0mW
3T mark
4T mark
5T mark
Etc.
N = 3 : T
N > 4 : T
P
shall be < 0.1mW
c
Pp : Actual write power
Pb : Bias Power
dPp : Additional power ( Only be applied for the 3T and 4T marks)
Pc : Cooling power (Especially at higher recording speeds, optimum cooling down of the
2Tw
dT
top
T
top
dT
top,3
dP
p3
T
top,3
dT
le
dT
top,4
dP
p4
T
top,4
T
top,4
T
top,4
(cm = 3) can be optimized individually.
top
>
(cm
4) +
(N-3)
top
recording layer after writing a mark may be needed.)
Tw
T
lp
T
mp
1.25T
P
c
1.25T
w
P
b
P
c
1.25T
w
T
lp
1.25T
T
T
mp
lp
T
T
T
lp
mp
mp
x
T + T , T
w
w
lp
w
P
b
w
1.25T
w
= T
mp
37

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