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2) 2
st
Method : Using Blocked Write Strategy
NRZI
Channel bits
2Tw
Tw
dT
top
T
top
dT
le
P
p
P
b
T
mp
lp
T
dP
p
0mW
P
c
P
b
1.25T
w
3T mark
4T mark
5T mark
Etc.
dT
top,3
dP
p3
T
top,3
dT
le
1.25T
w
P
c
P
b
1.25T
w
1.25T
w
1.25T
w
dT
top,4
dP
p4
T
top,4
T
lp
T
top,4
T
top,4
T
mp
T
mp
T
lp
T
lpT
mp
N = 3 : T (cm = 3) can be optimized individually.
N
>
4 : T (cm 4) + x (N-3) T + T , T = T
P shall be < 0.1mW
top
mp
lp
w
w
top
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
recording layer after writing a mark may be
needed.)
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