Method : using blocked write strategy, 3t mark 4t mark 5t mark etc – LG GSA-4167B User Manual

Page 28

Advertising
background image

32

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

lp

T

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.)

>

Advertising
This manual is related to the following products: