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The Differences Of Cd-R/Cd-Rw Discs And General Cd-Rom; Recording Layer; Disc Specification - LG GWA-4164B Service Manual

Dvd/cd rewritable drive
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The differences of CD-R/CD-RW discs and General CD-ROM

1. Recording Layer

Recordable CD has a wobbled pre-groove on the surface of disc for laser beam to follow track.
Read-only Disc
CD-ROM (READ-ONLY DISC)
CD-R and CD-RW Disc
(Pit)Groove
Land

2. Disc Specification

ITEM
Standard
Record
Tracking Signal I11/Itop
(HF Modulation)
Read Laser Power(mW)
Jitter
Reflectivity (R
Remark)
Write Laser Power(mW)
0.4~0.5 um
CD-ROM
Yellow Book
Not available
> 0.6
< 0.5 mW
< 35 nsec
)
70 %
top
Track pitch(p)
A
Iw
O
a
Groove
Land
a
CD-R
Orange Book II
Write once
> 0.6
< 0.7 mW
< 35 nsec
65 %
14-65 mW
a=30nm
Radial Direction
Radial Error Signal
Average center
Actual center
The Groove wobble
CD-RW
Orange Book III
Re-Writeable
0.55 > M
> 0.70
11
< 1.0 mW
< 35 nsec
15 % ~ 25 %
6-45 mW
25

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