LG Electronics GSA-4165B The differences of CD-R/CD-RW discs and General CD-ROM, Recording Layer

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.

CD-ROM (READ-ONLY DISC)

.6um

1

3~11T

0.4~0.5 um

CD-R and CD-RW Disc

(Pit)Groove

Land

	Track pitch(p)	a=30nm
	A
	Iw
	O
	a	Radial Direction
		Radial Error Signal
Land	Groove
	a
		Average center
		Actual center
		The Groove wobble

2. Disc Specification

ITEM	CD-ROM	CD-R	CD-RW
Standard	Yellow Book	Orange Book II	Orange Book III
Record	Not available	Write once	Re-Writeable
Tracking Signal I11/Itop	> 0.6	> 0.6	0.55 > M11> 0.70
(HF Modulation)
Read Laser Power(mW)	< 0.5 mW	< 0.7 mW	< 1.0 mW
Jitter	< 35 nsec	< 35 nsec	< 35 nsec
Reflectivity (Rtop)	70 %	65 %	15 % ~ 25 %
Remark) Write Laser Power(mW)		14-65 mW	6-45 mW

20