Samsung DVD-P355B/XEV Reference Information, Bonding layer Semi-reflective layer Polycarbonate

14. Reference Information

14-1 Introduction to DVD

14-1-1 The Definition of DVD

DVD is the next generation medium and is the acronym of the Digital Versatile Disc or thr Digital Video Disc, which maximizes the saving density of the disk surface using the MPEG-2 compression technology to enable the storage of 17G bytes of data on the same size CD.

1) 7 times the storage capacity of the conventional CD

•Minimized the track pitch and pit size to 1/2 of conventional CD.

•Uses red laser with short-wavelenght of 650nm (635nm).

•DVD Vs. CD-ROM

	CD-ROM	CD-R/RW	DVD-ROM	DVD-R/RW	DVD-RAM
Disc Thickness	1.2mm	1.2mm	0.6*2mm	0.6*2mm	0.6*2mm
Lens NA	0.45	0.45(0.5)	0.6	0.6	0.6
Laser wavelenght	780um	780um	650um	650um	650um
Track pitch	1.6pm	1.6pm	0.74pm	0.74pm	0.615pm
Capacity	0.65GB	0.65GB	4.7GB	4.7GB	4.7GB
Track structure	Pit train	Groove	Pit train	Groove	Land/Groove

2)Disc Formats

DVD consists of two 0.6mm discs attached together, enabling access to the upper and lower side of the disk, and 4 sides could be used at maximum.

Single Layer : 4.7GByte Label Polycarbonate Bonding layer Reflective layer Polycarbonate

Dual Side Single Layer : 9.5GByte Polycarbonate Reflective layer Bonding layer Reflective layer Polycarbonate

Dual Layer : 8.5GByte

Label

Polycarbonate

Reflective layer

Bonding layer

Semi-reflective layer

Polycarbonate

Dual Side Dual Layer : 17GByte

Polycarbonate

Semi-reflective layer

Reflective layer

Bonding layer

Reflective layer

Semi-reflective layer

Polycarbonate

Samsung Electronics 14-1