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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 Dual Layer : 8.5GByte
Label Label
Polycarbonate Polycarbonate
Reflective layer
Bonding layer
Bonding layer
Reflective layer Semi-reflective layer
Polycarbonate Polycarbonate
Dual Side Single Layer : 9.5GByte Dual Side Dual Layer : 17GByte
Polycarbonate Polycarbonate
Semi-reflective layer
Reflective layer Reflective layer
Bonding layer Bonding layer
Reflective layer
Reflective layer Semi-reflective layer
Polycarbonate Polycarbonate
Samsung Electronics 14-1
Reference Information
14-1-2 DVD Types
FORMAT TYPE APPLICATIONS
DVD-Video Playback Only High quality image and sound for movies and other video media.
DVD-ROM Read Only Multi-functional, multi-media software that requires large storage capacity.
DVD-Audio Playback Only High quality sound that exceeds the CD, multi-channel Audio.
DVD-R 1 Time Recording As with CD-R, write only once
Rewritable This can be virtually used as hard-disk, with a random
DVD-RAM
(more than 100,000 times) read-write access
Rewritable Similar to DVD-RAM except than its technology features
DVD-RW
(About 1,000 times) a separated read-write access more like phonograph than a hard disk.
14-2 Samsung Electronics
Reference Information
14-2 DVD-Video Format
14-2-1 Main Features
1) Able to store up to 160 minutes of Movie by utilizing the MPEG-2 compression technology. ( Aver. 133min.)
2) Enables more than 500 lines of horizontal resolution. (Class corresponding to the Master Tapes used in
broadcasting stations)
3) Provides Dolby Digital 5.1ch Surround 3D sound, which enables theater quality sound (NTSC area).