CB and dvd

1. 05-03-2019 1
Name: Shubham rai
Sub : CS
Enrollment No.
9 2 2 0 0 9 3 8 1 8 9
Class: DCE-3
Topic : CD AND DVD

2. Contents
• History
• Manufacturing
• Types
• Difference between CD & DVD
• Limits the Data on a CD/DVD
• HD-DVD v/s Blue Ray DVD

3. History
• First public demonstration of CD is in 1976 By Sony.
• High Quality Audio CDs have been coming in
October 1982 By Philips
• The VCD standard was created in 1993 by Sony,
philips.

4. MANUFACTURING OF CD/DVD
Take a glass master that is placed into a
stamper which is the injected into a mold (
shape of a disc ) made from polycarbonate
matertial are use for making CD and DVD.

5. Types
• CD (Compact Disc)
• DVD (Digital Video Disc)
• HD-DVD (High Defination – Digital Video Disc)
• BD (Blue ray Disc)

6. CD
• 12 cm disk with plastics substrate, aluminum
coating and plastic cover
• 0.83 micron wide pits, 1.6 micron spacing
• Data storage capacity 700 MB

7. Overall CD

8. DVD
● 12 cm disk with plastics substrate, aluminum coating and
plastic cover
● 0.4 micron wide pits, 1.2 micron spacing Data storage
capacity 4.7 GB
● Two sided, 2 levels/side top level reflecting
● Increase to 8.5 GB (2 sided), 17 GB (2 levels, 2 sided)

9. Diffrence

10. Limits the Data on a CD/DVD
● Each pit is one “bit” (0 or 1) of data
● How fast the CD turns (1.4 m/sec for single
speed)
● Rotation speed limit: about 52x (72.8 m/sec)
● Lifetime of Blue laser 1000 hrs

11. HD-DVD v/s Blue Ray DVD
● HD-DVD: Toshiba, NEC, Microsoft, entertainment industry.
● Blue Ray (BD): Sony, Panisonic, Apple etc .
● Blue Ray higher capacity (25 GB) vs HD (15 GB) .
● Hence shorter pits: Blue ray 0.16 μm, HD 0.205 μm .
● Problem is that Blue ray is much nearer the surface (0.1 mm) .
● Blue ray can have 8 layers, up to 200 GB, HD 4 layers, 60 GB.
● Sept 2008 Blue ray only 8% of market, DVD 92%.
● Blu-ray has a double layer storage size of 50 GB. While HD
DVD has a double layer storage size of 30 GB.

13. THANK YOU….