In this presentation, I have mentioned that what is CD (Compact Disk) and What is DVD. How data stores into it. And How it manufactures. And Difference between them.

1. Data Storage Device
CD & DVD
Prepared By:-
Jerin Chacko
Vyas Pratik
AP

2. Index
• 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 commercially
available from October 1982 By Philips
• The VCD standard was created in 1993 by Sony, Philips,
Matsushita.

4.  MANUFACTURING OF CD/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 partially reflecting
 Increase to 8.5 GB (2 sided), 17 GB (2 levels, 2 sided)

9.  Two levels of DVD

10.  Diffrence
CD DVD
Capacity: 700 MB Capacity: 4.7 GB
Data Tran. Rate: 1.4-1.6
MB/Sec
Data Tran. Rate: 11 MB/Sec
Pits Length: 0.83 Micron Pits Length: 0.4 Micron
Distance b/w Disc Sur.-Data
Sur: 1.1mm
Distance b/w Disc Sur.-Data
Sur: 0.6mm
Disc Thickness: 1.2 mm Disc Thickness: 1.2 mm

11. Note:-
This is the Optic
which help to write data
on CD/DVD

12. 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)
 Problem is lifetime of Blue laser approaching
1000 hrs

13.  HD-DVD v/s Blue Ray DVD
• Next generation DVD format has two competitors
• HD-DVD: Toshiba, NEC, Microsoft, entertainment industry
• Blue Ray (BD): Sony, Hatachi, 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%

15. REFERENCE SITES:-
WWW.WIKIPEDIA.ORG
WWW.DIGICOM.COM

16. THANK YOU….