sample ppt- Subject Introduction (1).pptx
- 1. 05-03-2019 1 Name: Shubham rai Sub : CHS 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 commercially available from October 1982 By Philips • The VCD standard was created in 1993 by Sony, philips, Matsushita.
- 4. MANUFACTURING OF CD/DVD It involves creation of a glass master that is placed onto a stamper which is then injected into a mold (shape of a disc) made from polycarbonate substrates. Data is then permanently stamped or "pressed" onto the CD or DVD and the end result is a fully manufactured disc that is playable across multiple platforms.
- 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. 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) ● Problem is lifetime of Blue laser approaching 1000 hrs
- 11. 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%. ● 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….