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Bluray Disc

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  • 1. BLU-RAY DISC By:Junaid Hakeem

2. HISTORY

  • 1 stGENERATION:
  • Compact disc (CD):---650/700 MB
  • It is with us for over 20 years.
  • Wavelength of laser which reads data: 780 nm
  • Color of laser:Red
  • 2 ndGENERATION:
  • Digital versatile disc (DVD): ---4.7 GB
  • It offers high quality sound and video than CD.
  • Wavelength of laser which reads data: 650 nm
  • Color of laser:Red

3. HISTORY

  • 3 rd GENERATION :
  • Blu-ray disc (BD): ---25/50 GB
  • -Next generation optical disc format.
  • -Developed by blu-ray disc association (which includes Apple, Hitachi, HP, LG, Panasonic, Pioneer, Philips, Samsung, Sharp, Sony)
  • -Wavelength of laser which reads data:405 nm
  • -Color of laser:Blue-violetwhich was developed by
  • SHUJINAKAMURA
  • atNICHIACORPORATION

4. FORMATOFBD

  • It comes in four different formats :
  • BD-ROM (read only) :for reading recorded content.
  • BD-R(recordable) :for PC data storage.
  • BD-RW(rewritable) :for PC data storage.
  • BD-RE(rewritable) :for HDTV (high definition television) recording.

5. TYPESOFBD:

  • SINGLE LAYER:
  • Can hold data up to 25/27 GB that means 2 hrs of HD video or about 13 hrs of standard video.
  • DOUBLE LAYER:
  • Can hold data up to 50 GB that means 4.5 hrs of HD video or more than 20 hrs of standard video.

6. THE TECHNOLOGY

  • Pits: spiral grooves that run from the centre of the disc to its edges
  • Bumps: other sides of these edges.
  • Track pitch: it is the distance between the two tracks (of pits) on the surface.
  • --------------------------------
  • Disc store digitally encoded data in PITS.
  • --------------------------------

7. THE TECHNOLOGY

  • So, in blu-ray disc:
  • Pit size 0.15microns( more than twiceas small as the pits on DVD )
  • Track-pitch is: 0.32microns
  • Laser needed:blue-violet laser (405 nm)
  • Data transfer rate: 36Mbps

8. 9. 10. 11. COMPARISON IN BUILDING BD AND DVD

  • BD
  • Data is placed on top of a 1.1 mm thick polycarbonate layer
  • Doesnt suffer fromBIREFRINGENCE
  • Doesnt suffer fromDISC TILT
  • Hard coating is placed outside to protect from scratches or fingerprints
  • DVD
  • Data is sandwiched b/w two polycarbonate layers, each 0.6 mm thick
  • Suffer fromBIREFRINGENCE
  • Suffer fromDISC TILT
  • No such hard coating is placed

12. BLU RAY SDURABILITY ADVANTAGE

  • Various hard coating technologies make Bly ray disc most durable and family -friendly
  • Hard-coating technology provides resistance to:
  • - Finger prints
  • - Marks
  • - Scratches
  • - Dust
  • Much more ROBUST than todays polycarbonate-based CD/DVDs (and HD DVDs)

13. FEATURES OF BD

  • With BD we can:
  • Record HDTV without any quality loss
  • Instantly skip to any spot on disc
  • Record one program while watching other on the disc
  • Create playlists
  • Edit or reorder programs recorded on disc
  • Automatically search for an empty space on the disc to avoid recording over a program
  • Access to web to download subtitles and other extra features
  • And many more

14. BLY-RAYS DENSITY ADVANTAGE

  • Higher density enables better data seek times
  • Shorter to travel for same amount of data results in faster data seek
  • Better for random access of data

15. THE NAME

  • The blu-ray name is a combination of blue, for the color of the laser that is used and ray for optical ray.
  • The e in blue was purposefully left off, according to the manufacturers, because an everyday word cannot be a trademark.

16. On GAURD

  • Blu-ray discs are better armed than current DVDs. They come equipped with a secure encryption system a unique ID that protects against video piracy and copyright infringement.

17. 18. 19. 20. DO MORE WITH BLU

  • More capacity, Density and Performance
  • More Industry Support/Consumer Reach (BDA has 140+ members)
  • More Durable
  • More Interactive User Experience
  • More Flexible Content Protection: AAC, BD+ Renewability Technology and ROM Mark

21. Thank You