Bluray Disc

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  • 1. BLU-RAY DISC By : Junaid Hakeem
  • 2. HISTORY
    • 1 st GENERATION:
    • 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 nd GENERATION:
    • 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-violet which was developed by
    • SHUJI NAKAMURA
    • at NICHIA CORPORATION
  • 4. FORMAT OF BD
    • 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. TYPES OF BD:
    • 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 – 0.15 microns ( more than twice as small as the pits on DVD )
    • Track-pitch is : 0.32 microns
    • Laser needed : blue-violet laser (405 nm)
    • Data transfer rate : 36 Mbps
  • 8.  
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  • 11. COMPARISON IN BUILDING BD AND DVD
    • BD
    • Data is placed on top of a 1.1 mm thick polycarbonate layer
    • Doesn’t suffer from BIREFRINGENCE
    • Doesn’t suffer from DISC 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 from BIREFRINGENCE
    • Suffer from DISC TILT
    • No such hard coating is placed
  • 12. BLU RAY ‘S DURABILITY 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 today’s polycarbonate-based CD/DVD’s (and HD DVD’s)
  • 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-RAY’S 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 DVD’s. They come equipped with a secure encryption system– a unique ID that protects against video piracy and copyright infringement.
  • 17.  
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  • 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