BLU-RAY DISCBy : Junaid Hakeem

HISTORY

1 st GENERATION:Compact disc (CD): --- 650/700 MBIt is with us for over 20 years.Wavelength of laser which reads data: 780 nmColor of laser: Red 2 nd GENERATION:Digital versatile disc (DVD): --- 4.7 GBIt offers high quality sound and video than CD.Wavelength of laser which reads data: 650 nmColor of laser: Red

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

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.

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.

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.--------------------------------

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 micronsLaser needed : blue-violet

laser (405 nm)Data transfer rate : 36 Mbps

COMPARISON IN BUILDING COMPARISON IN BUILDING BD AND DVDBD 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

BLU RAY ‘S DURABILITY BLU RAY ‘S DURABILITY ADVANTAGEADVANTAGE

Various hard coating technologies make Bly ray Various hard coating technologies make Bly ray disc most durable and family -friendly”disc most durable and family -friendly”

Hard-coating technology provides resistance to:Hard-coating technology provides resistance to:

- Finger prints- Finger prints

- Marks- Marks

- Scratches- Scratches

- Dust- Dust Much more ROBUST than today’s Much more ROBUST than today’s

polycarbonate-based CD/DVD’s (and HD DVD’s)polycarbonate-based CD/DVD’s (and HD DVD’s)

FEATURES OF BDFEATURES OF BDWith 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…

BLY-RAY’S DENSITY BLY-RAY’S DENSITY ADVANTAGEADVANTAGE

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

THE NAMETHE NAMEThe 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.

On GAURDOn 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.

DO MORE WITH BLU…DO MORE WITH BLU…More capacity, Density and

PerformanceMore Industry Support/Consumer

Reach (BDA has 140+ members)More DurableMore Interactive User ExperienceMore Flexible Content Protection:

AAC, BD+ Renewability Technology and ROM Mark

Thank YouThank You