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Blu Ray Disc

Published on September 2018 | Categories: Documents | Downloads: 9 | Comments: 0
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By:

Himanshu Negi

DEFINITION 

Blu-ray Disc (also known as Bluray or BD) is an storage medium designed to supersede the standard DVD format A single Blu-ray Disc can store upto 25 GB of data on a single layered disc and upto 50 GB of data on a doubled layered disc.

HISTORY   1st

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  2nd

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

HISTORY   3rd

GENERATION

Blu-ray disc(BD): --- 25/50 GB - Next generation optical disc format. - Developed by blu-ray disc association(which includes Apple, Hitachi, HP, 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

DEVELOPER OF BLU-RAY  DISC 

Blu-ray, also known as Blu-ray Disc (BD), is

 jointly developed by the Blu-ray Disc Association (BDA),  A group of the world's leading consumer electronics, personal computer and media manufacturers.  There are more than 180 member companies from all over the world.

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

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.

DOUBLE SIDED & DUAL LAYER A

doubled sided disc is one which has data layer on both the surfaces of the disc.We have to turn over the disc to access the second surface.  A dual layer disc is one in which there are two data layer on the same surface of the disc.  For

better writing the speed of the writer should be less.

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

PITS

COMPARISON IN THE BEAM SIZE

BENEFIT OF BLUE LASER  The

Blu-ray Disc uses a blue laser for reading or writing the data.  CDs and DVDs on the other hand use a red laser for this purpose.  The wavelength of the blue laser is smaller than the red laser.  This allows the lens to focus the laser spot with great precision.  Due to which the data can be packed more tightly and stored in small space.  Thus a BD stores more data than DVD even

BLU RAY`S DURABILITY  ADVANTAGE 

Various hard coating technologies make Blu 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)

FEATURES OF BD With BD we can:  Record

HDTV without any quality loss.  Instantly skip to any spot on disk.  Record one program while watching other on the disc.  Edit programs recorded on disc.  Automatically search for an empty space on the disc to avoid recording over a program.

BLU-RAY DENSITY  ADVANTAGE  High

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.

LIFE OF A BLU-RAY DISC  According

to the manufacturers once the information is written to a Blu-ray Disc it remains readable for 30 to 200 years.  Since the data is stored compactly in a BD, a small scratch may result in great losses of data.  A BD uses hard coating technology so as to protect it from the scratches.

MERITS  Large

amount of data can be stored on a single disc.  Data can be stored safely for many years.  Blu-ray supports High Definition video which increases the picture quality.  Comes with a hard coating technology so it is scratch resistance.

DEMERITS  We

require a separate Blu-ray Disc player for using Blu-ray Disc.  The cost of the Blu-ray Disc is very high at present.  If we store less data a lot of space will be left unused.

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.

APPLICATIONS Blu-ray Disc can be used in every field. It can be used for:  Storing official documents.  Storing huge files.  Storing HD video.  Storing computer softwares.

DO MORE WHTH BLU …  More

capacity , density and performance  More industry support/ consumer reach(BDA has 140+ members)  More durable  More interactive User Experience

THANK YOU

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