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.
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
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
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
Can hold data up to 25/27 GB that means 2 hrs of HD video or about 13 hrs of standard video. DOUBLE
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
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.
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.
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.
“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