bluray disc ppt by dhruv2 1222350645931113 9

BLU-RAY DISC
Submitted To: Er. Kavi Bhushan
Submitted By :AVINASH SINGH
B.tech(cs) VIth sem.
Roll no.: 097111

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, 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 microns Laser needed : blueviolet laser (405 nm)
Data transfer rate : 36
Mbps

COMPARISON IN
BUILDING BD AND DVD
BD

DVD

 Data is placed on top of a
1.1 mm thick polycarbonate layer

 Data is sandwiched b/w two polycarbonate