An optical disc storage medium
Used to store HD Videos
Developed by Blu-ray Disc Association
Utilizes blue-violet LASER to Read & Write
DISC FORMATSCODECSRECORDINGVIDEO QUALITYCAPACITY
supports 1920x1080 resolut ion
and progress ive refreshing of a l l l ines on the screen ( i e 1 0 8 0 p )
maximum video b i t rate of 40MBps ( w h i c h i s m o re t h a n 4 t i m e s f a s t e r t h a n a DV D ' s )
BD ROM - commercial movies and software
BD R - Single recording of Data or Video
BD RE - Rewritable recording
BD/DVD hybrid formats playable in both DVD and Blu-ray players
Recording speed : 1x defined as 36 MBps 2x = 72 MBps
Potential for much higher speeds because of large Numerical Aperture NA. (upto 288 MBps)
Large NA value means less recording power and lower disc RPM
Single-layer Disc : 25 GB Dual-layer disc : 50 GB
Potential for addition of more layers (25 GB per layer)
a 50 GB disc can hold upto 9 hours of HD video --or-- 23 hours of Standard video
Video Codecs :MPEG-2
MPEG-4 AVC SMPTE VC-1
Audio Codecs :Linear PCMDolby Digital Dolby Digital PlusDTS Digital SurroundDTS-HD High Resolution
Audio
1st generetion audio
700 MB storage space
1x: 1.2 MBps
wavelength of LASER : 780 nm
Numerical Aperture : 0.45
1.2 mm substrate
track pitch : 1.6 um
2nd generetion SD Video
4.7 GB storage space
1x: 11 MBps
wavelength of LASER : 650 nm
Numerical Aperture : 0.60
0.6 mm substrate
track pitch : 0.74 um
3rd generetion HD Video
25 GB storage space
1x: 36 MBps
wavelength of LASER : 405 nm
Numerical Aperture : 0.85
0.1 mm substrate
track pitch : 0.30 um
DOUBTS…??