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BLU- RAY DISC
PREPARED BY-DEEPALI RATHOD
HISTORY
FORMAT OF BLU RAY DISC
TYPES OF BLU RAY DISC
ADVANTAGES OF BLU RAY TECHNOLOGY
STRUCTURE OF BLU RAY DISC
DIFFERENCE BETWEEN CD, DVD & BD
CONCLUSION
BLU-RAY, ALSO KNOWN AS BLU-RAY DISC (BD) IS THE NAME OF A NEXT-GENERATION OPTICAL DISC FORMAT.
DEVELOPED TO ENABLE RECORDING, REWRITING AND PLAYBACK OF HIGH-DEFINITION VIDEO (HD), AS WELL AS STORING LARGE AMOUNTS OF DATA.
HISTORY
THE NAME BLU-RAY IS DERIVED FROM THE UNDERLYING TECHNOLOGY, WHICH UTILIZES A BLUE-VIOLET LASER TO READ AND WRITE DATA
THE NAME IS A COMBINATION OF "BLUE" (BLUE-VIOLET LASER) AND "RAY" (OPTICAL RAY)
ACCORDING TO THE BLU-RAY DISC ASSOCIATION IN THE SPELLING OF "BLU-RAY“,THE CHARACTER "E" WAS INTENTIONALLY LEFT OUT SO THE TERM COULD BE REGISTERED AS A TRADEMARK.
HISTORY
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) FOR RECORDING.
FORMATS 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
TYPES OF BD
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)
BLUE RAY’S DURATBILITY ADVANTAGE
STRUCTURE OF BLU-RAY DISC
PITS : DISCS STORE DIGITALLY ENCODED VIDEO AND AUDIO INFORMATION IN PITS – SPIRAL GROOVES THAT RUN FROM THE CENTER OF THE DISC TO ITS EDGES. LASER: A LASER READS THE OTHER SIDE OF THESE PITS
TRACK PITCH : IT IS THE DISTANCE BETWEEN TWO TRACKS(OF PITS) ON THE SURFACE.
PIT SIZE -0.15 MICRONS (MORE THAN TWISE AS SMALL AS THE PITS ON DVD.
TRACK-PITCH IS 0.32 MICRONS
SO IN BLU-RAY DISC
LASER NEEDED : BLUE-VIOLET LASER (405 NM)
DATA TRANSFER RATE: 36MBPS
STRUCTURE OF BLU-RAY DISC
1) 4.7 GB2) HIGH QUALITY A/V THAN CD.3) WAVELENGTH OF LASER WHICH READS DATA: 650 NM4) COLOR OF LASER: RED
1) 25/50 GB2) NEXT GENERATION OPTICAL DISC FORMAT3) WAVELENGTH OF LASER WHICH READS DATA:405 NM4) COLOR OF LASER: BLUE
CD(1ST GENERATION)
BD(3RD GENERATION)
DVD(2ND GENERATION)
CD VS. DVD VS. BD
CD VS. DVD VS. BD
BD DISC WILL INCREASE DVD CAPACITY BY 5 TO 10 TIMES.
USAGE OF A BLUE INSTEAD OF A RED LASER IMPROVE LENS SPECIFICATIONS, ALLOWING FOR A MUCH SMALLER FOCUS LASER BEAM WHICH ENABLES THE RECORDING OF MUCH SMALLER AND
HIGHER DENSITY PITS ON THE DISC
CD VS. DVD VS. 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
DATA IS SANDWICHED B/W TWO POLYCARBONATE LAYERS, EACH 0.6 MM THICK
SUFFER FROM BIREFRINGENCE
SUFFER FROM DISC TILT
NO HARD COATING IS PLACED
COMPARISION IN BUILDING DVD VS. BD
BDDVD
BECAUSE BLU-RAY USES A BLUE LASER(405 NANOMETERS) INSTEAD OF A RED LASER(650 NANOMETERS) THIS ALLOWS THE DATA TRACKS ON THE DISC TO BE VERY COMPACT.
RECORD HDTV WITHOUT ANY QUALITY LOSSINSTANTLY SKIP TO ANY SPOT ON DISCRECORD ONE PROGRAM WHILE WATCHING OTHER
ON THE DISCCREATE PLAYLISTSEDIT OR REORDER PROGRAMS RECORDED ON DISCAUTOMATICALLY SEARCH FOR AN EMPTY SPACE ON
THE DISC TO AVOID RECORDING OVER A PROGRAMACCESS THE WEB TO DOWNLOAD SUBTITLES AND
OTHER EXTRA FEATURES
CONCLUSION
