Blu-ray Disc is a next-generation optical disc format that can store high-definition video and large amounts of data using a blue-violet laser. The name comes from the blue-violet laser used and the small pit size of 0.15 microns allows for higher density data storage than DVDs. Blu-ray Discs use a hard coating to protect the data layer and make them more durable than CDs and DVDs. The increased data capacity and smaller laser wavelength allow Blu-ray Discs to store around 5 to 10 times more data than DVDs.

2. BLU- RAY DISC PREPARED BY -DEEPALI RATHOD

4. HISTORY 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. The name Blu-ray is derived from the Underlying technology, which utilizes a blue-violet laser to read and write data

5. HISTORY 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.

6. FORMATS OF BD

7. TYPES OF BD

11. STRUCTURE OF BLU-RAY DISC SO IN BLU-RAY DISC PIT SIZE -0.15 MICRONS (MORE THAN TWISE AS SMALL AS THE PITS ON DVD. TRACK-PITCH IS 0.32 MICRONS Laser needed : blue-violet laser (405 nm) Data transfer rate: 36Mbps

12. CD VS. DVD VS. BD BD (3RD GENERATION) DVD (2ND GENERATION) CD (1ST GENERATION)

13. 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

14. CD VS. DVD VS. BD

16. Doesn’t suffer from BIREFRINGENCE

17. Doesn’t suffer from DISC TILT

18. Hard coating is placed outside to protect from scratches or fingerprints

19. Data is sandwiched b/w two polycarbonate layers, each 0.6 mm thick

20. Suffer from BIREFRINGENCE

21. Suffer from DISC TILT

24. Instantly skip to any spot on disc

25. Record one program while watching other on the disc

26. Create playlists

27. Edit or reorder programs recorded on disc

28. Automatically search for an empty space on the disc to avoid recording over a program