Blu-ray disc is a next-generation optical disc format that can store high-definition video and large amounts of data using blue laser technology. It was developed as an alternative to HD DVD and offers over 5 times the storage capacity of DVDs, with single-layer discs holding up to 25GB and dual-layer up to 50GB. A consortium called the Blu-ray Disc Association was formed in 2002 by major tech companies to develop the format standard. Blu-ray uses a blue-violet laser with a shorter wavelength than DVD to achieve higher resolution and data capacity for storing HD video.

1. BLU-RAY DISC
By :pradeep Reddy

2. CD DVD BLU-RAY

3. INTRODUCTION
Blu-ray, also known as Blu-ray Disc (BD) is the
name of a next-generation optical disc format.
The format was developed to enable recording,
rewriting and playback of high-definition video
(HD), as well as storing large amounts of data.
The format offers more than five times the
storage capacity of traditional DVDs and can
hold up to 25GB on a single-layer disc and 50GB
on a dual-layer disc.

4. Foundation
Blu-ray disc (BD) is appropriately named after the
blue laser used to write the data
The first blue laser was developed in 1996 by Shuji
Nakamura (Nichia Corporation)
In 2002, an alliance was formed, called the Blu-ray
Disc Association, including the likes of Sony,
Samsung, Sharp, Hewlett-Packard, and Royal
Phillips.
It has One layer, Two layer, Three layer, Four layer
Five layer, Six layer.

5. Variations and Sizes
A single-layer Blu-ray disc (BD) has enough
storage capacity (25GB) for approximately two
hours of high-definition video with audio.
A dual-layer (50GB) BD can hold enough data
for approximately four hours of HD video.
TDK recently announced that they have created
a working Blu-ray disc capable of holding 200GB
of data (six 33GB data layers).

6. HISTORY

7. Laser and optics
Blu-ray systems use a blue-violet laser operating at a
wavelength of 405 nm, similar to the one used for HD
DVD, to read and write data. Conventional DVDs and
CDs use red and infrared lasers at 650 nm and 780
nm respectively.
Blu-ray has two types BD-R and BD-RE with price
$19.99 and $24.99 for 25GB and $47.99 and $59.99
for 50GB respectively.

9. Why Blue Lasers?
High-definition TV provides six times more
picture information than standard-definition
TV
More bits per second required
More gigabytes per disc required
1920 x 1080 x 30 = 62 million pixels/second
720 x 480 x 30 = 10 million pixels/second
HDTV
SDTV

10. Disc Characteristics
Single layer: 25 GB
Dual layer: 50 GB
Diameter: 120 mm
Thickness: 1.2 mm
Center hole
diameter: 15 mm
Uses GaN laser of
wavelength 400 nm
The smaller laser,
compared to the
DVD and CD, keeps
the process more
efficient (~5 mW) Courtesy Blu-ray Disc Founders “Blu-ray Disc Format White Paper”

11. Hard-coating technology
In January 2004 was
introduced a clear polymer
coating that gives Blu-ray
Discs unprecedented
scratch resistance. The
coating was developed by
TDK Corporation and is
called "Durabis". It allows
BDs to be cleaned safely
with only a tissue.

12. Blu-ray vs DVD capacity

13. CD vs DVD vs Blu-ray writing

14. Compatibility
This issue has introduced a competitor, the HD-DVD,
that based its technology around being compatible with
the DVD
Recently the BDA has developed recorders that are
BD/DVD/CD compatible
JVC has advanced the BD by developing a BD/DVD
combo disc that stores both DVD and BD data. It is
composed of two DVD layers and a third BD layer
storing 33.5 GB total

15. Blu-ray Advantages
Record high-definition television (HDTV) without
any quality loss
Instantly skip to any spot on the disc
Record one program while watching another on
the disc
Edit or reorder programs recorded on the disc
Automatically search for an empty space on the
disc

16. Future
Expect the BD to become more prevalent once the
HDTV market establishes its presence
Audio and video will reach higher qualities with
larger storage space
Look for BD with more than two layers as the
technology is further refined

17. Conclusion
Both DVD and BD would most likely co-exist for
quiet some time until HDTVs become more
widespread.

18. QUESTIONARE

19. Thank you