High-definition DVD (HD DVD) is a high-density optical disc format that was developed for storing high-definition video. It uses a blue-violet laser instead of red to allow for smaller pits and a higher density, enabling 15GB on a single-layer disc or 30GB on a dual-layer disc. While similar in design to existing DVDs, HD DVDs use a shorter wavelength laser to fit more tracks and store HD content. The format was developed by Toshiba and NEC to provide consumers with high-quality HD content, but eventually lost the format war to the Blu-ray disc format.

1. Shashwat Shriparv
dwivedishashwat@gmail.com
InfinitySoft

2. High Definifon DVD(HDDVD)
It is the next generation DVD developed by
TOSHIBA & NEC.
 The disc has a capacity of 15GB in single
layer,&
30GB capacity in dual layer.
The technology used in HDDVD is almost
similar
to the existing CD,DVD technology.

3. • CD
The CD ROM was introduced in 1982,The storage
capacity of a CD is almost 650MB.CD’s are of
different type ROM,R,RW.
The disc is of 1.2mm thickness & 120mm diameter
.it consists of polycarbonate substrates, a
reflective layer ,a data storage layer.
The data is stored as 1’s& 0’s,In conventional CDs,
these 1s and 0s are represented by millions of pits
s and land.
 The discs are read using red lasers( 780nm
wavelenth)
 Data is encoded in the CD's in acontinuous
spiraltrack, from the inside to the outside, about 1.6
to 2.2microns wide (a micron is 1/1000 of a

4. technology : read
The pits and smooth areas (the smooth areas are
called lands) are read by a laser when the disc is
played.
 Pits and lands reflect the light from the laser
differently,
and that difference is encoded as binary data: the
light
hitting a land reflects back directly to a photodiode,
whichgenerates an electrical pulse, while the light
hitting a pit is refracted (deflected from a straight
path, or scattered),and, consequently, reduced
below the level needed to activate the photodiode.

5. write
a layer of organic polymer dye between
the polycarbonate and metal layers
serves as the recording medium.
Thecomposition of the dye is permanently
transformed by exposure to a specific
frequency of light.
While in the rotation by making the laser
ON or OFF the the data is writing.

6. DVD
DVD is a relatively new optical disc technology that
uses denser recording techniques
The original DVD format was launched in Japan in
1996.
A DVD is very similar to a CD, but it has a much
larger data capacity. A standard DVD holds about
seven times more data than a CD does(4.7GB).
The original purpose of DVD was to hold video data
in particular - DVD once was said to stand for Digital
Video Disk. However, as the number of DVD
applications grew, the variety of data stored on
DVD

7. Basic technology
The wave length of the laser beam used to read
the DVD disc is shorter than that used for
standard CDs
ie,650nm wavelenth.
 There are more tracks per disc on DVDs,
because they are placed closer together than on
CDs. The track pitch has been reduced to 0.74
microns.
Data pits are considerably smaller, which allows a
greater number per track than on CDs.

9. specterum

10. HD DVD(High Definition DVD)
The HD-DVD format, developed and proposed by
Toshiba & NEC was introduced to the DVD Forum in
November of 2003 and approved as the next-
generation DVD format.
It was developed to store highdefintion videos to get
its full effect for HDTV.
This is the only high definition format which is
approved
by the DVD forum

11. comparison

12. In HDDVD we are using Blue Violet laser
(405nm) thus reducing the track pitch to 0.4
microns, Which increases the data capacity. The
size of the pits is also reduced.
It holds a data rate of maximum 36.55 Mbps.

14. Blue Violet Laser
Shuji Nakamura, a Japanese
researcher working in a small
chemical company, Nichia
Chemical Industries, built the first
blue laser diode.
This uses the GaN(gallium nitride)
, in the earlier time blue lasers
were large and expensive gas
laser instruments and needed high
currents and strong cooling.

15. Basic structure

16. The disc of diameter 12cm & thickness
1.2mm
The disc contains polycarbonate subtrate
layer in both sides .
There’s one reflective layer made of
alumnium.
& a protective layer of lacquer
The recording layer is of organic dye, is
highly sensitive to blue laser light, has the
uncompromised readout stability essential
for practical use.

17. Types of HDDVD
HDDVD-ROM
HDDVD-R
HDDVD-RW

18.  Single Layer HDDVD(15GB)
 Dual Layer HDDVD(30GB)
 Triple Layer HDDVD(45GB)

20. Dual layer HDDVD
DVD media has two dye layers for data recording.
Each dye layer is separated by a spacer and a
metal reflector.
 The first reflector (positioned after the first dye
layer) is semi-transparent; when the laser is
focused a certain way, it will pass through this
reflector and continue through to the second dye
layer and can read the data
in the second dye layer.
The second reflector is completely opaque and will

23. opportunity
 High Definition Media.
 Mass storage disc.

24. Appetite For HD Content Increasing
 HDTV
Gap between “US HDTV households” (US HHs) and current
cable/satellite offerings is great market opportunity
6.1 10.0 15.7 23.3 32.5 41.9 50.4 57.3
0
10
20
30
40
2003 2004 2005 2006 2007 2008 2009 2010
US
HHs
(MMs)
HD Dig Cable
HD Satellite
Source: Forrester Research – HDTV & the Coming Bandwidth Crunch, 2/17/2005
US HHs

25. HDDVD in high definition
media
HDDVD helps to view the high definition
movies in its full effect.
It supports all the high definition formats such
as MPEG-2,VC-1,MPEG-4,AVC.MPEG-2
needs 19.3Mbps. It can give up to data rate
36.55Mbps.
It supports video formats up to 1080i,1080p.
 &HDTV video resolution 1920-1080.

26. High definition images offer a considerably richer colour palette with greater subtlety of colour transition
and enhanced contrast. The result is greater precision, incredible detail and breathtaking realism.

27. advantages
Cheaper to produce in the short term when
compare to blueray.
The only high definition format approved by the
DVD forum.
The name itself, HD-DVD, is more consumer-
friendly
HD-DVDs carry the same basic structure as
current DVDs, so converting existing DVD
manufacturing lines into HD-DVD lines is
supposedly simple.
Backed by Microsoft.

28. disadvantages
 HD-DVD simply can't boast the same
storage capacity as Blu-ray.
 HDDVD did not have the Hard coating .

29. SD-H802A SD-H903A

30. SD-L912A SD-L902A

31. HD-A2

32. Strong Industry Support

33. Strong Studio Support

34. Shashwat Shriparv
dwivedishashwat@gmail.com
InfinitySoft