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HD DVD, HD DVD Media, HD DVD Blank Discs |
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Based
on DVD technology
DVD and HD DVD share the same basic disc structure: back-to-back bonding
of two 120mm diameter substrates, each 0.6mm thick. As a result, HD DVD
combines advanced capabilities with essential backward compatibility.
The HD DVD standard clearly promotes early and cost efficient disc and
hardware production, and assures quality, availability, and marketability.
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| HD
DVD and DVD specification
| |
DVD |
HD
DVD |
| Disc
type |
| Disc
diameter |
| Disc
structure |
| Capacity
(Single-sided, single-layer) (Single-sided, dual-layer) |
| Playback
time*
Recording time* |
| Laser
Wavelength |
| Compression
technology |
| User
bit rate |
| Track
pitch |
|
DVD-ROM
(Read-Only) |
120mm |
0.6mm
x 2 substrates |
| 4.7GB
8.5GB |
4.7GB,
SD resolution:
132minutes
8.5GB, SD resolution:
238minutes |
650nm
(red laser) |
MPEG-2
|
11.08Mbps |
0.74µm |
|
HD
DVD-ROM
(Read-Only) |
HD
DVD-R
(Recordable) |
HD
DVD-Rewritable
(Recordable) |
120mm |
120mm |
120mm |
0.6mm
x 2 substrates |
0.6mm
x 2 substrates |
0.6mm
x 2 substrates |
| 15GB
30GB |
15GB |
20GB
32GB(Under development) |
15GB,
HD resolution:
over 4 hours
30GB, HD resolution:
over 8 hours |
15GB,
HD resolution:
over 4 hours |
20GB,
HD resolution:
over 5.5 hours
32GB, HD resolution:
over 8.5 hours |
405nm
(blue laser) |
405nm
(blue laser) |
405nm
(blue laser) |
MPEG-4
AVC/ VC-1/MPEG-2 |
MPEG-4
AVC/ VC-1/MPEG-2 |
MPEG-4
AVC/ VC-1/MPEG-2 |
36.55Mbps |
36.55Mbps |
36.55Mbps |
0.40µm |
0.40µm |
0.40µm |
|
*Playback
or recording time depends on data transfer speed. |
| Comparison
of HD DVD and DVD disc structures
|
Blue
laser diode for high-density recording
The blue laser that reads and writes to HD DVD has a shorter wavelength
than DVD's red laser. Even though DVD and HD DVD share the same disc structure,
the blue laser's shorter wavelength translates into an HD DVD storage
capacity dwarfing that of DVD. Single-sided, single-layer DVDs can hold
4.7GB of data. The single-sided dual-layer HD DVD-ROM surpasses that 6.2
times with its 30GB capacity. |
Data
processing with minimal noise
The latest advance in signal processing, partial response and maximum
likelihood (PRML), minimizes noise problems resulting from playing high-density
data. |
Sophisticated
video compression technology
In addition to DVD's MPEG-2, HD DVD players also recognize both MPEG-4
AVC and VC-1 based on Microsoft's Windows Media. The excellent efficiency
of MPEG-4 AVC and VC-1 allow image data to be compressed to about one-third
the size achieved by MPEG-2 and replay of high quality digital images. |
36Mbps
rate for high-definition images from digital TV broadcasting
With a transfer rate of 36.55Mbps, HD DVD disc drives outperform the 24Mbps
maximum transfer rate of digital TV broadcasts. As a result, high-definition
images can be recorded and played back, for many hours of viewing pleasure. |
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