What is the difference between Blu-ray Disc, DVD & CD?
Just as DVD meant a 5 to 10 times increase in storage capacity compared to CD, Blu-ray Disc will increase DVD capacity by 5 to 10 times. This is due, among other reasons, to the usage of a blue instead of a red laser and improved lens specifications, allowing for a much smaller focus laser beam which enables the recording of much smaller and higher density pits on the disc.
Below listed are major differences between a DVD & a Blu-Ray Disc :
|
Parameters |
Blu-ray |
DVD |
|---|---|---|
|
Storage capacity
|
25GB (single-layer) |
4.7GB (single-layer) |
|
50GB (dual-layer) |
8.5GB (dual-layer) |
|
|
Laser wavelength |
405nm (blue laser) |
650nm (red laser) |
|
Numerical aperture (NA) |
0.85 |
0.6 |
|
Disc diameter |
120mm |
120mm |
|
Disc thickness |
1.2mm |
1.2mm |
|
Protection layer |
0.1mm |
0.6mm |
|
Hard coating |
Yes |
No |
|
Track pitch |
0.32µm |
0.74µm |
|
Data transfer rate (data) |
36.0Mbps (1x) |
11.08Mbps (1x) |
|
Data transfer rate (video/audio) |
54.0Mbps (1.5x) |
10.08Mbps (<1x) |
|
Video resolution (max) |
1920×1080 (1080p) |
720×480/720×576 (480i/576i) |
|
Video bit rate (max) |
40.0Mbps |
9.8Mbps |
|
Video codecs |
MPEG-2 |
MPEG-2 |
|
MPEG-4 AVC |
- |
|
|
SMPTE VC-1 |
- |
|
|
Audio codecs |
Linear PCM |
Linear PCM |
|
Dolby Digital |
Dolby Digital |
|
|
Dolby Digital Plus |
DTS Digital Surround |
|
|
Dolby TrueHD |
- |
|
|
DTS Digital Surround |
- |
|
|
DTS-HD |
- |
|
|
Interactivity |
BD-J |
DVD-Video |
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