1楼

比较简洁，看上去满不错

2楼

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Why I want to post this guide on this of http://www.meirener.com.cn is to help people solve the same problem.
Please let me know if it is inapproprate here.
Here is the guide, hope it would do people a favor.

The Difference Between Blu-ray and DVD
With the popularity of Blu-ray, many people still can’t tell Blu-ray from DVD.
If you do not know the difference between Blu-ray and DVD exactly, you can find your answer from the table below.
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 0.60
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
Blu-Ray uses a blue-violet laser as opposed to the red laser used on DVDs. This allows Blu-Ray discs to hold a lot more information on them than DVDs.
This increase in the amount of information that can be stored on a disc allows you to put High-Definition movies on a disc and not run out of space, since the average HD movie will take up about 15-20 GB of space.
If you have not seen an HD movie yet I would suggest stopping by your local Best Buy or Circuit City and looking at a Blu-Ray display. The images are sharper, brighter, and more detailed than any DVD movie. What manufacturers are trying to do is make the movie look as close to what you see in a real theater as possible, except for its a tenth the size and in your home.
Blu-Rays cannot be played in a traditional DVD player, which means that you will eventually have to buy a blu-ray player. However, all blu-ray players can play DVDs, and they upscale the images to look better on an HD screen, up to 1080p.
So, while you will have to get a new Blu-Ray player to play HD movies, you can still see all of your current DVDs on the same player, and they’ll be enhanced.
In essence, Blu-Ray will replace DVD just as DVD replaced VHS and the CD replaced the Casette Tape.