What's best? Blu-ray or HD DVD?
Hmm... If you just look at some basic statistics then it becomes so obvioulsy!!! Don't you think so? If not, read the comparing table between the High-definiton Optical Media Formats (DVD included for comparison) below:
| Blu-ray Disc | HD DVD | DVD |
Laser wavelength | 405 nm (blue-violet laser) | 650 nm (red laser) |
Numerical aperture | 0.85 | 0.65 | 0.6 |
Storage capacity (Single Side) | single layer | 25 GB | 15 GB | 4.7 GB |
dual layer | 50 GB | 30 GB | 8.5 GB |
Playback time in (video only)[a] | SD with MPEG-2 at 5 Mbit/s | 22.2 / 11.1 hours | 13.3 / 6.6 hours | 3.8 / 1.9 hours |
HD with | AVC or VC-1 at 13 Mbit/s | 8.5 / 4.2 hours | 5.1 / 2.6 hours | N/A |
MPEG-2 at 20 Mbit/s | 5.6 / 2.8 hours | 3.3 / 1.7 hours | N/A |
Mandatory Video codecs | MPEG-4 AVC (H.264) / VC-1 / MPEG-2 | MPEG-1 / MPEG-2 |
Audio codecs | lossy | Dolby Digital | Mandatory @ 640 Kbit/s | Mandatory @ 504 Kbit/s | Mandatory @ 448 Kbit/s |
DTS | Mandatory @ 1.5 Mbit/s | Mandatory @ 1.5 Mbit/s | Optional @ 1.5 Mbit/s |
Dolby Digital Plus[d] | Optional @ 1.7 Mbit/s | Mandatory @ 3.0 Mbit/s | N/A |
DTS-HD High Resolution | Optional @ 6.0 Mbit/s | Optional @ 3.0 Mbit/s | N/A |
lossless | Linear PCM | Mandatory | Mandatory | Mandatory |
Dolby TrueHD | Optional | Mandatory | N/A |
DTS-HD Master Audio | Optional | Optional | N/A |
Maximum bitrate | Raw data transfer | 53.95 Mbit/s | 36.55 Mbit/s | 11.08 Mbit/s |
Audio+Video | 48.0 Mbit/s | 30.24 Mbit/s | 10.08 Mbit/s |
Video | 40.0 Mbit/s | 29.4 Mbit/s | 9.8 Mbit/s |
Secondary video decoder (PiP) | Optional (Profile 1.1)[c] | Mandatory | N/A |
Secondary audio decoder | Optional (Profile 1.1)[c] | Mandatory | N/A |
Interactivity | BDMV and Blu-ray Disc Java | Standard Content and Advanced Content | Rudimentary |
Internet support | Optional (BD-Live only) | Mandatory | N/A |
Video resolution (maximum) | 1920×1080 | 1920×1080 | 720×480 (NTSC), 720x576 (PAL) |
Frame rates | 24/25p, 50/60i | 24/25/30p, 50/60i | 50/60i[e][dubious – discuss] |
Content protection system | AACS-128bit / BD+ / ROM-Mark | AACS-128bit | CSS 40-bit |
Region code | 3 Regions | Region free | 6 Regions |
Hardcoating of disc | Mandatory | Optional | Optional |
^ a Playback times are quoted for single sided discs of each size starting with the largest at the stated average bitrate, higher or lower average bitrates would change the available playback time. The numbers represent video only and the choice of audio codec and extra content also affects playback time.
^ b All HD DVD players are required to decode the two primary channels (left and right) of any Dolby TrueHD track,[115][116] however every HD DVD player released thus far decodes 5.1 channels of TrueHD.
^ c Secondary video decoder will become mandatory for new Blu-ray Disc players with Profile 1.1 on October 31, 2007.
^ d There are some differences in the implementation of Dolby Digital Plus (DD+) on the two formats. On Blu-ray Disc, DD+ can only be used to extend a primary Dolby Digital (DD) 5.1 audiotrack. In this method 640 Kbit/s is allocated to the primary DD 5.1 audiotrack (which is independently playable on players that do not support DD+), and up to 1 Mbit/s is allocated for the DD+ extension. The DD+ extension is used to replace the rear channels of the DD track with higher fidelity versions, along with adding additional channels for 6.1/7.1 audiotracks. On HD DVD, DD+ is used to encode all channels (up to 7.1), and no legacy DD track is required since all HD DVD players are required to decode DD+.
^ e On DVD 24 frame per second content is stored as 60 interlaced fields per second using a process called 3:2 pulldown, which if done properly can be reversed to retrieve the original 24 frame per second content.