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What is High Definition DVD (HD-DVD) and Blu-Ray Disc (BD)?
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BluRay and HD-DVD Sizes
Video HD-DVD and Blu-Ray Video Technical Info
More info


Blu-ray Disc (BD) is a next-generation optical disc format meant for storage of high-definition video and high-density data. The Blu-ray standard was jointly developed by a group of consumer electronics and PC companies called the Blu-ray Disc Association (BDA). As compared to the HD DVD format, its main competitor, Blu-ray has more information capacity per layer, 25 instead of 15 gigabytes, but may initially be more expensive to produce. Wikipedia

HD DVD (High Density Digital Versatile Disc or High Definition Digital Video Disc) is a digital optical media format which is being developed as one standard for high-definition DVD. HD DVD is similar to the competing Blu-ray Disc, which also uses the same CD-size (120 mm diameter) optical data storage media and 405 nm wavelength blue laser. HD DVD is promoted by Toshiba, NEC, Sanyo, and, most recently, Microsoft, HP [1], and Intel. Wikipedia


BluRay and HD-DVD Disc Sizes

BD-R Single layer 25GB or 7.8GB*
BD-R Dual layer 50 GB or 15.6GB
BD-RE Single layer REwriteable 25 GB or 7.8 GB
BD-RE Dual layer REwriteable 50 GB or 15.GB

HD-DVD-R Single layer 15 GB or 4.7GB*
HD-DVD-R Dual layer 30 GB or 9.4GB
HD-DVD-RW Single layer ReWriteable 15 GB or 4.7GB
HD-DVD-RW Dual layer ReWriteable 30 GB or 4.7GB
HD-DVD-RAM 20 GB

* = Small 8cm discs

Video Technical Info for HD-DVD and BD

BluRay
Video codecs MPEG2 - MP@HL and MP@ML
AVC/H264 - MPEG-4 AVC: HP@4.1/4.0 and MP@4.1/4.0/3.2/3.1/3.0
VC-1 - AP@L3 and AP@L2
Video frame size

High Definition Video
1920x1080x59.94i, 50i (16:9)
1920x1080x24p, 23.976p (16:9)
1440x1080x59.94i, 50i (16:9) AVC / VC-1 only
1440x1080x24p, 23.976p (16:9) AVC / VC-1 only
1280x720x59.94p, 50p (16:9)
1280x720x24p, 23.976p (16:9)
Standard Definition Video
720x480x59.94i (4:3/16:9)
720x576x50i (4:3/16:9)

Max video bitrate 40 MBps
Audio codecs Dolby Digital up to 5.1 channels (Max 640kbps)
Dolby Digital Plus up to 7.1 channels (Max 4.736Mbps)
Dolby Lossless up to 9 channels (Max 18.64Mbps)
DTS up to 5.1 channels (Max 1.524Mbps)
DTS HD up to 9 channels (Max 24.5Mbps)
Linear PCM up to 9 channels (Max 27.648Mbps)
Subtitles Image bitmap subtitles
Text subtitles - select different font styles, sizes and colors for the subtitles, or location on screen, depending on the disc's offerings. Subtitles can be animated, scrolled or faded in and out.
Other Features HDMV mode
Offers all features of DVD-Video and more. The authoring process is in line with DVD-Video creation.
BD-J mode
Offers unparalleled flexibility and features, because it is based on the Java runtime environment. It allows for extensive interactive applications, and offers Internet connectivity.
Maximum total bitrate 40 Mbits
Maximum data transfer rate 54 Mbits
More information http://www.blu-raydisc.com/


HD-DVD
Video codecs MPEG2
AVC/H264 - MPEG-4 AVC
VC-1
Video frame size

High Definition Video
1920x1080x59.94i, 50i (16:9)
1920x1080x24p, 23.976p (16:9)
1280x720x59.94p, 50p (16:9)
1280x720x24p, 23.976p (16:9)
Standard Definition Video
720x480x59.94i (4:3/16:9)
720x576x50i (4:3/16:9)

Max video bitrate 29.4 Mbits
Audio codecs Dolby Digital up to 5.1 channels
Dolby Digital Plus up to 7.1 channels
Dolby Lossless up to 9 channels
DTS up to 5.1 channels
DTS HD up to 9 channels
Linear PCM up to 9 channels
Mpeg Audio
Subtitles Image bitmap subtitles
Other Features iHD
iHD allows interactivity to be authored into a data format using XML and ECMAScript (standardized JavaScript) as its interpreted scripting engine. In contrast, the competing Blu-ray Disc high definition video discs will use either HDMV or BD-J for authoring interactive features.
Maximum total bitrate 30.24 Mbits
Maximum data transfer rate 36.55 Mbits
More information http://www.dvdforum.org/



More Info

Official BluRay Disc - http://www.blu-raydisc.com/

Official HD-DVD - http://www.dvdforum.org/hddvd-tech.htm