If you read any of the NUMEROUS FAQs sitting at the top of these 360 boards you would know what Hi-Def means.
HD is just a resolution
"Standard Definition" is 640x480 interlaced or 720x480 interlaced
"Enhanced Definition" is 640x480 progressive or 720x480 progressive
"High Definition" is 1280x720 progressive or 1920x1080 interlaced or 1920x1080 progressive
it has nothing to do with the medium the content is placed on WHAT-SO-EVER
In fact I have a DVD (just a regular old DVD) with Terminator 2 encoded in 1920x1080 progressive
You could put HD video on a floppy disc if you wanted to, you could probably only put about 2 seconds of video on there, but you could still put it on there.
Blue-Ray and HD-DVD (BTW "High Density Digital Versatile Disc") are no different then regular DVDs except they have more space, THATS IT. There's nothing special about them that makes them more or less able to display certain types of content.
Higher resolutions requires more space so they're putting it on discs that have more space.
Do some research before asking questions that will get you flamed
http://forums.xbox-s...howtopic=408961