DVD-5 single sided/single layer 4.7 gigs 2 hrs video
DVD-10 double sided/single layer 9.4 gigs 4.5 hrs

there is DVD-9 and DVD-18 but it is too expensive to manufacture due to its special transparent layer

720 x 480p = 345600 pixels
1920 x 1080p = 2073600 pixel
1080 has definitely a lot more pixels
To do 1080 you definitely need some new HD DVD format ...whatever that is...supposedly slated by a governing group in end of 2004 maybe.....


http://www.dvdsite.org/

http://www.hddvd.org/hddvd/

http://www.quadloft.com/hometheater- new HT