The HD-DVD drive should do 1080i over component unless the disc uses the ICT, which no disc will for quite a few years probably. For information on what format it is on the disc, check out here: http://www.highdefdigest.com/. Most likely, if it's on HD-DVD, it's in 1080p using the VC-1 codec. The HD-DVD drive should either interlace that for 1080i or scale it for 720p, depending on your output preferences.