Get the facts straight
Before this gets out of hand:
1. Single layer Hd DVD= 15gb Dual Layer= 30GB Triple Layer=51GB (improved data density or somthing)
2. BluRay SL= 25GB DL= 50GB 4L= 100GB so 200GB requires at least 8Layers.
3. Both formats support 1080p and both use compressed video on all releases, infact they both use the same codec
4. BDA's Java system is supposed to be an absolute dog to code for, where as MS's HDi is a lot more convenient. As for Java being more open, leading to Linux support - that won't happen due to AACS (the same reason why there is no official playback of DVD on Linux)
5. HD DVD did have data discs available (verbatim and Imation etc) although the writers were no as mumerous and widely available as BluRay writers
6. As Daniel B said, HDDVD has been ademant from the very beginning that they have no intention of introducing region coding. Everything else is speculation.
7. Blu Ray outsold HD DVD in total disc sales 65% to 35% not 3:1. compared to having a potential player base of 90% to 10% so the attach rate of discs per player is greater for HD DVD.