They don't mention how hard it is to find an HD DVD drive for a PC. Also, why do disks at all? Why not rip and put them on a Mivx? Or can Apple TV play ripped

They don't mention how hard it is to find an HD DVD drive for a PC. Also, why do disks at all? Why not rip and put them on a Mivx? Or can Apple TV play ripped movies in HD? (Mivx can!)