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thekitchensink said:
See, this is one of the reasons that I get in the car and hop over to Blockbuster when I want to rent a movie.

But about the question of why BR/HDDVD are necessary, I believe that a 2-hour SD only takes about 1-2 gb. On a DVD, this means they have 7 gb left for extra content. For an HD movie using 4-5 gb, there isn't much room for extra content on a DVD, necessitating more storage.

 Spiderman 3 in 1080p with five 5.1 lossless audio tracks takes up 43 GB.