HD DVD data is stored as 1080p/24, but the player output (for now, at least) is 1080i/30 just like OTA. With any given codec the bandwidth is essentially the same for the same frame rate whether it's progressive or interlaced (although MPEG2 is somewhat more efficient at compressing progressive frames than interlaced frames).
BUT...I thought the initial HD DVD discs were encoded using VC-1, which is supposedly twice as efficient in terms of data storage as MPEG2 for the same bit rate. Capacity is then determined not simply by bit rate, but compression efficiency. It's really apples and oranges...
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