Actually, the hard drive is the same size. The increased space is due to the fact that it takes the actual mpeg2 stream straight from directv, so it's a lot more efficient than the SA tivos, since it doesn't have to be reencoded. the increased quality is due to this as well, since DTV uses hugely sophisticated encoders to get the best mix of quality and size, the tivo doesn't have to use it's $5 encoding chip to do the work.
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Actually, the hard drive is the same size. The increased space is due to the fact that it takes the actual mpeg2 stream straight from directv, so it's a lot more efficient than the SA tivos, since it doesn't have to be reencoded. the increased quality is due to this as well, since DTV uses hugely sophisticated encoders to get the best mix of quality and size, the tivo doesn't have to use it's $5 encoding chip to do the work.