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Gballzack said:

We also have to take into consideration that the majority of the space taken up on a Blu-Ray disc game is redundant information that wouldn't be needed on a DVD-9.

This isn't true for multi-disc games however.  When you have a multi-disc game, you will need to have some redundant data between discs because the core game files need to be read and re-read now and again.  If there is no redundant data, you would have to do a lot of swapping back to disc 1 and then back to whatever later disc again.