[doug363]

I'm aware of at least one PS3 game port that had around 40GB of data at launch. I'd be surprised if that were the only one.

Most games' source data is much larger than the shipped data size for a number of reasons, mostly because files designed for human editing encode a lot of information not needed by the game itself, and game source data is aggressively compressed making it unsuitable for further editing. A full snapshot of the source data for a game like Battlefield 4 is likely to be on the order of hundreds of GB, maybe getting up to the TB range. And if multiple teams are working on the same source data, then the source data needs to be sent between them.

Also, before the final few months of development, games' runtime data will often significantly exceed the final shipped size because compression and quality tradeoffs have not been decided and applied.