How do Hollywood production studios fit more than than standard 4.7 GB of data on a DVD.?

They use Dual-Layer DVDs. Almost every single DVD nowadays is Dual-layer in order to fit all of the info on there. You can't tell by looking at the disc or watching the movie, but it might say it somewhere on the box (I doubt it though). Sometimes, if it's an old reissue (I know Criterion does this) they'll explain how the film was restored and they might mention it was pressed onto a dual-layer DVD.

If you find an .iso online it will often be compressed to fit onto a 4.7 gb disc.

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