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Wikipedia says:

MPEG4-MVC compresses both left and right eye views with a typical 50% overhead compared to equivalent 2D content, and can provide full 1080p resolution backward compatibility with current 2D Blu-ray Disc players.

So if a Blu-Ray 3D is completely backwards compatible to a regular Blu-Ray, why do all consumer Blu-Ray-3D packages contain a 2D as well as a 3D disc? Is that just marketing (so people will even buy it if they don’t yet have a 3D-capable setup) or is there some technical reason behind this?

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Disk allocation and production is part of A/V production, so I think this is safely on topic, particularly since there is a real production reason why this is. –  AJ Henderson Dec 3 '13 at 21:43

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Disk space. The 3d content takes more space so there is generally not enough room for special features. The 2d special features are only on the 2d disk. They take up the room that the second eye takes on the 3d disk. They could make a special features only disk, but this is generally more expensive since it requires another master and another production line. It's more cost effective and better marketing to just include the 2D copy.

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Why does making a special-features-only disc require a new master while a 2D disc does not? Doesn’t every version with different content require a new master? –  Raphael Schweikert Dec 4 '13 at 7:30
@RaphaelSchweikert - yes, but most often the 2D disc is the same as the non-3d retail version, so they would make that disk anyway. They don't just sell all 3d versions because it doesn't make sense to include the 3D disk when someone doesn't want it (extra cost) and because the convention is to charge extra for the 3d version. If they ever stop charging extra, we may see them just release the 3d version and not bother with a 2d, but currently that isn't the market direction. –  AJ Henderson Dec 4 '13 at 14:09

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