Why does a DVD you buy have more storage than 4.7GB ?

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When you buy a DVD it has 4.7GB

But if you buy a game like Black Ops it has about 8 GB on the DVD.

How ?
 
A standard DVD has a single layer 4.7 GB disc, commercial DVD has more than one layer.

"In DVD recording, a standard, single layer, 4.7 GB disc holds up to 2 hours of video at DVD quality. All commercial movie DVDs hold about 5GB per layer - which each layer holding about 133 min. If you buy a movie DVD that has a 2 hour movie, plus an hour or so of extra features, this means that the disc has more than one layer. Some DVDs are also dual-sided.
All currently available DVD players and recorders can play back commercial discs with more than one layer. However, some older players (pre-1999) may not be able to in all cases. "
 
Just speaking in general about DVD's here.
Double layer DVDs can hold about 8.7GB of data.
A single layer has 4.7GB.

You can usually buy either at shops.
Some games discs use dual layer for its bigger capacity.

Also, in some cases, files are compressed to a large extent on discs.
 
single layer dvd's are 4.7gb, and dual layers are 8.5gb, you can buy dual layers from any computer store
 
Because a DVD-R and a commercial DVD are not the same thing. A commercial disc is dual layer. A DVD-R is not unless you specifically buy a dual layer DVD-R (or DVD+R).
 
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