the formatted capacity is always different (and less) from the discs stated capacity, so heres a chart based on 1 gb = 1024mb
4.7gb DVD = unformatted: approx 4812mb formatted: 4392.96mb
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1 mb=1 minute of film. So 2 hours would be 120 Megabytes.
A single DVD is capable of holding 4813 megabytes of data. Blu Ray disks, on the other hand, can hold 25600mb.
Most DVD discs hold up to 4.7 GB. The movies that these discs are on usually are much lower than that, but it helps to have the spare room.
If you are talking 'memory' in computers than I think you want to say how many MB in a GB? 1,000 MB = 1 GB
1 Mb = 1024 Kb