1 GB is precisely 1,073,741,824 bytes.
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1024 bytes = 1 KB 1024 KB = 1 MB 1024 MB = 1 GB etc.
No Mega means million, Giga is one thousand times bigger. (miljard or billion depending on which side of the Atlantic you are on)
"easy, 3000MB in 3GB" One would assume that is 3000MB but it is common place to assume that. But that is not entirely correct. Indeed it is true that in some cases 3GB could equal 3000MB (when talking about storage mostly). But in some (or most) cases 1GB is roughly equaled to 1,073,741,824 bytes which would be roughly 1024MB. So 3GB would be about 3,221,225,472 bytes or 3072MB.
1 Gigabyte is equal to 1024 Megabytes that is usually rounded off to 1000 Megabytes. As such, 2.0 GB is equal to 2000 MB.
Depends if you dealing with Music or Video, and it depends on the quality. In theory you could have 1 minute of video equal to 4.7GB, 10 hours, or more.