"Culprit number one is marketing hype. OSs measure storage in multiples of 1024, so 1GB is equal to 1024MB. But when vendors sell hard disks, they use 1GB as equal to 1000MB, so when you look at a 200GB hard disk, which has a capacity of 200,047,001,600 bytes, it actually has only 186GB of available storage. "
It's all in the advertising.
As oldmn has stated, the drive will use some if its own space for formatting and partitioning information.
If you look at the specs of the drive real close, more than likely it will show 'unformatted capacity' and 'formatted capacity'.
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