What is a Megabyte (MB) and what is a Gigabyte (GB)?

Hard drive manufacturers define a megabyte as 1,000,000 bytes (1x106) and a gigabyte as 1,000,000,000 bytes (1x109). Some utilities use a binary conversion to calculate capacity. This is why users might see 504 MB reported on one utility and 528 MB from another.

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