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M is a prefix that means "mega" which means million. There are a million bytes in a megabyte. A computer counts with 1024 b / kb, and the same for mb / gb and so on.

1 Mb in a computer is equal to 1048576 bytes

In any system there will be overhead (block sizes, header tables, etc.) so the approximation of 1 million for 1024×1024 might hold but it might be too high too!

You will not be able to put a file that is exactly 1048576 bytes on a memory stick that is advertised as capable of holding 1 Mb.

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14y ago

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