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The new (December 1998) prefix for 1 048 576. Its symbol is Mi.

It was created to resolve the confusion between 10^6 and 2^20. The original prefix mega always means 1 000 000, and its symbol is M.

So 1 MB = one megabyte = 1 000 000 bytes.
And 1 MiB = one mebibyte = 1 048 576 bytes.

Likewise kilo is 1000, kibi is 1024. See prefixes for binary multiples for a fuller explanation.

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