@datumir
It depends on the mixed-up definition and usage of MB (binary prefix or decimal prefix). To avoid confusion one may use MB for decimal prefix and MiB for binary prefix usage.
400.00 MB = 400 000 000 bytes = 400 000 000 / 1024 / 1024 MiB ~= 381.47 MiB.
On the other hand 400 MiB would be 400 * 2^20 bytes = 419 430 400 bytes.
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