Quote:
The Mebibit is a multiple of the bit, a unit of information, prefixed by the standards-based multiplier Mebi (symbol Mi), a binary prefix meaning 2^20. The unit symbol of the Mebibit is Mibit.
1 Mebibit = 2^20 bits = 1048576bits = 1024 kibibits
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https://en.wikipedia.org/wiki/Mebibit
No-one seems to use the 'i' though, a 4 Meg ram chip is generally 4MiB 4 * 1024 *1024 * 8 bits, but comms and hard disk companies use the strictly correct k=1000 because it gives bigger numbers.