<Tr> <Td> 1024 </Td> <Td> YiB </Td> <Td> yobibyte </Td> <Td_colspan="2">--</Td> </Tr> <Tr> <Td_colspan="5"> Orders of magnitude of data </Td> </Tr> <P> The megabyte is a multiple of the unit byte for digital information . Its recommended unit symbol is MB . The unit prefix mega is a multiplier of 1000000 (10) in the International System of Units (SI). Therefore, one megabyte is one million bytes of information . This definition has been incorporated into the International System of Quantities . </P> <P> However, in the computer and information technology fields, several other definitions are used that arose for historical reasons of convenience . A common usage has been to designate one megabyte as 1048576bytes (2 B), a measurement that conveniently expresses the binary multiples inherent in digital computer memory architectures . However, most standards bodies have deprecated this usage in favor of a set of binary prefixes, in which this quantity is designated by the unit mebibyte (MiB). Less common is a convention that used the megabyte to mean 1000 × 1024 (1024000) bytes . </P>

4 mb is equal to how many bytes