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Megabyte - The megabyte is a multiple of the unit byte for digital information storage or transmission with two different values depending on context: 1048576 bytes (10242) generally for computer memory; and one million bytes (106, see prefix mega-) generally for computer storage. The IEEE Standards Board has decided that "Mega will mean 1 000 000", with exceptions allowed for the base-two meaning. In rare cases, it is used to mean 1000×1024 (1024000) bytes. It is commonly abbreviated as Mbyte or MB (compare Mb, for the megabit).