<unit> (Or "Mb") megabytes or megabits. When referring to the size or
data transfer rate of a storage device which is accessed in multiples of eight
bits (e.g. RAM, hard disk) this almost certainly means megabytes, but when
referring to the data transfer rate of a communications system it probably means
megabits. Some years ago, it is claimed, "MB" always meant megabytes and "Mb"
meant megabits but recently this useful distinction has been lost.
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