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.