The rate at which data can be moved between devices. The
average rate is determined by the capability of the read or write device but the
instantaneous rate is determined by the capability of the interface or
transmission path. Buffer memories are used to achieve the change in rate. For
typical magnetic tape operating at 800 bytes per inch and 75 inches per second
the rate is about 60 kilobytes per second. Disk storage systems can have
transfer rates in excess of 3 megabytes per second. Fast serial interfaces
operate up to 50M bps.