Maximum bit transfer rate

The “Maximum bit transfer rate (MBTR):

(Of solid state storage equipment}: "the number of data bits per second transferred between the equipment and its controller."

(Of a disk drive) "the internal data transfer rate calculated as follows:
 * “MBTR” (bits per second) = B x R x T, where:
 * B = Maximum number of data bits per track available to read or write in a single revolution;
 * R = Revolutions per second;
 * T = Number of tracks that can be used or written simultaneously."

Source
U.S. Export Administration Regulations, Part 772 (15 C.F.R. §772.1).