megabytes per second

from The Free On-line Dictionary of Computing (8 July 2008)

megabytes per second
MBps

   <unit> (MBps, MB/s) Millions of {bytes} per second.  A unit of
   {data rate}.  1 MB/s = 1,000,000 bytes per second (not
   1,048,576).

   (2007-02-20)