buffer underrun

     In computing, buffer underrun or buffer underflow is a common problem when burning data into a CD. It happens when a buffer used to communicate between two devices or processes is fed with data at a lower speed than the data is being read from it, resulting in a process being fed data at a lower speed than the data is being read from it. Recording data to a CD-R is a real-time process that must run nonstop without interruption of the signal. This requires the program or device reading from the buffer to pause its processing while the buffer refills.