It may happen that when you are burning a CD or DVD, that you are prompted by the buffer underun error message.
This is due to the fact that your CD/DVD burner will continuously write data during the burn process, thus data must be transferred without intermission. CD/DVD burners possess a buffer memory allowing them to store temporarily data, reducing the risks of having any intervals during the burn process.
But if data is not transferred rapidly enough to the buffer memory this can results to buffer underrun errors.(this ma y due to a lack of system memory, bottlenecks at CPU level or problems related to your hard disk.
This document entitled « Buffer underrun » from CCM (ccm.net) is made available under the Creative Commons license. You can copy, modify copies of this page, under the conditions stipulated by the license, as this note appears clearly.