Recording CD's places a high demand on the hardware you use, and your computer's system resources. In particular, problems with data transfer may occasion the ubiquitous "buffer underrun" error so many have run across. This message is generated by the disc recorder when its buffer empties and no other data is coming down the pipe. Possible ways to cure the problem include:
And, of course, NEVER run another program during a recording session. Not even Windows or MacOs functions/utilities. Just don't touch nothin'.