Nero can write to multiple burners at the same time. Be aware that if the burners are IDE, it probably won't work very well, and even if the writes don't fail it won't save you much time due to the the limitations of the IDE bus. If they are SATA or Firewire drives and your computer is fast enough, you can probably take full advantage of Nero's ability to write to as many as four drives simultaneously (7 in the pro version).