The CD writing process can't be interrupted in mid-session. To prevent this from happening, the makers of CD recorders put a write buffer in the drive, usually 1MB or 2MB. Data read from the hard drive, tape, or another CD is stored in the buffer, and pulled out as needed by the recorder.
If the recorder requests data from the write buffer, but there's none there, it's called a buffer underrun. The disc is still spinning, but there's no data to write, so the recording process aborts.
Some advices for preventing buffer underruns are:
- Use a faster computer
- Record at a slow speed
- It takes longer to empty the buffer
- Don't do anything else with the computer while recording.
- Don't record on a file server!
- Defragment your Hard Disk
- Depending on your setup, putting the recorder and your hard drive on separate SCSI controllers may be necessary
- Turn off the screen saver
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