Yamaha CRW8424SX Series Owner's Manual page 34

Errors occur when backing up at 6X or 8X speed from a separate
CD-ROM drive to the CRW8424SX drive.
A possible reason is that the CD-ROM drive is not suitable. Please use a high-
speed CD-ROM drive. However, for various possible reasons, you may still
encounter errors even if you are using a 32X or 42X speed CD-ROM drive.
Therefore, before writing directly at 6X or faster speed, you should check that it
is possible to do so by choosing to test before writing.
The "Buffer Underrun" error message is displayed.
Try the following:
• Lower the writing speed setting.
• Create an image file of the CD on the computer' s hard disk.
•
Defragment the hard disk.
•
Turn hard disk power management off.
• Deactivate the Active Desktop (if you are using Internet Explorer 4 or 5).
• Disable network access.
• Close other applications (including screen savers, task schedulers, etc.).
n Errors can occur if you knock the CRW8424SX drive while it is writing to disc.
n When using packet writing on a CD-RW disc, the actual data capacity is 100MB less than that
stated on the cover of the disc. The difference in capacity is dependent on the writing mode.
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Troubleshooting