Plextor PX-850A Installation And User Manual page 30

Section 2. Installing the PX-850A Internal PATA Drive
NOTE: The configuration shown in Figure 8 can make it very difficult to
write from the DVD or CD drive to the PX-850A at maximum rated speed
using "on-the-fly" copying.
System configuration and performance will make a big difference.
Depending on how fast the DVD or CD-ROM drive can stream data to
the PX-850A, it may not be fast enough to keep the buffer full. In this
case, the buffer may become empty and a buffer underrun error may
occur. However, because it is equipped with Buffer Underrun Proof
Technology, your PX-850A can still make successful copies if you use
software that supports this feature. (All software shipped with PX-850A
drive retail kits supports Buffer Underrun Proof Technology.)
If you still have problems writing with this configuration, use the image
writing method (that is, write an image to your hard drive, then write that
image onto the DVD±R/RW or CD-R/RW media), or record at a lower
speed. We also recommend that DMA be enabled on your computer, if
your system supports it.
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PX-850 Installation and Users Manual