Plextor PX-716AL Installation And User Manual page 59

Section 5. Frequently Asked Questions
Q: Q: What effect does installing the DMA jumper have on operation?
A: The Ultra DMA setting (no jumper) should work in most cases. If your
computer hangs or crashes during data transfers from the PX-716AL drive,
add the DMA jumper to switch to multiword DMA mode.
With Ultra DMA mode 4, data transfers are at a maximum of 66.7 megabits
per second. When you add the jumper for multiword DMA, maximum data
transfer speed slows. For multiword DMA mode 2, maximum speed is 16.7
megabits per second. So with the multiword DMA jumper installed, your
drive may not write at maximum speed.
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PX-716AL Installation and Users Manual