DMA jumper: Use the DMA jumper to convert between Ultra
DMA Mode 0-2 (no jumper, default) and Multiword DMA Mode 0-2
(with jumper installed). In general, leave this jumper at its factory
setting, which is Ultra DMA (that is, no jumper installed).


簡言之
DMA Jumper :
No jumper: Ultra DMA Mode 0-2 (default)
Jumper installed: DMA Mode 0-2


這種問題去下載Installation & User Manuals就會答案了...
http://www.plextor.com/english/supp...ls/manuals.html

以後遇到問題還是先去想辦法找Manuals，下載回來查比較快。