Not to answer your question exactly but.....
when I fitted an NEC ND1300A DVD/RW I had constant problems until I removed the HP CD/RW that was also fitted - seems there was a conflict between them.
As the DVD writer will also write CD's why bother to have both fitted anyway? Chances are that the CD writer will be a little older and therefore likely to write slower than the DVD drive.
As for the jumpers, I'm sorry but I can't remember....thought they were the same as a HDD jumper