I have HP 7975 now with XP.I have the following drives installed: Philips CDD 4851 combo CD and CDRW HP 300i DVD comb drive I also have the following drive that is not installed: Pioneer DVD Rom that came on my computer about 2 years ago. I removed it when I installed the HP 300i. Question: Would I be better off to remove the 2 drives from my computer and replace them with the Pioneer DVD Rom and a NEC 2500A DVD comb which I also own. I have read that it would be better to have a DVD rom to read from and a DVD writer to write to instead of useing the combo reader/writer for both reading and writing. Also if I swap them out do I put the jumpers on the replacement drives in the same location as the ones I remove? My computer is working fine now so no problem with present drives. Thanks for all of your answers.