Yes change them. One drawback though, is that the HDD on the same cable will be slowed to the CD-R(Rom) Drive speed. But I run on Primary IDE 1xhdd & 1xDVD ROM, Secondary IDE 1xDVD-RW & 1X HDD. I notice no slow down but maybe i'm just used to it. If you want to copy CD to CD it is always advisable to have them on different IDE channels.