I seem to remember reading somewhere that you can have problems if CD/DVD drives share the same cable as a hard drive. CD drives use a slower transfer rate than hard disks, so your HD will be running slowly. My advice would be to attach both HDs to your IDE0 socket, with your biggest & fastest set to master and the other one to slave. Do the same with the CD/DVD drive on the second channel - IDE1. Who knows? It might help your problem? If you have recent HD, they probably are UDMA 100 (Ultra DMA Mode 5), whereas your CD drive will be at an older and slower standard.