In the BIOS settings, there should be four settings, one master and one slave for each controller. If your BIOS allows for an AUTO setting try that and it should auto-detect the drives. On most of the older BIOS there was an auto detect function you could invoke by pressing a key like F8 or similar and it would detect the drives and set the BIOS properly, newer BIOS can auto-detect at boot time. If you know which slave slot is for CD and if there is a CD setting in the BIOS, use that setting, and check to make sure the CD drive is jumpered as slave. If drives are not showing up then usually they are either not jumpered correctly or the BIOS setting is not correct. There are two other possible pains with old BIOS, one is limitation of drive size, some older BIOS may not support the full capacity. Some drives have a special jumper setting for this which will limit the drive size for older BIOS. And in some rare cases you need to manually set the capacity, number of cylinders and tracks, although its becoming rare that you'd have to do that anymore. The most important thing is making sure the drives are jumpered correctly as one master and one slave on each cable and making sure the drive is enabled in BIOS, if there is an auto setting in BIOS try that, if the drive is still not working, the drive will be labeled with info for cylinder/track/capacity and you can set them manually. Hopefully you will not need to do this. -- Doug