What do you mean by IDE3? Is this a hardware RAID controller, and if so, is it supported by SuSE? (
http://cdb.suse.de/index.php?LANG=en_UK)
If it's an IDE channel, can your BIOS see the drives when you first boot up? Check that one device is set to master and the other to slave (you may need this for hardware RAID as well in some cases; see your RAID documentation).
Personally, I have two hard disks on seperate IDE channels and use software RAID set up through the SuSE installation.
Hope that helps,
— Robert J. Lee