come on mate...
/dev/hda - is only primary master
/dev/hdb - is only primary slave....
/dev/hdc - sec master
/dev/hdd - sec slave
and then the RAID CONTRLLER COMES :
So I think you are just fine...
And for the Raid its obvious to have something different...
I have the same mother... so if you have any problems please post them here..
I am going to install 2 raid myself soon and I have same mother and suse8.