G4/G5 How to move 2nd hard drive to different bus ??


I purchased SoftRAID to create a mirror of my system drive on a G4 and G5 desktop machine. SoftRAID says that the 2nd drive that will mirror the first drive should be on a different bus for optimal performance.

When I look inside the G4 and G5 it's not apparent as to how I would do this.

Do I need to get another ribbon cable and plug into the motherboard ?

Any advice would be very appreciated, thanks!