Most ATA/66 and ATA/100 IDE cables will have a blue connector or a connector labeled "System Board". This will be plugged into either the IDE0 (Primary) or IDE1 (Secondary) connector on the motherboard. Typically the primary connector will be blue to signify that it should be used for a hard drive. The cables are typically keyed to only be inserted in one way but if the cable is not keyed, make sure that the red stripe on the IDE cable matches up to "Pin 1" on the motherboard.


