SATA Power connector identification

[Pk100 0]

I have a SATA 2 disk drive which I need to connect to the motherboard in an Inspire BlueV2 4 camera DVR, and can't identify which SATA power cable I need. The motherboard connector has 4 pins 1.5cm wide, and has a plastic bend-back catch on the front. It is smaller than the IDE MOLEX style with two corners shaved off. There is also a smaller connector on there called RS232?