4 pin to SATA connector

[Wonderwill]

The mobo I got came with a connector with SATA power on one end and 4 pin on the other. My PSU, however, only has 1 SATA connector with a few 4 pins to spare. Could I effectively add more SATA HDs to my system using this connector? Here's a pic: Newegg

 

[Wonderwill]

Thanks