Lilttle tip for you: 2,5" hdd/ssd dont need 12V line to power.
So you can use only 5V line (two cables +5V and GND) from mobo molex.
In one project I used the same mobo but not hdd, just SSD and for power it up i used 5V from internal usb pins.
+ you should change this sata cable to blue and will be perfect