What power cords do I need?

[Needing help]

I have a corsair cx750m semi-modular power supply - I'm trying to add a second hard drive - a seagate 2t -
Im wanting to clone my old hard drive onto the new one - I bought a USB/SATA cable - I plugged it into 5 different USB ports - keep getting the message NO MEDIA - knowing I'll want it to be plugged in via the power pack - I don't see any extra cables that'll fit/work with my seagate hard drive.

What cables do I need to buy?

I'll thank you now for any an all help solving this issue