WD Elements 3tb hard drive Power Plug

I recently purchased a WD Elements 3tb hard drive with usb 2.0. I find it very annoying that I have to plug it into a powerpoint in order for it work, so I was wondering is there a something I can buy that will give an output of 12v but has a usb connecter on it so I can plug it into my computer instead of a powerpoint? 


You need a USB powered drive for that the one you bought is externally powered.


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Thanks so there is no way to power it without a power supply?