I have a WD passport HD that powers off the usb port. However I need to supply a power source to it ti I can use it to record from my TV as the current drain (according to the TV manufacturer)is too heavy for the TV USB port.
Any help appreciated
Maybe you could use a powered USB hub? Plug the powered hub's power cable into an outlet, the hard drive into the hub, and the master cable into the TV? I'm not sure if the TV will recognize it, but it's all I can come up with besides getting a new hard drive. Maybe you could try using your hard drive with your TV and it might work anyway. Shouldn't hurt to try.
I'd think USB3 would have enough power, but if the TV's specs say otherwise, then probably not.
If you're going to use this drive for recording, I'm going to assume the drive is empty? If so, just plug it in and try. It's either going to work or it's not. Unlike some other things, power is very well controlled under USB. So if it spins up, and starts recording ok, then all is well.
If not, blazorthon's idea is the way to go.