Power supply for Maxtoe Basics External Hard Drive 500GB

Is 12VDC 2,0A the inner pin is + and the outer pin is -

Cocomick, the power supply converts your AC to DC.

Polarity matters very much on the pin to the device, after the conversion. It does not between the wall outlet and the power supply.

Ac adapter for the maxter 3200 is 12v AC 2amps polarity dos not mater as in dc. this is because the current is alternating between betwen + and - at 50htz henze when doing worke on mains like diskonecting kookers ets thay tell you to turn the main fuse swich off although cookers shower units do have a duble pole swich.