The external hard drive is not self-powered I returned the item, not having the ability to plug into a free electrical outlet and close to my installation. I did not want to use an extension cord that would have increased the number of son to the ground and I bought a disc of another brand to connect only on a USB.Intenso Ports - 6011561 - External Hard Drive 3.5 " - 1 TB - USB 2.0 - Black