Very disappointed with the product. Initially, the device was not needed, but the order could not be canceled quickly enough because delivery took several weeks. Then he tried to get a refund but the seller expects the buyer to cost more than $100 postage to China. With that being said, I decided to open up/try out the device. Multiple dead/useless ports, or if they work are simply unusable due to extremely slow speeds. Not to mention the Mac keeps throwing up messages about disconnecting the external HD. Think twice or look elsewhere.