Why does it need a power supply?

Does it need to have a power supply, or could I just plug it into the back of the iMac?

  • Asked by Thomas B
  • 28-Apr-2012
Belkin Ultra-slim 7-PORT USB 2.0 Hub

Belkin Ultra-slim 7-PORT USB 2.0 Hub

Product No Longer Available

1 Answer from the Community

  • Answer

    It's a powered USB hub, this allows it to supply power directly to the devices plugged into it, rather than relying on drawing power from the controller in the Mac, some hubs will work in both modes.

    In principle a single USB port should only power a single high power device (HDD, iPhone etc) so a hub that allows you to connect up to 7 high power devices usually comes with a stand alone PSU in order to supply 7 times the power the controller it is connected to can supply.

    • Answered by Geoff M
    • 05-Jun-2012