Problem with USB port on back

[maxmoto]

I am unable to get my hard drive to be recognized on the USB port on the back of my 622. I can plug in my HD to the front USB port and it works fine. Do I need a new reciever or am I not supposed to use the rear port?

 

[lakebum431]

The rear port should work fine. I am using the rear port with both of my 622s.