I have been using this AirPort Extreme for over two years now and it's been working fine. I finally decided to buy a self-powered USB hard drive so I can share it over the network. However, after I unpacked the hard drive, connected it to my Mac and reformatted it to HFS+ Journaled and GUID. I plugged the hard drive into my AirPort Extreme's USB port and waited. I looked in my AirPort Utility and saw nothing in the disk list. I spent hours searching online and discovered that I am not alone in this problem, although solutions are rare. I did try one solution where I hooked up the USB hard drive to a powered USB hub and the hub into AirPort Extreme. It actually worked once and after I rebooted everything, even though the hard drive still showed up in the disk list, no computers can connect to it. Although if I connect the hard drive directly to a Mac, it would still work perfectly. Having a USB hub is not a long term solution not that it's working anymore anyway. I would appreciate any suggestions you may have, thanks!