IMac doesn't recognize external HD connected to Airport Extreme

Just bought a new Airport Extreme and an Iomega Prestige HD for file sharing and backup through Time Machine.  When I open Disk Utilities, the external HD is not listed.  I did connect the HD directly to the Mac and it showed up.  I reformatted the disk and then reconnected it to the Airport Extreme...still nothing.  Any help would be appreciated.
Brian

When I open Disk Utilities, the external HD is not listed.
You won't see it in Disk Utility unless the drive is connected directly to your Mac
I reformatted the disk and then reconnected it to the Airport Extreme...still nothing.
The USB port on the Extreme is under powered. You almost always have to use a powered USB hub, even if your drive has its own power supply
backup through Time Machine
Careful...Time Machine backups to a drive at the USB port are not supported by Apple. A few users report that they apparently have been able to make this work, but most us encounter corruption issues either immediately, days, weeks, or sometimes a month or two down down the road.
Bottom line....it's "iffy" and there's no support if you have problems, which are very likely.
From Apple: Time Machine can’t back up to an external disk connected to an AirPort Extreme....
http://docs.info.apple.com/article.html?path=Mac/10.6/en/15139.html

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