Attaching USB Drive - Can't read AP configuration file, kills internet

Current network:
Airport Extreme (Sim Dual-Band)
Mac Pro (wired Ethernet)
MacBook Pro (wired or WiFi N)
MacBook (WiFi N)
2 x iPhones (WiFi G)
Airport Extreme in use for several months with no problems. All Macs can read/write it's configuration.
I hooked up a 1TB My Book USB HD to the Airport Extreme via USB. All three Macs (Mac Pro, MacBook Pro, MacBook) could see and read/write to the new drive. The Airport Extreme appeared in Airport Utility on all three Macs. Wired, WiFi N + G internet continued to work great... however none of the Macs could read the configuration file of the Airport Extreme. If I unplugged the USB drive all the Macs could read and write to the configuration file.
I plugged the USB drive back in and left it overnight. This morning, everything continued to work, with the exception that none of the computers could read the configuration of the AP.
Around 10am today the Macs/iPhones could no longer connect to the internet. I disconnected the USB drive and now the internet works again.

Hey David,
I know you said you read a lot of posts already and none of the other solutions worked, but just in case, if you haven't already I would run through the steps in here:
Apple Computers: Troubleshooting the slot-loading SuperDrive
http://support.apple.com/kb/HT2801
Welcome to Apple Support Communities!
Have a good one,
Delgadoh

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