From my understanding, it should be as simple as connecting the drive to the USB port on the Airport Extreme. When I do this, no drive shows up under disks in Airport Utility. I have 3 partitions set up on the drive. One is formatted to read and write for Mac and Windows and the other two are formatted for Mac (Mac OS X Extened I believe). Are the partitions, formatting, or both causing the drive to not appear? Or should this not matter?