Also wondering if anyone has copying problems to their external hard drives through the AEBS. I cannot get anything to copy, it gives me a couple of different errors. Anyone have some trouble shooting or fixes they can share?
You didn't tell us if you have the drive formatted as Mac OS Extended (Journaled), which is the best format for Mac. A FAT 32 format scheme can work as well if file sizes are not too large. A drive pre-formatted for Windows in NFTS won't work correctly at the USB port of the AirPort Extreme.
If your drives are in a compatible format, have you checked the drives for errors using Disk Utility on your Mac?