OK... Here is my current setup:
Airport Extreme Base Station has a USB hub attached to the USB port. On that USB hub is
(1) Brother DCP-7020 AIO Printer
(1) USB HDD Enclosure with a 200 GB HDD, formatted Mac OS Journaled
(1) USB HDD Enclosure with a 320 GB HDD, formatted NTFS

Ok, my problem is that it reports the NTFS USB Drive "needs Repair". But if I connect it to an XP or a Vista machine, it reads perfectly fine.

Is it because it's formatted NTFS? Do Extreme Base Stations not like NTFS?