The iFelix unofficial 802.11n Airport Extreme Hard Drive Compatibility List
802.11n Airport Extreme Base Station
Airport is the name for Apple's wireless hardware. Airport is 802.11b which was replaced by Airport Extreme which is 802.11g. Apple have just released a new 802.11n Airport Extreme Base Station
This list refers to the new base station, if you are looking for printers which are compatible with the old base station please check this page.
Unlike previous base stations the new Airport Extreme Base Station can have a USB 2 Hard Drive connected to the USB port.
This is an unofficial list of USB Hard Drives which are are compatible with the new 802.11n AirPort Extreme Base Station.
Drives in dark red are in fact the only drives I have personally tested.
Please also note that due to changes in firmware and software upgrades some drives which are in this list may no longer in fact be compatible.
IcyBox 2.5" USB - SATA Enclosure
LaCie Mobile Hard Drive, Design by F.A. Porsche, USB drive, 250GB
Macally PHR-100AC 3.5" HDD Enclosure
Maxtor 500GB One Touch III
Maxtor 750GB OneTouch III
OWC Mercury Elite Al Quad Pro 500GB
SeaGate 500 GB External Hard Drive
Western Digital 120GB External Hard Drive WDXC2500JBRNN
Western Digital 120GB External Hard Drive WDXC1200JBRNN
Western Digital 120GB External Hard Drive WDXC2500JBRNE
Western Digital 120GB External Hard Drive WDXC1200JBRNE
Western Digital 500GB External Hard Drive
Airport Extreme and Express Hard Drives Incompatibility List
These printers are deemed to not work out of the box (or if at all) with an Airport Extreme in the same way as the drives listed above. Where the driver is linked then there is page with further information which may be of use.
Acomdata 250GB USB 2.0/Firewire
If your hard drive is not listed in either list then it has not been tested by anyone to see if it will work or will not work, this does not mean it isn't compatible just means we don't know. If you can please test it and add a comment to the comments link.