Mac losses connection to the airport hard disk while the pc not !!!

I have an airport extreme (802.11n), Macbook 13" and Powerbook G4 15". And two windows PCs. Every day the mac computers losses the connection to the hard disk that is connected to the airport, and asking for the password, but it fail. While the PCs at the same time having no problems at all. Everyday I have to reboot the airport to use the hard disk. This is strange the Apple product is more compatible with Microsoft windows that OS X !!!!
Note: I have the first airport extreme (802.11n), not the gigabyte.
Message was edited by: Aljairan

I am also having this problem. If the PC is not connected, there are no problems sharing files off the drive, but as soon as I connect using Windows, the Macs drop their connection.
The HDD is a 1TB Western Digital My Book. It is connected to the AirPort Extreme via USB.
Thanks!

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Background
My setup is based on an AirPort Extreme access point WiFi network. The AirPort shares a hard drive, and a number of Windows clients connect to the network. One of these, a Windows 7 machine, has a USB mobile broadband dongle which I also wanted to share with the network.
Previously I got this to work, but whatever configuration I came up with required manual reconfiguration of each network client, one way or the other. This was not ideal. Also, Internet Connection Sharing (ICS) defaults to IP address .1, the same one to which the AirPort defaults. This needed manual reconfiguration of the ICS host each time ICS was turned on.
Solution
THIS SOLUTION REQUIRES THE AIRPORT TO BE IN EITHER DHCP + NAT OR DHCP MODE. IF FOR SOME REASON YOU DEPEND ON THE AIRPORT BEING IN BRIDGE MODE, UNFORTUNATELY THIS SOLUTION WILL NOT WORK FOR YOU.
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If you want to remove this unidentified network/router entry, execute the following from the command line with Administrator privileges:
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On your Windows ICS host, removing this entry can cause no harm.
However, on network clients where you removed this entry and subsequently want to share your Internet connection from again, you'll need to add it back.
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