How many Macs can connect?

I'm using an external Western Digital 1TB hdd to back up my Macbooks via Time Machine. The HDD is connected to the Airport Extreme via USB. One of my Macbooks connects with little to no problems and is able to backup the data from the Macbook to the HDD via Time Machine.
However, my second Macbook always gets the message "The backup disk is not available". When I go to the Time Machine, I am able to connect to the HDD and select it as my backup. But whenever the second Macbook tries to connect via Time Machine, the error pops up.
How many Macs are able to connect to the HDD via Time Machine?

Welcome to the discussion area, bigSherm!
The simple answer may be that Apple does not support Time Machine backups to a drive attached to the USB port on the AirPort Extreme.
Some users are able to get this to work...for a time...but corruption issues are inevitable. You might want to refer to the Apple support document regarding the use of Time Machine.
http://docs.info.apple.com/article.html?path=Mac/10.6/en/15139.html

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