Connect external hard drive says needs repair

I have a brand new Seagate 320gb hard drive and when I plug it into my Airport Extreme it says it needs to be repaired by plugging it into the computer, but I don't know how to repair it or why it is saying this.

Launch disk utility and try to repair the disk, http://support.apple.com/kb/HT1782?viewlocale=en_US&locale=en_US

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