New hard drive problems - Mac OSX Server

I am trying to install a new hard drive in our company's xserve which runs mac osx server. I have a brand new 320 gig hard drive, which I put into the "special" hard drive tray, then installed into the front of the server. I expected the mac to do something... anything... but nothing happened. How do I get the new hard drive to work?

Thanks!

 

Details

I installed the drive on a windows box, and the drive works perfectly, but the mac server won't mount it, nor does it appear in the disk utility. How do I get this drive to show up?