Sharing external hard drive between PowerMac and Mac Pro

I have a western digital external hard drive connected to a PowerMac and one connected to a Mac Pro. The PowerMac can see the Mac Pro external, but not vise versa. Can someone tell me what could possibly be wrong? Both computers have the sharing setup and we have partitioned the hard drives.
Thanks

I'm assuming that you have Leopard on both Macs? When you say that you "see" the Mac Pro's external drive, are you seeing it in the sidebar? And if so is that showing up as the Mac Pro, or as the drive? It seems to me that if you're seeing the one, then what you've done is to "connect as" with the user login, but haven't yet done that with the MacPro to the PowerMac. Have you from the PowerMac clicked Add at the bottom of the User's list to add the right username, or clicked New Person to enter a name and password?

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