the USB 1.0 ports on the computer but USB 2.0 ports on the external drive.
Any chance you can exchange that drive for a Firewire drive?
When I try to format the Western Digital Hard Drive My Book, I get an "imput/output error." I started with a My Passport for MAC, which gave me the same message. WD tech support thought it might be that I needed an extrenal power source, so I got the My Book...but I get the same error message. This is after following all the steps in Disk Utility, trying to partition...
I have a Power PC iMAC G4 and am running 10.4.11