I just purchased a WD My Book 1.5TB network drive I have plugged into an ethernet port on my Airport Extreme. Would I have been better off regarding drive speed/performance to have bought a USB 2.0 drive and plugged it into the USB port on the AE? Also, the drive shows up in the finder immediately on both Leopard and Snow Leopard Macbooks. However, I am unable to mount drive and change anything, i.e. name, add authorized users, etc. I also can't find IP address of drive to potentially mount through IP interface? Any thoughts?