I have a external firewire hdd which is formatted as mac os extended, the device will not mount on my main mac (x.4 latest). Disk utility just goes spinning ball as soon as even thinks about mounting or erasing the ext. drive. My powerbook mounts the drive instantly. I have tried everything, switch on after powerup, disconnecting and reconnecting, using usb connector. I have a similar problem with my ipod not mounting until a restart. Everything works perfect on my powerbook using the identical os. PLEASE HELP.