my ibook g4 will not read it. The hard drive turns on when i connect it, but wont appear on the desktop or anywhere on the it. However when I connect it to the PC, it works. Its a 40 GB Smartdisk Hard Drive and i have Leopard 10.5 installed. Would it have to do with the software that i have? It worked when i had 10.3.9. What can I do?