I have an external hd and disk utility wont format, but Partition Magic on the PC will. So if I have the Fat32 format, I can put any file from my pc on it, plus any file that I imported from my pc to my mac FROM MY MAC to the HD. If I try to copy my files from my mac, documents applications etc, it tells me that some characters cannot be displayed. Also if its a zip or something simple, it will tell me that contents cannot be read or written. I cant win! Any ideas? I really need something that can switch between the two comps. If I could only get the mac to copy to hd I WOULD BE IN BUSINESS. Thanks in advance...