aren't there two formats that a hdd can be in, fat 32 and ntfs, one doesn't allow files that are over 4gb's i believe so that might be why you can't transfer the file to your computer.
i dunno, i'm probably way off on that one, but i do know that if i download a rar'd dvd image file i can't unrar it cuz its over 4gb's and my hdd isn't formatted to accomodate that.