I have a Sony Vaio that comes with a split hard drive (C drive and D drive). The C drive is now completely full so I want to transfer all my itunes onto the D drive to free up space. So far I have copied the whole iTunes library but the problem is that if I delete any music from the C drive iTunes can no longer find it. I can manually search for each track but this would take a ridiculously long time. Can anyone help me at all? Surely there must be a way to remap things out in iTunes (I've tried changing the file location but it didn't work).

Thanks