I have a imac 27 that I've had for maybe 4 months. I've ALREADY had to have the optical drive replaced once so far. I ONLY use the drive to import cds to itunes. I would like to get an external drive for this because my internal drive cannot handle it. Can anyone suggest a good external drive that is compatible for what I'm doing? I don't want to burn anything on it. Import only. Any suggestions would be greatly appreciated.