I have a lot of music on my macbook and want to download more. I just bought a 520 GB hard drive. How would you recommend storing this music so that it would be easily accessible from the external and backed up yet cleared from my computer? there has to be an easier way than what I had with my pc......(everytime I wanted to hear a song from my external or put one on a cd I had to go through all these folders - transfer the song from the external to the computer and wait)