you can't go wrong in putting all your songs into an ext. hhd..i can't even tell you how many back-up ext. hhd's i got ( all 500g slim design hhds.) not including the one's i got pugged into my show & back-up laptop, i just ordered a new one ( Seagate GoFlex 500gb Usb 3.0 SuperSpeed drive ) i worked on one yesterday ( helped a friend copy her song into it ,she doesn't know how) as a back-up and it was fast so i decided to get one
..just make sure that you always plugged that drive to the same usb port. for it to have the same drive letter..good luck