If I were you, I would just get a Pocket Drive, that is about 40 gigs or so, that way you an back up ur music and more, it may even use less power than a disc (I'm talking about laptop battery's, always about power) Anyway, getting an external (for a desktop) or a pocket drive (for a Laptop) should all do you wel and good. The reason you get a pocket drive for the laptop is becuase almsot all external hard drives, even tho cheaper, and bigger in space, require external power, and that is a lot of cords to carry around, trust me. Using a pocke drive is either a lot of flash memory, I forget the highest there is, or a hard drive (IE Pocket Hard Drive). The advantage of this is it's smaller and does not require external power, even tho the space is a lot smaller for more penny. You can get one for about 100.00 (I think 40 or sixty gigs) But compared to how much laptop memory is, that isn't too bad of a price for something you can carry around (Use ur ipod if you already have one). All this takes less time to put on an external and you don't have to wait for read times (USB is a lot faster .... rite?).