I have a 2012 128 GB SSD Air with 67.5 GB left. I just installed Left 4 Dead 2 for Steam and it took nearly 15 GB of space I have gone through a few tips to save space such as removing apps I don't need/use, languages I don't need, and made it so the mail client doesn't store stuff locally. Is there anything else I can do? The only thing I think I can move off my SSD would be my music which is about 15 GB. I don't store movies or any other media on my SSD and documents+apps don't take up that much space. Would playing music from an SD card or USB 3.0 through iTunes result in any sluggishness? That may be my only option eventually.