My pen drive doesnot show up on my Mac. Is it corrupt? How can I solve this and get my data back? I have a question about moving my iTunes music. My entire collection is on my iPhone4. It was also on my PC, but this died. I now have a Mac, iPhone6 and have bought iTunes Match. How can I transfer my music from my iPhone4 to my iPhone6? Are there any tools? Should I buy an external hard drive?