After I did I-Tune update, I noticed that my I-pod wasn't recognized.
I tried to sync, and I don't know how I did.
But after I've done, I noticed that I was missing some of the music that I purchased through I-Tune, and they don's exist any more.
Also, I didn't back up those music on CD.
What can I do to restore those music? Do I have to purchase again?