I have no dog in this fight, since I use neither itunes nor idevices, but ... You could 'chflag -R schg' the entire music dir, thus making it immutable - even

I have no dog in this fight, since I use neither itunes nor idevices, but ... You could 'chflag -R schg' the entire music dir, thus making it immutable - even for root - without chflagging it back. Then there's no more syncing risk. Just saying.