two itunes libraries - one on external hard disk
Solution 1:
iPhone can be synced to only one iTunes library at any given moment. If you want to add songs to the iPhone, you must add them to your MBP's iTunes library and then sync to the iPhone.
iPhone can be synced to only one iTunes library at any given moment. If you want to add songs to the iPhone, you must add them to your MBP's iTunes library and then sync to the iPhone.