I recently installed a new hard drive into a MacBook Pro. I then transferred the data from a smaller Mac Mini hard drive to the new hard drive. My Time Machine backups and my iTunes library location are on an external drive (The same external drive). When syncing my iPhone to the Time Machine backups external drive, I often, but not always, receive the following error: "Attempting to copy to the disk "Time Machine backups" failed. You do not have enough access privileges for this operation." I'm running OS 10.7.4. How can I fix this? Thank you.