My replaced unit usually records fine, sometimes it requires a reboot of my system to change the description of media from 'bad media' to 'recordable media' (any ideas?). The main worry is when a cd is first inserted, the unit makes such a noise and a tremendous amount of vibration, I am sure this does not do it or my system any favours. The writer is a 16-10-40 model and is tightly secured with 6 fixings. Can anyone out there help?