In most cases, these messages are being posted due to hardware problems with either the controller or, more likely, a device that is attached to the controller in question. The hardware problems can be associated with poor cabling, incorrect termination or transfer rate settings, lazy or slow device responses to relinquish the SCSI bus or a faulty device. See EventID 9 from source adpu160m for more details on this event.
From a support forum: This started when the virtual drive was automatically installed with Intervideo Copy DVD 4 which I have. I uninstalled the Intervideo Virtual Driver from the Device Manager and the problem was gone.