Fan Control Technology for Quiet Operation DMR-EX769 feature an advanced control system that automatically adjusts fan speed based on information received from an internal heat sensor. When the internal temperature rises, the fan turns on to prevent overheating. When the temperature is low, the fans shuts off entirely, providing whisper-quiet operation. Floating Structure Locating the damper closer to the hard disk drive than in conventional hard disk drive mounting effectively improves absorption of hard disk drive vibrations. DVD Drive Control The DVD drive operates only when a disc is inserted, eliminating unnecessary noise.