Apply the thermal compound across the full surface of the application area on the heatsink. Tightly push the drive against the metal surface (enclosure panel). Clean off the unwanted thermal compound from around the drive perimeter. Figure 1. Install the Drive Metal surface (enclosure panel) Heatsink Plate Screws Finless-type drive Drive mounting area Figure 2. Thermal compound application area Application area (B001 to B012, 2001 to 2021, 4001 to 4012) Application area (2030 to 2070, 4018 to 4038) Note: You can mill the metal surface to be more flat and use less thermal compound. Recommended flatness is 0.05 mm (0.00197 in) or less. After you mill the metal surface, tightly push the drive against it.