Use this formula to calculate the maximum thermal resistance RθEHS_max of the external heatsink.

Select an external heatsink with a smaller thermal resistance than RθEHS_max.

Make sure that the dimensions of the external heatsink are close to the drive dimensions (H × W). If the thermal resistance of the external heatsink is large, but the dimensions of the external heatsink are near the external dimensions of the drive, select one of these external heatsinks:

  • External heatsink with more fins

  • External heatsink with longer fin shape

Consider the installation environment of the drive and correct the thermal resistance RθEHS of the external heatsink. Dust and unwanted material can decrease the cooling capacity of the external heatsink.

Note:

Apply correction factors to the thermal resistance values listed in the specification of the external heatsink in these cases. For details, contact the external heatsink manufacturer.

  • The heatsink height and width dimensions are much larger than the drive heatsink plate dimensions.

  • You are installing multiple drives on one heatsink.