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Maybe get a nice square of thin copper sheet (possibly even an adhesive-backed one) the size of an ITX motherboard, punch holes to match the standoff locations (so it sits down over them touching the case wall, not touching the motherboard backside) and use a thermal pad to couple the drive to the copper sheet to act as a heatspreader. The thermal mass should be sufficient to deal with heat spikes during normal use, and with a power consumption under 5W it should be enough to prevent thermal throttling under sustained loads by coupling to the case wall to remove heat more effectively (as well as being a larger surface area for any under-motherboard airflow).