With the TerraMaster D1 SSD, TerraMaster brings to market a rugged NVMe enclosure aimed specifically at demanding users. In addition to a durable design with IP67 protection, the model promises reliable, silent cooling and stable transfer rates. In this review, we examine how the enclosure performs in everyday use with a high-end SSD, what level of performance is actually available, and whether the build quality and cooling concept are convincing.