The iStarUSA D Storm D - 400 Rackmount Enclosure is designed for optimal performance and reliability. This 4U rack - mountable chassis supports both ATX and microATX motherboards, making it a flexible choice for various setups. It features a sleek black and silver design, with three fan support for enhanced cooling. The enclosure includes four external 5.25" bays, one external 3.5" bay, and two internal 3.5" bays, providing ample storage options. Additionally, it is equipped with two USB ports for easy connectivity. The D - 400 is built to keep your hardware secure while ensuring efficient airflow and heat dissipation, making it ideal for server or cluster environments.