TerraMaster today rolled out the D4-320, a 4-bay USB DAS enclosure. This is essentially a 4-bay sibling of the D2-320 enclosure that the company released in January. The enclosure features four 3.5-inch caddies with SATA 6 Gbps backplanes, and hotplugging capability. These are connected to a SATA AHCI controller, with a USB 3.2 Gen 2 upstream link that has 10 Gbps bandwidth, and support for UASP (USB-attached SCSI). A type-C cable is included with the DAS. The drive cage is cooled by a 120 mm fan that draws air through the caddies, and exhausts from a vent at the back. TerraMaster says that it put a design focus on optimizing this fan, and reducing the noise and vibration of the device with a full-house. It's important to note here, that the DAS has no RAID function, so each of the four disks and their volumes are individually mounted by the host. There are link/activity LEDs for each drive. TerraMaster includes a first-party data backup software. Available now, the TerraMaster D4-320 is priced at $190.