The TerraMaster USB DAS 04Bay D4-320U is a direct-attached storage solution designed for professional data management and backup needs. This enclosure with four bays supports 3.5-inch SATA hard drives with a maximum capacity of 80 TB when using 20 TB drives per slot, providing significant storage expansion for workstations and small office environments. With USB 3.2 Gen 2 connectivity and transfer speeds of up to 10 Gbit/s, the device ensures efficient data access and file transfers. The aluminum alloy construction measures 210 mm in width, 125 mm in height, and 230 mm in depth, weighing approximately 2.2 kg without drives. It features a built-in 120 mm cooling fan with intelligent temperature control to maintain optimal operating conditions between 5 °C and 40 °C. The tool-free drive bay design allows for easy installation and maintenance, while the status indicators on the front panel provide clear operational feedback. Compatible with Windows 10/11, macOS 10.14 or newer, and Linux kernel 3.10 or higher, this storage solution offers flexibility across multiple operating systems. The power supply delivers 120 W output with a universal 100-240 V AC input, ensuring reliable performance in various electrical environments. Designed for users who require expanded storage capacity without network dependency, the D4-320U serves as a practical solution for data backups, media editing workflows, and general storage expansion needs.