Adopting the USB3.2 Gen2 protocol, the D2-320 offers a data transfer bandwidth of 10 Gbps with an actual read/write speed of up to 521 MB/s with 2 hard drives installed (Seagate Eoxs 22TB X2 RAID 0); with 2 hard drives installed, the read speed of 1075 MB/s could be achieved (SAMSUNG 870QVO 1TB SSD X2 RAID 0). The D2-320 supports up to 2 hard drives and a maximum capacity of 22TB (compatibility with larger hard drives has not yet been verified), providing users with up to 44TB of storage (22TB x 2). The D2-320 is compatible with various hard drives, e.g. 3.5" and 2.5" SATA hard drives as well as 2.5" SATA SSD hard drives. Note: Using an incompatible hard drive may cause your device to disconnect, run slowly or not recognise the hard drive. The D2-320 features a tool-less hard drive tray design that allows for easy installation and removal of hard drives without tools. In addition, the D2-320 features TerraMaster's unique push-lock design that automatically locks the hard drive tray when you insert the hard drive, preventing the hard drive from falling out or coming loose. As a result, installing a hard drive takes less than 10 seconds, providing great convenience for users who frequently swap hard drives to exchange data.