TERRAMASTER D6-320 External Hard Drive Enclosure - USB 3.2 Gen2 10Gbps Type-C HDD Storage Hot Swappable Plug and Play (Diskless)

First of all, the reviews are conflating many different devices. The devices reviewed have notably different firmware and are designed and built differently. So the overall review is not really relevant. You'll have to wade though all reviews to find the ones applicable to the product you're considering.Anyway, the bad reviews I read got me suspicious and I had a set of tests awaiting it's delivery. It passed them all and I'm glad to report that the actual device matches the description.I've been using it with 6 drives configured as ZFS raid_z2. The drives were actually moved from an old box and had data on them. The array has been successfully imported. No loss of data.I plugged it to a USB3.2 gen2 port. The connection never dropped once.The performance is actually better than I expected, considering that it's a USB link (yes, I know USB3.2, but still...) and the drives are rotational devices. Granted it's not a fast nvme, but it's better than just OK.The enclosure I received included thin insulating sheets to be placed between the disk PCB and the mounting cage.They are thin enough to not block the air flow. Disks temperatures hover between 40°C and 45°C. It's a tad warm but I deem it OK.Now, the video on the vendor website doesn't include instructions about that insulation. It might means that the unit I received includes the latest fixes, which would negate some of the most frightening reviews I read. Indeed, having the disk PCB getting shorted against the cage is a sure way to kill it.So, hopefully I have the latest and greatest firmware and hardware.One last thing it's fairly quiet. No totally, but fairly acceptably so.After 2 weeks of using it, I'm quite happy.

I purchased the D2-320 2-bay RAID enclosure with USB 3.2 Gen 2 10 GbpsMy purpose with this unit was to mirror (RAID1) two 6TB WD Reds with a Linux machine. I’m not familiar with this brand, so I decided to test it a little before copying a lot of my files over to the D2-320.Getting everything working was pretty easy.I pulled out each bay, installing the drive was pretty easy, no screws needed. They provide a video on it if you’re unsure. I set the selector on the back of the unit to RAID1, shoved in both drives, connected the USB (drives are powered but won’t spin up until the USB is connected), then held the RESET button with the provided pin until the disk lights flashed. The system found one drive - as it should have.I wrote approximately 18K files and directories of various sizes to the array and then without disconnecting the USB or turning off the power, I pulled out one drive. I then connect the pulled drive directly to another computer to see that the files were in fact written to the drive. They were. All good to go.I replaced the drive. Both lights are green. Since no changes had been made to either drive, this is perfect, it didn’t try to rebuilt the arrayNext, I pulled the second drive out hot. Then connected that drive to the other computer and checked to make sure all files were also written to this drive as well. They were! It is working as it should be.I then created a couple files on the other drive and then replaced the pulled drive back into the D2-320. One drive light was blinking green, the other blinking yellow. According to the online documentation, this means it is rebuilding the RAID1 mirror. Perfect .. Everything is performing as expected. It did take a few hours to rebuild .. but these are 6TB drives, so that was expected.The USB cable provided seems adequate, USB C on both ends. If you need a different cable, consider that when purchasing.Average 1G file write 156 MB/s, average 1G read 221MB/s. Slow but these are mechanical drives connected via USB. Acceptable. Later, I watched a video using Jellyfin and reading, transcoding, and streaming worked perfectly fine.The large fan is quiet and seems to keep the drives cool. Airflow looks to be sufficient. How noisy the unit will be will depend on your drives. Some are louder than others.These drives will be part of a system I have in place which will be up and running 24/7. I’ll be very interested in seeing how well the Terramaster D2-320 performs in the long run. I’ll post updates after I have used them for some time.