TERRAMASTER D8 Hybrid HDD NVMe Enclosure USB 3.2 Gen 2 10Gbps Type C 8Bay USB Storage Supports RAID 0/1/Single/JBOD Exclusive 2 Plus 6 RAID Hybrid Disk Array, Diskless

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.

I purchased two of these to be used with a Plex server running on a Mac Mini, one for the main server and one for offsite backup. I populated both of them with WD RED NAS drives and everything is working great. I am getting around 200 mb/s per second on each drive. Considering the WD website says that the drives are rated at 180 mb/s, these speeds are better than I had hoped.It was extremely easy to setup as well and the Mac recognized the device without any drivers needed. I popped in the first hard drive and named/formatted. Once done I did the next. I did this for all four drives. I just popped in the next drive while the device was still on. I did this so that the drive names on the main server and backup would not only be the same, but in the same spot in the device. I am not sure how you would know which drive was in which slot if you simply threw all the drives in and plugged it in. This approach would be fine for most people, but I need the backup setup the same as the main so I can swap drives when necessary.My experience so far has been great. Drives showed up instantly, no issues with naming/formatting, speeds are where they should be, and no fussing with drivers/software. The drives also seem to sleep while not in use, which I like from a power saving perspective. This is a 24/7 server and having the drives go to sleep is an added benefit if they are not in use. I have had no issues with them waking up as soon as needed.The device is mostly silent. You can hear a slight noise when the fans kick on, but no complaints on the sound. The build quality is nice as the device is made of metal, except that the trays that hold the drives are plastic. Would have been nice if these were metal, but if pushed in properly they should hold up fine. The box also came with stickers for labeling the drives and additional feet in case they come off. This isn't a big deal, but I found it to be an extra nicety.