Yottamaster 4 Bay RAID Hard Drive Enclosure, Aluminum USB3.0 RAID Enclosure for 3.5 & 2.5 Inch SATA HDD/SSD, Support 72TB(4x18TB) Direct Attached Storage DAS RAID1/5/10/JBOD/CLONE [PS400RU3]

I recently purchased this product from Amazon and found it to be good quality and as described. It was easy to use and arrived on time and in great condition. The design is practical, and it seems durable. Overall, a solid purchase that I’m satisfied with. Would recommend.

Garbage. Plenty of bits of plastic from the drive trays all over. Read and followed the instructions for enabling RAID 5. Did not work. RAID 10 appeared to work and would have been fine, but at that point, I can't trust the device to function correctly long term. Contacted support and received no response.

I was ready to love this product at first sight for its simple, industrial design and good looks, but discovered that although it has good sides to it, it also has important limitations, and comes with very scant documentation. The good: solid aluminum housing with excellent heat dispension, very quiet fan, excellent esthetics, great capacity, RAID 0,1,3,5, and 10 and JBOD. The bad: flimsy door, flimsy, but functional trays. The software has very limited features, and the manual is outright poor. Two designated pairs of RAID1 is not offered. The ugly: After losing all my data repeatedly to I/O errors and an unexplained corruption of volumes, and on the verge of returning the whole device, I had to learn through user comments and FAQ's it has to be connected directly to the computer and not via a hub, replicator or docking station. Many frustrating hours later, I have it connected it DIRECTLY to a micro computer I had laying around, and lo! though fast no more, my new now 20TB RAID10 DAS-inadvertedly-turned-NAS hasn't missed a beat since, storing 22 years of digital photography - though I have kept separate backups for that special day in the future. Though this setup happens to suit me well for my needs, it might not be everybody's definition of sexy.

Pros: I got both their 4bays and 5bays HDD enclosures. They are great if you go by their price. Cons: The screws that supplied by the enclosure doesn't fit on the 2.5 SSDs drives I had. Both enclosure are big and heavy even without the HDD inside. The LED in the front are dim and barely visible to see.

I bought the 4 Bay RAID enclosure and outfitted it with four 12 TB Seagate Ironwolf drives in a RAID 5 setup. Setting up the RAID went smoothly, following all of the manufacturer instructions. Read/write speeds were good, and the RAID could be seen on both my Windows and Mac computers. I copied about 14 TB of data to the RAID and things were going great. Fast forward about 9 months later, read/write speeds started to get a little wonky. It had me concerned and I thought about backing up the RAID. Too late, as today I tried accessing the RAID and neither my Windows or Mac computers can access the RAID. Windows gives a straight up "file system is corrupted" error and my Mac can't see any of the folders but does show that 14 TB of data is in the RAID. I'm going to keep on trying to recover the RAID, and if successful I might adjust the rating. However, lesson learned. This is what you get for trying to do things on the cheap. Edit to add: I was able to recover my data from the RAID. First, I used some data recovery software to pull my files off the RAID and onto my internal HD. With 14 TB of data involved (including a deep scan), this took a few days actually. Then I compared the retrieved data with my backups of the RAID (it helps to be a digital pack rat - while I didn't have a dedicated RAID backup, I did have all of that data saved somewhere on a couple of external HDs. Good thing I hadn't gotten around to repurposing them!) and discovered that the recovery software got about 95% of the files back. I then found the remaining 5% on those HDs. I then consolidated all of that data, reformatted the RAID, and copied everything back onto it. Write speeds were about what they should be and so far have had no issues accessing data, so I reckon it's ok again. Still, I won't be using this as my only storage solution. Moving forward, I'll keep my working data on my internal HD, store a backup of working data and archive data on the RAID - which itself will also be backed up onto 2 dedicated external HDs. Better safe than sorry.

We ordered 2 units to serve as 24/7 as file server and plex media server. (we returned both, read on if you want to see why.) Pro: - we liked the thick aluminum enclosure which can be stacked and also placed side by side, if you have multiple. - the setup is very simple by selecting raid mode via dip switches on back. - the fan is quiet but keeps the drives cool. - the drive light are hardly visible when the front door is closed. - the transfer rates in RAID 1 and 10 are good. About 190Mb/sec (write speed) 200Mb/sec (read speed) in either mode.he Cons: - the power plug design is awful. One units plug was so lose, that it came undone soon as you touch it, or move the enclosure slightly. - the enclosure has a sleep mode build it, which puts the drives to sleep within a few minutes. We tried to disable it via the YottaMaster firmware tool, but the tool proofed to be useless. No matter what time you set or completely disable the sleep mode, the enclosure confirms the setting, but it doesn't change a thing. This was the reason we returned both, because our servers needs to run 24/7. (Besides the delay due to the sleep mode, the constant on/off will kill your hard drives.)