Yottamaster 4 Bay RAID Hard Drive Enclosure, Aluminum USB C RAID Enclosure for 3.5 & 2.5 Inch SATA HDD/SSD, Support 72TB(4x18TB) Direct Attached Storage DAS RAID1/5/10/JBOD/CLONE [PS400RC3]

A great basic RAID enclosure for an unbeatable for the price. People in the comments complaining about the fan noise (my PC playing Skyrim is noisier) and can't hot-swap drives (take the 3 seconds to unmount the drive, you babies), it's ridiculous. If want enterprise features, buy an enterprise level RAID. This one will suit most everyone's actual needs who wants to have a safe drive for their home computer.

I put in 3 WD 4TB red drives to set up a RAID5. Initially this unit worked well. Running winsat speed test showed===RAID5 3 WD disks:> Disk Random 16.0 Read 1.04 MB/s 3.1> Disk Sequential 64.0 Read 118.57 MB/s 6.9> Disk Sequential 64.0 Write 146.46 MB/s 7.1> Average Read Time with Sequential Writes 4.040 ms 6.3> Latency: 95th Percentile 33.422 ms 2.9> Latency: Maximum 49.449 ms 7.9> Average Read Time with Random Writes 14.005 ms 3.6===I was quite happy. But after 3 months and 1TB data into the disk, now the write speed is slower than a usb 2 thumb drive.===> Disk Random 16.0 Read 1.08 MB/s 3.2> Disk Sequential 64.0 Read 119.48 MB/s 6.9> Disk Sequential 64.0 Write 5.37 MB/s 2.4> Average Read Time with Sequential Writes 18.875 ms 2.6> Latency: 95th Percentile 42.837 ms 1.9> Latency: Maximum 65.635 ms 7.8> Average Read Time with Random Writes 24.457 ms 1.9===I tried to reach the seller through both their website and amazon message. couldn't reach them, thus posting this as a review. Now that the return window has passed, I don't know what I can do with such a sloppy drive.

I bought this to house a RAID array for my nVidia Shield Pro and KODI. It works well for this purpose.It has a nice solid feel about it, with a very thick and substantial housing. It is very quiet, and has an 80 mm fan which could be easily replaced if it fails.The performance in RAID 5 mode is disappointing. It is supposedly USB 3.1 (with USB-C connector). I added four Seagate IronWolf drives. Never saw more than 30 MB/sec while writing to it with a Lenovo ThinkCentre. Speed is not terribly important in this application for me, but it did slow me down quite a bit when I was copying content to it.Here's the important thing to know. I come from an IT background. I am accustomed to using a utility to configure the RAID. It does have a Windows utility (and a Mac version). I set the array up using the Windows utility. My objective was to format the array as NTFS using a Windows 10 PC, and then copy everything over to it with the PC. The Shield will handle whatever file system you throw at it.But, when I hooked it up to the Shield, it would not work. Shield recognized it, but said it was corrupt.I tried plugging it into multiple computers, including Windows 7 and Mac. Only the Windows machines would see the array.So, I formatted it again using the DIP switches on the back of the unit, and it was then available on every platform. I assume when you set it up with the Windows utility, it writes some sort of disk signature on it that only Windows can recognize. With the DIP switch config, you can still see it with the utility, but it does limit flexibility. For example, it is not possible to set up two discrete arrays.I downloaded an incomprehensible hot fix that is supposed to fix an issue with sleeping. I don't want it to ever sleep. All you could do with the hot fix utility is run it, with no information about whether it was successful.Every once in a whie, I hear the thing make noise like the disks are spinning down and back up. It was concerning at first, but it has yet to create a problem five months later. I hope it remains reliable.Finally, despite the quality feeling of the enclosure, the fron door is flimsy, and the drive trays are plastic. Metal trays would have been nice for cooling (although cooling has not been an issue).The drive LEDs are blue when idle, and purple under access. They are actually quite hard to see unless you are lookikng straight on at it. This is fine, as the resting place is in the living room under the television.The lights and lack of noise make it perfect for living room entertainment purposes.I think this would work very well with a Mac, too.

Used this for a raid 10 array (HDD 16GBx4) for editing video and redundancy. Needed a hardware RAID as well so that my computer's resources weren't being tied to software.RAID. 222MB/s Read 217.8 Write Speeds on an i7-9700K 3080ti.Setting up the raid was done in under 5 minutes. This is a great product so far.

Slow transfer speed, constantly disconnecting from my computer.

Worked ok with 3 drives installed. Adding the other 2 (5 total) and making it raid 5, overloaded the power brick and shut down the enclosure. Each drive individually worked fine until all 5 were installed, then either the power supply drops instantly or lasts only a couple minutes. Have a 4 bay yottamaster that has been working fine for over a year. Waiting for the 5 bay replacement to hopefully get my raid array back up

Added 4 disks, set up in RIAD5 and its running over a week.

cons: the switches in the back to set the raid mode did nothing I had to do it with software, when it goes to sleep mode takes a few seconds to response.pros: really silence, and works