YottamasterAluminum Alloy 5 Bay USB3.0 3.5" Hard Drive Enclosure for 3.5 Inch SATA HDD Support 5 x 10TB & UASP -Silver

Just set this up today, and I'm doing a stress test. I installed five drives that were recently replaced in my file server. All were recognized immediately on startup with no need for any drivers or other setup. Just plug in, turn on and go.I'm now running long generic tests on all five drives simultaneously and monitoring the temperatures using CrystalDiskInfo. All five are running cool and temps are holding steady after several hours. Tests are running at normal speeds and the device is providing adequate power, connectivity, and cooling to all five.If I had to mention anything, it's that the drive rails are a bit tight and despite that, the drives aren't aligned exactly with the SATA connectors and it takes a bit of wiggling to get them aligned and connected. The door on the front is also a little flimsy and you can't see the LED indicators through it unless you are directly in front of it. The latch is also a little finicky, in that you have to press it much harder than expected to get it to latch, and it doesn't spring open. You have to pry it a bit with your fingernail.Those "complaints" are nothing though. My plan is to use this as a JBOD setup for a software raid and this looks like a product that will do exactly what I need it to do for a very good price.

The aluminum case is sturdy and attractive. It was easy to set up, just screw each hard drive into a tray and push it in. I've had it a few weeks and it is working well. I haven't tested transfer speeds but they're easily more than what I need, as I primarily use it for storage and a plex media server.The case fan is fairly quiet, but not "silent" as claimed. It has a humming tone and it is always on full speed regardless of current temperature. It is quieter than the hard drives themselves, at least, but it was disappointing how much noise it makes when all the drives are at rest. It was not hard to replace with a quieter noctua A8-ULN fan.The drive activity LEDs are not really readable without opening the metal door, unless you look straight down each hole, but usually I don't want to see them anyway, so this is preferred. The door is slightly awkward to open, but it does not need to be opened very often.The plastic trays will scrape against the sharp aluminum rails inside, so with repeated use they could become loose.The software downloads on the website do not offer a sleep time setting program for Mac. There is some sort of RAID Manager software for Mac, but it does not run, just crashes. If any software utility is needed, it is not provided here. Thankfully it seems to work well out of the box with no supporting software. (I do not use RAID, each hard drive is used as a separate drive.)

I put 5x 6TB drives and set it up as RAID 5 and get a combined 21TB storage out of it. It appears as a single drive in RAID modes. Then I took a Dell Wyse 5020, put Debian Linux on it, and use it as Network Attached Storage with a Samba server. I used a Wavelink docking station to format the drives before installation. Setup was easy, and I don't need any RAID management software. It's been working great so far. When it goes to sleep, it takes about a dozen seconds to show the contents again. The sound is minimal, mainly from the drives themselves rather than the fan. The inside plastic is a bit cheap, but that doesn't matter. The outer case is very solid and heavy.I accidentally got the non-RAID model at first, but Amazon accepted the return with no fuss. I also have a Synology NAS, but haven't hardly used it since getting this.

I bought this as a replacement for a Drobo that was dying but was very difficult to diagnose as causal to many weird problems. Not to mention that the company is in bankruptcy. I was happy to find this item. I needed simply a device that would function as a giant hard drive for my backups that allowed me to swap out disks when they failed. But, all I saw were confusing expensive NAS drives that required connecting through my router (vs. simply plugged into a an open USB port). These did many things I had no need for nor, in many cases, could even understand. This device, so far, setup VERY easily, runs quietly and is reliably working with my backup software. I don't have to pay it any attention. Which is exactly what I wanted and needed. And, the price was very reasonable. Can't believe there aren't many more people who want something like this.

Edit June 2021: I bought 2 of these units, they've been "weird". Like they work for a while then I'm not sure if they shut down or start dropping IO or if I have 8 failing HDDs. But one PSU definitely died in the last few weeks.Original review follows:----caveat: I've only used this for a few hours, and it's on an RPI4 + ZFS w/ RaidZ2. The tests aren't perfect but they're representative (though certainly limited by the capacity of the RPI4).I am replacing two dual bay USB2 devices on the RPI4, and I was able to benchmark before/after. Same FS (ZFS w/ RaidZ2 across only 4 drives), same host, same spinning media. I only swapped 2 enclosures for 1.Bonnie++ results show similar single-char and random seek results (e.g. no change between USB2 / USB3 for small workloads on a compute-intensive RAIDZ2).Bulk read and write performance are *double* on this quad-bay USB3 device, vs. a pair of dual-bay USB2 devices.The chassis itself is nice. The sleds are plastic, but reasonably substantial. The enclosure has the one huge fan, but it's fairly quiet (like, I had to put my hand over it to even know it was running). LEDs shine out the front, they're visible but not obnoxious. I really like it.