ACASIS 40Gbps M.2 NVMe SSD Enclosure, Cooling Fan, Compatible Thunderbolt 4/3/USB 4.0, Support SSD B+M M-Key, Dual-Bay SSD Enclosure Dual Monitor Support Software RAID, 2 USBC 40Gbps for M1/M2/Windows

I am using a pair of these SSD enclosures to provide 4TB (main data storage) and 8TB (TimeMachine backups). I have these guys configured as RAID-0 storage for speed. Speed is > 2GB/sec and < 3GB/sec for large sequential file copying. I wanted to keep costs down, so instead of getting TB5 enclosures and TB5 rated SSD chips, I got the less expensive TB4 versions. Plenty fast enough for my purposes. When push comes to shove, TB4 is just as good as TB5 for random access I/O - which is what 90% of my workload consists of. Make sure to turn on the fans (there is a button). When I ran my first TimeMachine backup, the 8TB enclosure got hit. The fan cooled it off VERY nicely. These enclosures can be daisy chained. I have the 8TB connected after the 4TB. Very nice. Dead quiet.Have been using these guys for about 2 months with no issues. Value for $$$ is excellent. I recommend for anyone serious about using SSD for their main data storage and first level backups. I have used these guys on a 27” iMac and am currently using them on a Mac Studio.

I have 6 m.2 ssds I want to pull data off of, then use 2 as extra space for work. I inserted two of my m.2 drives to start pulling data off of them, and...This doesn't do anything when plugged in, I used 4 different computers, two macs, one windows, and a linux computer. I initially plugged it into my mac pro, no response, no devices detected, nothing.Red power light came on with the included power supply, when plugged into the mac pro, the two blue ssd lights come on, but nothing was seen by the mac pro.I then plugged it into my windows laptop. I unplugged the power, and put the power back in. Red light on, blue lights on, no reaction from windows. I opened up the device manager, unplugged, plugged it back in. Blue lights come on, but no reaction from the device manager.Repeated this with another windows computer, and my ubuntu laptop. No devices I plugged it into gave any indication that it was connecting, as if the cable just existed to light up the blue leds.I plugged a device into the secondary plug, and it charged it. I plugged a monitor in, nothing as well.Basically, as far as I can tell, the device just lights up the LEDs and acts as a power pass through, and does nothing else.I tried each m.2 drive separately after trying the first two, the first two were 970 evo's, the other for were 990 pro's. They were all working immediately before I pulled them from the computer 20 minutes before trying them in this enclosure. None of the drives worked, the device was never detected by any of my computers, and I returned it because it's expensive junk as far as I'm concerned.

I put two 4TB drives in this dual bay enclosure to create a NAS and it works great! The only thing I've noticed is it does get warm, even with the fan on. However, I have not noticed any issues with my NVME drives. I am using it on a Mac mini M1 which is connected to my network where other computers can also access the NAS. I don't have any complaints so far.

I installed dual 4TB Samsung 990 Pro PCIe 4.0 NVMe M.2 SSDs with the hope of using this device in a RAID 1 configuration to provide a redundant backup of my projects while I worked on them. But, unfortunately, any power interruption to the device corrupts both NVMe drives. For example, if your wife unplugs your wall adapter so she can move it to another outlet. Or, for example your dog bumps the cable. Boom. All your data on both drives is gone. I am so disappointed. I reformatted both and tried again, only to have it happen again. In the two days I have had the drive, I have lost both volumes 3 times. I'm lucky I was just testing and still had other backups. I'm using a Thunderbolt 4 port and do enjoy the speed. But I bought this for the redundancy, and it just doesn't do that.

This is, quite simply, one of the best investments I've ever made. And I mean that. I'd been looking for AGES for a dual NVMe SSD stick enclosure that is small, utilizes Thunderbolt connectivity, and — most importantly — runs COOL. Well, this one checks EVERY box. This enclosure is incredibly simple to set up… and it INCLUDES thermal paste strips which you can place on top of your SSD sticks! It has a small fan (you can optionally turn "on" or "off") which is INCREDIBLY quiet (you can barely hear it a couple feet away) but powerful! I've run the most demanding tasks on the SSD NVMe sticks which I installed inside… and the entire time, the enclosure remains cool. And I mean quite literally COOL to the touch. I will be recommending this to all my friends and fellow feature film editors. Bravo, guys.

I have used ACASIS products before, all with awesome experience and very high performance. This product, NO WAY!!!! - First, I was only getting 1500 throughput, when expecting 2500 or higher… second this BRICKED not one but 2 SSD’s!!!! YES BRICKED 2 SSD’s. The first one bricked was 4TB WD Black SSD, while a year old, worked perfectly in my other enclosures. The second was BRAND NEW - 8TB WD Black… BRAND NEW - was recognized then BRICKED… NOTHING - neither SSD is recognizable on any other computer, boot to recovery, command line recovery magic NOTHING. BOTH Gone. I am beyond upset about this. I have to now pay $200 plus to have the first one recovered professionally, what a WAIST. So - ACASIS lost a faithful customer for years. I have multiple ACASIS devices… they are all going in the garbage now… I’m NEVER dealing with this BS again. Get your S*** together.