ACASIS 40Gbps M.2 NVMe SSD Enclosure with Aluminum for Thunderbolt 4/3/USB4

I am blown away by the speeds that this SSD enclosure can deliver. I've got mine paired with a Samsung 990 PRO 4TB SSD and plugged into the Thunderbolt port of my Mac Studio. I'm seeing read/write speeds in the 2700 MB/s and 2600 MB/s range, which is so much faster than my previous 10 Gbps enclosure (which was achieving roughly 600-700 MB/s speeds). And this is with the SSD about 45% full. I use my system for video editing 4K content, and the scrubbing speed on my timeline has become instantaneous. I can quickly scrub through the timeline or jump to different parts of the video with ease... no lag anymore! Installation was super easy... just open the fully aluminum case, insert the SSD and rubber mounting plug, then push the SSD into the enclosure (no screws or screwdrivers needed). Close the cover and you're done. My Mac recognized the drive immediately. The enclosure can get warm (to slightly hot) when I'm rendering a long duration video, but that's expected of any SSD or hard drive. To keep the enclosure (and SSD) cooler, I keep the enclosure on top of my Mac Studio (which has an aluminum shell)..... this helps to dissipate heat a little better than if I were to place it on my wood desk surface. The enclosure looks great; it's sleek and minimalistic with cleanly milled heat-sink grooves. And the all-aluminum design is very-nicely machined and matches the design language of my Mac, awesome! I don't have a PC, but this is fully compatible on my Mac Studio running the latest MacOS.

I was having a hard time deciding which enclosure to buy. I decided at last minute to try this one. it is very easy to install. if you have a gen 4 nvme SSD Western digital hard drive then this enclosure is cool to the touch. I am getting 2600 to 2800 for speeds. this enclosure is really fast with just a 10 GB file in 5 seconds tranfers speeds. This was the cheapest thunderbolt enclosure that I could find on amazon. I am impress it come with a real thunderbolt 4 cable. I highly recommend this encloure

I tried two different SSD brands and sizes, and the Disk Management did not see either. I tried the two drives in an SSK enclosure, and both worked. I tried reseating the SSD and with different known good cables on the ACASIS and Disk Management did not see either SSD as it did with the SSK enclosure. The bad thing is I purchased this enclosure early last year Mar 31, 2025 and it sat in my desk drawer until I was able to get a new Samsung 990 Pro so it is out of date to send back for a replacement. I had several older 10Gbps and a HAYOOVANT 40Gbps case that all work. The HAYOOVANT was no longer available, so I ordered the ACASIS which cost more and did not work. I should have checked it when purchased. My bad! Let that be a lesson to check purchases if they are not going to be used for a while.

Very nice case, but get a fast enough SSD unit for it. I originally had a "Crucial P3 PCIe Gen3 NVMe 1TB SSD, Up to 3,500MB" SSD in there, & that was not very fast. Time Machine backups were estimating at 20 hours! I replaced it with a "Seagate FireCuda 530R SSD 1TB Internal Solid State Drive - M.2 PCIe Gen4 ×4 NVMe 1.4, speeds up to 7400MB" & as you'll see in the picture, I am now getting speeds almost as fast as a Samsung EVO Plus SSD. In addition, I am going through a Caldigit Thunderbolt 4 dock, not plugged directly into my 2025 Mac Mini. So this device can definitely, with the right SSD, deliver the speed.

Works as expected. Great speeds. Runs pretty hot.

Incorrectly advertised, this only reads at Thunderbolt 3 on a brand new MacBook Pro M4. Could not get SSD to even show up to be mountable no matter how many times I tried to format. Ultimately went with a brand I had more history of reliability with. Would not recommend. Cable is a good length on a positive note and build quality is pretty nice but at the moment it's a paperweight on it's way back to them. I uploaded proof it wasn't just my drive or a bad cable, just in case someone else goes through this. I was able to use the cable from it on another enclosure just fine.

fast and quiet

Works great.

Easy install and plug and play product ,with samsung 980 NVMe M2 i was able to achieve 2754 MB/s Read & 2802 MB/s write speed perfect for 4k video editing directly from external ssd instead of copying to my local. Best product and very much satisfied.

Works like a charm. No heating issue observed so far. Using WD SN770 2TB with my mac studio m1 max. Giving expected read and write speeds. Value for money product.

I bought this Thunderbolt 3 SSD enclosure (Model B0DD34LH8R) to upgrade my Mac Mini M4, which came with only 256 GB of storage. I paired it with a 2 TB WD Black M.2 SSD, applied the thermal pad(both side of the ssd) (heat tape), closed the case, and cloned my internal SSD using Carbon Copy Cloner (CCC). After switching the boot drive, my Mac now runs from the external SSD smoothly — effectively turning it into a 2 TB Mac Mini without paying Apple’s huge storage premium. Performance is excellent — I get around 2800 MB/s read and write speeds, which matches the Mac’s internal drive speed since it’s already throttled around that level. Thunderbolt 3’s 40 Gbps bandwidth is fully utilized. However, the product description says it has a cooling fan, but it actually doesn’t. That’s misleading. Fortunately, the aluminum body and heat pad manage temperatures decently, but under heavy transfers it can get warm. ✅ Pros: True Thunderbolt 3 performance (~2800 MB/s) Solid aluminum body and premium build Easy setup and bootable on macOS ⚠️ Cons: No fan despite the claim Gets warm during long transfers Overall, still a great enclosure for Mac users, but the missing fan description needs correction.

Failed after just a month of use. There is no warranty so be aware before you buy it.

It works well as advertised. It heats and since it is metal and has no fans, you can feel the heat. Can only be used in thunderbolt 4 and above. For the price, it is a major limitation