ACASIS40Gbps M.2 NVMe SSD Enclosure with Cooling Fan, Tool Free Installation, TBU401 Pro for M1 M2 Pro/Max, Compatible with Thunderbolt3/4/5,USB4/3.2/3.1/3.0/2, Support 2280/2260/2242/2230 B+M M-Key

When I originally received this enclosure it was missing the heat pad and the usb-c cable that was included was short and only capable of usb 2 speed so when I wrote my original review I complained about the low data speed (30MB/s) and the missing heat pads and only gave the product 3 stars. The enclosure was fine, the accessories were bad or missing.After a long email correspondence with Acacias Customer Support, which included pictures of what I received, they told me that the cable I got was not their cable and so I thought I might have received a device that had been shipped to someone else and returned without the heat pad and with a useless usb cable, and I ordered a replacement. The Acacias product package was not sealed so it was not possible to tell if it already had been opened.The replacement just came in and when I opened the package (it was also not sealed) it contained a proper Thunderbolt 4 cable and the heat pad, and when I tested it I received the kind of speeds I expected - about 2800 MB/s using the WD 1 TB 2280 memory. That makes it clear that I received the bad usb cable due to my original order having been returned to Amazon by another customer and not due to the fault of the vendor, so I have revised my review. This enclosure works very well, although it does get very warm and probably needs a cooling fan as well as the included heat pads. The speeds are everything I expected and the included Thunderbolt cable works properly. It is a bit short for me, but it is the length specified in the product description.I am happy with the replacement and feel capable of recommending it. If you want external drive speeds close to the speed of your computer memory consider this enclosure.---------------I recently bought the version of this enclosure that contains a fan for cooling and when I tried to leave a review Amazon told me that I had already reviewed it, although that version was the version without the fan, so I am adding this review to the end of the original review.While the original enclosure is a great way of adding high speed memory to your system it suffered from one drawback and that is it needs cooling. I solved the problem by buying a small muffin fan and attaching it to the enclosure and, with that, it ran cool and I had no heat issues. This new enclosure solves that problem and I have replaced the version without the fan with this one.This is a first class enclosure with transfer speeds as high, if not higher, than the internal memory of my Mac M2 Mini. Repeated use of the Black Magic speed app showed no slowdowns due to thermal throttling so it is dependable and fast, even after long use.Thee are some minor issues. First, the manual that comes with the enclosure is the manual for the version without the fan so it contains no information about the cooling fan. There is a small button on the side of the enclosure to turn the fan on and off, but even when holding the unit next to my face I could not feel air moving. To be sure that the fan was working I had to hold it next to my ear, and I could hear it running.There is also a small LED on the side of the enclosure and it shows a constant light when the fan is running and a blinking light when the fan is not running. I have picked up the enclosure during the day and found it to be slightly warm while the old enclosure was hot to the touch without the muffin fan I attached.This is a great enclosure and I believe that it deserves the 5 stars I have given it.

At first I thought it didn't work, and had even killed my Silicon Power 4TB UD 90 NVME SSD, but then I figured it out, and it is GREAT!I have an Apple M2 Pro Mac mini, and I also have a powered USB 3.2 dock with an NVME slot and multiple additional USB 3 ports. The Silicon Power SSD has been working fine for 4 months in the 3.2 dock, but of course it was only giving me about 1,000 MB/s. I ordered this to speed it up. However, when I first hooked this up the speed was fast only for a few minutes, then became very erratic and slow, as slow as 70 MB/s. I was afraid that the SSD had been destroyed, because when I installed in back in the USB 3.2 chassis the speed was still erratic. Others have written about these speed issues before, but I think I have it figured out. Now the speeds are consistently as shown in the screenshot, and that was taken WHILE I was synchronizing (downloading) a large Lightroom Cloud library to Lightroom Classic (which is what I have the SSD and enclosure for. So it was being hammered over a fast network connection and still gave those results. Some things I learned and early mistakes I made:1. I use both of the cooling pads from the beginning, to make sure they would contact the lid. No problem there.2. When I got the initial results, where it went fast but then became dog slow, I had it plugged into a Thunderbolt 4 port on the M2 Pro Mac Mini, but I also had a Sandisk SSD plugged into another port on the Mac mini. This was the source of problem #1. I tested it multiple times and always got poor results with this configuration.3. When I moved it back to the USB 3.2 enclosure I continued to get poor results, but I later that after reinstalling the SSD I had failed to plug the external power cable back into the USB 3.2 dock. So it was trying to run the SSD off the cable coming from the Mac mini to the dock, and this was not adequate. This morning I plugged the power cable back in to the dock, and the speed went back up to 1000 MB/s4. Then I moved the NVME back to the ACSIS dock, and plugged into a port on the Mac Mini, but this time instead of plugging the Sandisk SSD into the Mac Mini as I had originally, I plugged it into a USB 3.2 port on the dock. (It is only USB 3.2 anyway.). With this configuration it has been running fine for hours with the speeds shown.So I think this is all about power. I can't seem to run the Silicon Power SSD, in this chassis, on the Mac mini if I also connect the Sandisk SSD. But, and this is important, I'm not blaming ACASIS for this. It may just be a limitation of the Mac Mini's power output, and/or the Silicon Power SSD could me the problem. I'm assuming this is an M2 Pro Mac mini issue, as I don't have other enclosures/SSDs to test. But as long as you don't plan to plug an additional SSD into the native ports on the Mac mini this work great. I hope this helps.