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Works as I expected. Been using for about 2 months and have no issues or complaints other than not really knowing if the fan is turned off or on. Lost my high frequency hearing and have to guess @ the setting. Of course that does explain that the fan is quiet. Have a WD 2TB ssd and it works well. Actually the read & write is faster than my 256GB SSD in my Mac mini M4. No issues with heat -- I run TG Pro to monitor the temps and have been very satisfied with the performance. There are others out there but I went with Acacias based on reviews. No regrets at this time.

Impressive enclosure worth the price! This is my perfect enclosure! I am a professional video editor and I transfer video footage all the time using external drives when I need to be on the go. I can use it with pretty much all my devices to get the optimum speed since I paired it with a 2tb SK Hynix P41. I can get crazy fast speed on my M2 Pro Mac Mini using Thunderbolt 4 then use it on my Ryzen 7950x PC with the Gigabyte X870E Aorus Elite with USB4. Being backwards compatible I can then use it on my Dell laptop with USB3 or the Thunderbolt 3 port which ever is not being used since it charges through the type c connector. The fan is pretty much inaudible over room tone and can only hear it when holding it up to my ear. I keeps my NVME drive in the optimal operating temperature even under high loads which i can say about my other enclosures where I experiences thermal throttling. I know it's expensive but it is worth it to have such flexibility.

Reliable, fast, solid construction, easy to re/use with no tools, stays fairly warm This enclosure seems reliable, fast, easy to use, and is recommended (though a major caveat is I’m a first-time user of SSD enclosures and in the first month of use.) FEATURESThe enclosure is aluminum and seems solid. The no-tool installation was super fast and easy. ACASIS includes plastic spacers so SSD sizes shorter than 2280 are supported, plus there are couple thickness of thermal stickers ready to apply that help dissipate heat between drive and enclosure. The installation could not have been easier, plus it’s easy to pop open if needed. The kit also comes with a USB4 compatible wire that’s less than 12” long. That’s short but I’ve read this length is best for highest transfer speeds in USB4 so doesn’t seem a shortcoming of ACASIS.BASIC SETUP So far it’s been fast and reliable. My setup is 3-partitions on a 4TB drive connected to Thunderbolt/USB4 MacBook for Time Machine backups in one partition, SuperDuper! app weekly backups in another partition, and manual archive in a third. SPEEDY All seems fast, reliable, and compatible with USB flavors from 2.0-4. My SSD supports 3500MB/s transfer with actual rates in practice at around 2750. This is apparently expected performance via Thunderbolt/USB4. Regardless, it’s a helluva lot faster than my old USB3 SSD and platter setups with speeds of just 50-70! WARMThe enclosure does stay fairly warm, with added heat during backups. It’s not uncomfortably hot as I can easily tough the enclosure, but it is significant. I don’t have experience here so I can’t say if too hot or fine. Hopefully this won’t bite me later. TO FAN OR NOT TO FAN I was close to choosing an enclosure with a fan because I read lots of reviews about heat issues. I chose against it because there are even more complaints about whining noise and broken fans over time. I figured the fan would be tiny and prone to breaking with replacements hard to find. Then, I’d end up with an enclosure without a fan anyway. I’ll have to see if the heat is a problem over time. SATISFIEDAll told, this setup seems solid, fast, easy to re/use, and is recommended. Biggest issue maybe heat though it may not because it’s actually normal temp.

Works Great! Fast and reliable TLDR: This enclosure works great where previous 10gbps enclosures kept causing my computer to crash.I have an 2017 iMac with a Fusion Drive which is amazingly slow by todays standards, plus I had run out of storage. It is fairly straight forward to use an external boot drive on Macs, and so that's what I set out to do. I purchased a Crucial P3 Plus M.2 2280 4TB PCI-Express 4.0 x4 NVMe and an Orico USB 3.1 enclosure, with a 10 gbps speed. It sorta worked, but would cause my computer to crash pretty regularly, (sometimes multiple times a day) or enter boot loops that it would take hours to get out of. I tried a Sabrent 10gbps enclosure, and a second 10 gbps Orico enclosure, and they all had the same crash issue. I was at wits end and ready to buy a new computer when I figured I'd give a high end 40gbps thunderbolt enclosure a shot, and boy am I glad! As soon as I installed the SSD in this enclosure and booted my computer I knew I made the right call. Boot speed was noticeable faster than with the 10 gbps enclosures, and my computer has an uptime of 22 days now with no issues. It's faster than ever and reliable! I was a bit put off by the $100 price tag, but it saved me 10x on the cost of a new computer! Would definitely recommend.

Great, affordable DIY high speed Thunderbolt 4 external drive Acasis is recommended by YouTuber Kyle Erickson, and I ordered this TBU401 case the same night that I watched his two excellent videos on assembling a high speed drive for macOS use. Paired with a WD_BLACK SN770 2TB drive, I have a super-fast, super-capacity drive to use with my Mac Mini and Macbook. This is a great enclosure, solid metal, snaps together with reassuring firmness, and fits in the palm of one's hand. Based on the JHL7440 Intel Certified chipset, this clocked amazing speeds from the WD SSD. Formatting for macOS Sonoma took only 15 seconds.This is very nicely packaged, and comes with all you need except for the M.2 NVME SSD.Unfortunately, the very next morning, as this was being delivered, Amazon offered up a $10 coupon on this and its newer version TBU405 (with improved heat dissapation, and in a dark color matching my MacBook's Midnight finish). Sorry Amazon, but if you're doing that, I'm using my Prime membership return privileges. The TBU405 is just as nice, and includes all the same accessories: Thunderbolt 4 cable (about 14"), rubber retainers, two heat sink pads. I'll review the TBU405 separately, but suffice to say that this is a solid purchase, and I'd gladly buy a spare for travel.

Zoom 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.

Best Way to get a Screaming Fast External Thunderbolt SSD This enclosure (along with most other Acasis, Orico, ...40gbps NVME ones) will get you the fastest external SSD available at a value price vs. the top-rated $300 yet ~500MB/s slower Sandisk Pro G-40 1TB. However it did take quite a bit of research to understand what speeds to expect with my M1 Pro MBP and what SSD's to try.With Black Friday pricing I spent $155 on this enclosure along with a 500GB WD SN770 SSD (it would've been $185 for the 1TB). With my MBP I get 2,750/2,300 MB/s R/W per Black Magic. I fortunately had learned before the purchase that these results (mainly the write speed) depends on the PC/Mac model, CPU and SSD installed in the enclosure; and that my MBP TB4 ports throttle the write speeds down by 400-500MB/s (oh well...2,300MB/s is still crazy fast). With an M1 Max Mac, M2 Mac Air or a higher-end Intel PC I'd probably get 2,700-2,800 MB/s write speeds which is close to the max for a TB3/4 port. OTOH the M1 Mac Air TB4 port seems to greatly throttle the write speeds down to ~1,500 MB/s.Most of the research time I spent was on selecting an SSD that would provide the fastest speeds at the best price. The best choices I found are the value-priced NVME Gen4 SN770, 980 Pro or Rocket 4 Plus (I tried all three and they gave similar results unless you need the superior sustained large file write speeds of the 980 Pro). Spending more on the SN850x or 990 Pro won't give you a faster enclosure/SSD combo. OTOH Gen3 SSD's will definitely result in slower speeds and I also read about possibly slower speeds from some other quality Gen4 SSD's like the Crucial P5 Plus, Hynix Gold...).As for this particular Acasis enclosure (or the similar Ankmax):I really like its tool-less design and quality/solid construction (and it's sleek looks don't hurt either). I also tried the Orico M2V01 and really didn't like that it uses one ridiculously teeny screw to hold the the enclosure's cover in place (i.e., to get the cover on tight-enough to stop it from rattling I had to tighten it down well-beyond the torque level I'd feel comfortable with for something that small, and, even though this Torx head screw and the provided screwdriver seemed to handle the torque, I can't imagine it won't strip eventually).The only downside of the Acasis's tool-free design is that it makes it difficult to "feel" whether the thermal padding is thick-enough to make good contact with the cover (i.e., the cover's spring-loaded detent system pulls the top into place and masks this "feel" vs. the screw-on cover of the Orico). I came up with a couple of blacksmith-engineered techniques to determine if the padding was thick enough so I'm now mostly-OK with that issue.Perhaps an enclosure that uses four screws to hold the cover in place, like the Siliking, might be the best compromise between a tool-free design and one that uses a single teeny screw to hold the cover in place? Either way this one's a winner!

Fast, solid, good heat dissipation For a few weeks now, I been using a few Acasis NVMe M.2 enclosures for multiple Mac computer systems connected to Thunderbolt 4 ports.Especially the TB405 and the TB401 (for this specific review). The drives I have tested them with are the Samsung 980 Pro 2 TB and the Seagate FireCuda 530 4 TB.So far, the enclosure has been very reliable and fast (I mean fast …).For the Samsung 980 Pro 2 TB:- Blackmagic V3.4.2: o Write 2,817.2 MB/s o Read 2,708.6 MB/s- AmorphousDiskMark V4.0: o Read: 3,101.55 MB/s o Write: 2,937.15 MB/sFor the Seagate FireCuda 530 4 TB- Blackmagic V3.4.2: o Write 2,612.9 MB/s o Read 2,625.3 MB/s- AmorphousDiskMark V4.0: o Read: 3,116.61 MB/s o Write: 2,722.06 MB/sThe Samsung a little ahead for the Seagate FireCuda.The Aluminum casing sitting on top of my metal monitor stand does a great job dissipating the heat.We have used as well external SSD’s (Samsung T5 and T7). Both of those got constantly real hot and very uncomfortable to touch. Not so the NVMe with the Acasis enclosure. During video rendering the temperate does increase, but never to the level of the external SSD’s.Cost:This enclosure together with the fast Samsung 980 Pro 2 TB is less than $400, while the Samsung X5 is still at $900.Especially the TB401 is very easy to install, and the little extra work compared to an off the shelf solution, gets you great speed for less than half of the cost.Summary:This is a fantastic enclosure which works well with the Samsung 980 Pro and Seagate FireCuda 530. It provides excellent reliable speed with good heat dissipation. Just make sure to use the Thermal Pads to make contact between the drive and the enclosure (probably use both which are provided).Overall this enclosure is a solid winner.Personally between the two versions TB401 and TB405, I prefer the TB405. It seems to dissipate heat even a little better with the corrugated surface. However, the TB401 is easier and faster to install. Both are great!

Thermal pad doesn't touch the case I'd rather give 4.5 stars because this only matters during sustained read/write - but to be honest that's most of my use case since... for anyone using this regularly instead of doing fully drive backup/restore, it won't matter at all.Still, it'd have been nice if the thermal pad were thick enough to bridge the air gap between the drive and the aluminum case. As it is, the drive is fully surrounded by air so it will thermal throttle during sustained load.