Works fast when it works but it runs really hot and works worse when it’s hot. Also the wire connection was unstable so I had to buy a different connector. Not impressed for the price.

Works good with both USB 3.1 and Thunderbolt 4. M.2 SSD maintained good temperature while copying large files.

I’ve been using the UGREEN 40GB Enclosure with my Samsung EVO 970 Plus SSD, and here’s my honest experience after testing it thoroughly.Build Quality & DesignThe design is sleek and premium, with a solid aluminum casing that feels durable. Installation was simple, and I appreciate that UGREEN includes a thermal pad, a screwdriver, and an extra screw—small details that make a difference. The package also comes with two cables: a USB-C to USB-C (Thunderbolt) and a USB-A to USB-C, making it versatile for different setups.One of my favorite features is the silicone grip, which adds protection and makes handling safer, especially since the enclosure can get warm. Its compact size also makes it very portable, which is great for on-the-go use.Performance & Heat ManagementRight from the moment it’s connected, the enclosure gets warm and heats up further during data transfers. While this is expected for NVMe enclosures, the heat level feels noticeable.The built-in fan does help with cooling, but it has a slight noise. In a work environment, it’s barely noticeable, but in a quiet home setting, you might hear it when everything else is silent. However, the noise isn’t loud enough to be disruptive.Connection StabilityThis is where I faced some issues. I experienced frequent disconnections and automatic reconnections, which interrupted my workflow, especially since I initially used it to install and run apps on my Mac mini M4. This became frustrating as it caused apps to crash or stop working. (I installed Xcode & Android Studio), I know they're heavy, but the connection also happened even before installing those heavy ones, you would only notice when a warning appears on your screen saying that it's re-connected, but that will in a second cause your Apps to freeze, and you're work to be lost.Because of this, I stopped using it for apps and instead repurposed it for Time Machine backups and general storage. Since making this change, I have had no issues so far.Speed & CompatibilitySpeed tests on my Internal Mac mini M4 (256 GB Model) showed read & write speeds between 1900-2700 MB/s, while for the EVO970 Plus in the UGREEN 40 GB Enclosure it shows 1400-3000 mb/s. which is slower than the SSD’s or Mac Capabilities or even the Enclosure features, but due to I have no other read SSD to test, I cannot actually determine where the slowing coming from, but I thought it’s worth noting.

Works great, easy to use

Bought a new Mac Mini M4. Also, bought a Samsung 990 pro 1TB to put in the enclosure. Everything connected fine but as soon as I connected it to the Mac the fan came on after about 5 minutes and does not turn off for as long as I'm using the Mac.I have since found out that the fan comes on after the drive reaches about 45 degrees Celsius.To make matters worse the fan is very distracting (high pitch whine) and there seemingly is no way to turn the fan off. ALWAYS ON!When I googled this issue, there seems to be others who are complaining of the same thing.I can't send it back as I need the info thats on the drive. Stuck with it! Going to order another enclosure. Maybe one that passively cools this time.When I'm wearing headphones I cant hear the fan. But when i'm not it can get annoying real quick.

Enclosures get hot, I bought this one because of the fan. It does nothing and after about 10 minutes of use, it will disconnect due to the heat. Once it's hot, transfer speeds are about 100+MB/s .. I will be getting a refund and suggest you save yourself the trouble of buying this only to return it.

Using it with my new Mac and wanted a dependable fast drive. This hits the mark on both accounts. The ease of installation a good size heat putty and solid construction has made using a 2tb drive fast and efficient. I use these drives for remote work and to get additional storage instead of paying those exorbitant storage costs from Apple. Does not slow my work down and will be purchasing at least on more for my other 2 tb drive.

Recommend for Gen4 NVMe drives on Mac. Works better than expected, fan is a little loud.

Looks neat, the sheath it goes into is non-slippery and holds the enclosure in place. My main gripe with the product as a whole is it comes with a short thunderbolt cable... about 6 inches and I can't comfortably use it. I have to prop it with something for it to reach the thunderbolt port at the back of my pc and not cover up any of the coolings vents on either side of the enclosure. It does get kind of hot and if you block a vent, it will overheat and cause issues in performance, including your PC loosing connection to the SSD.

very fast, maybe the fastest in the market, The flip side is that the included cable is terrible and keeps disconnecting, I upgraded to a real USB4 cable and the disconnections stopped.also the design of the cooling system could be better, the enclosure still gets over 45c

Ce boîtier pour SSD M.2 est non seulement efficace, mais également super rapide grace à sa connexion par USB4 ! Il est aussi super pratique à assembler puisque il s'ouvre et se ferme par le biais d'une seule vis, ce qui est utile si l'on souhaite changer régulièrement de carte M.2, e plus, il est compatible avec plusieurs dimension de carte et aussi plusieurs interfaces de communication NVMe PCIe M et MB Key.Sa conception est de grande qualité comme toujours avec UGREEN ! Le boitier est intégralement en alu gris et est recouvert d'une protection en caoutchouc pour limiter les dégâts en cas de chute, un atout indéniable pour la sécurité de nos donnés. À l'intérieur, la carte M.2 est maintenue en place par une petite vis à entretoise (fournie en 2 exemplaire en cas de perte), offrant ainsi une solide fixation de la carte. Un autre aspect crucial est le système de refroidissement, qui est assuré par un le couvercle qui sert de dissipateur thermique et un pad thermique faisant la jonction entre les deux avec en prime un petit ventilateur qui s'active lors de monté de température et cela fonctionne très bien, après un transfert de données de deux heures à pleine vitesse, le boîtier était à peine chaud et sans ralentissement de débit.Abordons ensuite la question des débits. Le boîtier utilise l' USB 4 qui est le dernier protocole en date et qui permet d'atteindre des vitesses théorique de 40 Gbits/s. Comme l'illustrent mes photos les débits mesurés sur ma LegionGo en USB4 sont de 3691 MBits/s en écriture et 5066 MBits/s en lecture (en séquentiel). On peut donc conclure que ce boîtier remplit parfaitement son rôle !Enfin, deux câbles sont fournis, un USB-C 4.0 vers USB-C 4.0 ainsi qu'un USB-C vers USB-A 3.2, les deux d'environ 20 cm.

The product feels solid with no rattling. I paired this with the Samsung 990 PRO NVMe M2 SSD and got 3,000 MB/s readwrite speeds. It can probably be faster with different cables or something but for now it's good enough.The cooling just sucks. I don't understand why there's a fan inside when it seems like the heat is being exchanged through the thermal pad to the lid of the enclosure. The lid appears to have short fins like a heat sink.I migrated 1.8 TB to this drive and it handled it OK. The enclosure got really got and disconnected a few times (probably due to heat). I ended up using an external fan to flow on top of the lid to keep it cool.I'll have to use this for a few months as my primary storage for video editing. This was by first step in building some kind of storage solution at home. I wanted to buy an SSD enclosure so that I can use the SSD until I can eventually piece together a RAID or NAS solution.

ASUS ZenBook Flip (UX363EA), 11th Generation Intel Core i7-1165G7 @ 2.80GHz,16.0 GB RAM, Windows 11 Pro (23H2, 22631.4317), Thunderbolt4 portSSD: Samsung 990 Pro 4TB PCIe 4.0 M.2 2280Previously used a WAVELINK 40Gbps M.2 NVMe SSD EnclosureDefault Test results with that enclosure were very disappointing! * Returned the WAVELINK 40Gbps M.2 NVMe SSD Enclosure------------------------------------------------------------------------------CrystalDiskMark 8.0.5 x64 (C) 2007-2024 hiyohiyo Crystal Dew World: https://crystalmark.info/------------------------------------------------------------------------------* MB/s = 1,000,000 bytes/s [SATA/600 = 600,000,000 bytes/s]* KB = 1000 bytes, KiB = 1024 bytes[Read] SEQ 1MiB (Q= 8, T= 1): 1601.708 MB/s [ 1527.5 IOPS] SEQ 128KiB (Q= 32, T= 1): 1617.213 MB/s [ 12338.4 IOPS] RND 4KiB (Q= 32, T=16): 1143.542 MB/s [ 279185.1 IOPS] RND 4KiB (Q= 1, T= 1): 81.331 MB/s [ 19856.2 IOPS] [Write] SEQ 1MiB (Q= 8, T= 1): 446.343 MB/s [ 425.7 IOPS] SEQ 128KiB (Q= 32, T= 1): 443.663 MB/s [ 3384.9 IOPS] RND 4KiB (Q= 32, T=16): 426.235 MB/s [ 104061.3 IOPS] RND 4KiB (Q= 1, T= 1): 1.015 MB/s [ 247.8 IOPS] Profile: Default Test: 1 GiB (x5) [E: 41% (380/931GiB)] Mode: [Admin] Time: Measure 5 sec / Interval 5 sec Date: 2024/10/07 23:43:25 OS: Windows 11 Pro 23H2 [10.0 Build 22631] (x64)Results for Default test (with this enclosure)------------------------------------------------------------------------------CrystalDiskMark 8.0.5 x64 (C) 2007-2024 hiyohiyo Crystal Dew World: https://crystalmark.info/------------------------------------------------------------------------------* MB/s = 1,000,000 bytes/s [SATA/600 = 600,000,000 bytes/s]* KB = 1000 bytes, KiB = 1024 bytes[Read] SEQ 1MiB (Q= 8, T= 1): 3391.542 MB/s [ 3234.4 IOPS] SEQ 128KiB (Q= 32, T= 1): 3396.686 MB/s [ 25914.7 IOPS] RND 4KiB (Q= 32, T=16): 2216.991 MB/s [ 541257.6 IOPS] RND 4KiB (Q= 1, T= 1): 56.720 MB/s [ 13847.7 IOPS] [Write] SEQ 1MiB (Q= 8, T= 1): 2846.399 MB/s [ 2714.5 IOPS] SEQ 128KiB (Q= 32, T= 1): 2987.766 MB/s [ 22794.8 IOPS] RND 4KiB (Q= 32, T=16): 595.481 MB/s [ 145381.1 IOPS] RND 4KiB (Q= 1, T= 1): 181.819 MB/s [ 44389.4 IOPS] Profile: Default Test: 1 GiB (x5) [A: 12% (6/49GiB)] Mode: [Admin] Time: Measure 5 sec / Interval 5 sec Date: 2024/10/13 19:36:18 OS: Windows 11 Pro 23H2 [10.0 Build 22631] (x64)I am very happy with these results. I purchased this arrangement to allow me to perform IT testing in a Hyper-V environment. I have yet to set it up, however with these test results it should perform very well.Previously I was using a SanDisk 1TB Extreme Pro (2000Mbps Read / 2000Mbps Write).Same test performed on that SSD------------------------------------------------------------------------------CrystalDiskMark 8.0.5 x64 (C) 2007-2024 hiyohiyo Crystal Dew World: https://crystalmark.info/------------------------------------------------------------------------------* MB/s = 1,000,000 bytes/s [SATA/600 = 600,000,000 bytes/s]* KB = 1000 bytes, KiB = 1024 bytes[Read] SEQ 1MiB (Q= 1, T= 1): 849.770 MB/s [ 810.4 IOPS] RND 4KiB (Q= 1, T= 1): 40.854 MB/s [ 9974.1 IOPS] [Write] SEQ 1MiB (Q= 1, T= 1): 919.590 MB/s [ 877.0 IOPS] RND 4KiB (Q= 1, T= 1): 81.240 MB/s [ 19834.0 IOPS] Profile: Real Test: 1 GiB (x5) [E: 41% (380/931GiB)] Mode: [Admin] Time: Measure 5 sec / Interval 5 sec Date: 2024/10/07 23:35:54 OS: Windows 11 Pro 23H2 [10.0 Build 22631] (x64)As you can see the new SSD setup is substantially better!I would highly recommend this enclosure & the Samsung 990 Pro NVMe M.2 SSD combination if you want to utilize the maximum 40Gbps transfer rate (i.e. If your system can support 40Gbps transfer rate, USB4 or Thunderbolt4).