Express 1M2 40Gb/s Portable NVMe SSD USB4 (Thunderbolt Compatible/USB-C) Ultra Fast External SSD Drive with Aluminum Heat Sink Enclosure (Enclosure Only)

I've been very impressed with the OWC Express 1M2 (40Gb/s). I was able to very easily install my own SSD and extend the storage space for a new Apple Mac mini while saving several hundred dollars. The OWC Express 1M2 along with the SSD now hold my Apple Home folder and everything is external to the Mac mini. I've got a thunderbolt 4 Mac mini. I opted to go with the 40Gb/s OWC Express 1M2 because thunderbolt 5 speeds in the 80Gb/sec version would have no meaningful impact except for "future proofing". The drive and SSD speeds are great. I've never experienced any transfer speed issues. I've only noticed that the drive/SSD get ejected about every 3 weeks. I'm not sure the cause but am in contact with OWC to find a solution. Other than that, it works perfectly. My OWC express 1M2 is connected and on 24x7. It has a solid build and is always cool to the touch. I would recommend turning the light brightness down when installing any SSD. It's not overly bright but I do see the activity light flashing during the night if I'm awake.

I've bought a few different external drive systems over my lifetime, but none as quality on par as this chonky boy. It is thicc, you may notice the same thing, but I'll tell you why it's for good reason. I purchased the 0TB version of the OWC Express 1M2 SSD enclosure and I paired this up with a Samsung 990 Evo Plus. My needs for more hard drive space was quickly realized when the base Mac mini M4's measly 256 GB of storage wasn't gonna cut it. #basemodelgang The premium quality straight out of the box was noticeable in my hands. Heavy. It feels well made and the aluminum reminds me of an expensive tool. It looks cool, I think. Matches the color of my Mac enough. All the fins, slices, across the top of the enclosure allow a massive amount of heat to be dispersed passively. No fans, no noise. And it works well! I have noticed it gets warm to the touch, but nowhere near concerning. It supports PCIe 4.0. It's not the most portable SSD, I will say that is a downside, but it can be for the occasional need. I like that it's thin enough to slide into the front pouch of a backpack. The better part of this setback, is that it allows me to edit videos in Final Cut Pro directly from the drive right as it sits on my desk. Quietly operating, without a sound. It's fast, faster than anything I've used and almost double to internal Mac mini read/write speeds and averages above 3,000 for both. I think this product is for someone who wants to expand their computer with more storage, but doesn't mainly travel with it. If your priority is portability, you may already know this isn't for you. The things that make it not so great option to carry, are the exact reasons you want it when performance and sound are what you are looking for in your search for an external hard drive.

I am using this with a 2021 M1-Max Macbook Pro, paired with the Playstation Drive, the Western Digital Black SN850X 8TB ! IMPORTANT NOTE! I had to return the SN850X with heatsink, as you must get the naked version for use with this drive! Due to true Thunderbolt 4 support, this is the fastest external drive I've ever had with my Mac, sustaining 3 GB/sec read+write! Before this, the best I achieved was 1TB/second using those USB 3.2 drives. And unlike with a lot of ready made external drives, this one was easily formatted and partitioned in Disk Utility, with no special hoops to jump through. It's worth addressing that the size issue is absolutely not bad at all. Yes, this is about twice the size of a compact external SSD, but for true perspective, it is smaller than my iPhone 16 Pro, and because it's a sturdy aluminum case, you can stash it as is in your backpack. I use this drive for very large backups, and during my initial backup of a 3.8TB folder, which took over a half hour due to having over 5 million files, the case definitely got hot. Not serious burn hot, but "I don't really want to hold this in my hand" hot. I do not consider this an issue, as future backups will be deltas, and what you get is pure silence. ( There aren't many high performance 8TB drives on the market, but I trust the SN850 to be reliable, due to its extensive track record with the Playstation 5, and it was the second cheapest 8TB SSD I found ). All in all, I think OWC really knocked it out of the park with this external drive! For a single external SSD, this is a no brainer as the best possible choice! :)

I switched to this enclosure after having issues with a cheaper one from China that kept disconnecting randomly. This one completely solved the problem. I’m using it with a WD Black SN850X on a Mac (M4 Pro), and I’m getting around 3000MB/s+ in real-world speeds. Performance has been stable with no dropouts or disconnects. The design looks clean and premium, and the build quality feels solid and well-made. It does get warm under load, but heat management seems well controlled. Overall, this enclosure did exactly what I needed — fixed my original issue and delivered reliable, fast performance. Very satisfied with the purchase.

I don’t usually leave reviews, but this one absolutely earned it. I’m running a 2024 Mac mini (M4) with a 4TB Crucial P3 PCIe Gen3 NVMe SSD. Previously I had it in a UGREEN 10Gbps enclosure, and it was a constant headache—random disconnects (especially overnight) and inconsistent speeds. I picked this up mainly to fix that issue, not expecting a huge performance jump—but it delivered both. Setup was extremely simple. It comes with a screwdriver, and you just remove two exterior screws to open the enclosure and one internal screw to secure the SSD. Took just a few minutes. Build quality feels solid and the aluminum design helps with heat—warm at most, never hot. I already had my SSD (picked it up on Black Friday), but it’s nice they offer models that include SSDs as well if you need a complete solution. After installing, I ran multiple tests using Blackmagic Disk Speed Test (both 1GB and 5GB stress tests) and saw a huge improvement: • ~2400–4000 MB/s write • ~2800–3000 MB/s read Compared to my previous setup (~900 MB/s write / ~500 MB/s read), this is a massive difference. File transfers are noticeably faster, apps load quicker, and overall responsiveness is much better. Compatibility has been excellent so far on macOS 26.3.1 with zero issues. Most importantly—no disconnects. If you’re on a newer Mac (especially Apple Silicon like the M4) and dealing with slow speeds or unreliable enclosures, this is a serious upgrade. Completely changed my setup. it’s small, sleek aluminum design to help dissipate heat. Nice Mac like design. Comes with cable, screwdriver and extra bottom pads.

It's pro's are well documented, but I'll restate a few from my own experiences: + incredibly efficient cooling. Even under heavy sustained load, my WD Black SN850 stayed under 40c. A lot of people in my world swear by these enclosures because of this. Stable temps = stable performance = happy drive + great compatibility across thunderbolt 3-5, mac/pc, usb fallback, etc. Cons -- It's pretty massive, which is also why it's so great at heat dissipation. For me, it's a little unwieldy for travel compared to my USB-C (10Gbps) M.2 enclosures. I can fit around 4 of those smaller enclosures in the same physical space this thing takes up in my bag. -- I wasn't getting anywhere close to the full write speeds of my drive. I tested on an M4 MacBook Pro Max (TB5) and an XPS 9700 (TB3) and they both capped out around ~1600MB/s in write speed (though reads were a solid 3500MB/s -- Probably not the enclosure's fault, but when testing through various thunderbolt docks/hubs, 2 of the 3 reported it as a USB device and limited it to 10Gbps. The fact that it can fall back to USB is great, but on a thunderbolt port I want it to connect via thunderbolt. -- It uses a pretty ridiculous method for adding / swapping drives. Feels like you're solving a puzzle where others you just pop open. I don't mind screws vs "toolless" (I kind of prefer them), there are just way too many unintuitive steps on this one. If size isn't an issue, and you're not swapping drives often, this is probably the go-to. I think for me, between the size and the minimal speed improvements with my drive vs USB, this isn't going to fit my needs.

Really high quality housing. From OWC I would expect no less. I bought this enclosure to use mostly with my music library, as the hard drive I had been storing my (many) MP3s on was starting to click, and I was afraid it would fail. I purchased this enclosure for a Crucial P310 1TB SSD, PCIe Gen4 NVMe M.2 2280 so my music library could be safe into the future. It works seamlessly with my Macbook Air M3. After playing music for a while, the enclosure does get warm to the touch (as it should - that means it's transferring heat from the SSD to the air) but never hot. The drive responds immediately, unlike the hard drive I was using previously. There is no lag at all with this SSD and enclosure, it responds super fast. My one issue is that it is bus-powered, and my laptop battery drains faster when using this enclosure and SSD. So I just keep an eye on the battery level or I keep my laptop plugged in when using this.

Like a lot of people I was tempted recently by the Mac Mini M4 base model and its value proposition. Of course, only having a 256GB SSD for storage is a problem and Apple charges a ridiculous amount for additional storage so I decided to build an external drive. That's where this OWC 1M2 enclosure comes in. I researched the available enclosures and this one stands head and shoulders, or should I say aluminum fins above the competition. Unlike most others, the 1M2 is a solid block of aluminum with huge heat-dissipating fins that permits your m.2 nvme ssd module to run at full speed without throttling. It certainly does for the 2TB WD Black module I used, which runs warm when busy but does not throttle. Assembly of the 1M2 with your SSD module is easy plus there are lots of tutorials on YouTube. OWC includes a short Thunderbolt 4 cable which works perfectly. Of course you want to connect the 1M2 to one of the Thunderbolt 4 ports on the BACK of the Mac Mini, not the front ports which are much slower. My speed tests speak for themselves: 3200MB/s Write, 3145MB/s Read (Blackmagic benchmark). This is WAY faster than the onboard 256GB SSD and astonishingly good for an external drive. I relocated my user folder to the external disk (again lots of YouTube howtos, I recommend the ones by Mac Sound Solutions). It was easy to do and works extremely well. I am delighted with the 1M2 enclosure and recommend it without reservations. Don't be tempted to skimp and go with a cheap solution. You don't want heat buildup to throttle your disk speeds or worse, shorten the life of your SSD module. Packaging is 100% recyclable which is nice to see.