M.2 SSD Enclosure for M.2 SATA SSDs - USB 3.0 (5Gbps) with UASP

Turn your solid state drive into an ultra-portable pocket drive

Product ID: SM2NGFFMBU33

2.9 stars (20 reviews) |
  • Boost external performance by leveraging the speed of your SATA M.2 SSD in a UASP-supported USB 3.0 enclosure
  • Maximize portability with a small footprint, lightweight design and USB-powered performance
  • Broad compatibility with support for the most common SATA M.2 SSDs (30mm, 42mm, 60mm, 80mm)
Your price

The SM2NGFFMBU33 external USB 3.0 to M.2 (NGFF) enclosure turns your SATA M.2 solid state drive into a portable, high speed USB 3.0 drive.

Get higher external performance by using an M.2 SSD in place of a platter drive, harnessing the full potential of your USB 3.0 computer system. The enclosure supports UASP, enabling you to achieve transfer speeds up to 70% faster than traditional USB 3.0 when used with a UASP-enabled host computer.

This slim, pocket-sized SSD enclosure has been specifically engineered for mobility. The enclosure features a lightweight yet durable design, which fits easily into your pocket or laptop bag. For further convenience, the enclosure is powered entirely using the USB host bus and requires no external power adapter.

Durable aluminum construction helps to ensure your drive won't be damaged while you're on the move. Plus, to maximize heat dissipation the enclosure features specially engineered ventilation holes which help maintain a cooler operating environment for optimal performance and a longer life span for your drive.

maximize heat dissipation with ventilation holes specially engineered to increase air flow

For wide compatibility with all of the common M.2 solid state drives, the enclosure can mount multiple drive heights including: 2242, 2260, and 2280.

The M.2 enclosure is backed by a StarTech.com 2-year warranty and free lifetime technical support.

Improved Performance with UASP

UASP is supported in Windows 8, Mac OSX (10.8 or above), and Linux. In testing UASP performs with a 70% faster read speed and 40% faster write speed over traditional USB 3.0 at peak performance.

UASP Speed Diagram

At the same peak in testing UASP also shows an 80% reduction in required processor resources.

UASP Speed Diagram

Testing results were obtained using an Intel® Ivy Bridge system, a UASP enabled StarTech.com Enclosure, and a SATA III solid state drive.


  • Re-purpose an M.2 SATA SSD as a USB 3.0 external drive
  • Carry with your laptop for a highly portable external storage solution
  • Transfer files to or from your external drive faster, by using a high performance SATA M.2 SSD as your external drive

The StarTech.com Advantage

  • Get the most out of your M.2 SSD with an external USB enclosure that supports UASP, for transfer speeds up to 70% faster than traditional USB 3.0
  • Rest assured your M.2 SSD is supported, with mounting points for the most common M.2 NGFF SSD heights (2230, 2242, 2260, 2280)
  • Carry your USB 3.0 external M.2 SSD in your laptop bag, and maximize portability with a small footprint, lightweight design

Partner Numbers

  • Ingram Chile 2879315
  • UPC 065030859684


  • OS Independent logo
OS independent; No software or drivers required


Warranty Information Warranty 2 Years
Connector(s) 1 - Drive Connectors M.2 (SATA, B-Key, NGFF)
1 - Host Connectors USB 3.0 Micro-B (10 pin, SuperSpeed)
Environmental Operating Temperature 0°C to 50°C (32°F to 122°F)
Storage Temperature -10°C to 85°C (14°F to 185°F)
Humidity 5% to 95% RH
Hardware Interface USB 3.0
Bus Type USB 3.0
Number of Drives 1
Compatible Drive Types M.2 (SATA, B-Key, NGFF)
M.2 (SATA, B+M-Key, NGFF)
Drive Installation Fixed
Chipset ID ASMedia - ASM1153E
Packaging Information Package Height 1.2 in [31 mm]
Package Length 5.2 in [13.1 cm]
Shipping (Package) Weight 4.4 oz [125 g]
Package Width 6.4 in [16.3 cm]
Performance Maximum Data Transfer Rate 5 Gbps
Type and Rate USB 3.0 - 5 Gbit/s
UASP Support Yes
TRIM Support No
4Kn Support Yes
Type and Rate SATA III (6 Gbps)
General Specifications Not compatible with M.2 NVMe or AHCI PCI-Express SSDs
Physical Characteristics Weight of Product 1.8 oz [50 g]
Color Black
Material Aluminum
Product Length 3.9 in [10 cm]
Product Width 1.4 in [35 mm]
Product Height 0.6 in [1.5 cm]
Power Power Source USB-Powered
Software OS Compatibility OS independent; No software or drivers required
Special Notes / Requirements Note Windows 7 and earlier Windows versions do not support TRIM with USB to SATA devices.
What's in the Box 1 - Included in Package USB 3.0 to M.2 NGFF SSD Enclosure
USB 3.0 Cable
SSD screw kit
Mini screw driver
Instruction manual



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Product Support

Talk to an Advisor

We are always ready to assist you with any questions you may have.

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Frequently Asked Questions


When you troubleshoot issues with a hard drive enclosure, there are some quick tests that you can complete to rule out potential problems. You can test to make sure that the following components are working correctly and are not the source of the issue:

  • Cables
  • Hard drives
  • Hard drive enclosure

To test your setup components, try the following:

  • Use the cables, hard drives, and hard drive enclosure in another setup to see if the problem is with the components or the setup.
  • Use a different cable, hard drive, and hard drive enclosure in your setup to see if the problem persists. Ideally, you should test a component that you know works in another setup.

When you test the hard drive and hard drive enclosure, it is recommended that you do the following:

  • To check Disk Management, press the Windows key + R, type diskmgmt.msc, and press Enter. Check to see if your hard drive is listed.
  • If the hard drive is listed with unallocated space, the hard drive needs to be reformatted. Right-click unallocated and click New Simple Volume. Follow the on-screen instructions to complete the reformatting.​

Note: Formatting a hard drive erases all of the data on it. Make sure that you back up all of your data before you reformat the hard drive.​

  • If the hard drive is listed as healthy but does not have a drive letter, for example, C:, right-click healthy and click Change Drive Letter and Paths. Click Add, assign a drive letter, and click OK.

Note: A formatted hard drive will not show up in Computer or My Computer until it has a drive letter assigned to it.

Before You Buy

Although M.2 SSDs come in similar form factors, only an M.2 SATA drive with an NGFF B key will operate with this device. M.2 drives that are PCIe or have a different key position are not compatible with this device.

This device can adapt an M.2 SATA drive to standard SATA connections, which is not possible for a PCIe based M.2 drive. The key type refers to the connector type on the M.2 SATA drive. B key can be M.2 PCIe x2 or SATA, so it is important that you check the specifications of the drive to see if it supports SATA.

To determine if your hard drive will work in this enclosure, on the product page, click the Technical Specifications tab, and do the following:

  • Make sure that the enclosure supports the storage size of your hard drive. If the storage size of your hard drive is larger than what the enclosure was tested with, the hard drive will likely still work with the enclosure.
  • Confirm that your hard drive uses the same interface type as the enclosure. For example, IDE, SATA, or M.2.
  • Make sure that the enclosure supports the physical size of your hard drive, such as 2.5 inches or 3.5 inches.
  • Make sure that the enclosure supports the height of your hard drive. For example, 9 mm or 15 mm.
  • Verify that the power consumption of your hard drive doesn’t exceed the power output of the enclosure. If you’re using multiple hard drives, make sure that the combined power consumption of all of the hard drives doesn’t exceed the power output of the enclosure.

Hard Drives

Windows 10 

Before you can access a new or formatted drive in your operating system, you need to initialize it first and then create a partition on the drive. A partition defines an area of the drive to use for storing data. The partition uses a file system (for example, ex-FAT, NTFS, and so on).

Initialize a drive

Note: You typically only need to initialize a drive if the drive is new. If you cannot find an uninitialized drive in Disk Management, skip the following steps and try to partition your device.

  1. Press the Windows key + R, type compmgmt.msc, and click Run to open Computer Management.

  2. Navigate to Disk Management.

  3. When prompted to, initialize your disk(s). If you are running Windows® 7 or later and are using a drive larger than 2TB, initialize the disk(s) with GPT. If you are running an earlier version of Windows, initialize the disk(s) with MBR. For more information, visit the following FAQ: https://www.startech.com/support/faqs/technical-support?topic=hard-drives#mbr-vs-gpt.

  4. Click OK.

Create a partition in a drive

Note: The following steps create an NTFS partition that uses the entire drive space. To use a different file system, select a different option in step 6.

  1. Right-click Unallocated or RAW volume, and select New Simple Volume.

  2. In the New Partition Wizard, click Next.

  3. Select Primary partition.

  4. Leave the partition size set to default, and click Next.

  5. Assign a drive letter or leave it set to the default, and click Next.

  6. Enter the following settings to format the partition:

  • In the File System field, enter NTFS.
  • Set the Allocation unit size to Default.
  • In the Volume label field, enter <your name/reference>.
  • Select the Perform a quick format check box.
  • Clear the Enable file and folder compression check box.
  1. Click Next > Finish.

The new drive should appear in Windows Explorer.

Mac OS

Before you can access a new or formatted drive in your operating system, you need to initialize it first and then create a partition on the drive. A partition defines an area of the drive to use for storing data. The partition uses a file system (for example, HFS+, ex-FAT, NTFS, and so on).

Initialize a drive

Mac OSX detects a drive that needs to be initialized and automatically prompts you to initialize the drive. If you are prompted to initialize the drive, click Initialize. If you are not prompted to initialize the drive and you cannot find the drive in Finder, you will need to create a partition on the drive.

Create a partition on a drive

Note: The following steps create an HFS+ (Mac OS Extended (Journaled)) partition that uses the entire drive space.

To create a partition on a new drive, complete the following:

  1. Open Finder.

  2. Navigate to Applications and click Utilities.

  3. Open Disk Utility.

  4. Select the new drive and click the Partition tab.

  5. Click Options and verify that it is set to GUID Partition Table.

  6. Enter a name for the partition.

  7. Click Partition.

The drive should now be accessible in Finder.

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Compliance and safety

Compliance letters

Safety Measures

  • If product has an exposed circuit board, do not touch the product under power.
  • If Class 1 Laser Product. Laser radiation is present when the system is open.
  • Wiring terminations should not be made with the product and/or electric lines under power.
  • Product installation and/or mounting should be completed by a certified professional as per the local safety and building code guidelines.
  • Cables (including power and charging cables) should be placed and routed to avoid creating electric, tripping or safety hazards.
*Product appearance and specifications are subject to change without notice.

Customer Reviews

(20 reviews)
2.9 out of 5 stars
  • 5 (2)
  • 4 (4)
  • 3 (8)
  • 2 (2)
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1 - 20 of 20 Reviews
(3 Stars)


By: hydrox2000 - 09/07/2016
Found this on newegg. I do like, however I did not receive the screwdriver or the screws that close the front plate. I did to take one screw from the back to close the front plate.
| Helpful?
Barry, Customer Support on 9/8/2016 9:16:04 AM
Hello, We're glad you're enjoying the enclosure, but sorry to hear about the missing parts from the package. One of our Technical Advisors should be contacting you via email shortly to arrange getting the missing parts over to you. If you need anything else in the meantime, you can speak with one of our advisors by clicking "Support" at the top of our website. Thank You,
(3 Stars)

Works well, but cheaply constructed.

By: Willdabeest - 10/21/2016
I needed to migrate the data from a dead laptop and picked one of these up yesterday. Mounting the M.2 drive to the board is ridiculous, as the screw/nuts included are too tiny to be handled easily and don't feel solidly connected. The back panel on mine is misaligned (badly drilled holes), as only 1 screw can be used, the other is off-centered.
| Helpful?
(2 Stars)


By: jerome - 12/01/2016
I bought this 2 days ago, received it today. Product looks flimsy. The only thing i wasn't impressed was the front enclose cap/lid is missing ! I am not sure if i want to keep it or send it back. Since the SSD slides out without the front plate :( .
| Helpful?
Barry, Customer Support on 12/6/2016 10:41:01 AM
Hello, Thanks for taking the time to share your experience with our M.2 SSD enclosure. We're very sorry to hear that you received a package with missing parts. We have passed your email address over to our Technical Advisory Team. They will be in touch with you soon to coordinate sending a replacement enclosure to you right away. We're very sorry for the inconvenience this has caused and hope to resolve it quickly. Thank you
(4 Stars)

Rugged SSD storage enclosure that goes anywhere!

By: Tazbier3 - 12/30/2016
The build quality and the compact size on the SSD ultra portable external drive were the first thing I noticed straight out of the box. Also given all the tools needed including the mini screwdriver was a plus so I could install the drive quickly. Most drives I have seen are in a plastic housing and the housing will make sure to protect and add longevity to the drive to be used over and over again.
| Helpful?
(4 Stars)

Great product - Sturdy and Portable

By: ABThompsons - 01/24/2017
This product includes the USB 3.0 to M.2 NGFF SSD enclosure, a USB 3.0 cable, the SSD screw kit and Mini screw driver. The assembly was relatively quick, but a little difficult due to the tiny screw sizes. The enclosure is able accept different drive lengths by moving the drive mounting stand. The enclosure is aluminum and light weight, perfect for throwing into your laptop bag. Its sturdy construction ensures that the contained drive will not get damaged. It also has ventilation holes on both sides to prevent overheating. This enclosure is perfect for turning your M.2 SSD into a portable unit. I received this product in exchange for an unbiased review.
| Helpful?
(3 Stars)

Not compatible with Samsung 960 M.2 EVO

By: CNGM - 05/12/2017
Disappointed. The Samsung Evo 960 M.2 EVO is just slightly too large to fit the connector.
| Helpful?
Barry, Customer Support on 5/15/2017 11:46:01 AM
Hello, The Samsung Evo 960 M.2 SSD is based on PCIe technology. Unfortunately, the SM2NGFFBU33 enclosure is only compatible with SATA based M.2 drives, in multiple drive heights including 2242, 2260, and 2280.
(3 Stars)

Not recognised by Samsung Data Migration Software

By: sam07 - 05/22/2017
I bought this to use the spare M.2 SSD from an upgrade. It works as an external drive via the Microsoft UAS mass storage driver. The drive is listed as ASMT 2115 and can be formated. However, the Samsung SSD EVO 850 256GB cannot be recognised by Samsung Data Migration. There does not seem to be a way around this so a little dissapointing :(
| Helpful?
(4 Stars)

SSD Drive does not fit in the enclosure

By: IT Dude - 06/08/2017
I've purchased a couple of these when they came out as our IT dept was rolling out SSD drives in our organization. I have had no issues with those two, therefore the rating. HOWEVER, when I received this one last week, I noticed the SSD drive would not slide in as easy as it would on the others. After closer examination, I see that there are 5 contacts on the left when inserting the SSD drive into the enclosure and it doesn't seem to fit in. If I look at the others I purchased, I see 4 contacts on the left with a space in between them. The part numbers and all other HW info is the same on this one vs the others. Is this a defect? Should I purchase another to see if it mirrors the ones I already have and work? Thank you.
| Helpful?
By: schnarbler - 12/05/2017
You have purchased a different unit, there is another unit that looks identical but it is for use with the PCIe version of the M.2 drive.
| Helpful?
(1 Stars)

M2 doesn't fit into the port

By: brandonhro - 07/08/2017
My M2 ssd from the dell xps 13 doesn't even fit into the enclosure port. This is absolutely ridiculous. Very disappointed with the build quality of this product
| Helpful?
Nick, Customer Support on 7/14/2017 1:57:41 PM
Hi, Thanks for sharing your review of our SM2NGFFMBU33. We apologize for the issue you've experienced, and we want to help. The Dell XPS 13 uses a PCIe-based NVME M.2 drive. The SM2NGFFMBU33 will only fit and work with SATA-based AHCI M.2 drives, which is the reason your drive would not fit into the enclosure. We apologize for any inconvenience this may cause. We hope this has helped. If you have any further questions or concerns please do not hesitate to contact us! Thank you,
(1 Stars)

Screws don't even fit

By: jackmerde - 07/21/2017
I bought this a couple days ago, and I tried to connect my WD ssd but they screw wasn't long to hold the ssd down. I can connect the ssd to the port, but that's all I can do. Completely unsatisfied with this product, if you have an m.2 ssd with 2280 standard model then this product will not fit for you.
| Helpful?
Brian, Customer Support on 8/4/2017 12:28:26 PM
Hi, Thanks for your feedback. We are very sorry for the trouble and would like to help. SATA 2280 m.2 drives can be used it may just require moving the mounting screw and standoff back to the furthest mounting point. We would be happy to help guide you through the process, please reach out to us by chat, phone or email using our support site: https://www.startech.com/support If the wrong screw was provided, we sincerely apologize and can replace that for you. Thank you.
(1 Stars)

Not fit for my Samsung 960 EVO MZ M.2 2280

By: TonyP - 07/23/2018
I need such like this and so happy to order this but connector not fit my Samsung 960 EVO MZ M.2 2280 A little small.
| Helpful?
Sam, Customer Support on 7/24/2018 4:31:37 PM
Thank you for your feedback on SM2NGFFMBU33. We're sorry it didn't work with your M.2 SSD! This enclosure is compatible with SATA-based, B-Key M.2 SSDs, and it appears that the Samsung 960 Evo M.2 SSD is a PCIe-based, M-key M.2 drive. Unfortunately, these are not compatible with one another.
(5 Stars)

Works great with Lenovo M.2 drive

By: BetterCallKaul - 08/23/2018
No issues whatsoever when using it with my M.2 SSD drive from my Lenovo X1 Yoga. Works better than expected!
| Helpful?
(3 Stars)

TRIM support

By: NS123 - 11/12/2018
Supported TRIM perfectly BUT only after a search for the correct ASM 1153E firmware file - 140509_A1_82_40.bin then update with a third party MPtool application. This was done at my own risk - I do not recommend other users do this as they may render the unit non-functional. Perhaps I had an unit with older firmware. Suggestion - maybe provide the ASM1153E firmware which supports TRIM directly on the startech website rather than have to search at least an hour to fix it. TRIM is important for optimal SSD function. Build quality etc is good but only 3 star for this reason.
| Helpful?
(2 Stars)

parts missing

By: trillal - 12/06/2018
Not all parts were in package, i am missing the end plate so i can't really use it since the whole drive just slips out of the "enclosure".
| Helpful?
Sam, Customer Support on 12/26/2018 2:18:09 PM
Thank you for your feedback on SM2NGFFMBU33. We're sorry that it didn't come with all of its components. We recommend reaching out to our Technical Advisors at 1-800-265-1844 or www.startech.com/chat so we can mail you any missing parts. We're available 24 hours a day, 5 days a week, to provide support.
(3 Stars)

Good product, poor instructions and missing parts

By: macphoto1970_012 - 01/12/2019
This is a good quality enclosure as far as function and overall build. The instructions are poor and what should be a mindless install had me stumped for a bit. The instructions talk of a standoff installed...Mine was in the bag and I thought it was to screw the m.2 down. I was missing the screws for the end of the enclosure as none were provided. This should be a fast install but wow for some reason I had to read and figure this out. Then I looked at other reviews and found out that this is common. The screw is too short....no its the right length you need to screw down the stand off with the nut and then the other screw ...screws in the standoff. The enclosure works well but I still found it frustrating that what should take zero instructions took me time to figure out...and the poor instructions made thing even more difficult to understand. On top of that missing screws ...well thats an incomplete product. Good and bad with this but function is what really matters and for that it is ok I reviewed this product in exchange for an unbiased review.
| Helpful?
(3 Stars)

Not detecting SSD

By: Winston - 01/14/2019
Hi, i have the SM2NGFFMBU33 i added a crucial P1 M.2 2280, after connecting the unit to the computer, it fails to recognize the SSD -. Windows can see the Disk 2 Removable but states no Media. the SSD is connected and if i put it in a laptop it works fine. advice? Thanks
| Helpful?
Brian, Customer Support on 1/15/2019 11:02:28 PM
Hi Winston, Unfortunately this product will not work with your Crucial SSD because that drive uses a PCI-express interface. Our enclosure only works with SATA, m.2 drives. If your computer has a Thunderbolt 3 interface, you may use our BNDTB4M2E1 to access your drive. While it is more costly, it will also out-perform a USB 3.0 enclosure by a wide margin. We have also emailed you directly with this information.
(5 Stars)

Better than a flash drive!

By: Andrew11 - 01/30/2019
I wanted one of these to work with a WD green M.2 drive I picked up on special to see if i could 'make' a large capacity USB drive. This worked better than I expected. Not only did I get a large capacity drive in a portable enclosure, the cable means a large USB stick isn't sitting in my USB port daring me to bump it and ruin the port. Transfer speeds are very good with large files and the enclosure is very good at dissipating heat. Overall I am very impressed!
| Helpful?
(1 Stars)

Doesn't work

By: br13 - 06/26/2020
My SSD boots, but when I try to look at the content with this adapter, my computer calls the adapter a removable disk adapter with no disk.
| Helpful?
Stacey, Customer Support on 7/21/2020 11:39:32 AM
Thank you for taking the time to leave your feedback. I’m sorry to hear of the difficulties you are experiencing. We’re reaching out directly to see if we can assist. Did you know we offer free lifetime support with all our products? You can reach out to our Technical Advisors via phone or chat 24 hours a day, 5 days a week for assistance.
(3 Stars)

Missing parts

By: taraL - 04/21/2021
Opened up box and missing the SSD mounting screw and standoff as well as the end plate. Very disappointing as it is not functional with missing parts :(
| Helpful?
Dan, Customer Support on 4/21/2021 9:16:57 AM
We apologize about the inconvenience this caused. We will reach out to see if we can offer some assistance.
(4 Stars)

Decent Enclosure

By: Darren - 04/24/2021
I bought this enclosure (SM2NGFFMBU33) two months ago to transfer files from a PC with a dead motherboard. The enclosure worked fine and did exactly what I needed. I did check and double-check the M.2 SSD connector BEFORE I ordered it to make sure it would fit properly. My SSD was pulled from an older PC and I did see enclosures on the market where it would not fit the connector. Apparently all M.2 connectors are not the same or have changed slightly over time despite an assumed standard. Pros: Aluminum construction for durability, good build quality - solid and everything fits together the way it was designed, no external power required, all parts were included in my kit, file transfer speeds were fast Cons: the screws are tiny and really hard to work with, the SSD mounting screw causes a slight bend in the SSD board, and the SSD mounting screw comes loose and requires retightening periodically Subject to the cons described above I would both recommend this product and purchase it again.
| Helpful?
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