StarTech SM21BMU31C3 M.2 SSD Enclosure for M.2 SATA SSDs

Original price was: $54.99.Current price is: $43.99.

  • Leverage your SATA M.2 SSD to add fast external storage to your USB-C enabled host (USB-C cable included)
  • Supports USB 3.1 Gen 2 (10Gbps)
  • Compatible with Thunderbolt 3 USB-C port
  • Solid aluminum housing with ventilation for optimum heat dissipation
  • Broad compatibility with support for the most common M.2 SATA SSDs (30mm, 42mm, 60mm, 80mm)
  • Not compatible with M.2 NVMe or AHCI PCI-Express SSDs
  • Supports SATA I/II/III (1.5, 3, 6Gbps)

2 in stock

StarTech SM21BMU31C3 M.2 SSD Enclosure product image
StarTech SM21BMU31C3 M.2 SSD Enclosure for M.2 SATA SSDs $54.99 Original price was: $54.99.$43.99Current price is: $43.99.

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MFG #: SM21BMU31C3
SKU: 02010503

StarTech SM21BMU31C3 M.2 SSD Enclosure for M.2 SATA SSDs

Turn your M.2 SATA drive into an ultra-fast, ultra-portable storage solution for USB-C enabled devices

This StarTech compact M.2 SATA SSD enclosure lets you add highly portable data storage to any laptop or computer with a USB-C™ port – such as MacBook, Chromebook Pixel™, Dell™ XPS laptops, and many others. It turns your SATA M.2 drive into a high-speed storage solution over a USB 3.1 Gen 2 connection, at up to 10Gbps throughput.


This slim, pocket-sized enclosure for M.2 NGFF SATA SSDs has been specially designed for mobility, with a small form factor design that fits easily into your laptop bag. Its lightweight yet durable aluminum housing helps to ensure your drive won’t be damaged while you’re on the move.

Ventilation holes help to dissipate heat and help ensure an optimum operating temperature.

An image and graphic showing the StarTech M.2 SSD Enclosure with red and blue arrows at the ventilation holes, to illustrate heat dissipation.


Leverage the speed of your M.2 NGFF SATA drive with this external enclosure. It delivers USB 3.1 Gen 2 data transfer speeds up to 10Gbps as well as UASP support, so you can achieve higher transfer speeds when you connect it to a UASP-enabled host computer.

The enclosure works with tablets, laptops and desktop computers and is compatible with hosts equipped with Thunderbolt 3 USB-C ports.


The enclosure is compatible with all of the common M.2 SATA SSDs, and enables you to mount multiple drive lengths, including: 30mm (2230), 42mm (2242), 60mm (2260), and 80mm (2280).

The SM21BMU31C3 is backed by a 2-year warranty and free lifetime technical support.


  • Mobile professionals can use their M.2 SATA SSD to gain high-speed data access for their USB-C enabled laptop or computer
  • Repurpose an M.2 SATA SSD as a USB 3.1 Gen 2 external drive
  • Transfer files faster by using a high-performance SATA M.2 SSD as your external drive



MFG #: SM21BMU31C3

Warranty: 2 Years
Drive Connectors: 1 – M.2 (SATA, B-Key, NGFF)
Host Connectors: 1 – USB 3.2 USB Type Micro-B (10 pin, Gen 2, 10 Gbps)
Operating Temperature: 0°C to 40°C (32°F to 104°F)
Storage Temperature: -10°C to 65°C (14°F to 149°F)
Humidity: Operation Humidity: 10% ~ 90% RH / Storage Humidity: 5% ~ 95% RH
Interface: USB 3.2 Gen 2
Bus Type: USB 3.2 Gen 2
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; Realtek – RTS9201VB
LED Indicators: 1 – Power & Activity
Package Height: 1.3 in [3.4 cm]
Package Length: 6.2 in [15.8 cm]
Shipping (Package) Weight: 4.9 oz [140.0 g]
Package Width: 5.1 in [13.0 cm]
Package Quantity: 1
Maximum Data Transfer Rate: 10 Gbps
Type and Rate: USB 3.2 Gen 2 – 10 Gbit/s
UASP Support: Yes
4Kn Support: Yes
Type and Rate: SATA III (6 Gbps)
TRIM Support: Yes
MTBF: 1,000,000 hours
General Specifications: Not compatible with M.2 NVMe or AHCI PCI-Express SSDs
Weight of Product: 2.2 oz [61 g]
Color: Black & Silver
Material: Aluminum
Max Drive Height: 3.1 in [80 mm]
Product Length: 3.9 in [99 mm]
Product Width: 1.7 in [4.2 cm]
Product Height: 0.5 in [1.3 cm]
Power Source: USB-Powered
Input Voltage: 5V DC
Output Voltage: 5 DC
OS Compatibility: OS independent; No software or drivers required
Note: Windows 7 and earlier Windows versions do not support TRIM with USB to SATA devices.

What's Included

(1) M.2 NGFF SATA Enclosure – USB 3.1
(1) USB-C to Micro B cable – 18.5 inches
(1) M.2 screw kit
(1) Screwdriver
(1) Quick install guide


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