What type of drives is this enclosure compatible with?

This enclosure is compatible with M.2 SATA SSDs that have B-Key or B+M Key connectors and support drive sizes of 2242, 2260, and 2280.

What is the maximum data transfer rate this enclosure can handle?

The maximum data transfer rate this enclosure can handle is 6 Gbps.

Is there any specific operating system required for this enclosure to work?

The enclosure is OS independent and does not require any specific operating system.

Does the enclosure come with necessary tools for assembly?

Yes, the enclosure comes with necessary tools for assembly.

I understand that this device is for SATA M.2 SSDs, but just wondering if there is any advantage in getting an NVMe M.2 SSD drive & enclosure instead? That is, in consideration of the speed limitations of USB technology, is an NVMe SSD via USB is any faster than an SATA M.2 via USB?

The device is not compatible with M.2 NVMe or AHCI PCI-Express SSDs. Given that USB 3.1 Gen 2 has a maximum data transfer rate of 10 Gbit/s, an NVMe SSD would not be able to fully utilize its higher speed capabilities with this USB interface. Therefore, in the context of this device, there would be no speed advantage in using an NVMe M.2 SSD over a SATA M.2 SSD.

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StarTech.com SM21BMU31CI3 M.2 SSD Enclosure for M.2 SATA Drives - USB 3.1 Gen 2 - USB-C - Portable M.2 External Enclosure (SM21BMU31CI3)

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Turn your M.2 NGFF SATA drive into high performance external storage for your USB Type-C laptop or tablet or desktop computer
USB-C M.2 SSD enclosure for M.2 SATA drives
Portable M.2 SATA to USB adapter provides fast connection to your M.2 SATA SSD over USB 3.1 Gen 2
USBC M.2 enclosure with attached USB C cable
Compact aluminum SATA M.2 hard drive enclosure (4x2x1.5 inch / 11x5x1.4 cm) with ventilation
SATA M.2 external enclosure works with M.2 SATA SSDs (2242 / 2260 / 2280)

Overview

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Model
Brand	StarTech.com
Model	SM21BMU31CI3

Details
Color	Black
Size	M.2
Type	Enclosure
AC Adapter	No
Material	Aluminum
Internal Interface	M.2 NGFF B-Key
External Interface	USB 3.1 Gen 2 Type-C
Number of Bay	1
Power	USB-Powered
Specifications	Chipset ID: JMicron - JMS580 Drive Size: 22mm - M.2 SATA Supported Drive Height(s): 2242 / 2260 / 2280 Compatible Drive Types: M.2 (SATA, B-Key, NGFF) / M.2 SATA (NGFF, B+M-Key) Maximum Data Transfer Rate: 6 Gbps MTBF: 50,000 hours TRIM Support:Yes Type and Rate: USB 3.1 Gen 2 - 10 Gbit/s, SATA III (6 Gbps) UASP Support: Yes Drive Connectors: 1 - M.2 (SATA, B-Key, NGFF) Receptacle Host Connectors: 1 - USB Type-C (24 pin) USB 3.1 (10Gbps) Male Note: Not compatible with M.2 NVMe or AHCI PCI-Express SSDs Windows 7 and earlier Windows versions do not support TRIM with USB to SATA devices.

Compatibility
Operating Systems Supported	OS independent; No software or drivers required

Features
Features	Turn your SATA M.2 SSD into external storage for your USB-C laptop, tablet or desktop computer Ultra-fast USB 3.1 Gen 2 data connection for M.2 SATA drives Compact solid aluminum design (4x2x1.5 inch / 11x5x1.4 cm) with ventilation and attached braided cable Broad compatibility with the most common M.2 SATA SSDs (B Key / B+M Key) in various lengths (42, 60, 80 mm) Not compatible with M.2 NVMe or AHCI PCI Express SSDs

Dimensions & Weight
Dimensions	0.60" x 4.30" x 2.00"
Weight	3.4 oz.

Package Contents
Package Contents	1 x M.2 SATA Enclosure with Integrated USB-C Cable 1 x Screwdriver 4 x Assembly Screws 1 x Set of Drive-Mounting Hardware 1 x Quick-Start Guide

Additional Information
First Listed on Newegg	September 17, 2025

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StarTech.com SM21BMU31CI3 M.2 SSD Enclosure for M.2 SATA Drives - USB 3.1 Gen 2 - USB-C - Portable M.2 External Enclosure (SM21BMU31CI3)

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StarTech.com SM21BMU31CI3 M.2 SSD Enclosure for M.2 SATA Drives - USB 3.1 Gen 2 - USB-C - Portable M.2 External Enclosure (SM21BMU31CI3)

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Customer Reviews of the STARTECH SM21BMU31CI3

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