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Quick-Start Guide

To view manuals, FAQs, videos, drivers, downloads, technical drawings, and more, visit www.startech.com/support.

Manual Revision: May 15, 2019 2:18 PM

Product Diagram (SM21BMU31CI3)

Exterior

Component

Function 

1

Drive-Tray Screws x 2

•  Used to secure the Drive Tray in the 

Enclosure.

2

USB-C Cable

•  Used to connect the Enclosure to the Host 

Computer.

Interior

Component

Function 

1

M.2 NGFF B Key Drive 

Connector

•  Used to connect the Drive to the Enclosure.

2

Drive Length Holes 

(x 2)

•  Used to accommodate different drive lengths 

(42 mm, 60 mm and 80 mm).

3

Drive-Mount Screw/

Nut

•  Used to secure the Drive to the Enclosure.

M.2 NGFF SATA Enclosure | USB-C | USB 3.1 (10Gbps)

1

4

Standoff (not 

displayed)

•  Used to secure the Drive to the Enclosure 

using either the 42 mm or 60 mm Drive 

Length Holes

Requirements

For the latest requirements,  please visit 

www.startech.com/SM21BMU31CI3

• An available USB-C Port
• An M.2 NGFF SATA SSD

Installation

Installing a Drive

Warning! 

Drives should be handled carefully, especially when they’re transported. If 

you’re not careful with your drives, you may lose data as a result.

1.  Use a Phillips Head Screwdriver (included) to remove the Drive-Tray Screws (x 2) 

from the Enclosure

2.  Carefully pull the Drive Tray out of the Enclosure.
3.  Place the Drive beside the Drive Tray and align the screw groove on the Drive with 

the Adjustable Drive Length Holes on the Drive Tray.

4.  Use a Phillips Head Screwdriver to remove the Drive-Mount Screw.

Note: 

If the drive-mount hardware is already installed in the correct position, proceed 

to step 9.

5.  Align the Standoff with the correct Drive Length Hole according to the length of 

the Drive.

6.  Insert the Standoff into the large part of the Drive Length Hole.

Note: 

Make sure that the longer part of the standoff is on the same side as the 

M.2 

NGFF B Key Drive Connector

.

7.  Align the notches on the Standoff with the edges of the smaller part of the Drive 

Length Hole.

8.  Slide the Standoff into the smaller part of the Drive Length Hole.
9.  Gently slide the connector on the Drive (on a 30-degree angle) into the M.2 NGFF B 

Key Drive Connector on the Enclosure.

Note: 

Do not force the Drive into the enclosure, the connector on your drive is keyed so 

that it only fits one way.

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