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Quick-start guide

FR:

 Guide de l’utilisateur - fr.startech.com

DE:

 Bedienungsanleitung - de.startech.com

ES:

 Guía del usuario - es.startech.com

NL:

 Gebruiksaanwijzing - nl.startech.com

PT:

 Guia do usuário - pt.startech.com

IT:

 Guida per l’uso - it.startech.com

Manual Revision: 02/16/2017

For the latest information, technical specifications, and support for 

this product, please visit www.StarTech.com/SDMSDRWU3AC.

Package contents

•  1 x card reader/writer

•  2 x end caps

•  1 x quick-start guide

Requirements

•  microSD or SD card

•  Computer, tablet, laptop, or smartphone equipped with a USB-C or 

USB-A port

Note: 

To obtain the maximum USB throughput, you must use a 

system with a USB 3.0 port.

The SDMSDRWU3AC is OS independent and doesn’t require any 

additional drivers or software. 

The card reader/writer receives enough power through the USB bus 

and doesn’t require an additional power source.

Requirements are subject to change. For the latest requirements, 

please visit 

www.StarTech.com/SDMSDRWU3AC

.

SDMSDRWU3AC

USB 3.0 Memory Card Reader/Writer for SD and microSD cards - USB-C and USB-A

*actual product may vary from photos

Introduction

The SDMSDRWU3AC provides a quick and easy way to access 

data stored on SD™ cards and microSD™ cards, and supports data 

transfer speeds up to 5Gbps. You can use this card reader/writer 

with a computer, tablet, laptop, or smartphone that’s enabled with a 

USB-C™ or USB-A port.

Product diagram

Removable end cap

USB-C connector 

(not pictured)

USB-A connector 

(not pictured)

Activity LED

microSD card slot

SD card slot

Removable end cap

About USB 3.0 and USB 3.1 Gen 1

USB 3.0 is also known as USB 3.1 Gen 1. This connectivity standard 

offers speeds up to 5Gbps. Any mention of USB 3.0 in this manual or 

on the StarTech.com website in relation to SDMSDRWU3AC refers to 

the 5Gbps USB 3.1 Gen 1 standard.

Note:

 Data transfer rates are dependent upon the speed of the 

memory card you are using and the speed capabilities of the USB 

port on your device.

About the LED indicator

The SDMSDRWU3AC features a blue 

Activity LED

 located to the 

left of the card slots. The 

Activity LED

 blinks to indicate that data is 

being transferred.

Avoid disconnecting the card reader/writer when the 

Activity LED

 is 

blinking.

Connect the card reader/writer

1.  Gently slide a memory card into the appropriate card slot on the 

SDMSDRWU3AC until you feel resistance and the card is fully 

inserted.

2.  Do one of the following:

•  Insert the 

USB-C connector

 on the card reader/writer into the 

USB-C port on your computer, tablet, laptop, or smartphone.

•  Insert the 

USB-A connector

 on the card reader/writer into the 

USB-A port on your computer, tablet, or laptop.

3.  To access the content on your memory card, follow the 

instructions specific to the operating system that you’re running.

When you connect the card reader/writer, your system automatically 

detects and installs the required software.

Caution!

 Do not insert two cards into the card reader/writer at the 

same time. You can only access the data stored on one card at a time.

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