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All-in-1 USB 3.0 Card Reader/Writer with Dual SD Slots

Blazing fast file transfers

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USB 3.0 Super Speed

  • Super Speed transfer rates up to 5 Gbps
  • Backwards compatible with USB 2.0 and 1.1 ports
  • Surpasses USB 2.0 read speed limitations allowing latest high speed memory cards full read speeds

Get the speed you need

  • Transfer large amounts of data up to 10 times faster than USB 2.0
  • Each slot detects native speed and transfers data at the maximum rate for each card
  • Dual SD, MMC and Memory Stick slots allow two cards of the same type to be accessed simultaneously

Easy Install

  • Plug & Play
  • Hot Swappable
  • No driver installation required for Windows, Macintosh, or Linux
  • USB Cable can easily be removed for easy storage or portability

Visual Indicators

  • Power and status LEDs

Excellent Card Compatibility*

  • Supports CompactFlash® I, SD™ Series, SDHC Series, SDXC Series, T-Flash, MultiMediaCard™, MMCplus™, MMCmobile™, RS-MMC™, RS-MMC Dual Voltage, MMCmicro™, Memory Stick®, Memory Stick Duo™, Memory Stick Micro™, Memory Stick PRO™ Series, Memory Stick XC™ Series, SmartMedia™, Microdrive™
  • Support for CF cards with PIO and UDMA including modes 6 and 7
  • Support for SD cards with UHS


Specifications & Standards


  • Compliant with Universal Serial Bus 3.0 Specification Revision 1.0

Supported Memory Cards

  • Slot 1 (SD/MMC/MS): Secure Digital Card (SD), SDHC, SDXC, miniSD*, miniSDHC*, microSD*/T-Flash*, microSDHC*, MultiMedia Card (MMC), MMCplus, MMCmobile, RS-MMC*, MMCmicro*, Memory Stick (MS), MS PRO, MSXC, MS micro*, MS XC*
  • Slot 2 (CF): CompactFlash I, Microdrive (MD)
  • Slot 3 (SM): SmartMedia (SM)
  • Slot 4 (SD/MMC): Secure Digital Card (SD), SDHC, SDXC, miniSD*, miniSDHC*, microSD*/T-Flash*, microSDHC*, MultiMediaCard (MMC), MMCplus, MMCmobile, RS-MMC*, MMCmicro*
  • Slot 5 (MS/Duo): Memory Stick (MS), MS PRO, MSXC, MS DUO, MS PRO DUO, MS XC DUO, MS PRO-HG Duo, MS PRO-HG Duo, MS XC DUO, MS XC-HG Duo, MS micro*, MS XC*

Transfer Rate

  • USB 3.0 - up to 4.8 Gbps
  • USB 2.0 - up to 480 Mbps
  • USB 1.1 - up to 12 Mbps


  • Temperature: Operating Temperature conditions: 0 to 40 degrees C, Non-Operating Temperature conditions: -10 to 85 degrees C
  • Humidity: Operating Humidity conditions: 20% to 80% non-condensing, Non-Operating Humidity conditions: 5% to 95% non-condensing


  • FCC approved (Part 15 Class B)
  • CE approved (Class B)

Package Dimensions/Weight

  • 8.5 x 6.25 x 2 in.
  • .35 lb

Product Dimensions

  • 3.15 x 3.15 x 0.7 in.
  • .16 lb

Minimum System Requirements

  • System with available USB port
  • USB 3.0 port required for Super Speed transfer rates

Operating Systems

  • Card Reader is operating system independent

Package Contents

  • USRobotics All-in-One USB 3.0 Card Reader
  • USB 3.0 cable (12 in)
  • User Guide

Product Number

  • USR8420

Warranty Information

One-year limited manufacturer warranty from date of purchase. Click here for full warranty information.

Support & Documentation

Support Page

Thumbnail Title Size Type
Installation Guide 1,984.17 KBPDF
Data Sheet 1,101.25 KBPDF


What's in the box?

* Adapters are needed for mini and micro cards.
† USB 3.0 super speeds are achieved when used with USB 3.0 compatible devices and cables. Actual speeds may vary based on card and host system.