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SanDisk SDDR-B531-GN6NN MobileMate microSD Card Reader - USB 3.0 — main product image
SanDisk SDDR-B531-GN6NN MobileMate microSD Card Reader - USB 3.0
SanDisk SDDR-B531-GN6NN MobileMate microSD Card Reader - USB 3.0
SanDisk SDDR-B531-GN6NN MobileMate microSD Card Reader - USB 3.0
SanDisk

SanDisk SDDR-B531-GN6NN MobileMate microSD Card Reader - USB 3.0

★★★★★4.5 (31145 reviews)
USB 3.0USB 2.0

Compact USB 3.0 microSD reader delivering transfer speeds up to 170MB/s in a pocket-friendly design.

$17.99*
✓ In Stock on Amazon.com
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*Price sourced from Amazon.com. Last updated:Jun 08, 2026.Price and availability are subject to change.

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Overview

The SanDisk MobileMate USB 3.0 microSD Card Reader (SDDR-B531-GN6NN) is designed for users who frequently move files between microSD cards and computers. With USB 3.0 transfer speeds up to 170MB/s, it handles large photo libraries, video files, and data backups with minimal wait time. The reader is backward compatible with USB 2.0 ports, ensuring it works with virtually any computer you encounter, albeit at reduced speeds.

Measuring just 30.48mm x 20.701mm x 8.763mm, the MobileMate is one of the most compact card readers available, making it an easy addition to any gear bag or pocket. Its plug-and-play operation means no software installation is required — simply insert a microSD card, plug the reader into a USB port, and begin transferring. While it is limited to microSD format and UHS-I speeds, for users whose workflow centers on microSD media, it provides a fast, durable, and highly portable solution from a trusted name in flash storage.

Key Features

Compact and durable microSD card reader

Fast UHS-I transfer speeds of up to 170 MB/s*

With USB 3.0, move content up to 10x faster than USB 2.0 readers(2)

Compatible with USB 3.0 and backwards-compatible with USB 2.0

Two-year limited manufacturer warranty(1)

Dimensions (L x W x H) - 30.48mm x 20.701mm x 8.763mm

Specifications

Brand
SanDisk
Model
SDDR-B531-GN6NN
Interface
USB 3.0 (backward compatible with USB 2.0)
Transfer Speed
Up to 170MB/s
Card Compatibility
microSD, UHS-I
Dimensions
30.48mm x 20.701mm x 8.763mm

Pros & Cons

👍 Pros

  • Transfer speeds up to 170MB/s over USB 3.0 make offloading large files quick
  • Extremely compact dimensions (roughly 30mm x 21mm x 9mm) fit easily in a pocket or laptop bag
  • Backward compatible with USB 2.0 for use with older computers
  • No driver installation required on most operating systems

👎 Cons

  • Supports only microSD cards, so full-size SD users need a separate reader
  • Limited to UHS-I speeds, which bottlenecks faster UHS-II cards
  • No built-in cap or cover to protect the USB connector during transport
  • Short fixed form factor offers no cable, which can block adjacent USB ports on some laptops

Frequently Asked Questions

No, this reader accepts only microSD cards. You would need a separate reader for full-size SD cards.
Yes, it is backward compatible with USB 2.0, though transfer speeds will be limited to USB 2.0 rates.
The reader supports UHS-I cards. UHS-II cards will work but will be limited to UHS-I transfer speeds.
No, the MobileMate reader is plug-and-play on most modern operating systems without additional drivers.

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