SanDisk SDSQUNR-128G-GN3MA

SanDisk Ultra microSDXC UHS-I Card 128GB User Manual

Model: SDSQUNR-128G-GN3MA

Introduction

The SanDisk Ultra microSDXC UHS-I Card provides reliable storage for your digital devices. Designed for capturing and storing Full HD video and high-resolution photos, this memory card offers fast transfer speeds and robust durability.

This manual provides essential information on setting up, operating, maintaining, and troubleshooting your SanDisk Ultra microSDXC UHS-I Card.

Product Overview

SanDisk Ultra microSDXC UHS-I Card with Adapter in retail packaging

Front view of the SanDisk Ultra microSDXC UHS-I Card and its adapter, displayed in its retail packaging. The packaging highlights 128GB capacity, Full HD video support, and speeds up to 100 MB/s.

Back of SanDisk Ultra microSDXC UHS-I Card packaging showing specifications and certifications

Rear view of the SanDisk Ultra microSDXC UHS-I Card packaging, detailing product specifications, compatibility, and various certifications such as CE, FC, and EAC. It also mentions water, temperature, shock, and X-ray proof features.

The SanDisk Ultra microSDXC UHS-I Card is a high-capacity memory solution designed for a wide range of compatible devices. It comes with a standard SD adapter for broader compatibility.

Key Features:

  • Capacity: 128 GB
  • Speed Class: Class 10, UHS-I (U1)
  • Read Speed: Up to 100 MB/s
  • Write Speed: Up to 100 MB/s
  • Durability: Waterproof, temperature-proof, shock-proof, X-ray proof
  • Compatibility: Compatible with all microSDHC and microSDXC host devices. Includes SD adapter for use with full-size SD card slots.

Setup

Inserting the microSD Card:

  1. Identify the Slot: Locate the microSD card slot on your device (e.g., smartphone, tablet, camera, drone). Refer to your device's user manual for exact location.
  2. Orient the Card: Hold the SanDisk Ultra microSD card with the gold contacts facing down (or as indicated by your device) and the SanDisk logo facing up.
  3. Insert Gently: Carefully insert the card into the slot until it clicks into place. Do not force the card.
  4. Using the SD Adapter: If your device uses a full-size SD card slot, insert the microSD card into the provided SD adapter first, then insert the adapter into your device's SD card slot.
SanDisk Ultra microSDXC UHS-I Card and SD adapter

The SanDisk Ultra microSDXC UHS-I Card shown alongside its included SD adapter, illustrating how the smaller microSD card fits into the larger adapter for compatibility with various devices.

Formatting the Card (Optional but Recommended):

While many devices can use the card immediately, formatting the card within your device is recommended for optimal performance and compatibility. This will erase all data on the card, so back up any important files first.

  1. Access Device Settings: Navigate to the storage or memory settings menu on your device.
  2. Select Format Option: Find the option to "Format SD card" or "Erase SD card."
  3. Confirm: Follow the on-screen prompts to confirm the formatting process.

Operating the Memory Card

Storing Data:

Once inserted and recognized by your device, the SanDisk Ultra microSDXC card will function as an external storage medium. You can save photos, videos, documents, and other files directly to the card.

  • Cameras: Set your camera's storage destination to the memory card for photos and videos.
  • Smartphones/Tablets: Configure app settings to save media to the SD card, or manually move files using a file manager app.
  • Computers: Use the SD adapter to insert the card into your computer's SD card reader. The card will appear as a removable drive, allowing you to drag and drop files.

Transferring Data:

To transfer data from the card to another device (e.g., computer):

  1. Safely Remove: Always safely eject or unmount the memory card from your device before physically removing it to prevent data corruption.
  2. Insert into Reader: Insert the microSD card (with or without the adapter) into a compatible card reader connected to your computer.
  3. Copy Files: Open the card's drive on your computer and copy/paste or drag/drop files to your desired location.

Maintenance

  • Regular Backups: Periodically back up important data from your memory card to a computer or cloud storage to prevent data loss.
  • Safe Removal: Always use the "Safely Remove Hardware" option on computers or the "Unmount SD card" option on mobile devices before removing the card.
  • Keep Contacts Clean: If necessary, gently clean the gold contacts on the card with a soft, dry, lint-free cloth. Avoid touching the contacts directly with your fingers.
  • Storage: Store the card in its protective case or a secure location when not in use to prevent physical damage.
  • Avoid Extreme Conditions: While durable, avoid exposing the card to extreme temperatures, strong magnetic fields, or harsh chemicals.

Troubleshooting

ProblemPossible CauseSolution
Card not recognized by device.Incorrect insertion, dirty contacts, incompatible device, or card corruption.
  • Re-insert the card correctly.
  • Clean card contacts.
  • Verify device compatibility (microSDHC/microSDXC support).
  • Try the card in another compatible device.
Slow read/write speeds.Device limitations, fragmented data, or card nearing full capacity.
  • Ensure your device supports UHS-I speeds.
  • Transfer some data off the card to free up space.
  • Format the card (after backing up data).
Cannot write or delete files.Card is write-protected (if using SD adapter), or card is full/corrupted.
  • Check the write-protect switch on the SD adapter (slide it up).
  • Delete unnecessary files to free space.
  • Format the card (after backing up data).

Specifications

Model NumberSDSQUNR-128G-GN3MA
Capacity128 GB
Speed ClassClass 10, UHS-I (U1)
Read SpeedUp to 100 MB/s
Write SpeedUp to 100 MB/s
Dimensions (microSD)15mm x 11mm x 1mm (approx.)
Product Dimensions (packaged)32mm (P) x 24mm (L) x 2mm (A)
Weight1 Gram
DurabilityWaterproof, Temperature-proof, Shock-proof, X-ray proof
Compatible DevicesCell phones, Smartphones, Cameras, Computers, Tablets, Drones, etc.
Hardware InterfacemicroSDXC
UPC619659185510

Warranty and Support

Limited Warranty:

This SanDisk product comes with a limited warranty. For detailed information regarding the terms and conditions of your warranty, including duration and coverage, please refer to the official SanDisk website.

Warranty Guide: For the most current warranty information, please visit www.sandisk.com/wug.

Customer Support:

For technical assistance, product inquiries, or support, please visit the official SanDisk support page or contact their customer service. Contact information and support resources can typically be found on the SanDisk website.

SanDisk Support: www.sandisk.com/support

© 2025 SanDisk. All rights reserved.

SanDisk and SanDisk Ultra are trademarks of Western Digital Corporation or its affiliates.

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