1. Introduction
This manual provides essential information for the proper use and care of your SanDisk Ultra 128GB microSDXC UHS-I Card with Adapter (Model: SDSQUNC-128G-GN6MA). This memory card is designed to expand storage for compatible devices, enabling you to capture, store, and transfer high-quality photos and Full HD video.

Image 1.1: SanDisk Ultra 128GB microSDXC UHS-I Card with Adapter in its retail packaging.
2. What's Included
Your SanDisk Ultra 128GB microSDXC UHS-I Card package includes:
- One (1) SanDisk Ultra 128GB microSDXC UHS-I Card
- One (1) SD Adapter

Image 2.1: The SanDisk Ultra 128GB microSDXC UHS-I Card and its accompanying SD adapter.
3. Setup
3.1. Inserting the microSD Card into a Device
- Locate the microSD card slot on your compatible device (e.g., Android smartphone, tablet, camera). Refer to your device's manual for exact location.
- Orient the SanDisk Ultra microSDXC card with the gold contacts facing down and the label facing up (or as indicated by your device).
- Gently insert the card into the slot until it clicks into place. Do not force the card.
- Your device should recognize the new storage. You may need to format the card through your device's settings before first use.
3.2. Using the SD Adapter
The included SD adapter allows you to use your microSDXC card with devices that have a standard SD card slot (e.g., laptops, DSLR cameras, card readers).
- Insert the SanDisk Ultra microSDXC card into the designated slot on the side of the SD adapter until it clicks.
- Insert the assembled SD adapter into the SD card slot of your computer or compatible device.
- To remove, gently push the microSDXC card further into the adapter until it springs out, then pull it out.
Video 3.1: This video demonstrates the insertion of a SanDisk Ultra microSD card into a Nintendo Switch. While the video features a 200GB card, the physical insertion process is identical for the 128GB model.
4. Operating Instructions
4.1. Storing Data
Once installed and recognized by your device, the SanDisk Ultra 128GB microSDXC card functions as additional storage. You can save photos, videos, music, documents, and applications directly to the card, depending on your device's capabilities.
- Full HD Video: The card is Class 10 rated, ensuring sufficient speed for recording and playing back Full HD (1080p) video without interruption.
- Photos: Store a large volume of high-resolution photos.
- Applications: On Android devices, some applications can be moved to the microSD card to free up internal storage. Consult your device's settings for this option.
4.2. Data Transfer
The SanDisk Ultra microSDXC card offers transfer speeds of up to 80MB/s. This allows for quick movement of files between the card and other devices, such as a computer.
- To transfer files to a computer, use the included SD adapter with a computer's SD card slot or a compatible card reader.
- For optimal transfer speeds, ensure your device and card reader support UHS-I speeds.
4.3. SanDisk Memory Zone App
For Android users, the SanDisk Memory Zone app (available on the Google Play Store) can help you manage your media and memory. This app allows you to organize, back up, and transfer files between your device's internal memory and the SanDisk card, optimizing your phone's performance.
5. Maintenance and Care
5.1. Safety Information
DO NOT THROW AWAY
Retain this manual for future reference. The microSD card is a small electronic component and should be handled with care.
5.2. General Care
- Physical Protection: The SanDisk Ultra card is designed to be waterproof, shockproof, X-ray proof, and temperature resistant. However, avoid exposing it to extreme physical stress, bending, or excessive heat.
- Cleaning: If necessary, gently wipe the gold contacts with a soft, dry, lint-free cloth. Avoid using harsh chemicals or abrasive materials.
- Storage: When not in use, store the microSD card in its protective case or the SD adapter to prevent damage to the contacts.
- Eject Safely: Always safely eject the card from your device or computer before physically removing it to prevent data corruption.
6. Troubleshooting
6.1. Card Not Recognized
- Ensure the card is fully and correctly inserted into the device or adapter.
- Restart your device.
- Try the card in a different compatible device or card reader to determine if the issue is with the card or the original device.
- Check your device's settings to see if the card needs to be formatted. Formatting will erase all data on the card.
6.2. Slow Performance
- Ensure your device and card reader support UHS-I speeds for optimal performance.
- The card may be nearly full. Free up space by deleting unnecessary files or transferring them to another storage device.
- Some devices or applications may have slower write speeds, affecting overall performance.
6.3. Data Corruption
- Always safely eject the card from your device or computer before removing it.
- Avoid removing the card during data transfer or while the device is actively accessing it.
- If data corruption occurs frequently, consider backing up your data and reformatting the card. If issues persist, the card may be faulty.
7. Specifications
| Feature | Detail |
|---|---|
| Model Number | SDSQUNC-128G-GN6MA |
| Memory Storage Capacity | 128 GB |
| Flash Memory Type | Micro SDXC |
| Hardware Interface | microSDXC |
| Secure Digital Association Speed Class | Class 10 |
| Transfer Speed | Up to 80 MB/s |
| Compatible Devices | Smartphone, Tablet |
| Product Dimensions | 0.04 x 0.59 x 0.43 inches |
| Item Weight | 0.176 ounces |
| Color | Black |
| Special Features | Waterproof, Shockproof, X-ray proof, Temperature resistant |

Image 7.1: Back of the product packaging, detailing specifications and warranty information.
8. Warranty and Support
8.1. Limited Warranty
This SanDisk product is covered by 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 comprehensive warranty details, visit www.sandisk.com/wug.
8.2. Customer Support
For technical assistance, product inquiries, or support, please visit the official SanDisk support website or contact their customer service channels as provided on their website.





