Introduction
This manual provides essential information for the proper use and care of your SanDisk Ultra MicroSDXC 128GB memory card. Please read these instructions carefully to ensure optimal performance and longevity of your product.
The SanDisk Ultra MicroSDXC card is designed for use in compatible devices such as smartphones, tablets, and cameras, offering reliable storage and fast data transfer speeds for Full HD video recording and high-resolution photos.
Setup and Installation
The SanDisk Ultra MicroSDXC card is compatible with devices that support microSDHC and microSDXC memory cards. An included SD adapter allows for compatibility with standard SD card slots.
Inserting the MicroSDXC Card
- Identify the Card Slot: Locate the microSD card slot on your device (smartphone, tablet, camera, etc.). Refer to your device's user manual for exact location and orientation.
- Orient the Card: Hold the SanDisk Ultra MicroSDXC card with the gold contacts facing down (or as indicated by your device) and the SanDisk logo facing up.
- Insert the Card: Gently slide the card into the slot until it clicks into place. Do not force the card. If it does not insert easily, recheck the orientation.
- Formatting (Optional): Some devices may prompt you to format the card upon first insertion. Formatting erases all data on the card and prepares it for use with your specific device. If prompted, follow the on-screen instructions.

Image: A close-up view of the SanDisk Ultra MicroSDXC 128GB memory card, showing its compact size and branding. This card is designed for easy insertion into compatible devices.
Using the SD Adapter
The included SD adapter allows you to use your microSDXC card in devices that accept standard SD cards, such as laptops, desktop computers, and some cameras.
- Insert MicroSDXC into Adapter: Slide the SanDisk Ultra MicroSDXC card into the designated slot on the side of the SD adapter until it clicks.
- Insert Adapter into Device: Insert the SD adapter (with the microSDXC card inside) into the SD card slot of your computer or compatible device.
- Access Data: Your computer or device should recognize the card as a removable storage drive, allowing you to transfer files.

Image: Retail packaging of the SanDisk Ultra MicroSDXC card, illustrating the card and its included SD adapter. The packaging highlights compatibility with smartphones and Full HD video recording.
Operation
Once installed, your SanDisk Ultra MicroSDXC card functions as an extension of your device's storage. Its Class 10 and UHS Speed Class 1 (U1) ratings ensure efficient performance for various tasks.
Data Storage and Transfer
- Saving Files: When using the card in a camera, smartphone, or tablet, files such as photos, videos, and documents will be saved directly to the card if it is set as the default storage location.
- Transfer Speeds: The card offers read speeds of up to 80MB/s, facilitating quick transfer of large files to a computer. Write speeds are rated at 10MB/s, suitable for continuous Full HD video recording.
- App Performance: With A1 performance class, the card is optimized for faster app loading and performance on compatible Android smartphones and tablets.
Full HD Video Recording
The SanDisk Ultra MicroSDXC card supports Full HD (1080p) video recording, making it suitable for capturing high-quality footage with compatible cameras and smartphones.
- Ensure your device's video recording settings are configured to save to the microSD card.
- For optimal video recording performance, ensure the card has sufficient free space.
Care and Maintenance
To ensure the longevity and reliability of your SanDisk Ultra MicroSDXC card, follow these care guidelines:
- Proper Handling: Always handle the card by its edges. Avoid touching the gold contact pins to prevent damage or data corruption.
- Eject Safely: Always safely eject the card from your device or computer before physically removing it. This prevents data loss or corruption.
- Storage: When not in use, store the card in its protective case or a secure environment to prevent physical damage, dust, or static electricity exposure.
- Cleaning: If necessary, gently wipe the gold contacts with a clean, dry, lint-free cloth. Do not use liquids or abrasive materials.
- Durability Features: The SanDisk Ultra MicroSDXC card is designed to be waterproof, temperature-proof, shock-proof, and X-ray-proof. However, extreme conditions should still be avoided to maximize lifespan.

Image: The reverse side of the SanDisk Ultra MicroSDXC card packaging, detailing its durability features including waterproof, temperature-proof, shock-proof, and X-ray-proof properties.
Troubleshooting
If you encounter issues with your SanDisk Ultra MicroSDXC card, consider the following common solutions:
- Card Not Detected:
- Ensure the card is fully and correctly inserted into the device or adapter.
- Restart your device.
- Test the card in another compatible device or with a different card reader to rule out a device-specific issue.
- Check if the card slot on your device is clean and free of debris.
- Slow Performance:
- Ensure your device supports the card's speed class.
- Free up space on the card. Performance can degrade when the card is nearly full.
- Avoid running multiple demanding applications simultaneously while accessing the card.
- Cannot Write/Delete Files:
- If using the SD adapter, ensure the write-protect switch on the side of the adapter is not in the "Lock" position.
- Check your device's settings for any write protection or permissions.
- The card may be corrupted. If data recovery is not critical, formatting the card might resolve the issue (this will erase all data).
- Data Corruption:
- Always safely eject the card before removal.
- Avoid exposing the card to extreme temperatures or strong magnetic fields.
- Regularly back up important data to another storage medium.
Specifications
| Model Name | SanDisk Ultra |
| Model Number | SDSQUNS-128G-GN6MN |
| Capacity | 128 GB |
| Flash Memory Type | MicroSDXC |
| Read Speed | Up to 80 MB/s |
| Write Speed | 10 MB/s (Minimum) |
| Speed Class | Class 10 |
| UHS Speed Class | U1 |
| A1 App Performance Class | Yes |
| Compatible Devices | Smartphones, Tablets, Cameras (microSDHC/microSDXC compatible) |
| Color | Grey, White |
| Dimensions (Card) | 0.59 x 0.43 x 0.04 inches (15mm x 11mm x 1mm) - Standard microSD dimensions |
| Weight | Approximately 0.388 ounces (11 grams) |
| Durability | Waterproof, Temperature-proof, Shock-proof, X-ray-proof |
Warranty Information
SanDisk Ultra MicroSDXC cards typically come with a limited warranty. Based on product packaging, this product includes a 10-year limited warranty.
For detailed warranty terms and conditions, including specific coverage and limitations, please refer to the official SanDisk warranty documentation available on their website or contact SanDisk customer support.
Proof of purchase may be required for warranty claims.
Support and Resources
For further assistance, product registration, or to access additional resources, please visit the official SanDisk support channels:
- Warranty Guide: www.sandisk.com/wug
- SanDisk Memory Zone App: For managing photos and videos, visit www.sandisk.com/memoryzone
- Official SanDisk Website: www.sandisk.com
- Customer Service: Refer to the SanDisk website for contact information specific to your region.





