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A PCIe 3.1 NVMe interface and a standard microSD UHS-I interface make this card compatible with today’s devices and primed for future superspeed products.
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Prepare your storage for the next generation of performance with the SanDisk microSD Express Card. Featuring a PCIe-NVMe interface, this card is ready for future superspeed products while remaining compatible with current UHS-I devices. Experience exponentially faster transfer rates for massive time savings when handling large files.
Key Features & BenefitsThis storage solution is designed for use with Cameras, Personal Computers, and Tablets.
| Brand | SanDisk |
| Storage Capacity | 512 GB |
| Read Speed | Up to 880 Megabytes Per Second |
| Write Speed (Max) | Up to 650MB/s (Based on legal disclaimers) |
| Minimum Sustained Write Speed | 220MB/s |
| Flash Memory Type | Micro SD |
| Hardware Connectivity | microSDXC |
| Speed Class | Class 10 |
| Dimensions (L x W x H) | 15mm x 11mm x 1mm |
| Weight | 0.26 Grams |
| Color | Black |
| Model | SDSQXFN-512G-GN4NN |
Leverage proprietary Flash Management Techniques from SanDisk, a leader in microSD card development, to ensure highly stable memory storage for your critical content.
A PCIe 3.1 NVMe interface and a standard microSD UHS-I interface make this card compatible with today’s devices and primed for future superspeed products.

Up to 8.8 times faster read speeds than our standard microSD UHS-I card(8). 128GB(13) microSD Express cards deliver up to 880MB/s(1) read speeds and up to 480MB/s(1) write when used with SanDisk PRO-READER SD Express Dual Card (sold separately).

A Massive Time-Saver
Saves you up to 2.8 minutes transferring 60 minutes of 4K UHD video(4) shot at 30 fps and up to 2.9 minutes transferring 2,000 10MP RAW photos.(9)
Durability You Can Count On
This card is waterproof, temperature-proof, humidity-proof, drop-proof, shock-proof, magnetic-proof, x-ray proof, and wear-out proof.(5)(1) [512GB] Up to 880MB/s read speeds. Up to 650MB/s write speeds. 220MB/s minimum sustained write speed. Based on internal testing; performance may be lower depending upon host device, interface, usage conditions and other factors. 1MB=1,000,000 bytes. (2) Based on internal testing with the SanDisk PRO-READER SD Express Dual Card against the 64GB-128GB SanDisk Extreme PRO UHS-II SD cards with SanDisk Extreme PRO SD UHS-II Card USB-C Reader/Writer. (3) Based on internal testing with the SanDisk PRO-READER SD Express Dual Card against the 1TB-2TB SanDisk Portable SSD. (4) Compatible device required. Full HD (1920 x 1080), 4K (4096x2160), 4K UHD (3840x2160) and 5.3K (5312x2988) video support may vary based upon host device, file attributes and other factors. See official SanDisk website for details. (5) Card only. See product packaging or official SanDisk website for additional information and limitations. (6) Registration required. Terms and conditions apply. (8) Based on internal testing with the SanDisk PRO-READER SD Express Dual Card against the 256GB SanDisk Ultra Lite UHS-I microSDXC card. Performance may be lower depending upon host device, interface, usage conditions and other factors. (9) Based on internal testing with the SanDisk PRO-READER SD Express Dual Card against the 128GB-256GB SanDisk Extreme PRO UHS-I microSDXC card with SanDisk Professional PRO-READER SD & microSD. Performance may be lower depending upon host device, interface, usage conditions and other factors. (10) See Western Digital White Paper- Flash 101 and Flash Management. A detailed overview of flash and flash management (August 2018). (11) See Flash Memory Summit, 2023 Flash Memory Timeline (2023). (12) Based on stated speeds. Based on internal testing; performance may be lower depending upon host device, interface, usage conditions and other factors. 1MB=1,000,000 bytes. (13) 1GB=1,000,000,000 bytes. Actual user storage less. (14) Based on internal testing with 128GB-512GB SanDisk microSD express cards (sold separately); performance may be lower depending upon host device, usage conditions, and other factors. 1MB = 1,000,000 bytes.
Sandisk, the Sandisk logos and SanDisk Extreme are registered trademarks or trademarks of SanDisk Corporation or its affiliates in the US and/or other countries. All other marks are the property of their respective owners. Product specifications subject to change without notice. Pictures shown may vary from actual products.
2025 Sandisk Corporation or its affiliates. All rights reserved.
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