SanDisk 128GB Extreme microSD UHS I Card for 4K Video on Smartphones, Action Cams & Drones
Quick take
This SanDisk Extreme microSDXC card is designed for creators who want reliable 4K recording with fast offloads and smoother smartphone app performance. With UHS-I speeds up to 190MB/s read, V30 and U3 ratings for video, and A27 for apps, it fits action cams, drones, and high-end Android devices. The main caveat: real-world performance depends on your device and any adapter you use, and the card is tuned for UHS-I (not the fastest “UHS-II” options).
Pros and cons
Pros
- Video-ready performance ratings, including UHS Speed Class 3 (U3) and Video Speed Class 30 (V30).
- Fast read speeds up to 190MB/s for quicker media offloads.
- Good for high-demand use cases like 4K recording in action cams, drones, and compatible smartphones.
- Rated for faster application performance (A27) when used in an A2-compatible device.
Cons
- Speed is only as good as the host device and your card reader (plus adapters, if you use them).
- 128GB capacity is great for many trips and recordings, but heavy 4K shooters may prefer higher capacities.
- Most spec-heavy benefits depend on using the right device profile (U3/V30 and A2/A27 support).
What buyers think
Buyer review evidence for this card points strongly toward fast, dependable day-to-day performance. Multiple users mention it handling 4K workflows without lag, issues, or data loss, including use in demanding devices like drones and cameras. Several also describe the card as well-built and reliable for long sessions, and one recurring theme is that the purchase is good value for the performance and capacity. There is also at least some practical guidance in reviews that adapter quality can matter, since a slower or failing adapter can limit throughput even if the card itself is fast.
Key specs that matter for 4K video and fast transfers
This is a microSDXC (UHS-I) card marketed for high-bitrate capture and quicker media offloading. Here are the spec areas that typically decide whether a card is a good match for 4K recorders and smartphones.
Read and write performance
The card is rated for read speeds up to 190MB/s, with write speeds up to 130MB/s. Those write figures are the ones you want to pay attention to for uninterrupted recording, while the read speed helps when you move footage to a computer or tablet.
Video speed class and UHS speed class
For video reliability, it carries UHS Speed Class 3 (U3) and Video Speed Class 30 (V30). In practical terms, these ratings indicate the card is intended to sustain the minimum write performance needed for smoother 4K and Full HD recording, reducing the risk of dropped frames caused by a card that cannot keep up.
App performance rating (A27)
For Android devices that support the microSD application performance class, this card is rated A27. That matters if you install apps to the card and want faster launch and responsiveness compared with slower, non-app-performance cards.
Capacity and format
At 128GB, you get a solid balance of space for 4K clips, burst photos, and travel videos. It uses microSDXC, so it’s built for devices that support microSDXC compatibility.
Pros and cons, in plain terms
Who it’s best for
- Drone, action cam, and camera users who need a card with V30/U3-style video performance for 4K recording.
- High-end Android smartphone owners who want faster storage behavior and potential A27 app performance when supported.
- Creators who transfer footage often and benefit from higher read speeds when offloading media.
Who should consider a different card
- Buyers chasing absolute fastest transfers for the newest UHS-II workflows, since this is UHS-I.
- Very high-volume 4K shooters who routinely fill 128GB quickly and may want larger capacities to reduce card swaps.
- Anyone using a questionable adapter or reader, where device bottlenecks can flatten performance.
Reliability and durability for outdoor use
SanDisk positions the Extreme line for rugged conditions. The card is described as shockproof, temperature-proof, waterproof, and X-ray-proof, which is useful for people who record outdoors or take a card with them on trips. As with any microSD card, best results still come from using it within the temperature and compatibility limits of your device.
How to get the best performance (so you do not waste the card)
- Use a compatible device that supports microSDXC and the relevant speed modes (for video, that includes U3/V30-class behavior).
- Choose a quality card reader for offloads. If you rely on an adapter, the adapter can be the bottleneck.
- Back up important footage like you would with any storage card, especially after long shoots.
Verdict
The SanDisk 128GB Extreme microSDXC UHS-I card is a strong all-around pick for 4K video recording and faster file transfers, with video-focused speed ratings (U3, V30) and A27 app performance for supported Android devices. It seems especially well-suited to drone and action cam setups where reliability matters. If you are on the edge of your 128GB capacity or you need maximum transfer speeds beyond UHS-I, you may want to look at higher capacity or higher-tier options, but for most 4K shooters who want dependable performance, this one is easy to justify.
Price and availability
Availability can change quickly. If you want the latest price and stock status, check the link below.
FAQ
Common questions
Is this microSD card good for 4K video? It is built for video reliability with UHS Speed Class 3 (U3) and Video Speed Class 30 (V30), and it is marketed for 4K UHD recording. What are the read and write speeds? It is rated for up to 190MB/s read and up to 130MB/s write, with performance depending on your device and any reader or adapter used. Will it improve app performance on my phone? If your Android device supports application performance for microSD cards, this model is rated A27, which is intended to support faster app behavior than standard cards. Is it microSDXC or microSDHC? It is microSDXC (128GB). Does adapter or card reader quality affect speed? Yes. Even a fast card can be limited by a slower reader, and some users note that adapters can affect performance. For best results, use a quality reader that matches your needs.Specifications
| Product Title | SanDisk 128GB Extreme microSD UHS I Card for 4K Video on Smartphones, Action Cams & Drones 190MB/s Read, 90MB/s Write SDSQXAA 128G GN6MN, Red/Gold |
|---|---|
| Category | Electronics > Computers & Accessories > Computer Accessories & Peripherals > Memory Cards > Micro SD Cards |
| Brand | Sandisk |
| Manufacturer | Western Digital |
| Model Name | Extreme |
| Model Number | SDSQXAA-128G-GN6MN |
| Item Weight | 5 Grams |
| Color | Red/Gold |
| Flash Memory Type | Micro SD |
| Memory Storage Capacity | 128 GB |
| Compatible Devices | Camera, Personal Computer |
| Additional Features | Portable |
| Read Speed | 190 Megabytes Per Second |
| Media Speed | 90 MB per second |
| Hardware Connectivity | microSDXC |
| Secure Digital Association Speed Class | Class 10 |
| Flash Memory Video Speed Class | V30 |
| Item Dimensions L x W | 0.04"L x 0.59"W |
| Warranty Type | Limited |
| UPC | 619659188467 |
| Global Trade Identification Number | 00619659188467 |
| Mfr Part Number | SDSQXAA-128G-GN6MN |
| Unit Count | 1.0 Count |
Available variants
Capacity
- 128GB
- 256GB
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